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CRED: Separate task security context from task_struct
[deliverable/linux.git] / arch / s390 / kernel / compat_linux.c
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->cred->uid), ruid)) &&
152 !(retval = put_user(high2lowuid(current->cred->euid), euid)))
153 retval = put_user(high2lowuid(current->cred->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->cred->gid), rgid)) &&
169 !(retval = put_user(high2lowgid(current->cred->egid), egid)))
170 retval = put_user(high2lowgid(current->cred->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->cred->group_info);
221 i = current->cred->group_info->ngroups;
222 if (gidsetsize) {
223 if (i > gidsetsize) {
224 i = -EINVAL;
225 goto out;
226 }
227 if (groups16_to_user(grouplist, current->cred->group_info)) {
228 i = -EFAULT;
229 goto out;
230 }
231 }
232 out:
233 put_group_info(current->cred->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->cred->uid);
265 }
266
267 asmlinkage long sys32_geteuid16(void)
268 {
269 return high2lowuid(current->cred->euid);
270 }
271
272 asmlinkage long sys32_getgid16(void)
273 {
274 return high2lowgid(current->cred->gid);
275 }
276
277 asmlinkage long sys32_getegid16(void)
278 {
279 return high2lowgid(current->cred->egid);
280 }
281
282 /*
283 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
284 *
285 * This is really horribly ugly.
286 */
287 #ifdef CONFIG_SYSVIPC
288 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
289 {
290 if (call >> 16) /* hack for backward compatibility */
291 return -EINVAL;
292
293 call &= 0xffff;
294
295 switch (call) {
296 case SEMTIMEDOP:
297 return compat_sys_semtimedop(first, compat_ptr(ptr),
298 second, compat_ptr(third));
299 case SEMOP:
300 /* struct sembuf is the same on 32 and 64bit :)) */
301 return sys_semtimedop(first, compat_ptr(ptr),
302 second, NULL);
303 case SEMGET:
304 return sys_semget(first, second, third);
305 case SEMCTL:
306 return compat_sys_semctl(first, second, third,
307 compat_ptr(ptr));
308 case MSGSND:
309 return compat_sys_msgsnd(first, second, third,
310 compat_ptr(ptr));
311 case MSGRCV:
312 return compat_sys_msgrcv(first, second, 0, third,
313 0, compat_ptr(ptr));
314 case MSGGET:
315 return sys_msgget((key_t) first, second);
316 case MSGCTL:
317 return compat_sys_msgctl(first, second, compat_ptr(ptr));
318 case SHMAT:
319 return compat_sys_shmat(first, second, third,
320 0, compat_ptr(ptr));
321 case SHMDT:
322 return sys_shmdt(compat_ptr(ptr));
323 case SHMGET:
324 return sys_shmget(first, (unsigned)second, third);
325 case SHMCTL:
326 return compat_sys_shmctl(first, second, compat_ptr(ptr));
327 }
328
329 return -ENOSYS;
330 }
331 #endif
332
333 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
334 {
335 if ((int)high < 0)
336 return -EINVAL;
337 else
338 return sys_truncate(path, (high << 32) | low);
339 }
340
341 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
342 {
343 if ((int)high < 0)
344 return -EINVAL;
345 else
346 return sys_ftruncate(fd, (high << 32) | low);
347 }
348
349 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
350 struct compat_timespec __user *interval)
351 {
352 struct timespec t;
353 int ret;
354 mm_segment_t old_fs = get_fs ();
355
356 set_fs (KERNEL_DS);
357 ret = sys_sched_rr_get_interval(pid,
358 (struct timespec __force __user *) &t);
359 set_fs (old_fs);
360 if (put_compat_timespec(&t, interval))
361 return -EFAULT;
362 return ret;
363 }
364
365 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
366 compat_sigset_t __user *oset, size_t sigsetsize)
367 {
368 sigset_t s;
369 compat_sigset_t s32;
370 int ret;
371 mm_segment_t old_fs = get_fs();
372
373 if (set) {
374 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
375 return -EFAULT;
376 switch (_NSIG_WORDS) {
377 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
378 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
379 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
380 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
381 }
382 }
383 set_fs (KERNEL_DS);
384 ret = sys_rt_sigprocmask(how,
385 set ? (sigset_t __force __user *) &s : NULL,
386 oset ? (sigset_t __force __user *) &s : NULL,
387 sigsetsize);
388 set_fs (old_fs);
389 if (ret) return ret;
390 if (oset) {
391 switch (_NSIG_WORDS) {
392 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
393 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
394 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
395 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
396 }
397 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
398 return -EFAULT;
399 }
400 return 0;
401 }
402
403 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
404 size_t sigsetsize)
405 {
406 sigset_t s;
407 compat_sigset_t s32;
408 int ret;
409 mm_segment_t old_fs = get_fs();
410
411 set_fs (KERNEL_DS);
412 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
413 set_fs (old_fs);
414 if (!ret) {
415 switch (_NSIG_WORDS) {
416 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
417 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
418 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
419 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
420 }
421 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
422 return -EFAULT;
423 }
424 return ret;
425 }
426
427 asmlinkage long
428 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
429 {
430 siginfo_t info;
431 int ret;
432 mm_segment_t old_fs = get_fs();
433
434 if (copy_siginfo_from_user32(&info, uinfo))
435 return -EFAULT;
436 set_fs (KERNEL_DS);
437 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
438 set_fs (old_fs);
439 return ret;
440 }
441
442 /*
443 * sys32_execve() executes a new program after the asm stub has set
444 * things up for us. This should basically do what I want it to.
445 */
446 asmlinkage long sys32_execve(void)
447 {
448 struct pt_regs *regs = task_pt_regs(current);
449 char *filename;
450 unsigned long result;
451 int rc;
452
453 filename = getname(compat_ptr(regs->orig_gpr2));
454 if (IS_ERR(filename)) {
455 result = PTR_ERR(filename);
456 goto out;
457 }
458 rc = compat_do_execve(filename, compat_ptr(regs->gprs[3]),
459 compat_ptr(regs->gprs[4]), regs);
460 if (rc) {
461 result = rc;
462 goto out_putname;
463 }
464 task_lock(current);
465 current->ptrace &= ~PT_DTRACE;
466 task_unlock(current);
467 current->thread.fp_regs.fpc=0;
468 asm volatile("sfpc %0,0" : : "d" (0));
469 result = regs->gprs[2];
470 out_putname:
471 putname(filename);
472 out:
473 return result;
474 }
475
476
477 #ifdef CONFIG_MODULES
478
479 asmlinkage long
480 sys32_init_module(void __user *umod, unsigned long len,
481 const char __user *uargs)
482 {
483 return sys_init_module(umod, len, uargs);
484 }
485
486 asmlinkage long
487 sys32_delete_module(const char __user *name_user, unsigned int flags)
488 {
489 return sys_delete_module(name_user, flags);
490 }
491
492 #else /* CONFIG_MODULES */
493
494 asmlinkage long
495 sys32_init_module(void __user *umod, unsigned long len,
496 const char __user *uargs)
497 {
498 return -ENOSYS;
499 }
500
501 asmlinkage long
502 sys32_delete_module(const char __user *name_user, unsigned int flags)
503 {
504 return -ENOSYS;
505 }
506
507 #endif /* CONFIG_MODULES */
508
509 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
510 size_t count, u32 poshi, u32 poslo)
511 {
512 if ((compat_ssize_t) count < 0)
513 return -EINVAL;
514 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
515 }
516
517 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
518 size_t count, u32 poshi, u32 poslo)
519 {
520 if ((compat_ssize_t) count < 0)
521 return -EINVAL;
522 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
523 }
524
525 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
526 {
527 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
528 }
529
530 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
531 {
532 mm_segment_t old_fs = get_fs();
533 int ret;
534 off_t of;
535
536 if (offset && get_user(of, offset))
537 return -EFAULT;
538
539 set_fs(KERNEL_DS);
540 ret = sys_sendfile(out_fd, in_fd,
541 offset ? (off_t __force __user *) &of : NULL, count);
542 set_fs(old_fs);
543
544 if (offset && put_user(of, offset))
545 return -EFAULT;
546
547 return ret;
548 }
549
550 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
551 compat_loff_t __user *offset, s32 count)
552 {
553 mm_segment_t old_fs = get_fs();
554 int ret;
555 loff_t lof;
556
557 if (offset && get_user(lof, offset))
558 return -EFAULT;
559
560 set_fs(KERNEL_DS);
561 ret = sys_sendfile64(out_fd, in_fd,
562 offset ? (loff_t __force __user *) &lof : NULL,
563 count);
564 set_fs(old_fs);
565
566 if (offset && put_user(lof, offset))
567 return -EFAULT;
568
569 return ret;
570 }
571
572 #ifdef CONFIG_SYSCTL_SYSCALL
573 struct __sysctl_args32 {
574 u32 name;
575 int nlen;
576 u32 oldval;
577 u32 oldlenp;
578 u32 newval;
579 u32 newlen;
580 u32 __unused[4];
581 };
582
583 asmlinkage long sys32_sysctl(struct __sysctl_args32 __user *args)
584 {
585 struct __sysctl_args32 tmp;
586 int error;
587 size_t oldlen;
588 size_t __user *oldlenp = NULL;
589 unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
590
591 if (copy_from_user(&tmp, args, sizeof(tmp)))
592 return -EFAULT;
593
594 if (tmp.oldval && tmp.oldlenp) {
595 /* Duh, this is ugly and might not work if sysctl_args
596 is in read-only memory, but do_sysctl does indirectly
597 a lot of uaccess in both directions and we'd have to
598 basically copy the whole sysctl.c here, and
599 glibc's __sysctl uses rw memory for the structure
600 anyway. */
601 if (get_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)) ||
602 put_user(oldlen, (size_t __user *)addr))
603 return -EFAULT;
604 oldlenp = (size_t __user *)addr;
605 }
606
607 lock_kernel();
608 error = do_sysctl(compat_ptr(tmp.name), tmp.nlen, compat_ptr(tmp.oldval),
609 oldlenp, compat_ptr(tmp.newval), tmp.newlen);
610 unlock_kernel();
611 if (oldlenp) {
612 if (!error) {
613 if (get_user(oldlen, (size_t __user *)addr) ||
614 put_user(oldlen, (u32 __user *)compat_ptr(tmp.oldlenp)))
615 error = -EFAULT;
616 }
617 if (copy_to_user(args->__unused, tmp.__unused,
618 sizeof(tmp.__unused)))
619 error = -EFAULT;
620 }
621 return error;
622 }
623 #endif
624
625 struct stat64_emu31 {
626 unsigned long long st_dev;
627 unsigned int __pad1;
628 #define STAT64_HAS_BROKEN_ST_INO 1
629 u32 __st_ino;
630 unsigned int st_mode;
631 unsigned int st_nlink;
632 u32 st_uid;
633 u32 st_gid;
634 unsigned long long st_rdev;
635 unsigned int __pad3;
636 long st_size;
637 u32 st_blksize;
638 unsigned char __pad4[4];
639 u32 __pad5; /* future possible st_blocks high bits */
640 u32 st_blocks; /* Number 512-byte blocks allocated. */
641 u32 st_atime;
642 u32 __pad6;
643 u32 st_mtime;
644 u32 __pad7;
645 u32 st_ctime;
646 u32 __pad8; /* will be high 32 bits of ctime someday */
647 unsigned long st_ino;
648 };
649
650 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
651 {
652 struct stat64_emu31 tmp;
653
654 memset(&tmp, 0, sizeof(tmp));
655
656 tmp.st_dev = huge_encode_dev(stat->dev);
657 tmp.st_ino = stat->ino;
658 tmp.__st_ino = (u32)stat->ino;
659 tmp.st_mode = stat->mode;
660 tmp.st_nlink = (unsigned int)stat->nlink;
661 tmp.st_uid = stat->uid;
662 tmp.st_gid = stat->gid;
663 tmp.st_rdev = huge_encode_dev(stat->rdev);
664 tmp.st_size = stat->size;
665 tmp.st_blksize = (u32)stat->blksize;
666 tmp.st_blocks = (u32)stat->blocks;
667 tmp.st_atime = (u32)stat->atime.tv_sec;
668 tmp.st_mtime = (u32)stat->mtime.tv_sec;
669 tmp.st_ctime = (u32)stat->ctime.tv_sec;
670
671 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
672 }
673
674 asmlinkage long sys32_stat64(char __user * filename, struct stat64_emu31 __user * statbuf)
675 {
676 struct kstat stat;
677 int ret = vfs_stat(filename, &stat);
678 if (!ret)
679 ret = cp_stat64(statbuf, &stat);
680 return ret;
681 }
682
683 asmlinkage long sys32_lstat64(char __user * filename, struct stat64_emu31 __user * statbuf)
684 {
685 struct kstat stat;
686 int ret = vfs_lstat(filename, &stat);
687 if (!ret)
688 ret = cp_stat64(statbuf, &stat);
689 return ret;
690 }
691
692 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
693 {
694 struct kstat stat;
695 int ret = vfs_fstat(fd, &stat);
696 if (!ret)
697 ret = cp_stat64(statbuf, &stat);
698 return ret;
699 }
700
701 asmlinkage long sys32_fstatat64(unsigned int dfd, char __user *filename,
702 struct stat64_emu31 __user* statbuf, int flag)
703 {
704 struct kstat stat;
705 int error = -EINVAL;
706
707 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
708 goto out;
709
710 if (flag & AT_SYMLINK_NOFOLLOW)
711 error = vfs_lstat_fd(dfd, filename, &stat);
712 else
713 error = vfs_stat_fd(dfd, filename, &stat);
714
715 if (!error)
716 error = cp_stat64(statbuf, &stat);
717 out:
718 return error;
719 }
720
721 /*
722 * Linux/i386 didn't use to be able to handle more than
723 * 4 system call parameters, so these system calls used a memory
724 * block for parameter passing..
725 */
726
727 struct mmap_arg_struct_emu31 {
728 u32 addr;
729 u32 len;
730 u32 prot;
731 u32 flags;
732 u32 fd;
733 u32 offset;
734 };
735
736 /* common code for old and new mmaps */
737 static inline long do_mmap2(
738 unsigned long addr, unsigned long len,
739 unsigned long prot, unsigned long flags,
740 unsigned long fd, unsigned long pgoff)
741 {
742 struct file * file = NULL;
743 unsigned long error = -EBADF;
744
745 flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
746 if (!(flags & MAP_ANONYMOUS)) {
747 file = fget(fd);
748 if (!file)
749 goto out;
750 }
751
752 down_write(&current->mm->mmap_sem);
753 error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
754 if (!IS_ERR((void *) error) && error + len >= 0x80000000ULL) {
755 /* Result is out of bounds. */
756 do_munmap(current->mm, addr, len);
757 error = -ENOMEM;
758 }
759 up_write(&current->mm->mmap_sem);
760
761 if (file)
762 fput(file);
763 out:
764 return error;
765 }
766
767
768 asmlinkage unsigned long
769 old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
770 {
771 struct mmap_arg_struct_emu31 a;
772 int error = -EFAULT;
773
774 if (copy_from_user(&a, arg, sizeof(a)))
775 goto out;
776
777 error = -EINVAL;
778 if (a.offset & ~PAGE_MASK)
779 goto out;
780
781 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset >> PAGE_SHIFT);
782 out:
783 return error;
784 }
785
786 asmlinkage long
787 sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
788 {
789 struct mmap_arg_struct_emu31 a;
790 int error = -EFAULT;
791
792 if (copy_from_user(&a, arg, sizeof(a)))
793 goto out;
794 error = do_mmap2(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
795 out:
796 return error;
797 }
798
799 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
800 {
801 if ((compat_ssize_t) count < 0)
802 return -EINVAL;
803
804 return sys_read(fd, buf, count);
805 }
806
807 asmlinkage long sys32_write(unsigned int fd, char __user * buf, size_t count)
808 {
809 if ((compat_ssize_t) count < 0)
810 return -EINVAL;
811
812 return sys_write(fd, buf, count);
813 }
814
815 asmlinkage long sys32_clone(void)
816 {
817 struct pt_regs *regs = task_pt_regs(current);
818 unsigned long clone_flags;
819 unsigned long newsp;
820 int __user *parent_tidptr, *child_tidptr;
821
822 clone_flags = regs->gprs[3] & 0xffffffffUL;
823 newsp = regs->orig_gpr2 & 0x7fffffffUL;
824 parent_tidptr = compat_ptr(regs->gprs[4]);
825 child_tidptr = compat_ptr(regs->gprs[5]);
826 if (!newsp)
827 newsp = regs->gprs[15];
828 return do_fork(clone_flags, newsp, regs, 0,
829 parent_tidptr, child_tidptr);
830 }
831
832 /*
833 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
834 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
835 * because the 31 bit values differ from the 64 bit values.
836 */
837
838 asmlinkage long
839 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
840 {
841 if (advise == 4)
842 advise = POSIX_FADV_DONTNEED;
843 else if (advise == 5)
844 advise = POSIX_FADV_NOREUSE;
845 return sys_fadvise64(fd, offset, len, advise);
846 }
847
848 struct fadvise64_64_args {
849 int fd;
850 long long offset;
851 long long len;
852 int advice;
853 };
854
855 asmlinkage long
856 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
857 {
858 struct fadvise64_64_args a;
859
860 if ( copy_from_user(&a, args, sizeof(a)) )
861 return -EFAULT;
862 if (a.advice == 4)
863 a.advice = POSIX_FADV_DONTNEED;
864 else if (a.advice == 5)
865 a.advice = POSIX_FADV_NOREUSE;
866 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
867 }
Linux kernel - Deliverables
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