2 * 32 bit compatibility code for System V IPC
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)
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
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>
32 #include <linux/mutex.h>
33 #include <linux/uaccess.h>
37 struct compat_msgbuf {
42 struct compat_ipc_perm {
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;
60 unsigned short sem_nsems;
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;
79 struct compat_shmid_ds {
80 struct compat_ipc_perm shm_perm;
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;
93 struct compat_ipc_kludge {
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;
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;
116 static inline int compat_ipc_parse_version(int *cmd)
118 #ifdef CONFIG_ARCH_WANT_COMPAT_IPC_PARSE_VERSION
119 int version = *cmd & IPC_64;
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
131 /* With the asm-generic APIs, we always use the 64-bit versions. */
136 static inline int __get_compat_ipc64_perm(struct ipc64_perm *p64,
137 struct compat_ipc64_perm __user *up64)
141 err = __get_user(p64->uid, &up64->uid);
142 err |= __get_user(p64->gid, &up64->gid);
143 err |= __get_user(p64->mode, &up64->mode);
147 static inline int __get_compat_ipc_perm(struct ipc64_perm *p,
148 struct compat_ipc_perm __user *up)
152 err = __get_user(p->uid, &up->uid);
153 err |= __get_user(p->gid, &up->gid);
154 err |= __get_user(p->mode, &up->mode);
158 static inline int __put_compat_ipc64_perm(struct ipc64_perm *p64,
159 struct compat_ipc64_perm __user *up64)
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);
173 static inline int __put_compat_ipc_perm(struct ipc64_perm *p,
174 struct compat_ipc_perm __user *up)
180 err = __put_user(p->key, &up->key);
182 err |= __put_user(u, &up->uid);
184 err |= __put_user(g, &up->gid);
186 err |= __put_user(u, &up->cuid);
188 err |= __put_user(g, &up->cgid);
189 err |= __put_user(p->mode, &up->mode);
190 err |= __put_user(p->seq, &up->seq);
194 static inline int get_compat_semid64_ds(struct semid64_ds *s64,
195 struct compat_semid64_ds __user *up64)
197 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
199 return __get_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
202 static inline int get_compat_semid_ds(struct semid64_ds *s,
203 struct compat_semid_ds __user *up)
205 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
207 return __get_compat_ipc_perm(&s->sem_perm, &up->sem_perm);
210 static inline int put_compat_semid64_ds(struct semid64_ds *s64,
211 struct compat_semid64_ds __user *up64)
215 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
217 err = __put_compat_ipc64_perm(&s64->sem_perm, &up64->sem_perm);
218 err |= __put_user(s64->sem_otime, &up64->sem_otime);
219 err |= __put_user(s64->sem_ctime, &up64->sem_ctime);
220 err |= __put_user(s64->sem_nsems, &up64->sem_nsems);
224 static inline int put_compat_semid_ds(struct semid64_ds *s,
225 struct compat_semid_ds __user *up)
229 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
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);
238 static long do_compat_semctl(int first, int second, int third, u32 pad)
240 unsigned long fourth;
242 struct semid64_ds s64;
243 struct semid64_ds __user *up64;
244 int version = compat_ipc_parse_version(&third);
246 memset(&s64, 0, sizeof(s64));
248 if ((third & (~IPC_64)) == SETVAL)
250 fourth = (unsigned long)pad << 32;
255 fourth = (unsigned long)compat_ptr(pad);
256 switch (third & (~IPC_64)) {
267 err = sys_semctl(first, second, third, fourth);
272 up64 = compat_alloc_user_space(sizeof(s64));
273 fourth = (unsigned long)up64;
274 err = sys_semctl(first, second, third, fourth);
277 if (copy_from_user(&s64, up64, sizeof(s64)))
279 else if (version == IPC_64)
280 err2 = put_compat_semid64_ds(&s64, compat_ptr(pad));
282 err2 = put_compat_semid_ds(&s64, compat_ptr(pad));
288 if (version == IPC_64)
289 err = get_compat_semid64_ds(&s64, compat_ptr(pad));
291 err = get_compat_semid_ds(&s64, compat_ptr(pad));
293 up64 = compat_alloc_user_space(sizeof(s64));
294 if (copy_to_user(up64, &s64, sizeof(s64)))
299 fourth = (unsigned long)up64;
300 err = sys_semctl(first, second, third, fourth);
310 static long compat_do_msg_fill(void __user *dest, struct msg_msg *msg, size_t bufsz)
312 struct compat_msgbuf __user *msgp = dest;
315 if (put_user(msg->m_type, &msgp->mtype))
318 msgsz = (bufsz > msg->m_ts) ? msg->m_ts : bufsz;
319 if (store_msg(msgp->mtext, msg, msgsz))
324 #ifndef COMPAT_SHMLBA
325 #define COMPAT_SHMLBA SHMLBA
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)
335 version = call >> 16; /* hack for backward compatibility */
340 /* struct sembuf is the same on 32 and 64bit :)) */
341 return sys_semtimedop(first, compat_ptr(ptr), second, NULL);
343 return compat_sys_semtimedop(first, compat_ptr(ptr), second,
346 return sys_semget(first, second, third);
350 if (get_user(pad, (u32 __user *) compat_ptr(ptr)))
352 return do_compat_semctl(first, second, third, pad);
355 struct compat_msgbuf __user *up = compat_ptr(ptr);
358 if (first < 0 || second < 0)
361 if (get_user(type, &up->mtype))
364 return do_msgsnd(first, type, up->mtext, second, third);
367 void __user *uptr = compat_ptr(ptr);
369 if (first < 0 || second < 0)
373 struct compat_ipc_kludge ipck;
376 if (copy_from_user(&ipck, uptr, sizeof(ipck)))
378 uptr = compat_ptr(ipck.msgp);
381 return do_msgrcv(first, uptr, second, (s32)fifth, third,
385 return sys_msgget(first, second);
387 return compat_sys_msgctl(first, second, compat_ptr(ptr));
395 err = do_shmat(first, compat_ptr(ptr), second, &raddr,
399 return put_user(raddr, (compat_ulong_t *)compat_ptr(third));
402 return sys_shmdt(compat_ptr(ptr));
404 return sys_shmget(first, (unsigned)second, third);
406 return compat_sys_shmctl(first, second, compat_ptr(ptr));
413 COMPAT_SYSCALL_DEFINE4(semctl, int, semid, int, semnum, int, cmd, int, arg)
415 return do_compat_semctl(semid, semnum, cmd, arg);
418 COMPAT_SYSCALL_DEFINE4(msgsnd, int, msqid, compat_uptr_t, msgp,
419 compat_ssize_t, msgsz, int, msgflg)
421 struct compat_msgbuf __user *up = compat_ptr(msgp);
424 if (get_user(mtype, &up->mtype))
426 return do_msgsnd(msqid, mtype, up->mtext, (ssize_t)msgsz, msgflg);
429 COMPAT_SYSCALL_DEFINE5(msgrcv, int, msqid, compat_uptr_t, msgp,
430 compat_ssize_t, msgsz, compat_long_t, msgtyp, int, msgflg)
432 return do_msgrcv(msqid, compat_ptr(msgp), (ssize_t)msgsz, (long)msgtyp,
433 msgflg, compat_do_msg_fill);
436 static inline int get_compat_msqid64(struct msqid64_ds *m64,
437 struct compat_msqid64_ds __user *up64)
441 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
443 err = __get_compat_ipc64_perm(&m64->msg_perm, &up64->msg_perm);
444 err |= __get_user(m64->msg_qbytes, &up64->msg_qbytes);
448 static inline int get_compat_msqid(struct msqid64_ds *m,
449 struct compat_msqid_ds __user *up)
453 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
455 err = __get_compat_ipc_perm(&m->msg_perm, &up->msg_perm);
456 err |= __get_user(m->msg_qbytes, &up->msg_qbytes);
460 static inline int put_compat_msqid64_ds(struct msqid64_ds *m64,
461 struct compat_msqid64_ds __user *up64)
465 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
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);
479 static inline int put_compat_msqid_ds(struct msqid64_ds *m,
480 struct compat_msqid_ds __user *up)
484 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
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);
498 COMPAT_SYSCALL_DEFINE3(msgctl, int, first, int, second, void __user *, uptr)
501 struct msqid64_ds m64;
502 int version = compat_ipc_parse_version(&second);
505 memset(&m64, 0, sizeof(m64));
507 switch (second & (~IPC_64)) {
511 err = sys_msgctl(first, second, uptr);
515 if (version == IPC_64)
516 err = get_compat_msqid64(&m64, uptr);
518 err = get_compat_msqid(&m64, uptr);
522 p = compat_alloc_user_space(sizeof(m64));
523 if (copy_to_user(p, &m64, sizeof(m64)))
526 err = sys_msgctl(first, second, p);
531 p = compat_alloc_user_space(sizeof(m64));
532 err = sys_msgctl(first, second, p);
535 if (copy_from_user(&m64, p, sizeof(m64)))
537 else if (version == IPC_64)
538 err2 = put_compat_msqid64_ds(&m64, uptr);
540 err2 = put_compat_msqid_ds(&m64, uptr);
552 COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg)
557 err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
560 force_successful_syscall_return();
564 static inline int get_compat_shmid64_ds(struct shmid64_ds *s64,
565 struct compat_shmid64_ds __user *up64)
567 if (!access_ok(VERIFY_READ, up64, sizeof(*up64)))
569 return __get_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
572 static inline int get_compat_shmid_ds(struct shmid64_ds *s,
573 struct compat_shmid_ds __user *up)
575 if (!access_ok(VERIFY_READ, up, sizeof(*up)))
577 return __get_compat_ipc_perm(&s->shm_perm, &up->shm_perm);
580 static inline int put_compat_shmid64_ds(struct shmid64_ds *s64,
581 struct compat_shmid64_ds __user *up64)
585 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
587 err = __put_compat_ipc64_perm(&s64->shm_perm, &up64->shm_perm);
588 err |= __put_user(s64->shm_atime, &up64->shm_atime);
589 err |= __put_user(s64->shm_dtime, &up64->shm_dtime);
590 err |= __put_user(s64->shm_ctime, &up64->shm_ctime);
591 err |= __put_user(s64->shm_segsz, &up64->shm_segsz);
592 err |= __put_user(s64->shm_nattch, &up64->shm_nattch);
593 err |= __put_user(s64->shm_cpid, &up64->shm_cpid);
594 err |= __put_user(s64->shm_lpid, &up64->shm_lpid);
598 static inline int put_compat_shmid_ds(struct shmid64_ds *s,
599 struct compat_shmid_ds __user *up)
603 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
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);
616 static inline int put_compat_shminfo64(struct shminfo64 *smi,
617 struct compat_shminfo64 __user *up64)
621 if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
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);
633 static inline int put_compat_shminfo(struct shminfo64 *smi,
634 struct shminfo __user *up)
638 if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
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);
650 static inline int put_compat_shm_info(struct shm_info __user *ip,
651 struct compat_shm_info __user *uip)
656 if (!access_ok(VERIFY_WRITE, uip, sizeof(*uip)) ||
657 copy_from_user(&si, ip, sizeof(si)))
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);
668 COMPAT_SYSCALL_DEFINE3(shmctl, int, first, int, second, void __user *, uptr)
671 struct shmid64_ds s64;
672 struct shminfo64 smi;
674 int version = compat_ipc_parse_version(&second);
676 memset(&s64, 0, sizeof(s64));
678 switch (second & (~IPC_64)) {
682 err = sys_shmctl(first, second, uptr);
686 p = compat_alloc_user_space(sizeof(smi));
687 err = sys_shmctl(first, second, p);
690 if (copy_from_user(&smi, p, sizeof(smi)))
692 else if (version == IPC_64)
693 err2 = put_compat_shminfo64(&smi, uptr);
695 err2 = put_compat_shminfo(&smi, uptr);
702 if (version == IPC_64)
703 err = get_compat_shmid64_ds(&s64, uptr);
705 err = get_compat_shmid_ds(&s64, uptr);
709 p = compat_alloc_user_space(sizeof(s64));
710 if (copy_to_user(p, &s64, sizeof(s64)))
713 err = sys_shmctl(first, second, p);
718 p = compat_alloc_user_space(sizeof(s64));
719 err = sys_shmctl(first, second, p);
722 if (copy_from_user(&s64, p, sizeof(s64)))
724 else if (version == IPC_64)
725 err2 = put_compat_shmid64_ds(&s64, uptr);
727 err2 = put_compat_shmid_ds(&s64, uptr);
733 p = compat_alloc_user_space(sizeof(struct shm_info));
734 err = sys_shmctl(first, second, p);
737 err2 = put_compat_shm_info(p, uptr);
749 COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems,
751 const struct compat_timespec __user *, timeout)
753 struct timespec __user *ts64;
754 if (compat_convert_timespec(&ts64, timeout))
756 return sys_semtimedop(semid, tsems, nsops, ts64);