Version:  2.0.40 2.2.26 2.4.37 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 4.10

Linux/ipc/compat.c

  1 /*
  2  * 32 bit compatibility code for System V IPC
  3  *
  4  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  5  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
  6  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
  7  * Copyright (C) 2000           VA Linux Co
  8  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
  9  * Copyright (C) 2000           Hewlett-Packard Co.
 10  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
 11  * Copyright (C) 2000           Gerhard Tonn (ton@de.ibm.com)
 12  * Copyright (C) 2000-2002      Andi Kleen, SuSE Labs (x86-64 port)
 13  * Copyright (C) 2000           Silicon Graphics, Inc.
 14  * Copyright (C) 2001           IBM
 15  * Copyright (C) 2004           IBM Deutschland Entwicklung GmbH, IBM Corporation
 16  * Copyright (C) 2004           Arnd Bergmann (arnd@arndb.de)
 17  *
 18  * This code is collected from the versions for sparc64, mips64, s390x, ia64,
 19  * ppc64 and x86_64, all of which are based on the original sparc64 version
 20  * by Jakub Jelinek.
 21  *
 22  */
 23 #include <linux/compat.h>
 24 #include <linux/errno.h>
 25 #include <linux/highuid.h>
 26 #include <linux/init.h>
 27 #include <linux/msg.h>
 28 #include <linux/shm.h>
 29 #include <linux/syscalls.h>
 30 #include <linux/ptrace.h>
 31 
 32 #include <linux/mutex.h>
 33 #include <linux/uaccess.h>
 34 
 35 #include "util.h"
 36 
 37 struct compat_msgbuf {
 38         compat_long_t mtype;
 39         char mtext[1];
 40 };
 41 
 42 struct compat_ipc_perm {
 43         key_t key;
 44         __compat_uid_t uid;
 45         __compat_gid_t gid;
 46         __compat_uid_t cuid;
 47         __compat_gid_t cgid;
 48         compat_mode_t mode;
 49         unsigned short seq;
 50 };
 51 
 52 struct compat_semid_ds {
 53         struct compat_ipc_perm sem_perm;
 54         compat_time_t sem_otime;
 55         compat_time_t sem_ctime;
 56         compat_uptr_t sem_base;
 57         compat_uptr_t sem_pending;
 58         compat_uptr_t sem_pending_last;
 59         compat_uptr_t undo;
 60         unsigned short sem_nsems;
 61 };
 62 
 63 struct compat_msqid_ds {
 64         struct compat_ipc_perm msg_perm;
 65         compat_uptr_t msg_first;
 66         compat_uptr_t msg_last;
 67         compat_time_t msg_stime;
 68         compat_time_t msg_rtime;
 69         compat_time_t msg_ctime;
 70         compat_ulong_t msg_lcbytes;
 71         compat_ulong_t msg_lqbytes;
 72         unsigned short msg_cbytes;
 73         unsigned short msg_qnum;
 74         unsigned short msg_qbytes;
 75         compat_ipc_pid_t msg_lspid;
 76         compat_ipc_pid_t msg_lrpid;
 77 };
 78 
 79 struct compat_shmid_ds {
 80         struct compat_ipc_perm shm_perm;
 81         int shm_segsz;
 82         compat_time_t shm_atime;
 83         compat_time_t shm_dtime;
 84         compat_time_t shm_ctime;
 85         compat_ipc_pid_t shm_cpid;
 86         compat_ipc_pid_t shm_lpid;
 87         unsigned short shm_nattch;
 88         unsigned short shm_unused;
 89         compat_uptr_t shm_unused2;
 90         compat_uptr_t shm_unused3;
 91 };
 92 
 93 struct compat_ipc_kludge {
 94         compat_uptr_t msgp;
 95         compat_long_t msgtyp;
 96 };
 97 
 98 struct compat_shminfo64 {
 99         compat_ulong_t shmmax;
100         compat_ulong_t shmmin;
101         compat_ulong_t shmmni;
102         compat_ulong_t shmseg;
103         compat_ulong_t shmall;
104         compat_ulong_t __unused1;
105         compat_ulong_t __unused2;
106         compat_ulong_t __unused3;
107         compat_ulong_t __unused4;
108 };
109 
110 struct compat_shm_info {
111         compat_int_t used_ids;
112         compat_ulong_t shm_tot, shm_rss, shm_swp;
113         compat_ulong_t swap_attempts, swap_successes;
114 };
115 
116 static inline int compat_ipc_parse_version(int *cmd)
117 {
118 #ifdef  CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
119         int version = *cmd & IPC_64;
120 
121         /* this is tricky: architectures that have support for the old
122          * ipc structures in 64 bit binaries need to have IPC_64 set
123          * in cmd, the others need to have it cleared */
124 #ifndef ipc_parse_version
125         *cmd |= IPC_64;
126 #else
127         *cmd &= ~IPC_64;
128 #endif
129         return version;
130 #else
131         /* With the asm-generic APIs, we always use the 64-bit versions. */
132         return IPC_64;
133 #endif
134 }
135 
136 static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
137                                           struct compat_ipc64_perm __user *up64)
138 {
139         int err;
140 
141         err  = __get_user(p64->uid, &up64->uid);
142         err |= __get_user(p64->gid, &up64->gid);
143         err |= __get_user(p64->mode, &up64->mode);
144         return err;
145 }
146 
147 static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
148                                         struct compat_ipc_perm __user *up)
149 {
150         int err;
151 
152         err  = __get_user(p->uid, &up->uid);
153         err |= __get_user(p->gid, &up->gid);
154         err |= __get_user(p->mode, &up->mode);
155         return err;
156 }
157 
158 static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
159                                           struct compat_ipc64_perm __user *up64)
160 {
161         int err;
162 
163         err  = __put_user(p64->key, &up64->key);
164         err |= __put_user(p64->uid, &up64->uid);
165         err |= __put_user(p64->gid, &up64->gid);
166         err |= __put_user(p64->cuid, &up64->cuid);
167         err |= __put_user(p64->cgid, &up64->cgid);
168         err |= __put_user(p64->mode, &up64->mode);
169         err |= __put_user(p64->seq, &up64->seq);
170         return err;
171 }
172 
173 static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
174                                         struct compat_ipc_perm __user *uip)
175 {
176         int err;
177         __compat_uid_t u;
178         __compat_gid_t g;
179 
180         err  = __put_user(p->key, &uip->key);
181         SET_UID(u, p->uid);
182         err |= __put_user(u, &uip->uid);
183         SET_GID(g, p->gid);
184         err |= __put_user(g, &uip->gid);
185         SET_UID(u, p->cuid);
186         err |= __put_user(u, &uip->cuid);
187         SET_GID(g, p->cgid);
188         err |= __put_user(g, &uip->cgid);
189         err |= __put_user(p->mode, &uip->mode);
190         err |= __put_user(p->seq, &uip->seq);
191         return err;
192 }
193 
194 static inline int get_compat_semid64_ds(struct semid64_ds *sem64,
195                                         struct compat_semid64_ds __user *up64)
196 {
197         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
198                 return -EFAULT;
199         return __get_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm);
200 }
201 
202 static inline int get_compat_semid_ds(struct semid64_ds *s,
203                                       struct compat_semid_ds __user *up)
204 {
205         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
206                 return -EFAULT;
207         return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
208 }
209 
210 static inline int put_compat_semid64_ds(struct semid64_ds *sem64,
211                                         struct compat_semid64_ds __user *up64)
212 {
213         int err;
214 
215         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
216                 return -EFAULT;
217         err  = __put_compat_ipc64_perm(&sem64->sem_perm, &up64->sem_perm);
218         err |= __put_user(sem64->sem_otime, &up64->sem_otime);
219         err |= __put_user(sem64->sem_ctime, &up64->sem_ctime);
220         err |= __put_user(sem64->sem_nsems, &up64->sem_nsems);
221         return err;
222 }
223 
224 static inline int put_compat_semid_ds(struct semid64_ds *s,
225                                       struct compat_semid_ds __user *up)
226 {
227         int err;
228 
229         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
230                 return -EFAULT;
231         err  = __put_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
232         err |= __put_user(s->sem_otime, &up->sem_otime);
233         err |= __put_user(s->sem_ctime, &up->sem_ctime);
234         err |= __put_user(s->sem_nsems, &up->sem_nsems);
235         return err;
236 }
237 
238 static long do_compat_semctl(int first, int second, int third, u32 pad)
239 {
240         unsigned long fourth;
241         int err, err2;
242         struct semid64_ds sem64;
243         struct semid64_ds __user *up64;
244         int version = compat_ipc_parse_version(&third);
245 
246         memset(&sem64, 0, sizeof(sem64));
247 
248         if ((third & (~IPC_64)) == SETVAL)
249 #ifdef __BIG_ENDIAN
250                 fourth = (unsigned long)pad << 32;
251 #else
252                 fourth = pad;
253 #endif
254         else
255                 fourth = (unsigned long)compat_ptr(pad);
256         switch (third & (~IPC_64)) {
257         case IPC_INFO:
258         case IPC_RMID:
259         case SEM_INFO:
260         case GETVAL:
261         case GETPID:
262         case GETNCNT:
263         case GETZCNT:
264         case GETALL:
265         case SETVAL:
266         case SETALL:
267                 err = sys_semctl(first, second, third, fourth);
268                 break;
269 
270         case IPC_STAT:
271         case SEM_STAT:
272                 up64 = compat_alloc_user_space(sizeof(sem64));
273                 fourth = (unsigned long)up64;
274                 err = sys_semctl(first, second, third, fourth);
275                 if (err < 0)
276                         break;
277                 if (copy_from_user(&sem64, up64, sizeof(sem64)))
278                         err2 = -EFAULT;
279                 else if (version == IPC_64)
280                         err2 = put_compat_semid64_ds(&sem64, compat_ptr(pad));
281                 else
282                         err2 = put_compat_semid_ds(&sem64, compat_ptr(pad));
283                 if (err2)
284                         err = -EFAULT;
285                 break;
286 
287         case IPC_SET:
288                 if (version == IPC_64)
289                         err = get_compat_semid64_ds(&sem64, compat_ptr(pad));
290                 else
291                         err = get_compat_semid_ds(&sem64, compat_ptr(pad));
292 
293                 up64 = compat_alloc_user_space(sizeof(sem64));
294                 if (copy_to_user(up64, &sem64, sizeof(sem64)))
295                         err = -EFAULT;
296                 if (err)
297                         break;
298 
299                 fourth = (unsigned long)up64;
300                 err = sys_semctl(first, second, third, fourth);
301                 break;
302 
303         default:
304                 err = -EINVAL;
305                 break;
306         }
307         return err;
308 }
309 
310 static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
311 {
312         struct compat_msgbuf __user *msgp = dest;
313         size_t msgsz;
314 
315         if (put_user(msg->m_type, &msgp->mtype))
316                 return -EFAULT;
317 
318         msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
319         if (store_msg(msgp->mtext, msg, msgsz))
320                 return -EFAULT;
321         return msgsz;
322 }
323 
324 #ifndef COMPAT_SHMLBA
325 #define COMPAT_SHMLBA   SHMLBA
326 #endif
327 
328 #ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
329 COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
330         u32, third, compat_uptr_t, ptr, u32, fifth)
331 {
332         int version;
333         u32 pad;
334 
335         version = call >> 16; /* hack for backward compatibility */
336         call &= 0xffff;
337 
338         switch (call) {
339         case SEMOP:
340                 /* struct sembuf is the same on 32 and 64bit :)) */
341                 return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
342         case SEMTIMEDOP:
343                 return compat_sys_semtimedop(first, compat_ptr(ptr), second,
344                                                 compat_ptr(fifth));
345         case SEMGET:
346                 return sys_semget(first, second, third);
347         case SEMCTL:
348                 if (!ptr)
349                         return -EINVAL;
350                 if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
351                         return -EFAULT;
352                 return do_compat_semctl(first, second, third, pad);
353 
354         case MSGSND: {
355                 struct compat_msgbuf __user *up = compat_ptr(ptr);
356                 compat_long_t type;
357 
358                 if (first < 0 || second < 0)
359                         return -EINVAL;
360 
361                 if (get_user(type, &up->mtype))
362                         return -EFAULT;
363 
364                 return do_msgsnd(first, type, up->mtext, second, third);
365         }
366         case MSGRCV: {
367                 void __user *uptr = compat_ptr(ptr);
368 
369                 if (first < 0 || second < 0)
370                         return -EINVAL;
371 
372                 if (!version) {
373                         struct compat_ipc_kludge ipck;
374                         if (!uptr)
375                                 return -EINVAL;
376                         if (copy_from_user(&ipck, uptr, sizeof(ipck)))
377                                 return -EFAULT;
378                         uptr = compat_ptr(ipck.msgp);
379                         fifth = ipck.msgtyp;
380                 }
381                 return do_msgrcv(first, uptr, second, (s32)fifth, third,
382                                  compat_do_msg_fill);
383         }
384         case MSGGET:
385                 return sys_msgget(first, second);
386         case MSGCTL:
387                 return compat_sys_msgctl(first, second, compat_ptr(ptr));
388 
389         case SHMAT: {
390                 int err;
391                 unsigned long raddr;
392 
393                 if (version == 1)
394                         return -EINVAL;
395                 err = do_shmat(first, compat_ptr(ptr), second, &raddr,
396                                COMPAT_SHMLBA);
397                 if (err < 0)
398                         return err;
399                 return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
400         }
401         case SHMDT:
402                 return sys_shmdt(compat_ptr(ptr));
403         case SHMGET:
404                 return sys_shmget(first, (unsigned)second, third);
405         case SHMCTL:
406                 return compat_sys_shmctl(first, second, compat_ptr(ptr));
407         }
408 
409         return -ENOSYS;
410 }
411 #endif
412 
413 COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
414 {
415         return do_compat_semctl(semid, semnum, cmd, arg);
416 }
417 
418 COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
419                        compat_ssize_t, msgsz, int, msgflg)
420 {
421         struct compat_msgbuf __user *up = compat_ptr(msgp);
422         compat_long_t mtype;
423 
424         if (get_user(mtype, &up->mtype))
425                 return -EFAULT;
426         return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
427 }
428 
429 COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
430                        compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg)
431 {
432         return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
433                          msgflg, compat_do_msg_fill);
434 }
435 
436 static inline int get_compat_msqid64(struct msqid64_ds *m64,
437                                      struct compat_msqid64_ds __user *up64)
438 {
439         int err;
440 
441         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
442                 return -EFAULT;
443         err  = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
444         err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
445         return err;
446 }
447 
448 static inline int get_compat_msqid(struct msqid64_ds *m,
449                                    struct compat_msqid_ds __user *up)
450 {
451         int err;
452 
453         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
454                 return -EFAULT;
455         err  = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
456         err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
457         return err;
458 }
459 
460 static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
461                                  struct compat_msqid64_ds __user *up64)
462 {
463         int err;
464 
465         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
466                 return -EFAULT;
467         err  = __put_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
468         err |= __put_user(m64->msg_stime, &up64->msg_stime);
469         err |= __put_user(m64->msg_rtime, &up64->msg_rtime);
470         err |= __put_user(m64->msg_ctime, &up64->msg_ctime);
471         err |= __put_user(m64->msg_cbytes, &up64->msg_cbytes);
472         err |= __put_user(m64->msg_qnum, &up64->msg_qnum);
473         err |= __put_user(m64->msg_qbytes, &up64->msg_qbytes);
474         err |= __put_user(m64->msg_lspid, &up64->msg_lspid);
475         err |= __put_user(m64->msg_lrpid, &up64->msg_lrpid);
476         return err;
477 }
478 
479 static inline int put_compat_msqid_ds(struct msqid64_ds *m,
480                                       struct compat_msqid_ds __user *up)
481 {
482         int err;
483 
484         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
485                 return -EFAULT;
486         err  = __put_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
487         err |= __put_user(m->msg_stime, &up->msg_stime);
488         err |= __put_user(m->msg_rtime, &up->msg_rtime);
489         err |= __put_user(m->msg_ctime, &up->msg_ctime);
490         err |= __put_user(m->msg_cbytes, &up->msg_cbytes);
491         err |= __put_user(m->msg_qnum, &up->msg_qnum);
492         err |= __put_user(m->msg_qbytes, &up->msg_qbytes);
493         err |= __put_user(m->msg_lspid, &up->msg_lspid);
494         err |= __put_user(m->msg_lrpid, &up->msg_lrpid);
495         return err;
496 }
497 
498 COMPAT_SYSCALL_DEFINE3(msgctl, int, first, int, second, void __user *, uptr)
499 {
500         int err, err2;
501         struct msqid64_ds m64;
502         int version = compat_ipc_parse_version(&second);
503         void __user *p;
504 
505         memset(&m64, 0, sizeof(m64));
506 
507         switch (second & (~IPC_64)) {
508         case IPC_INFO:
509         case IPC_RMID:
510         case MSG_INFO:
511                 err = sys_msgctl(first, second, uptr);
512                 break;
513 
514         case IPC_SET:
515                 if (version == IPC_64)
516                         err = get_compat_msqid64(&m64, uptr);
517                 else
518                         err = get_compat_msqid(&m64, uptr);
519 
520                 if (err)
521                         break;
522                 p = compat_alloc_user_space(sizeof(m64));
523                 if (copy_to_user(p, &m64, sizeof(m64)))
524                         err = -EFAULT;
525                 else
526                         err = sys_msgctl(first, second, p);
527                 break;
528 
529         case IPC_STAT:
530         case MSG_STAT:
531                 p = compat_alloc_user_space(sizeof(m64));
532                 err = sys_msgctl(first, second, p);
533                 if (err < 0)
534                         break;
535                 if (copy_from_user(&m64, p, sizeof(m64)))
536                         err2 = -EFAULT;
537                 else if (version == IPC_64)
538                         err2 = put_compat_msqid64_ds(&m64, uptr);
539                 else
540                         err2 = put_compat_msqid_ds(&m64, uptr);
541                 if (err2)
542                         err = -EFAULT;
543                 break;
544 
545         default:
546                 err = -EINVAL;
547                 break;
548         }
549         return err;
550 }
551 
552 COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
553 {
554         unsigned long ret;
555         long err;
556 
557         err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
558         if (err)
559                 return err;
560         force_successful_syscall_return();
561         return (long)ret;
562 }
563 
564 static inline int get_compat_shmid64_ds(struct shmid64_ds *sem64,
565                                         struct compat_shmid64_ds __user *up64)
566 {
567         if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
568                 return -EFAULT;
569         return __get_compat_ipc64_perm(&sem64->shm_perm, &up64->shm_perm);
570 }
571 
572 static inline int get_compat_shmid_ds(struct shmid64_ds *s,
573                                       struct compat_shmid_ds __user *up)
574 {
575         if (!access_ok(VERIFY_READ, up, sizeof(*up)))
576                 return -EFAULT;
577         return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
578 }
579 
580 static inline int put_compat_shmid64_ds(struct shmid64_ds *sem64,
581                                         struct compat_shmid64_ds __user *up64)
582 {
583         int err;
584 
585         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
586                 return -EFAULT;
587         err  = __put_compat_ipc64_perm(&sem64->shm_perm, &up64->shm_perm);
588         err |= __put_user(sem64->shm_atime, &up64->shm_atime);
589         err |= __put_user(sem64->shm_dtime, &up64->shm_dtime);
590         err |= __put_user(sem64->shm_ctime, &up64->shm_ctime);
591         err |= __put_user(sem64->shm_segsz, &up64->shm_segsz);
592         err |= __put_user(sem64->shm_nattch, &up64->shm_nattch);
593         err |= __put_user(sem64->shm_cpid, &up64->shm_cpid);
594         err |= __put_user(sem64->shm_lpid, &up64->shm_lpid);
595         return err;
596 }
597 
598 static inline int put_compat_shmid_ds(struct shmid64_ds *s,
599                                       struct compat_shmid_ds __user *up)
600 {
601         int err;
602 
603         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
604                 return -EFAULT;
605         err  = __put_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
606         err |= __put_user(s->shm_atime, &up->shm_atime);
607         err |= __put_user(s->shm_dtime, &up->shm_dtime);
608         err |= __put_user(s->shm_ctime, &up->shm_ctime);
609         err |= __put_user(s->shm_segsz, &up->shm_segsz);
610         err |= __put_user(s->shm_nattch, &up->shm_nattch);
611         err |= __put_user(s->shm_cpid, &up->shm_cpid);
612         err |= __put_user(s->shm_lpid, &up->shm_lpid);
613         return err;
614 }
615 
616 static inline int put_compat_shminfo64(struct shminfo64 *smi,
617                                        struct compat_shminfo64 __user *up64)
618 {
619         int err;
620 
621         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
622                 return -EFAULT;
623         if (smi->shmmax > INT_MAX)
624                 smi->shmmax = INT_MAX;
625         err  = __put_user(smi->shmmax, &up64->shmmax);
626         err |= __put_user(smi->shmmin, &up64->shmmin);
627         err |= __put_user(smi->shmmni, &up64->shmmni);
628         err |= __put_user(smi->shmseg, &up64->shmseg);
629         err |= __put_user(smi->shmall, &up64->shmall);
630         return err;
631 }
632 
633 static inline int put_compat_shminfo(struct shminfo64 *smi,
634                                      struct shminfo __user *up)
635 {
636         int err;
637 
638         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
639                 return -EFAULT;
640         if (smi->shmmax > INT_MAX)
641                 smi->shmmax = INT_MAX;
642         err  = __put_user(smi->shmmax, &up->shmmax);
643         err |= __put_user(smi->shmmin, &up->shmmin);
644         err |= __put_user(smi->shmmni, &up->shmmni);
645         err |= __put_user(smi->shmseg, &up->shmseg);
646         err |= __put_user(smi->shmall, &up->shmall);
647         return err;
648 }
649 
650 static inline int put_compat_shm_info(struct shm_info __user *ip,
651                                       struct compat_shm_info __user *uip)
652 {
653         int err;
654         struct shm_info si;
655 
656         if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
657             copy_from_user(&si, ip, sizeof(si)))
658                 return -EFAULT;
659         err  = __put_user(si.used_ids, &uip->used_ids);
660         err |= __put_user(si.shm_tot, &uip->shm_tot);
661         err |= __put_user(si.shm_rss, &uip->shm_rss);
662         err |= __put_user(si.shm_swp, &uip->shm_swp);
663         err |= __put_user(si.swap_attempts, &uip->swap_attempts);
664         err |= __put_user(si.swap_successes, &uip->swap_successes);
665         return err;
666 }
667 
668 COMPAT_SYSCALL_DEFINE3(shmctl, int, first, int, second, void __user *, uptr)
669 {
670         void __user *p;
671         struct shmid64_ds sem64;
672         struct shminfo64 smi;
673         int err, err2;
674         int version = compat_ipc_parse_version(&second);
675 
676         memset(&sem64, 0, sizeof(sem64));
677 
678         switch (second & (~IPC_64)) {
679         case IPC_RMID:
680         case SHM_LOCK:
681         case SHM_UNLOCK:
682                 err = sys_shmctl(first, second, uptr);
683                 break;
684 
685         case IPC_INFO:
686                 p = compat_alloc_user_space(sizeof(smi));
687                 err = sys_shmctl(first, second, p);
688                 if (err < 0)
689                         break;
690                 if (copy_from_user(&smi, p, sizeof(smi)))
691                         err2 = -EFAULT;
692                 else if (version == IPC_64)
693                         err2 = put_compat_shminfo64(&smi, uptr);
694                 else
695                         err2 = put_compat_shminfo(&smi, uptr);
696                 if (err2)
697                         err = -EFAULT;
698                 break;
699 
700 
701         case IPC_SET:
702                 if (version == IPC_64)
703                         err = get_compat_shmid64_ds(&sem64, uptr);
704                 else
705                         err = get_compat_shmid_ds(&sem64, uptr);
706 
707                 if (err)
708                         break;
709                 p = compat_alloc_user_space(sizeof(sem64));
710                 if (copy_to_user(p, &sem64, sizeof(sem64)))
711                         err = -EFAULT;
712                 else
713                         err = sys_shmctl(first, second, p);
714                 break;
715 
716         case IPC_STAT:
717         case SHM_STAT:
718                 p = compat_alloc_user_space(sizeof(sem64));
719                 err = sys_shmctl(first, second, p);
720                 if (err < 0)
721                         break;
722                 if (copy_from_user(&sem64, p, sizeof(sem64)))
723                         err2 = -EFAULT;
724                 else if (version == IPC_64)
725                         err2 = put_compat_shmid64_ds(&sem64, uptr);
726                 else
727                         err2 = put_compat_shmid_ds(&sem64, uptr);
728                 if (err2)
729                         err = -EFAULT;
730                 break;
731 
732         case SHM_INFO:
733                 p = compat_alloc_user_space(sizeof(struct shm_info));
734                 err = sys_shmctl(first, second, p);
735                 if (err < 0)
736                         break;
737                 err2 = put_compat_shm_info(p, uptr);
738                 if (err2)
739                         err = -EFAULT;
740                 break;
741 
742         default:
743                 err = -EINVAL;
744                 break;
745         }
746         return err;
747 }
748 
749 COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
750                        unsigned, nsops,
751                        const struct compat_timespec __user *, timeout)
752 {
753         struct timespec __user *ts64;
754         if (compat_convert_timespec(&ts64, timeout))
755                 return -EFAULT;
756         return sys_semtimedop(semid, tsems, nsops, ts64);
757 }
758 

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