USB: cp210x: call generic open last in open
[zen-stable.git] / arch / s390 / kernel / compat_linux.c
blobab64bdbab2ae3cf7b7025ad1d4afe1838c6cd6ec
1 /*
2 * arch/s390x/kernel/linux32.c
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)
10 * Conversion between 31bit and 64bit native syscalls.
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)
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/smp.h>
28 #include <linux/sem.h>
29 #include <linux/msg.h>
30 #include <linux/shm.h>
31 #include <linux/uio.h>
32 #include <linux/quota.h>
33 #include <linux/module.h>
34 #include <linux/poll.h>
35 #include <linux/personality.h>
36 #include <linux/stat.h>
37 #include <linux/filter.h>
38 #include <linux/highmem.h>
39 #include <linux/highuid.h>
40 #include <linux/mman.h>
41 #include <linux/ipv6.h>
42 #include <linux/in.h>
43 #include <linux/icmpv6.h>
44 #include <linux/syscalls.h>
45 #include <linux/sysctl.h>
46 #include <linux/binfmts.h>
47 #include <linux/capability.h>
48 #include <linux/compat.h>
49 #include <linux/vfs.h>
50 #include <linux/ptrace.h>
51 #include <linux/fadvise.h>
52 #include <linux/ipc.h>
53 #include <linux/slab.h>
55 #include <asm/types.h>
56 #include <asm/uaccess.h>
58 #include <net/scm.h>
59 #include <net/sock.h>
61 #include "compat_linux.h"
63 u32 psw32_user_bits = PSW32_MASK_DAT | PSW32_MASK_IO | PSW32_MASK_EXT |
64 PSW32_DEFAULT_KEY | PSW32_MASK_BASE | PSW32_MASK_MCHECK |
65 PSW32_MASK_PSTATE | PSW32_ASC_HOME;
67 /* For this source file, we want overflow handling. */
69 #undef high2lowuid
70 #undef high2lowgid
71 #undef low2highuid
72 #undef low2highgid
73 #undef SET_UID16
74 #undef SET_GID16
75 #undef NEW_TO_OLD_UID
76 #undef NEW_TO_OLD_GID
77 #undef SET_OLDSTAT_UID
78 #undef SET_OLDSTAT_GID
79 #undef SET_STAT_UID
80 #undef SET_STAT_GID
82 #define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
83 #define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
84 #define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
85 #define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
86 #define SET_UID16(var, uid) var = high2lowuid(uid)
87 #define SET_GID16(var, gid) var = high2lowgid(gid)
88 #define NEW_TO_OLD_UID(uid) high2lowuid(uid)
89 #define NEW_TO_OLD_GID(gid) high2lowgid(gid)
90 #define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
91 #define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
92 #define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
93 #define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
95 asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
97 return sys_chown(filename, low2highuid(user), low2highgid(group));
100 asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
102 return sys_lchown(filename, low2highuid(user), low2highgid(group));
105 asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
107 return sys_fchown(fd, low2highuid(user), low2highgid(group));
110 asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
112 return sys_setregid(low2highgid(rgid), low2highgid(egid));
115 asmlinkage long sys32_setgid16(u16 gid)
117 return sys_setgid((gid_t)gid);
120 asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
122 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
125 asmlinkage long sys32_setuid16(u16 uid)
127 return sys_setuid((uid_t)uid);
130 asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
132 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
133 low2highuid(suid));
136 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
138 int retval;
140 if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
141 !(retval = put_user(high2lowuid(current->cred->euid), euid)))
142 retval = put_user(high2lowuid(current->cred->suid), suid);
144 return retval;
147 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
149 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
150 low2highgid(sgid));
153 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
155 int retval;
157 if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
158 !(retval = put_user(high2lowgid(current->cred->egid), egid)))
159 retval = put_user(high2lowgid(current->cred->sgid), sgid);
161 return retval;
164 asmlinkage long sys32_setfsuid16(u16 uid)
166 return sys_setfsuid((uid_t)uid);
169 asmlinkage long sys32_setfsgid16(u16 gid)
171 return sys_setfsgid((gid_t)gid);
174 static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
176 int i;
177 u16 group;
179 for (i = 0; i < group_info->ngroups; i++) {
180 group = (u16)GROUP_AT(group_info, i);
181 if (put_user(group, grouplist+i))
182 return -EFAULT;
185 return 0;
188 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
190 int i;
191 u16 group;
193 for (i = 0; i < group_info->ngroups; i++) {
194 if (get_user(group, grouplist+i))
195 return -EFAULT;
196 GROUP_AT(group_info, i) = (gid_t)group;
199 return 0;
202 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
204 int i;
206 if (gidsetsize < 0)
207 return -EINVAL;
209 get_group_info(current->cred->group_info);
210 i = current->cred->group_info->ngroups;
211 if (gidsetsize) {
212 if (i > gidsetsize) {
213 i = -EINVAL;
214 goto out;
216 if (groups16_to_user(grouplist, current->cred->group_info)) {
217 i = -EFAULT;
218 goto out;
221 out:
222 put_group_info(current->cred->group_info);
223 return i;
226 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
228 struct group_info *group_info;
229 int retval;
231 if (!capable(CAP_SETGID))
232 return -EPERM;
233 if ((unsigned)gidsetsize > NGROUPS_MAX)
234 return -EINVAL;
236 group_info = groups_alloc(gidsetsize);
237 if (!group_info)
238 return -ENOMEM;
239 retval = groups16_from_user(group_info, grouplist);
240 if (retval) {
241 put_group_info(group_info);
242 return retval;
245 retval = set_current_groups(group_info);
246 put_group_info(group_info);
248 return retval;
251 asmlinkage long sys32_getuid16(void)
253 return high2lowuid(current->cred->uid);
256 asmlinkage long sys32_geteuid16(void)
258 return high2lowuid(current->cred->euid);
261 asmlinkage long sys32_getgid16(void)
263 return high2lowgid(current->cred->gid);
266 asmlinkage long sys32_getegid16(void)
268 return high2lowgid(current->cred->egid);
272 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
274 * This is really horribly ugly.
276 #ifdef CONFIG_SYSVIPC
277 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
279 if (call >> 16) /* hack for backward compatibility */
280 return -EINVAL;
281 switch (call) {
282 case SEMTIMEDOP:
283 return compat_sys_semtimedop(first, compat_ptr(ptr),
284 second, compat_ptr(third));
285 case SEMOP:
286 /* struct sembuf is the same on 32 and 64bit :)) */
287 return sys_semtimedop(first, compat_ptr(ptr),
288 second, NULL);
289 case SEMGET:
290 return sys_semget(first, second, third);
291 case SEMCTL:
292 return compat_sys_semctl(first, second, third,
293 compat_ptr(ptr));
294 case MSGSND:
295 return compat_sys_msgsnd(first, second, third,
296 compat_ptr(ptr));
297 case MSGRCV:
298 return compat_sys_msgrcv(first, second, 0, third,
299 0, compat_ptr(ptr));
300 case MSGGET:
301 return sys_msgget((key_t) first, second);
302 case MSGCTL:
303 return compat_sys_msgctl(first, second, compat_ptr(ptr));
304 case SHMAT:
305 return compat_sys_shmat(first, second, third,
306 0, compat_ptr(ptr));
307 case SHMDT:
308 return sys_shmdt(compat_ptr(ptr));
309 case SHMGET:
310 return sys_shmget(first, (unsigned)second, third);
311 case SHMCTL:
312 return compat_sys_shmctl(first, second, compat_ptr(ptr));
315 return -ENOSYS;
317 #endif
319 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
321 if ((int)high < 0)
322 return -EINVAL;
323 else
324 return sys_truncate(path, (high << 32) | low);
327 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
329 if ((int)high < 0)
330 return -EINVAL;
331 else
332 return sys_ftruncate(fd, (high << 32) | low);
335 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
336 struct compat_timespec __user *interval)
338 struct timespec t;
339 int ret;
340 mm_segment_t old_fs = get_fs ();
342 set_fs (KERNEL_DS);
343 ret = sys_sched_rr_get_interval(pid,
344 (struct timespec __force __user *) &t);
345 set_fs (old_fs);
346 if (put_compat_timespec(&t, interval))
347 return -EFAULT;
348 return ret;
351 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
352 compat_sigset_t __user *oset, size_t sigsetsize)
354 sigset_t s;
355 compat_sigset_t s32;
356 int ret;
357 mm_segment_t old_fs = get_fs();
359 if (set) {
360 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
361 return -EFAULT;
362 s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
364 set_fs (KERNEL_DS);
365 ret = sys_rt_sigprocmask(how,
366 set ? (sigset_t __force __user *) &s : NULL,
367 oset ? (sigset_t __force __user *) &s : NULL,
368 sigsetsize);
369 set_fs (old_fs);
370 if (ret) return ret;
371 if (oset) {
372 s32.sig[1] = (s.sig[0] >> 32);
373 s32.sig[0] = s.sig[0];
374 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
375 return -EFAULT;
377 return 0;
380 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
381 size_t sigsetsize)
383 sigset_t s;
384 compat_sigset_t s32;
385 int ret;
386 mm_segment_t old_fs = get_fs();
388 set_fs (KERNEL_DS);
389 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
390 set_fs (old_fs);
391 if (!ret) {
392 s32.sig[1] = (s.sig[0] >> 32);
393 s32.sig[0] = s.sig[0];
394 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
395 return -EFAULT;
397 return ret;
400 asmlinkage long
401 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
403 siginfo_t info;
404 int ret;
405 mm_segment_t old_fs = get_fs();
407 if (copy_siginfo_from_user32(&info, uinfo))
408 return -EFAULT;
409 set_fs (KERNEL_DS);
410 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
411 set_fs (old_fs);
412 return ret;
416 * sys32_execve() executes a new program after the asm stub has set
417 * things up for us. This should basically do what I want it to.
419 asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
420 compat_uptr_t __user *envp)
422 struct pt_regs *regs = task_pt_regs(current);
423 char *filename;
424 long rc;
426 filename = getname(name);
427 rc = PTR_ERR(filename);
428 if (IS_ERR(filename))
429 return rc;
430 rc = compat_do_execve(filename, argv, envp, regs);
431 if (rc)
432 goto out;
433 current->thread.fp_regs.fpc=0;
434 asm volatile("sfpc %0,0" : : "d" (0));
435 rc = regs->gprs[2];
436 out:
437 putname(filename);
438 return rc;
441 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
442 size_t count, u32 poshi, u32 poslo)
444 if ((compat_ssize_t) count < 0)
445 return -EINVAL;
446 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
449 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
450 size_t count, u32 poshi, u32 poslo)
452 if ((compat_ssize_t) count < 0)
453 return -EINVAL;
454 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
457 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
459 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
462 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
464 mm_segment_t old_fs = get_fs();
465 int ret;
466 off_t of;
468 if (offset && get_user(of, offset))
469 return -EFAULT;
471 set_fs(KERNEL_DS);
472 ret = sys_sendfile(out_fd, in_fd,
473 offset ? (off_t __force __user *) &of : NULL, count);
474 set_fs(old_fs);
476 if (offset && put_user(of, offset))
477 return -EFAULT;
479 return ret;
482 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
483 compat_loff_t __user *offset, s32 count)
485 mm_segment_t old_fs = get_fs();
486 int ret;
487 loff_t lof;
489 if (offset && get_user(lof, offset))
490 return -EFAULT;
492 set_fs(KERNEL_DS);
493 ret = sys_sendfile64(out_fd, in_fd,
494 offset ? (loff_t __force __user *) &lof : NULL,
495 count);
496 set_fs(old_fs);
498 if (offset && put_user(lof, offset))
499 return -EFAULT;
501 return ret;
504 struct stat64_emu31 {
505 unsigned long long st_dev;
506 unsigned int __pad1;
507 #define STAT64_HAS_BROKEN_ST_INO 1
508 u32 __st_ino;
509 unsigned int st_mode;
510 unsigned int st_nlink;
511 u32 st_uid;
512 u32 st_gid;
513 unsigned long long st_rdev;
514 unsigned int __pad3;
515 long st_size;
516 u32 st_blksize;
517 unsigned char __pad4[4];
518 u32 __pad5; /* future possible st_blocks high bits */
519 u32 st_blocks; /* Number 512-byte blocks allocated. */
520 u32 st_atime;
521 u32 __pad6;
522 u32 st_mtime;
523 u32 __pad7;
524 u32 st_ctime;
525 u32 __pad8; /* will be high 32 bits of ctime someday */
526 unsigned long st_ino;
529 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
531 struct stat64_emu31 tmp;
533 memset(&tmp, 0, sizeof(tmp));
535 tmp.st_dev = huge_encode_dev(stat->dev);
536 tmp.st_ino = stat->ino;
537 tmp.__st_ino = (u32)stat->ino;
538 tmp.st_mode = stat->mode;
539 tmp.st_nlink = (unsigned int)stat->nlink;
540 tmp.st_uid = stat->uid;
541 tmp.st_gid = stat->gid;
542 tmp.st_rdev = huge_encode_dev(stat->rdev);
543 tmp.st_size = stat->size;
544 tmp.st_blksize = (u32)stat->blksize;
545 tmp.st_blocks = (u32)stat->blocks;
546 tmp.st_atime = (u32)stat->atime.tv_sec;
547 tmp.st_mtime = (u32)stat->mtime.tv_sec;
548 tmp.st_ctime = (u32)stat->ctime.tv_sec;
550 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
553 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
555 struct kstat stat;
556 int ret = vfs_stat(filename, &stat);
557 if (!ret)
558 ret = cp_stat64(statbuf, &stat);
559 return ret;
562 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
564 struct kstat stat;
565 int ret = vfs_lstat(filename, &stat);
566 if (!ret)
567 ret = cp_stat64(statbuf, &stat);
568 return ret;
571 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
573 struct kstat stat;
574 int ret = vfs_fstat(fd, &stat);
575 if (!ret)
576 ret = cp_stat64(statbuf, &stat);
577 return ret;
580 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
581 struct stat64_emu31 __user* statbuf, int flag)
583 struct kstat stat;
584 int error;
586 error = vfs_fstatat(dfd, filename, &stat, flag);
587 if (error)
588 return error;
589 return cp_stat64(statbuf, &stat);
593 * Linux/i386 didn't use to be able to handle more than
594 * 4 system call parameters, so these system calls used a memory
595 * block for parameter passing..
598 struct mmap_arg_struct_emu31 {
599 compat_ulong_t addr;
600 compat_ulong_t len;
601 compat_ulong_t prot;
602 compat_ulong_t flags;
603 compat_ulong_t fd;
604 compat_ulong_t offset;
607 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
609 struct mmap_arg_struct_emu31 a;
611 if (copy_from_user(&a, arg, sizeof(a)))
612 return -EFAULT;
613 if (a.offset & ~PAGE_MASK)
614 return -EINVAL;
615 a.addr = (unsigned long) compat_ptr(a.addr);
616 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
617 a.offset >> PAGE_SHIFT);
620 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
622 struct mmap_arg_struct_emu31 a;
624 if (copy_from_user(&a, arg, sizeof(a)))
625 return -EFAULT;
626 a.addr = (unsigned long) compat_ptr(a.addr);
627 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
630 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
632 if ((compat_ssize_t) count < 0)
633 return -EINVAL;
635 return sys_read(fd, buf, count);
638 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
640 if ((compat_ssize_t) count < 0)
641 return -EINVAL;
643 return sys_write(fd, buf, count);
647 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
648 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
649 * because the 31 bit values differ from the 64 bit values.
652 asmlinkage long
653 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
655 if (advise == 4)
656 advise = POSIX_FADV_DONTNEED;
657 else if (advise == 5)
658 advise = POSIX_FADV_NOREUSE;
659 return sys_fadvise64(fd, offset, len, advise);
662 struct fadvise64_64_args {
663 int fd;
664 long long offset;
665 long long len;
666 int advice;
669 asmlinkage long
670 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
672 struct fadvise64_64_args a;
674 if ( copy_from_user(&a, args, sizeof(a)) )
675 return -EFAULT;
676 if (a.advice == 4)
677 a.advice = POSIX_FADV_DONTNEED;
678 else if (a.advice == 5)
679 a.advice = POSIX_FADV_NOREUSE;
680 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);