Loading...
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_GETLK64:
207 case F_SETLK64:
208 case F_SETLKW64:
209 if (copy_from_user(&user, (struct oabi_flock64 __user *)arg,
210 sizeof(user)))
211 return -EFAULT;
212 kernel.l_type = user.l_type;
213 kernel.l_whence = user.l_whence;
214 kernel.l_start = user.l_start;
215 kernel.l_len = user.l_len;
216 kernel.l_pid = user.l_pid;
217 local_arg = (unsigned long)&kernel;
218 fs = get_fs();
219 set_fs(KERNEL_DS);
220 }
221
222 ret = sys_fcntl64(fd, cmd, local_arg);
223
224 switch (cmd) {
225 case F_GETLK64:
226 if (!ret) {
227 user.l_type = kernel.l_type;
228 user.l_whence = kernel.l_whence;
229 user.l_start = kernel.l_start;
230 user.l_len = kernel.l_len;
231 user.l_pid = kernel.l_pid;
232 if (copy_to_user((struct oabi_flock64 __user *)arg,
233 &user, sizeof(user)))
234 ret = -EFAULT;
235 }
236 case F_SETLK64:
237 case F_SETLKW64:
238 set_fs(fs);
239 }
240
241 return ret;
242}
243
244struct oabi_epoll_event {
245 __u32 events;
246 __u64 data;
247} __attribute__ ((packed,aligned(4)));
248
249asmlinkage long sys_oabi_epoll_ctl(int epfd, int op, int fd,
250 struct oabi_epoll_event __user *event)
251{
252 struct oabi_epoll_event user;
253 struct epoll_event kernel;
254 mm_segment_t fs;
255 long ret;
256
257 if (op == EPOLL_CTL_DEL)
258 return sys_epoll_ctl(epfd, op, fd, NULL);
259 if (copy_from_user(&user, event, sizeof(user)))
260 return -EFAULT;
261 kernel.events = user.events;
262 kernel.data = user.data;
263 fs = get_fs();
264 set_fs(KERNEL_DS);
265 ret = sys_epoll_ctl(epfd, op, fd, &kernel);
266 set_fs(fs);
267 return ret;
268}
269
270asmlinkage long sys_oabi_epoll_wait(int epfd,
271 struct oabi_epoll_event __user *events,
272 int maxevents, int timeout)
273{
274 struct epoll_event *kbuf;
275 mm_segment_t fs;
276 long ret, err, i;
277
278 if (maxevents <= 0 || maxevents > (INT_MAX/sizeof(struct epoll_event)))
279 return -EINVAL;
280 kbuf = kmalloc(sizeof(*kbuf) * maxevents, GFP_KERNEL);
281 if (!kbuf)
282 return -ENOMEM;
283 fs = get_fs();
284 set_fs(KERNEL_DS);
285 ret = sys_epoll_wait(epfd, kbuf, maxevents, timeout);
286 set_fs(fs);
287 err = 0;
288 for (i = 0; i < ret; i++) {
289 __put_user_error(kbuf[i].events, &events->events, err);
290 __put_user_error(kbuf[i].data, &events->data, err);
291 events++;
292 }
293 kfree(kbuf);
294 return err ? -EFAULT : ret;
295}
296
297struct oabi_sembuf {
298 unsigned short sem_num;
299 short sem_op;
300 short sem_flg;
301 unsigned short __pad;
302};
303
304asmlinkage long sys_oabi_semtimedop(int semid,
305 struct oabi_sembuf __user *tsops,
306 unsigned nsops,
307 const struct timespec __user *timeout)
308{
309 struct sembuf *sops;
310 struct timespec local_timeout;
311 long err;
312 int i;
313
314 if (nsops < 1 || nsops > SEMOPM)
315 return -EINVAL;
316 sops = kmalloc(sizeof(*sops) * nsops, GFP_KERNEL);
317 if (!sops)
318 return -ENOMEM;
319 err = 0;
320 for (i = 0; i < nsops; i++) {
321 __get_user_error(sops[i].sem_num, &tsops->sem_num, err);
322 __get_user_error(sops[i].sem_op, &tsops->sem_op, err);
323 __get_user_error(sops[i].sem_flg, &tsops->sem_flg, err);
324 tsops++;
325 }
326 if (timeout) {
327 /* copy this as well before changing domain protection */
328 err |= copy_from_user(&local_timeout, timeout, sizeof(*timeout));
329 timeout = &local_timeout;
330 }
331 if (err) {
332 err = -EFAULT;
333 } else {
334 mm_segment_t fs = get_fs();
335 set_fs(KERNEL_DS);
336 err = sys_semtimedop(semid, sops, nsops, timeout);
337 set_fs(fs);
338 }
339 kfree(sops);
340 return err;
341}
342
343asmlinkage long sys_oabi_semop(int semid, struct oabi_sembuf __user *tsops,
344 unsigned nsops)
345{
346 return sys_oabi_semtimedop(semid, tsops, nsops, NULL);
347}
348
349asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
350 void __user *ptr, long fifth)
351{
352 switch (call & 0xffff) {
353 case SEMOP:
354 return sys_oabi_semtimedop(first,
355 (struct oabi_sembuf __user *)ptr,
356 second, NULL);
357 case SEMTIMEDOP:
358 return sys_oabi_semtimedop(first,
359 (struct oabi_sembuf __user *)ptr,
360 second,
361 (const struct timespec __user *)fifth);
362 default:
363 return sys_ipc(call, first, second, third, ptr, fifth);
364 }
365}
366
367asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
368{
369 sa_family_t sa_family;
370 if (addrlen == 112 &&
371 get_user(sa_family, &addr->sa_family) == 0 &&
372 sa_family == AF_UNIX)
373 addrlen = 110;
374 return sys_bind(fd, addr, addrlen);
375}
376
377asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
378{
379 sa_family_t sa_family;
380 if (addrlen == 112 &&
381 get_user(sa_family, &addr->sa_family) == 0 &&
382 sa_family == AF_UNIX)
383 addrlen = 110;
384 return sys_connect(fd, addr, addrlen);
385}
386
387asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
388 size_t len, unsigned flags,
389 struct sockaddr __user *addr,
390 int addrlen)
391{
392 sa_family_t sa_family;
393 if (addrlen == 112 &&
394 get_user(sa_family, &addr->sa_family) == 0 &&
395 sa_family == AF_UNIX)
396 addrlen = 110;
397 return sys_sendto(fd, buff, len, flags, addr, addrlen);
398}
399
400asmlinkage long sys_oabi_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
401{
402 struct sockaddr __user *addr;
403 int msg_namelen;
404 sa_family_t sa_family;
405 if (msg &&
406 get_user(msg_namelen, &msg->msg_namelen) == 0 &&
407 msg_namelen == 112 &&
408 get_user(addr, &msg->msg_name) == 0 &&
409 get_user(sa_family, &addr->sa_family) == 0 &&
410 sa_family == AF_UNIX)
411 {
412 /*
413 * HACK ALERT: there is a limit to how much backward bending
414 * we should do for what is actually a transitional
415 * compatibility layer. This already has known flaws with
416 * a few ioctls that we don't intend to fix. Therefore
417 * consider this blatent hack as another one... and take care
418 * to run for cover. In most cases it will "just work fine".
419 * If it doesn't, well, tough.
420 */
421 put_user(110, &msg->msg_namelen);
422 }
423 return sys_sendmsg(fd, msg, flags);
424}
425
426asmlinkage long sys_oabi_socketcall(int call, unsigned long __user *args)
427{
428 unsigned long r = -EFAULT, a[6];
429
430 switch (call) {
431 case SYS_BIND:
432 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
433 r = sys_oabi_bind(a[0], (struct sockaddr __user *)a[1], a[2]);
434 break;
435 case SYS_CONNECT:
436 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
437 r = sys_oabi_connect(a[0], (struct sockaddr __user *)a[1], a[2]);
438 break;
439 case SYS_SENDTO:
440 if (copy_from_user(a, args, 6 * sizeof(long)) == 0)
441 r = sys_oabi_sendto(a[0], (void __user *)a[1], a[2], a[3],
442 (struct sockaddr __user *)a[4], a[5]);
443 break;
444 case SYS_SENDMSG:
445 if (copy_from_user(a, args, 3 * sizeof(long)) == 0)
446 r = sys_oabi_sendmsg(a[0], (struct msghdr __user *)a[1], a[2]);
447 break;
448 default:
449 r = sys_socketcall(call, args);
450 }
451
452 return r;
453}
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}