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[deliverable/linux.git] / arch / s390 / kernel / compat_linux.c
CommitLineData
1da177e4
LT		 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
1da177e4
LT		 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>
1da177e4
LT		 27#include <linux/smp.h>
28#include <linux/smp_lock.h>
29#include <linux/sem.h>
30#include <linux/msg.h>
31#include <linux/shm.h>
32#include <linux/slab.h>
33#include <linux/uio.h>
34#include <linux/nfs_fs.h>
35#include <linux/quota.h>
36#include <linux/module.h>
37#include <linux/sunrpc/svc.h>
38#include <linux/nfsd/nfsd.h>
39#include <linux/nfsd/cache.h>
40#include <linux/nfsd/xdr.h>
41#include <linux/nfsd/syscall.h>
42#include <linux/poll.h>
43#include <linux/personality.h>
44#include <linux/stat.h>
45#include <linux/filter.h>
46#include <linux/highmem.h>
47#include <linux/highuid.h>
48#include <linux/mman.h>
49#include <linux/ipv6.h>
50#include <linux/in.h>
51#include <linux/icmpv6.h>
52#include <linux/syscalls.h>
53#include <linux/sysctl.h>
54#include <linux/binfmts.h>
a9415644 55#include <linux/capability.h>
1da177e4
LT		 56#include <linux/compat.h>
57#include <linux/vfs.h>
58#include <linux/ptrace.h>
068e1b94 59#include <linux/fadvise.h>
cba4fbbf 60#include <linux/ipc.h>
1da177e4
LT		 61
62#include <asm/types.h>
1da177e4 63#include <asm/uaccess.h>
1da177e4
LT		 64
65#include <net/scm.h>
66#include <net/sock.h>
67
68#include "compat_linux.h"
69
c1821c2e
GS		 70long psw_user32_bits = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
71 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
72 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
73long psw32_user_bits = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
74 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
75 PSW32_MASK_PSTATE);
1da177e4
LT		 76
77/* For this source file, we want overflow handling. */
78
79#undef high2lowuid
80#undef high2lowgid
81#undef low2highuid
82#undef low2highgid
83#undef SET_UID16
84#undef SET_GID16
85#undef NEW_TO_OLD_UID
86#undef NEW_TO_OLD_GID
87#undef SET_OLDSTAT_UID
88#undef SET_OLDSTAT_GID
89#undef SET_STAT_UID
90#undef SET_STAT_GID
91
92#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
93#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
94#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
95#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
96#define SET_UID16(var, uid) var = high2lowuid(uid)
97#define SET_GID16(var, gid) var = high2lowgid(gid)
98#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
99#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
100#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
101#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
102#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
103#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
104
24954a14 105asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
1da177e4
LT		 106{
107 return sys_chown(filename, low2highuid(user), low2highgid(group));
108}
109
24954a14 110asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
1da177e4
LT		 111{
112 return sys_lchown(filename, low2highuid(user), low2highgid(group));
113}
114
115asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
116{
117 return sys_fchown(fd, low2highuid(user), low2highgid(group));
118}
119
120asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
121{
122 return sys_setregid(low2highgid(rgid), low2highgid(egid));
123}
124
125asmlinkage long sys32_setgid16(u16 gid)
126{
127 return sys_setgid((gid_t)gid);
128}
129
130asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
131{
132 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
133}
134
135asmlinkage long sys32_setuid16(u16 uid)
136{
137 return sys_setuid((uid_t)uid);
138}
139
140asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
141{
142 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
143 low2highuid(suid));
144}
145
24954a14 146asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
1da177e4
LT		 147{
148 int retval;
149
b6dff3ec
DH		 150 if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
151 !(retval = put_user(high2lowuid(current->cred->euid), euid)))
152 retval = put_user(high2lowuid(current->cred->suid), suid);
1da177e4
LT		 153
154 return retval;
155}
156
157asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
158{
159 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
160 low2highgid(sgid));
161}
162
24954a14 163asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
1da177e4
LT		 164{
165 int retval;
166
b6dff3ec
DH		 167 if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
168 !(retval = put_user(high2lowgid(current->cred->egid), egid)))
169 retval = put_user(high2lowgid(current->cred->sgid), sgid);
1da177e4
LT		 170
171 return retval;
172}
173
174asmlinkage long sys32_setfsuid16(u16 uid)
175{
176 return sys_setfsuid((uid_t)uid);
177}
178
179asmlinkage long sys32_setfsgid16(u16 gid)
180{
181 return sys_setfsgid((gid_t)gid);
182}
183
24954a14 184static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
1da177e4
LT		 185{
186 int i;
187 u16 group;
188
189 for (i = 0; i < group_info->ngroups; i++) {
190 group = (u16)GROUP_AT(group_info, i);
191 if (put_user(group, grouplist+i))
192 return -EFAULT;
193 }
194
195 return 0;
196}
197
24954a14 198static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
1da177e4
LT		 199{
200 int i;
201 u16 group;
202
203 for (i = 0; i < group_info->ngroups; i++) {
204 if (get_user(group, grouplist+i))
205 return -EFAULT;
206 GROUP_AT(group_info, i) = (gid_t)group;
207 }
208
209 return 0;
210}
211
24954a14 212asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4
LT		 213{
214 int i;
215
216 if (gidsetsize < 0)
217 return -EINVAL;
218
b6dff3ec
DH		 219 get_group_info(current->cred->group_info);
220 i = current->cred->group_info->ngroups;
1da177e4
LT		 221 if (gidsetsize) {
222 if (i > gidsetsize) {
223 i = -EINVAL;
224 goto out;
225 }
b6dff3ec 226 if (groups16_to_user(grouplist, current->cred->group_info)) {
1da177e4
LT		 227 i = -EFAULT;
228 goto out;
229 }
230 }
231out:
b6dff3ec 232 put_group_info(current->cred->group_info);
1da177e4
LT		 233 return i;
234}
235
24954a14 236asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4
LT		 237{
238 struct group_info *group_info;
239 int retval;
240
241 if (!capable(CAP_SETGID))
242 return -EPERM;
243 if ((unsigned)gidsetsize > NGROUPS_MAX)
244 return -EINVAL;
245
246 group_info = groups_alloc(gidsetsize);
247 if (!group_info)
248 return -ENOMEM;
249 retval = groups16_from_user(group_info, grouplist);
250 if (retval) {
251 put_group_info(group_info);
252 return retval;
253 }
254
255 retval = set_current_groups(group_info);
256 put_group_info(group_info);
257
258 return retval;
259}
260
261asmlinkage long sys32_getuid16(void)
262{
b6dff3ec 263 return high2lowuid(current->cred->uid);
1da177e4
LT		 264}
265
266asmlinkage long sys32_geteuid16(void)
267{
b6dff3ec 268 return high2lowuid(current->cred->euid);
1da177e4
LT		 269}
270
271asmlinkage long sys32_getgid16(void)
272{
b6dff3ec 273 return high2lowgid(current->cred->gid);
1da177e4
LT		 274}
275
276asmlinkage long sys32_getegid16(void)
277{
b6dff3ec 278 return high2lowgid(current->cred->egid);
1da177e4
LT		 279}
280
1da177e4
LT		 281/*
282 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
283 *
284 * This is really horribly ugly.
285 */
1df23957 286#ifdef CONFIG_SYSVIPC
1da177e4
LT		 287asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
288{
289 if (call >> 16) /* hack for backward compatibility */
290 return -EINVAL;
291
292 call &= 0xffff;
293
294 switch (call) {
295 case SEMTIMEDOP:
296 return compat_sys_semtimedop(first, compat_ptr(ptr),
297 second, compat_ptr(third));
298 case SEMOP:
299 /* struct sembuf is the same on 32 and 64bit :)) */
300 return sys_semtimedop(first, compat_ptr(ptr),
301 second, NULL);
302 case SEMGET:
303 return sys_semget(first, second, third);
304 case SEMCTL:
305 return compat_sys_semctl(first, second, third,
306 compat_ptr(ptr));
307 case MSGSND:
308 return compat_sys_msgsnd(first, second, third,
309 compat_ptr(ptr));
310 case MSGRCV:
311 return compat_sys_msgrcv(first, second, 0, third,
312 0, compat_ptr(ptr));
313 case MSGGET:
314 return sys_msgget((key_t) first, second);
315 case MSGCTL:
316 return compat_sys_msgctl(first, second, compat_ptr(ptr));
317 case SHMAT:
318 return compat_sys_shmat(first, second, third,
319 0, compat_ptr(ptr));
320 case SHMDT:
321 return sys_shmdt(compat_ptr(ptr));
322 case SHMGET:
323 return sys_shmget(first, (unsigned)second, third);
324 case SHMCTL:
325 return compat_sys_shmctl(first, second, compat_ptr(ptr));
326 }
327
328 return -ENOSYS;
329}
1df23957 330#endif
1da177e4 331
24954a14 332asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
1da177e4
LT		 333{
334 if ((int)high < 0)
335 return -EINVAL;
336 else
337 return sys_truncate(path, (high << 32) | low);
338}
339
340asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
341{
342 if ((int)high < 0)
343 return -EINVAL;
344 else
345 return sys_ftruncate(fd, (high << 32) | low);
346}
347
1da177e4
LT		 348asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
349 struct compat_timespec __user *interval)
350{
351 struct timespec t;
352 int ret;
353 mm_segment_t old_fs = get_fs ();
354
355 set_fs (KERNEL_DS);
2b67fc46
HC		 356 ret = sys_sched_rr_get_interval(pid,
357 (struct timespec __force __user *) &t);
1da177e4
LT		 358 set_fs (old_fs);
359 if (put_compat_timespec(&t, interval))
360 return -EFAULT;
361 return ret;
362}
363
364asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
365 compat_sigset_t __user *oset, size_t sigsetsize)
366{
367 sigset_t s;
368 compat_sigset_t s32;
369 int ret;
370 mm_segment_t old_fs = get_fs();
371
372 if (set) {
373 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
374 return -EFAULT;
375 switch (_NSIG_WORDS) {
376 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
377 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
378 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
379 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
380 }
381 }
382 set_fs (KERNEL_DS);
d2c993d8 383 ret = sys_rt_sigprocmask(how,
2b67fc46
HC		 384 set ? (sigset_t __force __user *) &s : NULL,
385 oset ? (sigset_t __force __user *) &s : NULL,
d2c993d8 386 sigsetsize);
1da177e4
LT		 387 set_fs (old_fs);
388 if (ret) return ret;
389 if (oset) {
390 switch (_NSIG_WORDS) {
391 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
392 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
393 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
394 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
395 }
396 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
397 return -EFAULT;
398 }
399 return 0;
400}
401
402asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
403 size_t sigsetsize)
404{
405 sigset_t s;
406 compat_sigset_t s32;
407 int ret;
408 mm_segment_t old_fs = get_fs();
409
410 set_fs (KERNEL_DS);
2b67fc46 411 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
1da177e4
LT		 412 set_fs (old_fs);
413 if (!ret) {
414 switch (_NSIG_WORDS) {
415 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
416 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
417 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
418 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
419 }
420 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
421 return -EFAULT;
422 }
423 return ret;
424}
425
426asmlinkage long
427sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
428{
429 siginfo_t info;
430 int ret;
431 mm_segment_t old_fs = get_fs();
432
433 if (copy_siginfo_from_user32(&info, uinfo))
434 return -EFAULT;
435 set_fs (KERNEL_DS);
2b67fc46 436 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
1da177e4
LT		 437 set_fs (old_fs);
438 return ret;
439}
440
441/*
442 * sys32_execve() executes a new program after the asm stub has set
443 * things up for us. This should basically do what I want it to.
444 */
3e86a8c6
HC		 445asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
446 compat_uptr_t __user *envp)
1da177e4 447{
03ff9a23
MS		 448 struct pt_regs *regs = task_pt_regs(current);
449 char *filename;
3e86a8c6
HC		 450 long rc;
451
452 filename = getname(name);
453 rc = PTR_ERR(filename);
454 if (IS_ERR(filename))
455 return rc;
456 rc = compat_do_execve(filename, argv, envp, regs);
457 if (rc)
458 goto out;
03ff9a23
MS		 459 current->thread.fp_regs.fpc=0;
460 asm volatile("sfpc %0,0" : : "d" (0));
3e86a8c6 461 rc = regs->gprs[2];
1da177e4 462out:
3e86a8c6
HC		 463 putname(filename);
464 return rc;
1da177e4
LT		 465}
466
24954a14 467asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
1da177e4
LT		 468 size_t count, u32 poshi, u32 poslo)
469{
470 if ((compat_ssize_t) count < 0)
471 return -EINVAL;
472 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
473}
474
24954a14 475asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
1da177e4
LT		 476 size_t count, u32 poshi, u32 poslo)
477{
478 if ((compat_ssize_t) count < 0)
479 return -EINVAL;
480 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
481}
482
483asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
484{
485 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
486}
487
24954a14 488asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
1da177e4
LT		 489{
490 mm_segment_t old_fs = get_fs();
491 int ret;
492 off_t of;
493
494 if (offset && get_user(of, offset))
495 return -EFAULT;
496
497 set_fs(KERNEL_DS);
d2c993d8 498 ret = sys_sendfile(out_fd, in_fd,
2b67fc46 499 offset ? (off_t __force __user *) &of : NULL, count);
1da177e4
LT		 500 set_fs(old_fs);
501
83b942bd 502 if (offset && put_user(of, offset))
1da177e4
LT		 503 return -EFAULT;
504
505 return ret;
506}
507
508asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
24954a14 509 compat_loff_t __user *offset, s32 count)
1da177e4
LT		 510{
511 mm_segment_t old_fs = get_fs();
512 int ret;
513 loff_t lof;
514
515 if (offset && get_user(lof, offset))
516 return -EFAULT;
517
518 set_fs(KERNEL_DS);
d2c993d8 519 ret = sys_sendfile64(out_fd, in_fd,
2b67fc46
HC		 520 offset ? (loff_t __force __user *) &lof : NULL,
521 count);
1da177e4
LT		 522 set_fs(old_fs);
523
524 if (offset && put_user(lof, offset))
525 return -EFAULT;
526
527 return ret;
528}
529
b89a8171 530#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 531struct __sysctl_args32 {
532 u32 name;
533 int nlen;
534 u32 oldval;
535 u32 oldlenp;
536 u32 newval;
537 u32 newlen;
538 u32 __unused[4];
539};
540
24954a14 541asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
1da177e4
LT		 542{
543 struct __sysctl_args32 tmp;
544 int error;
24954a14
AV		 545 size_t oldlen;
546 size_t __user *oldlenp = NULL;
547 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
1da177e4
LT		 548
549 if (copy_from_user(&tmp, args, sizeof(tmp)))
550 return -EFAULT;
551
552 if (tmp.oldval && tmp.oldlenp) {
553 /* Duh, this is ugly and might not work if sysctl_args
554 is in read-only memory, but do_sysctl does indirectly
555 a lot of uaccess in both directions and we'd have to
556 basically copy the whole sysctl.c here, and
557 glibc's __sysctl uses rw memory for the structure
558 anyway. */
24954a14
AV		 559 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
560 put_user(oldlen, (size_t __user *)addr))
1da177e4 561 return -EFAULT;
24954a14 562 oldlenp = (size_t __user *)addr;
1da177e4
LT		 563 }
564
565 lock_kernel();
24954a14
AV		 566 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
567 oldlenp, compat_ptr(tmp.newval), tmp.newlen);
1da177e4
LT		 568 unlock_kernel();
569 if (oldlenp) {
570 if (!error) {
24954a14
AV		 571 if (get_user(oldlen, (size_t __user *)addr) ||
572 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
1da177e4
LT		 573 error = -EFAULT;
574 }
12bae235
HC		 575 if (copy_to_user(args->__unused, tmp.__unused,
576 sizeof(tmp.__unused)))
577 error = -EFAULT;
1da177e4
LT		 578 }
579 return error;
580}
581#endif
582
583struct stat64_emu31 {
584 unsigned long long st_dev;
585 unsigned int __pad1;
586#define STAT64_HAS_BROKEN_ST_INO 1
587 u32 __st_ino;
588 unsigned int st_mode;
589 unsigned int st_nlink;
590 u32 st_uid;
591 u32 st_gid;
592 unsigned long long st_rdev;
593 unsigned int __pad3;
594 long st_size;
595 u32 st_blksize;
596 unsigned char __pad4[4];
597 u32 __pad5; /* future possible st_blocks high bits */
598 u32 st_blocks; /* Number 512-byte blocks allocated. */
599 u32 st_atime;
600 u32 __pad6;
601 u32 st_mtime;
602 u32 __pad7;
603 u32 st_ctime;
604 u32 __pad8; /* will be high 32 bits of ctime someday */
605 unsigned long st_ino;
606};
607
24954a14 608static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
1da177e4
LT		 609{
610 struct stat64_emu31 tmp;
611
612 memset(&tmp, 0, sizeof(tmp));
613
614 tmp.st_dev = huge_encode_dev(stat->dev);
615 tmp.st_ino = stat->ino;
616 tmp.__st_ino = (u32)stat->ino;
617 tmp.st_mode = stat->mode;
618 tmp.st_nlink = (unsigned int)stat->nlink;
619 tmp.st_uid = stat->uid;
620 tmp.st_gid = stat->gid;
621 tmp.st_rdev = huge_encode_dev(stat->rdev);
622 tmp.st_size = stat->size;
623 tmp.st_blksize = (u32)stat->blksize;
624 tmp.st_blocks = (u32)stat->blocks;
625 tmp.st_atime = (u32)stat->atime.tv_sec;
626 tmp.st_mtime = (u32)stat->mtime.tv_sec;
627 tmp.st_ctime = (u32)stat->ctime.tv_sec;
628
629 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
630}
631
24954a14 632asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4
LT		 633{
634 struct kstat stat;
635 int ret = vfs_stat(filename, &stat);
636 if (!ret)
637 ret = cp_stat64(statbuf, &stat);
638 return ret;
639}
640
24954a14 641asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4
LT		 642{
643 struct kstat stat;
644 int ret = vfs_lstat(filename, &stat);
645 if (!ret)
646 ret = cp_stat64(statbuf, &stat);
647 return ret;
648}
649
24954a14 650asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
1da177e4
LT		 651{
652 struct kstat stat;
653 int ret = vfs_fstat(fd, &stat);
654 if (!ret)
655 ret = cp_stat64(statbuf, &stat);
656 return ret;
657}
658
ed3d021b
HC		 659asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
660 struct stat64_emu31 __user* statbuf, int flag)
19bf9cbf
HC		 661{
662 struct kstat stat;
0112fc22 663 int error;
19bf9cbf 664
0112fc22
OD		 665 error = vfs_fstatat(dfd, filename, &stat, flag);
666 if (error)
667 return error;
668 return cp_stat64(statbuf, &stat);
19bf9cbf
HC		 669}
670
1da177e4
LT		 671/*
672 * Linux/i386 didn't use to be able to handle more than
673 * 4 system call parameters, so these system calls used a memory
674 * block for parameter passing..
675 */
676
677struct mmap_arg_struct_emu31 {
678 u32 addr;
679 u32 len;
680 u32 prot;
681 u32 flags;
682 u32 fd;
683 u32 offset;
684};
685
686/* common code for old and new mmaps */
687static inline long do_mmap2(
688 unsigned long addr, unsigned long len,
689 unsigned long prot, unsigned long flags,
690 unsigned long fd, unsigned long pgoff)
691{
692 struct file * file = NULL;
693 unsigned long error = -EBADF;
694
695 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
696 if (!(flags & MAP_ANONYMOUS)) {
697 file = fget(fd);
698 if (!file)
699 goto out;
700 }
701
702 down_write(&current->mm->mmap_sem);
703 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
704 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
705 /* Result is out of bounds. */
706 do_munmap(current->mm, addr, len);
707 error = -ENOMEM;
708 }
709 up_write(&current->mm->mmap_sem);
710
711 if (file)
712 fput(file);
713out:
714 return error;
715}
716
717
718asmlinkage unsigned long
24954a14 719old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
1da177e4
LT		 720{
721 struct mmap_arg_struct_emu31 a;
722 int error = -EFAULT;
723
724 if (copy_from_user(&a, arg, sizeof(a)))
725 goto out;
726
727 error = -EINVAL;
728 if (a.offset & ~PAGE_MASK)
729 goto out;
730
731 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
732out:
733 return error;
734}
735
736asmlinkage long
24954a14 737sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
1da177e4
LT		 738{
739 struct mmap_arg_struct_emu31 a;
740 int error = -EFAULT;
741
742 if (copy_from_user(&a, arg, sizeof(a)))
743 goto out;
744 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
745out:
746 return error;
747}
748
24954a14 749asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
1da177e4
LT		 750{
751 if ((compat_ssize_t) count < 0)
752 return -EINVAL;
753
754 return sys_read(fd, buf, count);
755}
756
24954a14 757asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
1da177e4
LT		 758{
759 if ((compat_ssize_t) count < 0)
760 return -EINVAL;
761
762 return sys_write(fd, buf, count);
763}
764
068e1b94
MS		 765/*
766 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
767 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
768 * because the 31 bit values differ from the 64 bit values.
769 */
770
771asmlinkage long
772sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
773{
774 if (advise == 4)
775 advise = POSIX_FADV_DONTNEED;
776 else if (advise == 5)
777 advise = POSIX_FADV_NOREUSE;
778 return sys_fadvise64(fd, offset, len, advise);
779}
780
781struct fadvise64_64_args {
782 int fd;
783 long long offset;
784 long long len;
785 int advice;
786};
787
788asmlinkage long
789sys32_fadvise64_64(struct fadvise64_64_args __user *args)
790{
791 struct fadvise64_64_args a;
792
793 if ( copy_from_user(&a, args, sizeof(a)) )
794 return -EFAULT;
795 if (a.advice == 4)
796 a.advice = POSIX_FADV_DONTNEED;
797 else if (a.advice == 5)
798 a.advice = POSIX_FADV_NOREUSE;
799 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
800}
Linux kernel - Deliverables
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