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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / arch / s390 / kernel / compat_linux.c
blob50b85d07ddd250ce81a1104ae59793b76a7ec507
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 #include <asm/semaphore.h>
66
67 #include <net/scm.h>
68 #include <net/sock.h>
69
70 #include "compat_linux.h"
71
72 long psw_user32_bits = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
73 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
74 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
75 long psw32_user_bits = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
76 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
77 PSW32_MASK_PSTATE);
78
79 /* For this source file, we want overflow handling. */
80
81 #undef high2lowuid
82 #undef high2lowgid
83 #undef low2highuid
84 #undef low2highgid
85 #undef SET_UID16
86 #undef SET_GID16
87 #undef NEW_TO_OLD_UID
88 #undef NEW_TO_OLD_GID
89 #undef SET_OLDSTAT_UID
90 #undef SET_OLDSTAT_GID
91 #undef SET_STAT_UID
92 #undef SET_STAT_GID
93
94 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
95 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
96 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
97 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
98 #define SET_UID16(var, uid) var = high2lowuid(uid)
99 #define SET_GID16(var, gid) var = high2lowgid(gid)
100 #define NEW_TO_OLD_UID(uid) high2lowuid(uid)
101 #define NEW_TO_OLD_GID(gid) high2lowgid(gid)
102 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
103 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
104 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
105 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
106
107 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
108 {
109 return sys_chown(filename, low2highuid(user), low2highgid(group));
110 }
111
112 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
113 {
114 return sys_lchown(filename, low2highuid(user), low2highgid(group));
115 }
116
117 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
118 {
119 return sys_fchown(fd, low2highuid(user), low2highgid(group));
120 }
121
122 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
123 {
124 return sys_setregid(low2highgid(rgid), low2highgid(egid));
125 }
126
127 asmlinkage long sys32_setgid16(u16 gid)
128 {
129 return sys_setgid((gid_t)gid);
130 }
131
132 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
133 {
134 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
135 }
136
137 asmlinkage long sys32_setuid16(u16 uid)
138 {
139 return sys_setuid((uid_t)uid);
140 }
141
142 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
143 {
144 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
145 low2highuid(suid));
146 }
147
148 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
149 {
150 int retval;
151
152 if (!(retval = put_user(high2lowuid(current->uid), ruid)) &&
153 !(retval = put_user(high2lowuid(current->euid), euid)))
154 retval = put_user(high2lowuid(current->suid), suid);
155
156 return retval;
157 }
158
159 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
160 {
161 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
162 low2highgid(sgid));
163 }
164
165 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
166 {
167 int retval;
168
169 if (!(retval = put_user(high2lowgid(current->gid), rgid)) &&
170 !(retval = put_user(high2lowgid(current->egid), egid)))
171 retval = put_user(high2lowgid(current->sgid), sgid);
172
173 return retval;
174 }
175
176 asmlinkage long sys32_setfsuid16(u16 uid)
177 {
178 return sys_setfsuid((uid_t)uid);
179 }
180
181 asmlinkage long sys32_setfsgid16(u16 gid)
182 {
183 return sys_setfsgid((gid_t)gid);
184 }
185
186 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
187 {
188 int i;
189 u16 group;
190
191 for (i = 0; i < group_info->ngroups; i++) {
192 group = (u16)GROUP_AT(group_info, i);
193 if (put_user(group, grouplist+i))
194 return -EFAULT;
195 }
196
197 return 0;
198 }
199
200 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
201 {
202 int i;
203 u16 group;
204
205 for (i = 0; i < group_info->ngroups; i++) {
206 if (get_user(group, grouplist+i))
207 return -EFAULT;
208 GROUP_AT(group_info, i) = (gid_t)group;
209 }
210
211 return 0;
212 }
213
214 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
215 {
216 int i;
217
218 if (gidsetsize < 0)
219 return -EINVAL;
220
221 get_group_info(current->group_info);
222 i = current->group_info->ngroups;
223 if (gidsetsize) {
224 if (i > gidsetsize) {
225 i = -EINVAL;
226 goto out;
227 }
228 if (groups16_to_user(grouplist, current->group_info)) {
229 i = -EFAULT;
230 goto out;
231 }
232 }
233 out:
234 put_group_info(current->group_info);
235 return i;
236 }
237
238 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
239 {
240 struct group_info *group_info;
241 int retval;
242
243 if (!capable(CAP_SETGID))
244 return -EPERM;
245 if ((unsigned)gidsetsize > NGROUPS_MAX)
246 return -EINVAL;
247
248 group_info = groups_alloc(gidsetsize);
249 if (!group_info)
250 return -ENOMEM;
251 retval = groups16_from_user(group_info, grouplist);
252 if (retval) {
253 put_group_info(group_info);
254 return retval;
255 }
256
257 retval = set_current_groups(group_info);
258 put_group_info(group_info);
259
260 return retval;
261 }
262
263 asmlinkage long sys32_getuid16(void)
264 {
265 return high2lowuid(current->uid);
266 }
267
268 asmlinkage long sys32_geteuid16(void)
269 {
270 return high2lowuid(current->euid);
271 }
272
273 asmlinkage long sys32_getgid16(void)
274 {
275 return high2lowgid(current->gid);
276 }
277
278 asmlinkage long sys32_getegid16(void)
279 {
280 return high2lowgid(current->egid);
281 }
282
283 /* 32-bit timeval and related flotsam. */
284
285 static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i)
286 {
287 return (!access_ok(VERIFY_READ, o, sizeof(*o)) ||
288 (__get_user(o->tv_sec, &i->tv_sec) ||
289 __get_user(o->tv_usec, &i->tv_usec)));
290 }
291
292 static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
293 {
294 return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
295 (__put_user(i->tv_sec, &o->tv_sec) ||
296 __put_user(i->tv_usec, &o->tv_usec)));
297 }
298
299 /*
300 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
301 *
302 * This is really horribly ugly.
303 */
304 #ifdef CONFIG_SYSVIPC
305 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
306 {
307 if (call >> 16) /* hack for backward compatibility */
308 return -EINVAL;
309
310 call &= 0xffff;
311
312 switch (call) {
313 case SEMTIMEDOP:
314 return compat_sys_semtimedop(first, compat_ptr(ptr),
315 second, compat_ptr(third));
316 case SEMOP:
317 /* struct sembuf is the same on 32 and 64bit :)) */
318 return sys_semtimedop(first, compat_ptr(ptr),
319 second, NULL);
320 case SEMGET:
321 return sys_semget(first, second, third);
322 case SEMCTL:
323 return compat_sys_semctl(first, second, third,
324 compat_ptr(ptr));
325 case MSGSND:
326 return compat_sys_msgsnd(first, second, third,
327 compat_ptr(ptr));
328 case MSGRCV:
329 return compat_sys_msgrcv(first, second, 0, third,
330 0, compat_ptr(ptr));
331 case MSGGET:
332 return sys_msgget((key_t) first, second);
333 case MSGCTL:
334 return compat_sys_msgctl(first, second, compat_ptr(ptr));
335 case SHMAT:
336 return compat_sys_shmat(first, second, third,
337 0, compat_ptr(ptr));
338 case SHMDT:
339 return sys_shmdt(compat_ptr(ptr));
340 case SHMGET:
341 return sys_shmget(first, (unsigned)second, third);
342 case SHMCTL:
343 return compat_sys_shmctl(first, second, compat_ptr(ptr));
344 }
345
346 return -ENOSYS;
347 }
348 #endif
349
350 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
351 {
352 if ((int)high < 0)
353 return -EINVAL;
354 else
355 return sys_truncate(path, (high << 32) | low);
356 }
357
358 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
359 {
360 if ((int)high < 0)
361 return -EINVAL;
362 else
363 return sys_ftruncate(fd, (high << 32) | low);
364 }
365
366 int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
367 {
368 compat_ino_t ino;
369 int err;
370
371 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
372 return -EOVERFLOW;
373
374 ino = stat->ino;
375 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
376 return -EOVERFLOW;
377
378 err = put_user(old_encode_dev(stat->dev), &statbuf->st_dev);
379 err |= put_user(stat->ino, &statbuf->st_ino);
380 err |= put_user(stat->mode, &statbuf->st_mode);
381 err |= put_user(stat->nlink, &statbuf->st_nlink);
382 err |= put_user(high2lowuid(stat->uid), &statbuf->st_uid);
383 err |= put_user(high2lowgid(stat->gid), &statbuf->st_gid);
384 err |= put_user(old_encode_dev(stat->rdev), &statbuf->st_rdev);
385 err |= put_user(stat->size, &statbuf->st_size);
386 err |= put_user(stat->atime.tv_sec, &statbuf->st_atime);
387 err |= put_user(stat->atime.tv_nsec, &statbuf->st_atime_nsec);
388 err |= put_user(stat->mtime.tv_sec, &statbuf->st_mtime);
389 err |= put_user(stat->mtime.tv_nsec, &statbuf->st_mtime_nsec);
390 err |= put_user(stat->ctime.tv_sec, &statbuf->st_ctime);
391 err |= put_user(stat->ctime.tv_nsec, &statbuf->st_ctime_nsec);
392 err |= put_user(stat->blksize, &statbuf->st_blksize);
393 err |= put_user(stat->blocks, &statbuf->st_blocks);
394 /* fixme
395 err |= put_user(0, &statbuf->__unused4[0]);
396 err |= put_user(0, &statbuf->__unused4[1]);
397 */
398 return err;
399 }
400
401 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
402 struct compat_timespec __user *interval)
403 {
404 struct timespec t;
405 int ret;
406 mm_segment_t old_fs = get_fs ();
407
408 set_fs (KERNEL_DS);
409 ret = sys_sched_rr_get_interval(pid,
410 (struct timespec __force __user *) &t);
411 set_fs (old_fs);
412 if (put_compat_timespec(&t, interval))
413 return -EFAULT;
414 return ret;
415 }
416
417 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
418 compat_sigset_t __user *oset, size_t sigsetsize)
419 {
420 sigset_t s;
421 compat_sigset_t s32;
422 int ret;
423 mm_segment_t old_fs = get_fs();
424
425 if (set) {
426 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
427 return -EFAULT;
428 switch (_NSIG_WORDS) {
429 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
430 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
431 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
432 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
433 }
434 }
435 set_fs (KERNEL_DS);
436 ret = sys_rt_sigprocmask(how,
437 set ? (sigset_t __force __user *) &s : NULL,
438 oset ? (sigset_t __force __user *) &s : NULL,
439 sigsetsize);
440 set_fs (old_fs);
441 if (ret) return ret;
442 if (oset) {
443 switch (_NSIG_WORDS) {
444 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
445 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
446 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
447 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
448 }
449 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
450 return -EFAULT;
451 }
452 return 0;
453 }
454
455 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
456 size_t sigsetsize)
457 {
458 sigset_t s;
459 compat_sigset_t s32;
460 int ret;
461 mm_segment_t old_fs = get_fs();
462
463 set_fs (KERNEL_DS);
464 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
465 set_fs (old_fs);
466 if (!ret) {
467 switch (_NSIG_WORDS) {
468 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
469 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
470 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
471 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
472 }
473 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
474 return -EFAULT;
475 }
476 return ret;
477 }
478
479 asmlinkage long
480 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
481 {
482 siginfo_t info;
483 int ret;
484 mm_segment_t old_fs = get_fs();
485
486 if (copy_siginfo_from_user32(&info, uinfo))
487 return -EFAULT;
488 set_fs (KERNEL_DS);
489 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
490 set_fs (old_fs);
491 return ret;
492 }
493
494 /*
495 * sys32_execve() executes a new program after the asm stub has set
496 * things up for us. This should basically do what I want it to.
497 */
498 asmlinkage long sys32_execve(void)
499 {
500 struct pt_regs *regs = task_pt_regs(current);
501 char *filename;
502 unsigned long result;
503 int rc;
504
505 filename = getname(compat_ptr(regs->orig_gpr2));
506 if (IS_ERR(filename)) {
507 result = PTR_ERR(filename);
508 goto out;
509 }
510 rc = compat_do_execve(filename, compat_ptr(regs->gprs[3]),
511 compat_ptr(regs->gprs[4]), regs);
512 if (rc) {
513 result = rc;
514 goto out_putname;
515 }
516 task_lock(current);
517 current->ptrace &= ~PT_DTRACE;
518 task_unlock(current);
519 current->thread.fp_regs.fpc=0;
520 asm volatile("sfpc %0,0" : : "d" (0));
521 result = regs->gprs[2];
522 out_putname:
523 putname(filename);
524 out:
525 return result;
526 }
527
528
529 #ifdef CONFIG_MODULES
530
531 asmlinkage long
532 sys32_init_module(void __user *umod, unsigned long len,
533 const char __user *uargs)
534 {
535 return sys_init_module(umod, len, uargs);
536 }
537
538 asmlinkage long
539 sys32_delete_module(const char __user *name_user, unsigned int flags)
540 {
541 return sys_delete_module(name_user, flags);
542 }
543
544 #else /* CONFIG_MODULES */
545
546 asmlinkage long
547 sys32_init_module(void __user *umod, unsigned long len,
548 const char __user *uargs)
549 {
550 return -ENOSYS;
551 }
552
553 asmlinkage long
554 sys32_delete_module(const char __user *name_user, unsigned int flags)
555 {
556 return -ENOSYS;
557 }
558
559 #endif /* CONFIG_MODULES */
560
561 /* Translations due to time_t size differences. Which affects all
562 sorts of things, like timeval and itimerval. */
563
564 extern struct timezone sys_tz;
565
566 asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
567 {
568 if (tv) {
569 struct timeval ktv;
570 do_gettimeofday(&ktv);
571 if (put_tv32(tv, &ktv))
572 return -EFAULT;
573 }
574 if (tz) {
575 if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
576 return -EFAULT;
577 }
578 return 0;
579 }
580
581 static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
582 {
583 long usec;
584
585 if (!access_ok(VERIFY_READ, i, sizeof(*i)))
586 return -EFAULT;
587 if (__get_user(o->tv_sec, &i->tv_sec))
588 return -EFAULT;
589 if (__get_user(usec, &i->tv_usec))
590 return -EFAULT;
591 o->tv_nsec = usec * 1000;
592 return 0;
593 }
594
595 asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
596 {
597 struct timespec kts;
598 struct timezone ktz;
599
600 if (tv) {
601 if (get_ts32(&kts, tv))
602 return -EFAULT;
603 }
604 if (tz) {
605 if (copy_from_user(&ktz, tz, sizeof(ktz)))
606 return -EFAULT;
607 }
608
609 return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
610 }
611
612 /* These are here just in case some old sparc32 binary calls it. */
613 asmlinkage long sys32_pause(void)
614 {
615 current->state = TASK_INTERRUPTIBLE;
616 schedule();
617 return -ERESTARTNOHAND;
618 }
619
620 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
621 size_t count, u32 poshi, u32 poslo)
622 {
623 if ((compat_ssize_t) count < 0)
624 return -EINVAL;
625 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
626 }
627
628 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
629 size_t count, u32 poshi, u32 poslo)
630 {
631 if ((compat_ssize_t) count < 0)
632 return -EINVAL;
633 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
634 }
635
636 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
637 {
638 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
639 }
640
641 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
642 {
643 mm_segment_t old_fs = get_fs();
644 int ret;
645 off_t of;
646
647 if (offset && get_user(of, offset))
648 return -EFAULT;
649
650 set_fs(KERNEL_DS);
651 ret = sys_sendfile(out_fd, in_fd,
652 offset ? (off_t __force __user *) &of : NULL, count);
653 set_fs(old_fs);
654
655 if (offset && put_user(of, offset))
656 return -EFAULT;
657
658 return ret;
659 }
660
661 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
662 compat_loff_t __user *offset, s32 count)
663 {
664 mm_segment_t old_fs = get_fs();
665 int ret;
666 loff_t lof;
667
668 if (offset && get_user(lof, offset))
669 return -EFAULT;
670
671 set_fs(KERNEL_DS);
672 ret = sys_sendfile64(out_fd, in_fd,
673 offset ? (loff_t __force __user *) &lof : NULL,
674 count);
675 set_fs(old_fs);
676
677 if (offset && put_user(lof, offset))
678 return -EFAULT;
679
680 return ret;
681 }
682
683 #ifdef CONFIG_SYSCTL_SYSCALL
684 struct __sysctl_args32 {
685 u32 name;
686 int nlen;
687 u32 oldval;
688 u32 oldlenp;
689 u32 newval;
690 u32 newlen;
691 u32 __unused[4];
692 };
693
694 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
695 {
696 struct __sysctl_args32 tmp;
697 int error;
698 size_t oldlen;
699 size_t __user *oldlenp = NULL;
700 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
701
702 if (copy_from_user(&tmp, args, sizeof(tmp)))
703 return -EFAULT;
704
705 if (tmp.oldval && tmp.oldlenp) {
706 /* Duh, this is ugly and might not work if sysctl_args
707 is in read-only memory, but do_sysctl does indirectly
708 a lot of uaccess in both directions and we'd have to
709 basically copy the whole sysctl.c here, and
710 glibc's __sysctl uses rw memory for the structure
711 anyway. */
712 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
713 put_user(oldlen, (size_t __user *)addr))
714 return -EFAULT;
715 oldlenp = (size_t __user *)addr;
716 }
717
718 lock_kernel();
719 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
720 oldlenp, compat_ptr(tmp.newval), tmp.newlen);
721 unlock_kernel();
722 if (oldlenp) {
723 if (!error) {
724 if (get_user(oldlen, (size_t __user *)addr) ||
725 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
726 error = -EFAULT;
727 }
728 if (copy_to_user(args->__unused, tmp.__unused,
729 sizeof(tmp.__unused)))
730 error = -EFAULT;
731 }
732 return error;
733 }
734 #endif
735
736 struct stat64_emu31 {
737 unsigned long long st_dev;
738 unsigned int __pad1;
739 #define STAT64_HAS_BROKEN_ST_INO 1
740 u32 __st_ino;
741 unsigned int st_mode;
742 unsigned int st_nlink;
743 u32 st_uid;
744 u32 st_gid;
745 unsigned long long st_rdev;
746 unsigned int __pad3;
747 long st_size;
748 u32 st_blksize;
749 unsigned char __pad4[4];
750 u32 __pad5; /* future possible st_blocks high bits */
751 u32 st_blocks; /* Number 512-byte blocks allocated. */
752 u32 st_atime;
753 u32 __pad6;
754 u32 st_mtime;
755 u32 __pad7;
756 u32 st_ctime;
757 u32 __pad8; /* will be high 32 bits of ctime someday */
758 unsigned long st_ino;
759 };
760
761 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
762 {
763 struct stat64_emu31 tmp;
764
765 memset(&tmp, 0, sizeof(tmp));
766
767 tmp.st_dev = huge_encode_dev(stat->dev);
768 tmp.st_ino = stat->ino;
769 tmp.__st_ino = (u32)stat->ino;
770 tmp.st_mode = stat->mode;
771 tmp.st_nlink = (unsigned int)stat->nlink;
772 tmp.st_uid = stat->uid;
773 tmp.st_gid = stat->gid;
774 tmp.st_rdev = huge_encode_dev(stat->rdev);
775 tmp.st_size = stat->size;
776 tmp.st_blksize = (u32)stat->blksize;
777 tmp.st_blocks = (u32)stat->blocks;
778 tmp.st_atime = (u32)stat->atime.tv_sec;
779 tmp.st_mtime = (u32)stat->mtime.tv_sec;
780 tmp.st_ctime = (u32)stat->ctime.tv_sec;
781
782 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
783 }
784
785 asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
786 {
787 struct kstat stat;
788 int ret = vfs_stat(filename, &stat);
789 if (!ret)
790 ret = cp_stat64(statbuf, &stat);
791 return ret;
792 }
793
794 asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
795 {
796 struct kstat stat;
797 int ret = vfs_lstat(filename, &stat);
798 if (!ret)
799 ret = cp_stat64(statbuf, &stat);
800 return ret;
801 }
802
803 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
804 {
805 struct kstat stat;
806 int ret = vfs_fstat(fd, &stat);
807 if (!ret)
808 ret = cp_stat64(statbuf, &stat);
809 return ret;
810 }
811
812 asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
813 struct stat64_emu31 __user* statbuf, int flag)
814 {
815 struct kstat stat;
816 int error = -EINVAL;
817
818 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
819 goto out;
820
821 if (flag & AT_SYMLINK_NOFOLLOW)
822 error = vfs_lstat_fd(dfd, filename, &stat);
823 else
824 error = vfs_stat_fd(dfd, filename, &stat);
825
826 if (!error)
827 error = cp_stat64(statbuf, &stat);
828 out:
829 return error;
830 }
831
832 /*
833 * Linux/i386 didn't use to be able to handle more than
834 * 4 system call parameters, so these system calls used a memory
835 * block for parameter passing..
836 */
837
838 struct mmap_arg_struct_emu31 {
839 u32 addr;
840 u32 len;
841 u32 prot;
842 u32 flags;
843 u32 fd;
844 u32 offset;
845 };
846
847 /* common code for old and new mmaps */
848 static inline long do_mmap2(
849 unsigned long addr, unsigned long len,
850 unsigned long prot, unsigned long flags,
851 unsigned long fd, unsigned long pgoff)
852 {
853 struct file * file = NULL;
854 unsigned long error = -EBADF;
855
856 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
857 if (!(flags & MAP_ANONYMOUS)) {
858 file = fget(fd);
859 if (!file)
860 goto out;
861 }
862
863 down_write(&current->mm->mmap_sem);
864 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
865 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
866 /* Result is out of bounds. */
867 do_munmap(current->mm, addr, len);
868 error = -ENOMEM;
869 }
870 up_write(&current->mm->mmap_sem);
871
872 if (file)
873 fput(file);
874 out:
875 return error;
876 }
877
878
879 asmlinkage unsigned long
880 old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
881 {
882 struct mmap_arg_struct_emu31 a;
883 int error = -EFAULT;
884
885 if (copy_from_user(&a, arg, sizeof(a)))
886 goto out;
887
888 error = -EINVAL;
889 if (a.offset & ~PAGE_MASK)
890 goto out;
891
892 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
893 out:
894 return error;
895 }
896
897 asmlinkage long
898 sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
899 {
900 struct mmap_arg_struct_emu31 a;
901 int error = -EFAULT;
902
903 if (copy_from_user(&a, arg, sizeof(a)))
904 goto out;
905 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
906 out:
907 return error;
908 }
909
910 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
911 {
912 if ((compat_ssize_t) count < 0)
913 return -EINVAL;
914
915 return sys_read(fd, buf, count);
916 }
917
918 asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
919 {
920 if ((compat_ssize_t) count < 0)
921 return -EINVAL;
922
923 return sys_write(fd, buf, count);
924 }
925
926 asmlinkage long sys32_clone(void)
927 {
928 struct pt_regs *regs = task_pt_regs(current);
929 unsigned long clone_flags;
930 unsigned long newsp;
931 int __user *parent_tidptr, *child_tidptr;
932
933 clone_flags = regs->gprs[3] & 0xffffffffUL;
934 newsp = regs->orig_gpr2 & 0x7fffffffUL;
935 parent_tidptr = compat_ptr(regs->gprs[4]);
936 child_tidptr = compat_ptr(regs->gprs[5]);
937 if (!newsp)
938 newsp = regs->gprs[15];
939 return do_fork(clone_flags, newsp, regs, 0,
940 parent_tidptr, child_tidptr);
941 }
942
943 /*
944 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
945 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
946 * because the 31 bit values differ from the 64 bit values.
947 */
948
949 asmlinkage long
950 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
951 {
952 if (advise == 4)
953 advise = POSIX_FADV_DONTNEED;
954 else if (advise == 5)
955 advise = POSIX_FADV_NOREUSE;
956 return sys_fadvise64(fd, offset, len, advise);
957 }
958
959 struct fadvise64_64_args {
960 int fd;
961 long long offset;
962 long long len;
963 int advice;
964 };
965
966 asmlinkage long
967 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
968 {
969 struct fadvise64_64_args a;
970
971 if ( copy_from_user(&a, args, sizeof(a)) )
972 return -EFAULT;
973 if (a.advice == 4)
974 a.advice = POSIX_FADV_DONTNEED;
975 else if (a.advice == 5)
976 a.advice = POSIX_FADV_NOREUSE;
977 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
978 }
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