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Linux 2.6.26-rc5
[linux-2.6/openmoko-kernel/knife-kernel.git] / arch / s390 / kernel / compat_linux.c
blobd7f22226fc4ec61a569f258c2e0903bbd0c121f3
1 /*
2 * arch/s390x/kernel/linux32.c
3 *
4 * S390 version
5 * Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
7 * Gerhard Tonn (ton@de.ibm.com)
8 * Thomas Spatzier (tspat@de.ibm.com)
9 *
10 * Conversion between 31bit and 64bit native syscalls.
11 *
12 * Heavily inspired by the 32-bit Sparc compat code which is
13 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
14 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
15 *
16 */
17
18
19 #include <linux/kernel.h>
20 #include <linux/sched.h>
21 #include <linux/fs.h>
22 #include <linux/mm.h>
23 #include <linux/file.h>
24 #include <linux/signal.h>
25 #include <linux/resource.h>
26 #include <linux/times.h>
27 #include <linux/utsname.h>
28 #include <linux/smp.h>
29 #include <linux/smp_lock.h>
30 #include <linux/sem.h>
31 #include <linux/msg.h>
32 #include <linux/shm.h>
33 #include <linux/slab.h>
34 #include <linux/uio.h>
35 #include <linux/nfs_fs.h>
36 #include <linux/quota.h>
37 #include <linux/module.h>
38 #include <linux/sunrpc/svc.h>
39 #include <linux/nfsd/nfsd.h>
40 #include <linux/nfsd/cache.h>
41 #include <linux/nfsd/xdr.h>
42 #include <linux/nfsd/syscall.h>
43 #include <linux/poll.h>
44 #include <linux/personality.h>
45 #include <linux/stat.h>
46 #include <linux/filter.h>
47 #include <linux/highmem.h>
48 #include <linux/highuid.h>
49 #include <linux/mman.h>
50 #include <linux/ipv6.h>
51 #include <linux/in.h>
52 #include <linux/icmpv6.h>
53 #include <linux/syscalls.h>
54 #include <linux/sysctl.h>
55 #include <linux/binfmts.h>
56 #include <linux/capability.h>
57 #include <linux/compat.h>
58 #include <linux/vfs.h>
59 #include <linux/ptrace.h>
60 #include <linux/fadvise.h>
61 #include <linux/ipc.h>
62
63 #include <asm/types.h>
64 #include <asm/uaccess.h>
65
66 #include <net/scm.h>
67 #include <net/sock.h>
68
69 #include "compat_linux.h"
70
71 long psw_user32_bits = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
72 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
73 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
74 long psw32_user_bits = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
75 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
76 PSW32_MASK_PSTATE);
77
78 /* For this source file, we want overflow handling. */
79
80 #undef high2lowuid
81 #undef high2lowgid
82 #undef low2highuid
83 #undef low2highgid
84 #undef SET_UID16
85 #undef SET_GID16
86 #undef NEW_TO_OLD_UID
87 #undef NEW_TO_OLD_GID
88 #undef SET_OLDSTAT_UID
89 #undef SET_OLDSTAT_GID
90 #undef SET_STAT_UID
91 #undef SET_STAT_GID
92
93 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
94 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
95 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
96 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
97 #define SET_UID16(var, uid) var = high2lowuid(uid)
98 #define SET_GID16(var, gid) var = high2lowgid(gid)
99 #define NEW_TO_OLD_UID(uid) high2lowuid(uid)
100 #define NEW_TO_OLD_GID(gid) high2lowgid(gid)
101 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
102 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
103 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
104 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
105
106 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
107 {
108 return sys_chown(filename, low2highuid(user), low2highgid(group));
109 }
110
111 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
112 {
113 return sys_lchown(filename, low2highuid(user), low2highgid(group));
114 }
115
116 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
117 {
118 return sys_fchown(fd, low2highuid(user), low2highgid(group));
119 }
120
121 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
122 {
123 return sys_setregid(low2highgid(rgid), low2highgid(egid));
124 }
125
126 asmlinkage long sys32_setgid16(u16 gid)
127 {
128 return sys_setgid((gid_t)gid);
129 }
130
131 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
132 {
133 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
134 }
135
136 asmlinkage long sys32_setuid16(u16 uid)
137 {
138 return sys_setuid((uid_t)uid);
139 }
140
141 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
142 {
143 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
144 low2highuid(suid));
145 }
146
147 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
148 {
149 int retval;
150
151 if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
152 !(retval = put_user(high2lowuid(current->euid), euid)))
153 retval = put_user(high2lowuid(current->suid), suid);
154
155 return retval;
156 }
157
158 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
159 {
160 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
161 low2highgid(sgid));
162 }
163
164 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
165 {
166 int retval;
167
168 if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
169 !(retval = put_user(high2lowgid(current->egid), egid)))
170 retval = put_user(high2lowgid(current->sgid), sgid);
171
172 return retval;
173 }
174
175 asmlinkage long sys32_setfsuid16(u16 uid)
176 {
177 return sys_setfsuid((uid_t)uid);
178 }
179
180 asmlinkage long sys32_setfsgid16(u16 gid)
181 {
182 return sys_setfsgid((gid_t)gid);
183 }
184
185 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
186 {
187 int i;
188 u16 group;
189
190 for (i = 0; i < group_info->ngroups; i++) {
191 group = (u16)GROUP_AT(group_info, i);
192 if (put_user(group, grouplist+i))
193 return -EFAULT;
194 }
195
196 return 0;
197 }
198
199 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
200 {
201 int i;
202 u16 group;
203
204 for (i = 0; i < group_info->ngroups; i++) {
205 if (get_user(group, grouplist+i))
206 return -EFAULT;
207 GROUP_AT(group_info, i) = (gid_t)group;
208 }
209
210 return 0;
211 }
212
213 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
214 {
215 int i;
216
217 if (gidsetsize < 0)
218 return -EINVAL;
219
220 get_group_info(current->group_info);
221 i = current->group_info->ngroups;
222 if (gidsetsize) {
223 if (i > gidsetsize) {
224 i = -EINVAL;
225 goto out;
226 }
227 if (groups16_to_user(grouplist, current->group_info)) {
228 i = -EFAULT;
229 goto out;
230 }
231 }
232 out:
233 put_group_info(current->group_info);
234 return i;
235 }
236
237 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
238 {
239 struct group_info *group_info;
240 int retval;
241
242 if (!capable(CAP_SETGID))
243 return -EPERM;
244 if ((unsigned)gidsetsize > NGROUPS_MAX)
245 return -EINVAL;
246
247 group_info = groups_alloc(gidsetsize);
248 if (!group_info)
249 return -ENOMEM;
250 retval = groups16_from_user(group_info, grouplist);
251 if (retval) {
252 put_group_info(group_info);
253 return retval;
254 }
255
256 retval = set_current_groups(group_info);
257 put_group_info(group_info);
258
259 return retval;
260 }
261
262 asmlinkage long sys32_getuid16(void)
263 {
264 return high2lowuid(current->uid);
265 }
266
267 asmlinkage long sys32_geteuid16(void)
268 {
269 return high2lowuid(current->euid);
270 }
271
272 asmlinkage long sys32_getgid16(void)
273 {
274 return high2lowgid(current->gid);
275 }
276
277 asmlinkage long sys32_getegid16(void)
278 {
279 return high2lowgid(current->egid);
280 }
281
282 /* 32-bit timeval and related flotsam. */
283
284 static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i)
285 {
286 return (!access_ok(VERIFY_READ, o, sizeof(*o)) ||
287 (__get_user(o->tv_sec, &i->tv_sec) ||
288 __get_user(o->tv_usec, &i->tv_usec)));
289 }
290
291 static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
292 {
293 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
294 (__put_user(i->tv_sec, &o->tv_sec) ||
295 __put_user(i->tv_usec, &o->tv_usec)));
296 }
297
298 /*
299 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
300 *
301 * This is really horribly ugly.
302 */
303 #ifdef CONFIG_SYSVIPC
304 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
305 {
306 if (call >> 16) /* hack for backward compatibility */
307 return -EINVAL;
308
309 call &= 0xffff;
310
311 switch (call) {
312 case SEMTIMEDOP:
313 return compat_sys_semtimedop(first, compat_ptr(ptr),
314 second, compat_ptr(third));
315 case SEMOP:
316 /* struct sembuf is the same on 32 and 64bit :)) */
317 return sys_semtimedop(first, compat_ptr(ptr),
318 second, NULL);
319 case SEMGET:
320 return sys_semget(first, second, third);
321 case SEMCTL:
322 return compat_sys_semctl(first, second, third,
323 compat_ptr(ptr));
324 case MSGSND:
325 return compat_sys_msgsnd(first, second, third,
326 compat_ptr(ptr));
327 case MSGRCV:
328 return compat_sys_msgrcv(first, second, 0, third,
329 0, compat_ptr(ptr));
330 case MSGGET:
331 return sys_msgget((key_t) first, second);
332 case MSGCTL:
333 return compat_sys_msgctl(first, second, compat_ptr(ptr));
334 case SHMAT:
335 return compat_sys_shmat(first, second, third,
336 0, compat_ptr(ptr));
337 case SHMDT:
338 return sys_shmdt(compat_ptr(ptr));
339 case SHMGET:
340 return sys_shmget(first, (unsigned)second, third);
341 case SHMCTL:
342 return compat_sys_shmctl(first, second, compat_ptr(ptr));
343 }
344
345 return -ENOSYS;
346 }
347 #endif
348
349 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
350 {
351 if ((int)high < 0)
352 return -EINVAL;
353 else
354 return sys_truncate(path, (high << 32) | low);
355 }
356
357 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
358 {
359 if ((int)high < 0)
360 return -EINVAL;
361 else
362 return sys_ftruncate(fd, (high << 32) | low);
363 }
364
365 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
366 {
367 compat_ino_t ino;
368 int err;
369
370 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
371 return -EOVERFLOW;
372
373 ino = stat->ino;
374 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
375 return -EOVERFLOW;
376
377 err = put_user(old_encode_dev(stat->dev), &statbuf->st_dev);
378 err |= put_user(stat->ino, &statbuf->st_ino);
379 err |= put_user(stat->mode, &statbuf->st_mode);
380 err |= put_user(stat->nlink, &statbuf->st_nlink);
381 err |= put_user(high2lowuid(stat->uid), &statbuf->st_uid);
382 err |= put_user(high2lowgid(stat->gid), &statbuf->st_gid);
383 err |= put_user(old_encode_dev(stat->rdev), &statbuf->st_rdev);
384 err |= put_user(stat->size, &statbuf->st_size);
385 err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
386 err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
387 err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
388 err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
389 err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
390 err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
391 err |= put_user(stat->blksize, &statbuf->st_blksize);
392 err |= put_user(stat->blocks, &statbuf->st_blocks);
393 /* fixme
394 err |= put_user(0, &statbuf->__unused4[0]);
395 err |= put_user(0, &statbuf->__unused4[1]);
396 */
397 return err;
398 }
399
400 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
401 struct compat_timespec __user *interval)
402 {
403 struct timespec t;
404 int ret;
405 mm_segment_t old_fs = get_fs ();
406
407 set_fs (KERNEL_DS);
408 ret = sys_sched_rr_get_interval(pid,
409 (struct timespec __force __user *) &t);
410 set_fs (old_fs);
411 if (put_compat_timespec(&t, interval))
412 return -EFAULT;
413 return ret;
414 }
415
416 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
417 compat_sigset_t __user *oset, size_t sigsetsize)
418 {
419 sigset_t s;
420 compat_sigset_t s32;
421 int ret;
422 mm_segment_t old_fs = get_fs();
423
424 if (set) {
425 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
426 return -EFAULT;
427 switch (_NSIG_WORDS) {
428 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
429 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
430 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
431 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
432 }
433 }
434 set_fs (KERNEL_DS);
435 ret = sys_rt_sigprocmask(how,
436 set ? (sigset_t __force __user *) &s : NULL,
437 oset ? (sigset_t __force __user *) &s : NULL,
438 sigsetsize);
439 set_fs (old_fs);
440 if (ret) return ret;
441 if (oset) {
442 switch (_NSIG_WORDS) {
443 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
444 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
445 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
446 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
447 }
448 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
449 return -EFAULT;
450 }
451 return 0;
452 }
453
454 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
455 size_t sigsetsize)
456 {
457 sigset_t s;
458 compat_sigset_t s32;
459 int ret;
460 mm_segment_t old_fs = get_fs();
461
462 set_fs (KERNEL_DS);
463 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
464 set_fs (old_fs);
465 if (!ret) {
466 switch (_NSIG_WORDS) {
467 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
468 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
469 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
470 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
471 }
472 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
473 return -EFAULT;
474 }
475 return ret;
476 }
477
478 asmlinkage long
479 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
480 {
481 siginfo_t info;
482 int ret;
483 mm_segment_t old_fs = get_fs();
484
485 if (copy_siginfo_from_user32(&info, uinfo))
486 return -EFAULT;
487 set_fs (KERNEL_DS);
488 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
489 set_fs (old_fs);
490 return ret;
491 }
492
493 /*
494 * sys32_execve() executes a new program after the asm stub has set
495 * things up for us. This should basically do what I want it to.
496 */
497 asmlinkage long sys32_execve(void)
498 {
499 struct pt_regs *regs = task_pt_regs(current);
500 char *filename;
501 unsigned long result;
502 int rc;
503
504 filename = getname(compat_ptr(regs->orig_gpr2));
505 if (IS_ERR(filename)) {
506 result = PTR_ERR(filename);
507 goto out;
508 }
509 rc = compat_do_execve(filename, compat_ptr(regs->gprs[3]),
510 compat_ptr(regs->gprs[4]), regs);
511 if (rc) {
512 result = rc;
513 goto out_putname;
514 }
515 task_lock(current);
516 current->ptrace &= ~PT_DTRACE;
517 task_unlock(current);
518 current->thread.fp_regs.fpc=0;
519 asm volatile("sfpc %0,0" : : "d" (0));
520 result = regs->gprs[2];
521 out_putname:
522 putname(filename);
523 out:
524 return result;
525 }
526
527
528 #ifdef CONFIG_MODULES
529
530 asmlinkage long
531 sys32_init_module(void __user *umod, unsigned long len,
532 const char __user *uargs)
533 {
534 return sys_init_module(umod, len, uargs);
535 }
536
537 asmlinkage long
538 sys32_delete_module(const char __user *name_user, unsigned int flags)
539 {
540 return sys_delete_module(name_user, flags);
541 }
542
543 #else /* CONFIG_MODULES */
544
545 asmlinkage long
546 sys32_init_module(void __user *umod, unsigned long len,
547 const char __user *uargs)
548 {
549 return -ENOSYS;
550 }
551
552 asmlinkage long
553 sys32_delete_module(const char __user *name_user, unsigned int flags)
554 {
555 return -ENOSYS;
556 }
557
558 #endif /* CONFIG_MODULES */
559
560 /* Translations due to time_t size differences. Which affects all
561 sorts of things, like timeval and itimerval. */
562
563 extern struct timezone sys_tz;
564
565 asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
566 {
567 if (tv) {
568 struct timeval ktv;
569 do_gettimeofday(&ktv);
570 if (put_tv32(tv, &ktv))
571 return -EFAULT;
572 }
573 if (tz) {
574 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
575 return -EFAULT;
576 }
577 return 0;
578 }
579
580 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
581 {
582 long usec;
583
584 if (!access_ok(VERIFY_READ, i, sizeof(*i)))
585 return -EFAULT;
586 if (__get_user(o->tv_sec, &i->tv_sec))
587 return -EFAULT;
588 if (__get_user(usec, &i->tv_usec))
589 return -EFAULT;
590 o->tv_nsec = usec * 1000;
591 return 0;
592 }
593
594 asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
595 {
596 struct timespec kts;
597 struct timezone ktz;
598
599 if (tv) {
600 if (get_ts32(&kts, tv))
601 return -EFAULT;
602 }
603 if (tz) {
604 if (copy_from_user(&ktz, tz, sizeof(ktz)))
605 return -EFAULT;
606 }
607
608 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
609 }
610
611 /* These are here just in case some old sparc32 binary calls it. */
612 asmlinkage long sys32_pause(void)
613 {
614 current->state = TASK_INTERRUPTIBLE;
615 schedule();
616 return -ERESTARTNOHAND;
617 }
618
619 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
620 size_t count, u32 poshi, u32 poslo)
621 {
622 if ((compat_ssize_t) count < 0)
623 return -EINVAL;
624 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
625 }
626
627 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
628 size_t count, u32 poshi, u32 poslo)
629 {
630 if ((compat_ssize_t) count < 0)
631 return -EINVAL;
632 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
633 }
634
635 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
636 {
637 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
638 }
639
640 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
641 {
642 mm_segment_t old_fs = get_fs();
643 int ret;
644 off_t of;
645
646 if (offset && get_user(of, offset))
647 return -EFAULT;
648
649 set_fs(KERNEL_DS);
650 ret = sys_sendfile(out_fd, in_fd,
651 offset ? (off_t __force __user *) &of : NULL, count);
652 set_fs(old_fs);
653
654 if (offset && put_user(of, offset))
655 return -EFAULT;
656
657 return ret;
658 }
659
660 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
661 compat_loff_t __user *offset, s32 count)
662 {
663 mm_segment_t old_fs = get_fs();
664 int ret;
665 loff_t lof;
666
667 if (offset && get_user(lof, offset))
668 return -EFAULT;
669
670 set_fs(KERNEL_DS);
671 ret = sys_sendfile64(out_fd, in_fd,
672 offset ? (loff_t __force __user *) &lof : NULL,
673 count);
674 set_fs(old_fs);
675
676 if (offset && put_user(lof, offset))
677 return -EFAULT;
678
679 return ret;
680 }
681
682 #ifdef CONFIG_SYSCTL_SYSCALL
683 struct __sysctl_args32 {
684 u32 name;
685 int nlen;
686 u32 oldval;
687 u32 oldlenp;
688 u32 newval;
689 u32 newlen;
690 u32 __unused[4];
691 };
692
693 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
694 {
695 struct __sysctl_args32 tmp;
696 int error;
697 size_t oldlen;
698 size_t __user *oldlenp = NULL;
699 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
700
701 if (copy_from_user(&tmp, args, sizeof(tmp)))
702 return -EFAULT;
703
704 if (tmp.oldval && tmp.oldlenp) {
705 /* Duh, this is ugly and might not work if sysctl_args
706 is in read-only memory, but do_sysctl does indirectly
707 a lot of uaccess in both directions and we'd have to
708 basically copy the whole sysctl.c here, and
709 glibc's __sysctl uses rw memory for the structure
710 anyway. */
711 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
712 put_user(oldlen, (size_t __user *)addr))
713 return -EFAULT;
714 oldlenp = (size_t __user *)addr;
715 }
716
717 lock_kernel();
718 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
719 oldlenp, compat_ptr(tmp.newval), tmp.newlen);
720 unlock_kernel();
721 if (oldlenp) {
722 if (!error) {
723 if (get_user(oldlen, (size_t __user *)addr) ||
724 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
725 error = -EFAULT;
726 }
727 if (copy_to_user(args->__unused, tmp.__unused,
728 sizeof(tmp.__unused)))
729 error = -EFAULT;
730 }
731 return error;
732 }
733 #endif
734
735 struct stat64_emu31 {
736 unsigned long long st_dev;
737 unsigned int __pad1;
738 #define STAT64_HAS_BROKEN_ST_INO 1
739 u32 __st_ino;
740 unsigned int st_mode;
741 unsigned int st_nlink;
742 u32 st_uid;
743 u32 st_gid;
744 unsigned long long st_rdev;
745 unsigned int __pad3;
746 long st_size;
747 u32 st_blksize;
748 unsigned char __pad4[4];
749 u32 __pad5; /* future possible st_blocks high bits */
750 u32 st_blocks; /* Number 512-byte blocks allocated. */
751 u32 st_atime;
752 u32 __pad6;
753 u32 st_mtime;
754 u32 __pad7;
755 u32 st_ctime;
756 u32 __pad8; /* will be high 32 bits of ctime someday */
757 unsigned long st_ino;
758 };
759
760 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
761 {
762 struct stat64_emu31 tmp;
763
764 memset(&tmp, 0, sizeof(tmp));
765
766 tmp.st_dev = huge_encode_dev(stat->dev);
767 tmp.st_ino = stat->ino;
768 tmp.__st_ino = (u32)stat->ino;
769 tmp.st_mode = stat->mode;
770 tmp.st_nlink = (unsigned int)stat->nlink;
771 tmp.st_uid = stat->uid;
772 tmp.st_gid = stat->gid;
773 tmp.st_rdev = huge_encode_dev(stat->rdev);
774 tmp.st_size = stat->size;
775 tmp.st_blksize = (u32)stat->blksize;
776 tmp.st_blocks = (u32)stat->blocks;
777 tmp.st_atime = (u32)stat->atime.tv_sec;
778 tmp.st_mtime = (u32)stat->mtime.tv_sec;
779 tmp.st_ctime = (u32)stat->ctime.tv_sec;
780
781 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
782 }
783
784 asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
785 {
786 struct kstat stat;
787 int ret = vfs_stat(filename, &stat);
788 if (!ret)
789 ret = cp_stat64(statbuf, &stat);
790 return ret;
791 }
792
793 asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
794 {
795 struct kstat stat;
796 int ret = vfs_lstat(filename, &stat);
797 if (!ret)
798 ret = cp_stat64(statbuf, &stat);
799 return ret;
800 }
801
802 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
803 {
804 struct kstat stat;
805 int ret = vfs_fstat(fd, &stat);
806 if (!ret)
807 ret = cp_stat64(statbuf, &stat);
808 return ret;
809 }
810
811 asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
812 struct stat64_emu31 __user* statbuf, int flag)
813 {
814 struct kstat stat;
815 int error = -EINVAL;
816
817 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
818 goto out;
819
820 if (flag & AT_SYMLINK_NOFOLLOW)
821 error = vfs_lstat_fd(dfd, filename, &stat);
822 else
823 error = vfs_stat_fd(dfd, filename, &stat);
824
825 if (!error)
826 error = cp_stat64(statbuf, &stat);
827 out:
828 return error;
829 }
830
831 /*
832 * Linux/i386 didn't use to be able to handle more than
833 * 4 system call parameters, so these system calls used a memory
834 * block for parameter passing..
835 */
836
837 struct mmap_arg_struct_emu31 {
838 u32 addr;
839 u32 len;
840 u32 prot;
841 u32 flags;
842 u32 fd;
843 u32 offset;
844 };
845
846 /* common code for old and new mmaps */
847 static inline long do_mmap2(
848 unsigned long addr, unsigned long len,
849 unsigned long prot, unsigned long flags,
850 unsigned long fd, unsigned long pgoff)
851 {
852 struct file * file = NULL;
853 unsigned long error = -EBADF;
854
855 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
856 if (!(flags & MAP_ANONYMOUS)) {
857 file = fget(fd);
858 if (!file)
859 goto out;
860 }
861
862 down_write(&current->mm->mmap_sem);
863 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
864 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
865 /* Result is out of bounds. */
866 do_munmap(current->mm, addr, len);
867 error = -ENOMEM;
868 }
869 up_write(&current->mm->mmap_sem);
870
871 if (file)
872 fput(file);
873 out:
874 return error;
875 }
876
877
878 asmlinkage unsigned long
879 old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
880 {
881 struct mmap_arg_struct_emu31 a;
882 int error = -EFAULT;
883
884 if (copy_from_user(&a, arg, sizeof(a)))
885 goto out;
886
887 error = -EINVAL;
888 if (a.offset & ~PAGE_MASK)
889 goto out;
890
891 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
892 out:
893 return error;
894 }
895
896 asmlinkage long
897 sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
898 {
899 struct mmap_arg_struct_emu31 a;
900 int error = -EFAULT;
901
902 if (copy_from_user(&a, arg, sizeof(a)))
903 goto out;
904 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
905 out:
906 return error;
907 }
908
909 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
910 {
911 if ((compat_ssize_t) count < 0)
912 return -EINVAL;
913
914 return sys_read(fd, buf, count);
915 }
916
917 asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
918 {
919 if ((compat_ssize_t) count < 0)
920 return -EINVAL;
921
922 return sys_write(fd, buf, count);
923 }
924
925 asmlinkage long sys32_clone(void)
926 {
927 struct pt_regs *regs = task_pt_regs(current);
928 unsigned long clone_flags;
929 unsigned long newsp;
930 int __user *parent_tidptr, *child_tidptr;
931
932 clone_flags = regs->gprs[3] & 0xffffffffUL;
933 newsp = regs->orig_gpr2 & 0x7fffffffUL;
934 parent_tidptr = compat_ptr(regs->gprs[4]);
935 child_tidptr = compat_ptr(regs->gprs[5]);
936 if (!newsp)
937 newsp = regs->gprs[15];
938 return do_fork(clone_flags, newsp, regs, 0,
939 parent_tidptr, child_tidptr);
940 }
941
942 /*
943 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
944 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
945 * because the 31 bit values differ from the 64 bit values.
946 */
947
948 asmlinkage long
949 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
950 {
951 if (advise == 4)
952 advise = POSIX_FADV_DONTNEED;
953 else if (advise == 5)
954 advise = POSIX_FADV_NOREUSE;
955 return sys_fadvise64(fd, offset, len, advise);
956 }
957
958 struct fadvise64_64_args {
959 int fd;
960 long long offset;
961 long long len;
962 int advice;
963 };
964
965 asmlinkage long
966 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
967 {
968 struct fadvise64_64_args a;
969
970 if ( copy_from_user(&a, args, sizeof(a)) )
971 return -EFAULT;
972 if (a.advice == 4)
973 a.advice = POSIX_FADV_DONTNEED;
974 else if (a.advice == 5)
975 a.advice = POSIX_FADV_NOREUSE;
976 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
977 }
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