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Merge git://git.kernel.org/pub/scm/linux/kernel/git/hskinnemoen/avr32-2.6
[linux-2.6-block.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>
27#include <linux/utsname.h>
1da177e4
LT		 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>
a9415644 56#include <linux/capability.h>
1da177e4
LT		 57#include <linux/compat.h>
58#include <linux/vfs.h>
59#include <linux/ptrace.h>
068e1b94 60#include <linux/fadvise.h>
cba4fbbf 61#include <linux/ipc.h>
1da177e4
LT		 62
63#include <asm/types.h>
1da177e4 64#include <asm/uaccess.h>
1da177e4
LT		 65
66#include <net/scm.h>
67#include <net/sock.h>
68
69#include "compat_linux.h"
70
c1821c2e
GS		 71long 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);
74long 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);
1da177e4
LT		 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
24954a14 106asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
1da177e4
LT		 107{
108 return sys_chown(filename, low2highuid(user), low2highgid(group));
109}
110
24954a14 111asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
1da177e4
LT		 112{
113 return sys_lchown(filename, low2highuid(user), low2highgid(group));
114}
115
116asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
117{
118 return sys_fchown(fd, low2highuid(user), low2highgid(group));
119}
120
121asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
122{
123 return sys_setregid(low2highgid(rgid), low2highgid(egid));
124}
125
126asmlinkage long sys32_setgid16(u16 gid)
127{
128 return sys_setgid((gid_t)gid);
129}
130
131asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
132{
133 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
134}
135
136asmlinkage long sys32_setuid16(u16 uid)
137{
138 return sys_setuid((uid_t)uid);
139}
140
141asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
142{
143 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
144 low2highuid(suid));
145}
146
24954a14 147asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
1da177e4
LT		 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
158asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
159{
160 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
161 low2highgid(sgid));
162}
163
24954a14 164asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
1da177e4
LT		 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
175asmlinkage long sys32_setfsuid16(u16 uid)
176{
177 return sys_setfsuid((uid_t)uid);
178}
179
180asmlinkage long sys32_setfsgid16(u16 gid)
181{
182 return sys_setfsgid((gid_t)gid);
183}
184
24954a14 185static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
1da177e4
LT		 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
24954a14 199static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
1da177e4
LT		 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
24954a14 213asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4
LT		 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 }
232out:
233 put_group_info(current->group_info);
234 return i;
235}
236
24954a14 237asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
1da177e4
LT		 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
262asmlinkage long sys32_getuid16(void)
263{
264 return high2lowuid(current->uid);
265}
266
267asmlinkage long sys32_geteuid16(void)
268{
269 return high2lowuid(current->euid);
270}
271
272asmlinkage long sys32_getgid16(void)
273{
274 return high2lowgid(current->gid);
275}
276
277asmlinkage long sys32_getegid16(void)
278{
279 return high2lowgid(current->egid);
280}
281
282/* 32-bit timeval and related flotsam. */
283
24954a14 284static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i)
1da177e4 285{
a63a4931 286 return (!access_ok(VERIFY_READ, o, sizeof(*o)) ||
1da177e4
LT		 287 (__get_user(o->tv_sec, &i->tv_sec) ||
288 __get_user(o->tv_usec, &i->tv_usec)));
289}
290
24954a14 291static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
1da177e4
LT		 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 */
1df23957 303#ifdef CONFIG_SYSVIPC
1da177e4
LT		 304asmlinkage 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}
1df23957 347#endif
1da177e4 348
24954a14 349asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
1da177e4
LT		 350{
351 if ((int)high < 0)
352 return -EINVAL;
353 else
354 return sys_truncate(path, (high << 32) | low);
355}
356
357asmlinkage 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
24954a14 365int cp_compat_stat(struct kstat *stat, struct compat_stat __user *statbuf)
1da177e4 366{
afefdbb2 367 compat_ino_t ino;
1da177e4
LT		 368 int err;
369
370 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
371 return -EOVERFLOW;
372
afefdbb2
DH		 373 ino = stat->ino;
374 if (sizeof(ino) < sizeof(stat->ino) && ino != stat->ino)
375 return -EOVERFLOW;
376
1da177e4
LT		 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
1da177e4
LT		 400asmlinkage 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);
2b67fc46
HC		 408 ret = sys_sched_rr_get_interval(pid,
409 (struct timespec __force __user *) &t);
1da177e4
LT		 410 set_fs (old_fs);
411 if (put_compat_timespec(&t, interval))
412 return -EFAULT;
413 return ret;
414}
415
416asmlinkage 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);
d2c993d8 435 ret = sys_rt_sigprocmask(how,
2b67fc46
HC		 436 set ? (sigset_t __force __user *) &s : NULL,
437 oset ? (sigset_t __force __user *) &s : NULL,
d2c993d8 438 sigsetsize);
1da177e4
LT		 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
454asmlinkage 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);
2b67fc46 463 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
1da177e4
LT		 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
478asmlinkage long
479sys32_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);
2b67fc46 488 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
1da177e4
LT		 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 */
03ff9a23 497asmlinkage long sys32_execve(void)
1da177e4 498{
03ff9a23
MS		 499 struct pt_regs *regs = task_pt_regs(current);
500 char *filename;
501 unsigned long result;
502 int rc;
1da177e4 503
03ff9a23
MS		 504 filename = getname(compat_ptr(regs->orig_gpr2));
505 if (IS_ERR(filename)) {
506 result = PTR_ERR(filename);
1da177e4 507 goto out;
1da177e4 508 }
03ff9a23
MS		 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];
521out_putname:
1da177e4
LT		 522 putname(filename);
523out:
03ff9a23 524 return result;
1da177e4
LT		 525}
526
527
528#ifdef CONFIG_MODULES
529
530asmlinkage long
531sys32_init_module(void __user *umod, unsigned long len,
532 const char __user *uargs)
533{
534 return sys_init_module(umod, len, uargs);
535}
536
537asmlinkage long
538sys32_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
545asmlinkage long
546sys32_init_module(void __user *umod, unsigned long len,
547 const char __user *uargs)
548{
549 return -ENOSYS;
550}
551
552asmlinkage long
553sys32_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
563extern struct timezone sys_tz;
564
24954a14 565asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
1da177e4
LT		 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
24954a14 580static inline long get_ts32(struct timespec *o, struct compat_timeval __user *i)
1da177e4
LT		 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
24954a14 594asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv, struct timezone __user *tz)
1da177e4
LT		 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
24954a14 611asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
1da177e4
LT		 612 size_t count, u32 poshi, u32 poslo)
613{
614 if ((compat_ssize_t) count < 0)
615 return -EINVAL;
616 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
617}
618
24954a14 619asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
1da177e4
LT		 620 size_t count, u32 poshi, u32 poslo)
621{
622 if ((compat_ssize_t) count < 0)
623 return -EINVAL;
624 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
625}
626
627asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
628{
629 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
630}
631
24954a14 632asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
1da177e4
LT		 633{
634 mm_segment_t old_fs = get_fs();
635 int ret;
636 off_t of;
637
638 if (offset && get_user(of, offset))
639 return -EFAULT;
640
641 set_fs(KERNEL_DS);
d2c993d8 642 ret = sys_sendfile(out_fd, in_fd,
2b67fc46 643 offset ? (off_t __force __user *) &of : NULL, count);
1da177e4
LT		 644 set_fs(old_fs);
645
83b942bd 646 if (offset && put_user(of, offset))
1da177e4
LT		 647 return -EFAULT;
648
649 return ret;
650}
651
652asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
24954a14 653 compat_loff_t __user *offset, s32 count)
1da177e4
LT		 654{
655 mm_segment_t old_fs = get_fs();
656 int ret;
657 loff_t lof;
658
659 if (offset && get_user(lof, offset))
660 return -EFAULT;
661
662 set_fs(KERNEL_DS);
d2c993d8 663 ret = sys_sendfile64(out_fd, in_fd,
2b67fc46
HC		 664 offset ? (loff_t __force __user *) &lof : NULL,
665 count);
1da177e4
LT		 666 set_fs(old_fs);
667
668 if (offset && put_user(lof, offset))
669 return -EFAULT;
670
671 return ret;
672}
673
b89a8171 674#ifdef CONFIG_SYSCTL_SYSCALL
1da177e4
LT		 675struct __sysctl_args32 {
676 u32 name;
677 int nlen;
678 u32 oldval;
679 u32 oldlenp;
680 u32 newval;
681 u32 newlen;
682 u32 __unused[4];
683};
684
24954a14 685asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
1da177e4
LT		 686{
687 struct __sysctl_args32 tmp;
688 int error;
24954a14
AV		 689 size_t oldlen;
690 size_t __user *oldlenp = NULL;
691 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
1da177e4
LT		 692
693 if (copy_from_user(&tmp, args, sizeof(tmp)))
694 return -EFAULT;
695
696 if (tmp.oldval && tmp.oldlenp) {
697 /* Duh, this is ugly and might not work if sysctl_args
698 is in read-only memory, but do_sysctl does indirectly
699 a lot of uaccess in both directions and we'd have to
700 basically copy the whole sysctl.c here, and
701 glibc's __sysctl uses rw memory for the structure
702 anyway. */
24954a14
AV		 703 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
704 put_user(oldlen, (size_t __user *)addr))
1da177e4 705 return -EFAULT;
24954a14 706 oldlenp = (size_t __user *)addr;
1da177e4
LT		 707 }
708
709 lock_kernel();
24954a14
AV		 710 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
711 oldlenp, compat_ptr(tmp.newval), tmp.newlen);
1da177e4
LT		 712 unlock_kernel();
713 if (oldlenp) {
714 if (!error) {
24954a14
AV		 715 if (get_user(oldlen, (size_t __user *)addr) ||
716 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
1da177e4
LT		 717 error = -EFAULT;
718 }
12bae235
HC		 719 if (copy_to_user(args->__unused, tmp.__unused,
720 sizeof(tmp.__unused)))
721 error = -EFAULT;
1da177e4
LT		 722 }
723 return error;
724}
725#endif
726
727struct stat64_emu31 {
728 unsigned long long st_dev;
729 unsigned int __pad1;
730#define STAT64_HAS_BROKEN_ST_INO 1
731 u32 __st_ino;
732 unsigned int st_mode;
733 unsigned int st_nlink;
734 u32 st_uid;
735 u32 st_gid;
736 unsigned long long st_rdev;
737 unsigned int __pad3;
738 long st_size;
739 u32 st_blksize;
740 unsigned char __pad4[4];
741 u32 __pad5; /* future possible st_blocks high bits */
742 u32 st_blocks; /* Number 512-byte blocks allocated. */
743 u32 st_atime;
744 u32 __pad6;
745 u32 st_mtime;
746 u32 __pad7;
747 u32 st_ctime;
748 u32 __pad8; /* will be high 32 bits of ctime someday */
749 unsigned long st_ino;
750};
751
24954a14 752static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
1da177e4
LT		 753{
754 struct stat64_emu31 tmp;
755
756 memset(&tmp, 0, sizeof(tmp));
757
758 tmp.st_dev = huge_encode_dev(stat->dev);
759 tmp.st_ino = stat->ino;
760 tmp.__st_ino = (u32)stat->ino;
761 tmp.st_mode = stat->mode;
762 tmp.st_nlink = (unsigned int)stat->nlink;
763 tmp.st_uid = stat->uid;
764 tmp.st_gid = stat->gid;
765 tmp.st_rdev = huge_encode_dev(stat->rdev);
766 tmp.st_size = stat->size;
767 tmp.st_blksize = (u32)stat->blksize;
768 tmp.st_blocks = (u32)stat->blocks;
769 tmp.st_atime = (u32)stat->atime.tv_sec;
770 tmp.st_mtime = (u32)stat->mtime.tv_sec;
771 tmp.st_ctime = (u32)stat->ctime.tv_sec;
772
773 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
774}
775
24954a14 776asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4
LT		 777{
778 struct kstat stat;
779 int ret = vfs_stat(filename, &stat);
780 if (!ret)
781 ret = cp_stat64(statbuf, &stat);
782 return ret;
783}
784
24954a14 785asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
1da177e4
LT		 786{
787 struct kstat stat;
788 int ret = vfs_lstat(filename, &stat);
789 if (!ret)
790 ret = cp_stat64(statbuf, &stat);
791 return ret;
792}
793
24954a14 794asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
1da177e4
LT		 795{
796 struct kstat stat;
797 int ret = vfs_fstat(fd, &stat);
798 if (!ret)
799 ret = cp_stat64(statbuf, &stat);
800 return ret;
801}
802
ed3d021b
HC		 803asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
804 struct stat64_emu31 __user* statbuf, int flag)
19bf9cbf
HC		 805{
806 struct kstat stat;
807 int error = -EINVAL;
808
809 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
810 goto out;
811
812 if (flag & AT_SYMLINK_NOFOLLOW)
813 error = vfs_lstat_fd(dfd, filename, &stat);
814 else
815 error = vfs_stat_fd(dfd, filename, &stat);
816
817 if (!error)
818 error = cp_stat64(statbuf, &stat);
819out:
820 return error;
821}
822
1da177e4
LT		 823/*
824 * Linux/i386 didn't use to be able to handle more than
825 * 4 system call parameters, so these system calls used a memory
826 * block for parameter passing..
827 */
828
829struct mmap_arg_struct_emu31 {
830 u32 addr;
831 u32 len;
832 u32 prot;
833 u32 flags;
834 u32 fd;
835 u32 offset;
836};
837
838/* common code for old and new mmaps */
839static inline long do_mmap2(
840 unsigned long addr, unsigned long len,
841 unsigned long prot, unsigned long flags,
842 unsigned long fd, unsigned long pgoff)
843{
844 struct file * file = NULL;
845 unsigned long error = -EBADF;
846
847 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
848 if (!(flags & MAP_ANONYMOUS)) {
849 file = fget(fd);
850 if (!file)
851 goto out;
852 }
853
854 down_write(&current->mm->mmap_sem);
855 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
856 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
857 /* Result is out of bounds. */
858 do_munmap(current->mm, addr, len);
859 error = -ENOMEM;
860 }
861 up_write(&current->mm->mmap_sem);
862
863 if (file)
864 fput(file);
865out:
866 return error;
867}
868
869
870asmlinkage unsigned long
24954a14 871old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
1da177e4
LT		 872{
873 struct mmap_arg_struct_emu31 a;
874 int error = -EFAULT;
875
876 if (copy_from_user(&a, arg, sizeof(a)))
877 goto out;
878
879 error = -EINVAL;
880 if (a.offset & ~PAGE_MASK)
881 goto out;
882
883 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
884out:
885 return error;
886}
887
888asmlinkage long
24954a14 889sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
1da177e4
LT		 890{
891 struct mmap_arg_struct_emu31 a;
892 int error = -EFAULT;
893
894 if (copy_from_user(&a, arg, sizeof(a)))
895 goto out;
896 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
897out:
898 return error;
899}
900
24954a14 901asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
1da177e4
LT		 902{
903 if ((compat_ssize_t) count < 0)
904 return -EINVAL;
905
906 return sys_read(fd, buf, count);
907}
908
24954a14 909asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
1da177e4
LT		 910{
911 if ((compat_ssize_t) count < 0)
912 return -EINVAL;
913
914 return sys_write(fd, buf, count);
915}
916
03ff9a23 917asmlinkage long sys32_clone(void)
1da177e4 918{
03ff9a23
MS		 919 struct pt_regs *regs = task_pt_regs(current);
920 unsigned long clone_flags;
921 unsigned long newsp;
24954a14 922 int __user *parent_tidptr, *child_tidptr;
1da177e4 923
03ff9a23
MS		 924 clone_flags = regs->gprs[3] & 0xffffffffUL;
925 newsp = regs->orig_gpr2 & 0x7fffffffUL;
926 parent_tidptr = compat_ptr(regs->gprs[4]);
927 child_tidptr = compat_ptr(regs->gprs[5]);
928 if (!newsp)
929 newsp = regs->gprs[15];
930 return do_fork(clone_flags, newsp, regs, 0,
1da177e4
LT		 931 parent_tidptr, child_tidptr);
932}
933
068e1b94
MS		 934/*
935 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
936 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
937 * because the 31 bit values differ from the 64 bit values.
938 */
939
940asmlinkage long
941sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
942{
943 if (advise == 4)
944 advise = POSIX_FADV_DONTNEED;
945 else if (advise == 5)
946 advise = POSIX_FADV_NOREUSE;
947 return sys_fadvise64(fd, offset, len, advise);
948}
949
950struct fadvise64_64_args {
951 int fd;
952 long long offset;
953 long long len;
954 int advice;
955};
956
957asmlinkage long
958sys32_fadvise64_64(struct fadvise64_64_args __user *args)
959{
960 struct fadvise64_64_args a;
961
962 if ( copy_from_user(&a, args, sizeof(a)) )
963 return -EFAULT;
964 if (a.advice == 4)
965 a.advice = POSIX_FADV_DONTNEED;
966 else if (a.advice == 5)
967 a.advice = POSIX_FADV_NOREUSE;
968 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
969}
Linux 6.x block layer and io_uring tree(s)