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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/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>
54
55#include <asm/types.h>
56#include <asm/uaccess.h>
57
58#include <net/scm.h>
59#include <net/sock.h>
60
61#include "compat_linux.h"
62
63long psw_user32_bits = (PSW_BASE32_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
64 PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
65 PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
66long psw32_user_bits = (PSW32_BASE_BITS | PSW32_MASK_DAT | PSW32_ASC_HOME |
67 PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
68 PSW32_MASK_PSTATE);
69
70/* For this source file, we want overflow handling. */
71
72#undef high2lowuid
73#undef high2lowgid
74#undef low2highuid
75#undef low2highgid
76#undef SET_UID16
77#undef SET_GID16
78#undef NEW_TO_OLD_UID
79#undef NEW_TO_OLD_GID
80#undef SET_OLDSTAT_UID
81#undef SET_OLDSTAT_GID
82#undef SET_STAT_UID
83#undef SET_STAT_GID
84
85#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
86#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
87#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
88#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
89#define SET_UID16(var, uid) var = high2lowuid(uid)
90#define SET_GID16(var, gid) var = high2lowgid(gid)
91#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
92#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
93#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
94#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
95#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
96#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
97
98asmlinkage long sys32_chown16(const char __user * filename, u16 user, u16 group)
99{
100 return sys_chown(filename, low2highuid(user), low2highgid(group));
101}
102
103asmlinkage long sys32_lchown16(const char __user * filename, u16 user, u16 group)
104{
105 return sys_lchown(filename, low2highuid(user), low2highgid(group));
106}
107
108asmlinkage long sys32_fchown16(unsigned int fd, u16 user, u16 group)
109{
110 return sys_fchown(fd, low2highuid(user), low2highgid(group));
111}
112
113asmlinkage long sys32_setregid16(u16 rgid, u16 egid)
114{
115 return sys_setregid(low2highgid(rgid), low2highgid(egid));
116}
117
118asmlinkage long sys32_setgid16(u16 gid)
119{
120 return sys_setgid((gid_t)gid);
121}
122
123asmlinkage long sys32_setreuid16(u16 ruid, u16 euid)
124{
125 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
126}
127
128asmlinkage long sys32_setuid16(u16 uid)
129{
130 return sys_setuid((uid_t)uid);
131}
132
133asmlinkage long sys32_setresuid16(u16 ruid, u16 euid, u16 suid)
134{
135 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
136 low2highuid(suid));
137}
138
139asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
140{
141 int retval;
142
143 if (!(retval = put_user(high2lowuid(current->cred->uid), ruid)) &&
144 !(retval = put_user(high2lowuid(current->cred->euid), euid)))
145 retval = put_user(high2lowuid(current->cred->suid), suid);
146
147 return retval;
148}
149
150asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
151{
152 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
153 low2highgid(sgid));
154}
155
156asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
157{
158 int retval;
159
160 if (!(retval = put_user(high2lowgid(current->cred->gid), rgid)) &&
161 !(retval = put_user(high2lowgid(current->cred->egid), egid)))
162 retval = put_user(high2lowgid(current->cred->sgid), sgid);
163
164 return retval;
165}
166
167asmlinkage long sys32_setfsuid16(u16 uid)
168{
169 return sys_setfsuid((uid_t)uid);
170}
171
172asmlinkage long sys32_setfsgid16(u16 gid)
173{
174 return sys_setfsgid((gid_t)gid);
175}
176
177static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
178{
179 int i;
180 u16 group;
181
182 for (i = 0; i < group_info->ngroups; i++) {
183 group = (u16)GROUP_AT(group_info, i);
184 if (put_user(group, grouplist+i))
185 return -EFAULT;
186 }
187
188 return 0;
189}
190
191static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
192{
193 int i;
194 u16 group;
195
196 for (i = 0; i < group_info->ngroups; i++) {
197 if (get_user(group, grouplist+i))
198 return -EFAULT;
199 GROUP_AT(group_info, i) = (gid_t)group;
200 }
201
202 return 0;
203}
204
205asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
206{
207 int i;
208
209 if (gidsetsize < 0)
210 return -EINVAL;
211
212 get_group_info(current->cred->group_info);
213 i = current->cred->group_info->ngroups;
214 if (gidsetsize) {
215 if (i > gidsetsize) {
216 i = -EINVAL;
217 goto out;
218 }
219 if (groups16_to_user(grouplist, current->cred->group_info)) {
220 i = -EFAULT;
221 goto out;
222 }
223 }
224out:
225 put_group_info(current->cred->group_info);
226 return i;
227}
228
229asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
230{
231 struct group_info *group_info;
232 int retval;
233
234 if (!capable(CAP_SETGID))
235 return -EPERM;
236 if ((unsigned)gidsetsize > NGROUPS_MAX)
237 return -EINVAL;
238
239 group_info = groups_alloc(gidsetsize);
240 if (!group_info)
241 return -ENOMEM;
242 retval = groups16_from_user(group_info, grouplist);
243 if (retval) {
244 put_group_info(group_info);
245 return retval;
246 }
247
248 retval = set_current_groups(group_info);
249 put_group_info(group_info);
250
251 return retval;
252}
253
254asmlinkage long sys32_getuid16(void)
255{
256 return high2lowuid(current->cred->uid);
257}
258
259asmlinkage long sys32_geteuid16(void)
260{
261 return high2lowuid(current->cred->euid);
262}
263
264asmlinkage long sys32_getgid16(void)
265{
266 return high2lowgid(current->cred->gid);
267}
268
269asmlinkage long sys32_getegid16(void)
270{
271 return high2lowgid(current->cred->egid);
272}
273
274/*
275 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
276 *
277 * This is really horribly ugly.
278 */
279#ifdef CONFIG_SYSVIPC
280asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
281{
282 if (call >> 16) /* hack for backward compatibility */
283 return -EINVAL;
284
285 call &= 0xffff;
286
287 switch (call) {
288 case SEMTIMEDOP:
289 return compat_sys_semtimedop(first, compat_ptr(ptr),
290 second, compat_ptr(third));
291 case SEMOP:
292 /* struct sembuf is the same on 32 and 64bit :)) */
293 return sys_semtimedop(first, compat_ptr(ptr),
294 second, NULL);
295 case SEMGET:
296 return sys_semget(first, second, third);
297 case SEMCTL:
298 return compat_sys_semctl(first, second, third,
299 compat_ptr(ptr));
300 case MSGSND:
301 return compat_sys_msgsnd(first, second, third,
302 compat_ptr(ptr));
303 case MSGRCV:
304 return compat_sys_msgrcv(first, second, 0, third,
305 0, compat_ptr(ptr));
306 case MSGGET:
307 return sys_msgget((key_t) first, second);
308 case MSGCTL:
309 return compat_sys_msgctl(first, second, compat_ptr(ptr));
310 case SHMAT:
311 return compat_sys_shmat(first, second, third,
312 0, compat_ptr(ptr));
313 case SHMDT:
314 return sys_shmdt(compat_ptr(ptr));
315 case SHMGET:
316 return sys_shmget(first, (unsigned)second, third);
317 case SHMCTL:
318 return compat_sys_shmctl(first, second, compat_ptr(ptr));
319 }
320
321 return -ENOSYS;
322}
323#endif
324
325asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
326{
327 if ((int)high < 0)
328 return -EINVAL;
329 else
330 return sys_truncate(path, (high << 32) | low);
331}
332
333asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
334{
335 if ((int)high < 0)
336 return -EINVAL;
337 else
338 return sys_ftruncate(fd, (high << 32) | low);
339}
340
341asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
342 struct compat_timespec __user *interval)
343{
344 struct timespec t;
345 int ret;
346 mm_segment_t old_fs = get_fs ();
347
348 set_fs (KERNEL_DS);
349 ret = sys_sched_rr_get_interval(pid,
350 (struct timespec __force __user *) &t);
351 set_fs (old_fs);
352 if (put_compat_timespec(&t, interval))
353 return -EFAULT;
354 return ret;
355}
356
357asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
358 compat_sigset_t __user *oset, size_t sigsetsize)
359{
360 sigset_t s;
361 compat_sigset_t s32;
362 int ret;
363 mm_segment_t old_fs = get_fs();
364
365 if (set) {
366 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
367 return -EFAULT;
368 switch (_NSIG_WORDS) {
369 case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
370 case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
371 case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
372 case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
373 }
374 }
375 set_fs (KERNEL_DS);
376 ret = sys_rt_sigprocmask(how,
377 set ? (sigset_t __force __user *) &s : NULL,
378 oset ? (sigset_t __force __user *) &s : NULL,
379 sigsetsize);
380 set_fs (old_fs);
381 if (ret) return ret;
382 if (oset) {
383 switch (_NSIG_WORDS) {
384 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
385 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
386 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
387 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
388 }
389 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
390 return -EFAULT;
391 }
392 return 0;
393}
394
395asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
396 size_t sigsetsize)
397{
398 sigset_t s;
399 compat_sigset_t s32;
400 int ret;
401 mm_segment_t old_fs = get_fs();
402
403 set_fs (KERNEL_DS);
404 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
405 set_fs (old_fs);
406 if (!ret) {
407 switch (_NSIG_WORDS) {
408 case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
409 case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
410 case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
411 case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
412 }
413 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
414 return -EFAULT;
415 }
416 return ret;
417}
418
419asmlinkage long
420sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
421{
422 siginfo_t info;
423 int ret;
424 mm_segment_t old_fs = get_fs();
425
426 if (copy_siginfo_from_user32(&info, uinfo))
427 return -EFAULT;
428 set_fs (KERNEL_DS);
429 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
430 set_fs (old_fs);
431 return ret;
432}
433
434/*
435 * sys32_execve() executes a new program after the asm stub has set
436 * things up for us. This should basically do what I want it to.
437 */
438asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
439 compat_uptr_t __user *envp)
440{
441 struct pt_regs *regs = task_pt_regs(current);
442 char *filename;
443 long rc;
444
445 filename = getname(name);
446 rc = PTR_ERR(filename);
447 if (IS_ERR(filename))
448 return rc;
449 rc = compat_do_execve(filename, argv, envp, regs);
450 if (rc)
451 goto out;
452 current->thread.fp_regs.fpc=0;
453 asm volatile("sfpc %0,0" : : "d" (0));
454 rc = regs->gprs[2];
455out:
456 putname(filename);
457 return rc;
458}
459
460asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
461 size_t count, u32 poshi, u32 poslo)
462{
463 if ((compat_ssize_t) count < 0)
464 return -EINVAL;
465 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
466}
467
468asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
469 size_t count, u32 poshi, u32 poslo)
470{
471 if ((compat_ssize_t) count < 0)
472 return -EINVAL;
473 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
474}
475
476asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
477{
478 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
479}
480
481asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
482{
483 mm_segment_t old_fs = get_fs();
484 int ret;
485 off_t of;
486
487 if (offset && get_user(of, offset))
488 return -EFAULT;
489
490 set_fs(KERNEL_DS);
491 ret = sys_sendfile(out_fd, in_fd,
492 offset ? (off_t __force __user *) &of : NULL, count);
493 set_fs(old_fs);
494
495 if (offset && put_user(of, offset))
496 return -EFAULT;
497
498 return ret;
499}
500
501asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
502 compat_loff_t __user *offset, s32 count)
503{
504 mm_segment_t old_fs = get_fs();
505 int ret;
506 loff_t lof;
507
508 if (offset && get_user(lof, offset))
509 return -EFAULT;
510
511 set_fs(KERNEL_DS);
512 ret = sys_sendfile64(out_fd, in_fd,
513 offset ? (loff_t __force __user *) &lof : NULL,
514 count);
515 set_fs(old_fs);
516
517 if (offset && put_user(lof, offset))
518 return -EFAULT;
519
520 return ret;
521}
522
523struct stat64_emu31 {
524 unsigned long long st_dev;
525 unsigned int __pad1;
526#define STAT64_HAS_BROKEN_ST_INO 1
527 u32 __st_ino;
528 unsigned int st_mode;
529 unsigned int st_nlink;
530 u32 st_uid;
531 u32 st_gid;
532 unsigned long long st_rdev;
533 unsigned int __pad3;
534 long st_size;
535 u32 st_blksize;
536 unsigned char __pad4[4];
537 u32 __pad5; /* future possible st_blocks high bits */
538 u32 st_blocks; /* Number 512-byte blocks allocated. */
539 u32 st_atime;
540 u32 __pad6;
541 u32 st_mtime;
542 u32 __pad7;
543 u32 st_ctime;
544 u32 __pad8; /* will be high 32 bits of ctime someday */
545 unsigned long st_ino;
546};
547
548static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
549{
550 struct stat64_emu31 tmp;
551
552 memset(&tmp, 0, sizeof(tmp));
553
554 tmp.st_dev = huge_encode_dev(stat->dev);
555 tmp.st_ino = stat->ino;
556 tmp.__st_ino = (u32)stat->ino;
557 tmp.st_mode = stat->mode;
558 tmp.st_nlink = (unsigned int)stat->nlink;
559 tmp.st_uid = stat->uid;
560 tmp.st_gid = stat->gid;
561 tmp.st_rdev = huge_encode_dev(stat->rdev);
562 tmp.st_size = stat->size;
563 tmp.st_blksize = (u32)stat->blksize;
564 tmp.st_blocks = (u32)stat->blocks;
565 tmp.st_atime = (u32)stat->atime.tv_sec;
566 tmp.st_mtime = (u32)stat->mtime.tv_sec;
567 tmp.st_ctime = (u32)stat->ctime.tv_sec;
568
569 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
570}
571
572asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
573{
574 struct kstat stat;
575 int ret = vfs_stat(filename, &stat);
576 if (!ret)
577 ret = cp_stat64(statbuf, &stat);
578 return ret;
579}
580
581asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
582{
583 struct kstat stat;
584 int ret = vfs_lstat(filename, &stat);
585 if (!ret)
586 ret = cp_stat64(statbuf, &stat);
587 return ret;
588}
589
590asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
591{
592 struct kstat stat;
593 int ret = vfs_fstat(fd, &stat);
594 if (!ret)
595 ret = cp_stat64(statbuf, &stat);
596 return ret;
597}
598
599asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
600 struct stat64_emu31 __user* statbuf, int flag)
601{
602 struct kstat stat;
603 int error;
604
605 error = vfs_fstatat(dfd, filename, &stat, flag);
606 if (error)
607 return error;
608 return cp_stat64(statbuf, &stat);
609}
610
611/*
612 * Linux/i386 didn't use to be able to handle more than
613 * 4 system call parameters, so these system calls used a memory
614 * block for parameter passing..
615 */
616
617struct mmap_arg_struct_emu31 {
618 compat_ulong_t addr;
619 compat_ulong_t len;
620 compat_ulong_t prot;
621 compat_ulong_t flags;
622 compat_ulong_t fd;
623 compat_ulong_t offset;
624};
625
626asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
627{
628 struct mmap_arg_struct_emu31 a;
629
630 if (copy_from_user(&a, arg, sizeof(a)))
631 return -EFAULT;
632 if (a.offset & ~PAGE_MASK)
633 return -EINVAL;
634 a.addr = (unsigned long) compat_ptr(a.addr);
635 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
636 a.offset >> PAGE_SHIFT);
637}
638
639asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
640{
641 struct mmap_arg_struct_emu31 a;
642
643 if (copy_from_user(&a, arg, sizeof(a)))
644 return -EFAULT;
645 a.addr = (unsigned long) compat_ptr(a.addr);
646 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
647}
648
649asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
650{
651 if ((compat_ssize_t) count < 0)
652 return -EINVAL;
653
654 return sys_read(fd, buf, count);
655}
656
657asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
658{
659 if ((compat_ssize_t) count < 0)
660 return -EINVAL;
661
662 return sys_write(fd, buf, count);
663}
664
665/*
666 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
667 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
668 * because the 31 bit values differ from the 64 bit values.
669 */
670
671asmlinkage long
672sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
673{
674 if (advise == 4)
675 advise = POSIX_FADV_DONTNEED;
676 else if (advise == 5)
677 advise = POSIX_FADV_NOREUSE;
678 return sys_fadvise64(fd, offset, len, advise);
679}
680
681struct fadvise64_64_args {
682 int fd;
683 long long offset;
684 long long len;
685 int advice;
686};
687
688asmlinkage long
689sys32_fadvise64_64(struct fadvise64_64_args __user *args)
690{
691 struct fadvise64_64_args a;
692
693 if ( copy_from_user(&a, args, sizeof(a)) )
694 return -EFAULT;
695 if (a.advice == 4)
696 a.advice = POSIX_FADV_DONTNEED;
697 else if (a.advice == 5)
698 a.advice = POSIX_FADV_NOREUSE;
699 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
700}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * S390 version
4 * Copyright IBM Corp. 2000
5 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
6 * Gerhard Tonn (ton@de.ibm.com)
7 * Thomas Spatzier (tspat@de.ibm.com)
8 *
9 * Conversion between 31bit and 64bit native syscalls.
10 *
11 * Heavily inspired by the 32-bit Sparc compat code which is
12 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
13 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
14 *
15 */
16
17
18#include <linux/kernel.h>
19#include <linux/sched.h>
20#include <linux/fs.h>
21#include <linux/mm.h>
22#include <linux/file.h>
23#include <linux/signal.h>
24#include <linux/resource.h>
25#include <linux/times.h>
26#include <linux/smp.h>
27#include <linux/sem.h>
28#include <linux/msg.h>
29#include <linux/shm.h>
30#include <linux/uio.h>
31#include <linux/quota.h>
32#include <linux/poll.h>
33#include <linux/personality.h>
34#include <linux/stat.h>
35#include <linux/filter.h>
36#include <linux/highmem.h>
37#include <linux/highuid.h>
38#include <linux/mman.h>
39#include <linux/ipv6.h>
40#include <linux/in.h>
41#include <linux/icmpv6.h>
42#include <linux/syscalls.h>
43#include <linux/sysctl.h>
44#include <linux/binfmts.h>
45#include <linux/capability.h>
46#include <linux/compat.h>
47#include <linux/vfs.h>
48#include <linux/ptrace.h>
49#include <linux/fadvise.h>
50#include <linux/ipc.h>
51#include <linux/slab.h>
52
53#include <asm/types.h>
54#include <linux/uaccess.h>
55
56#include <net/scm.h>
57#include <net/sock.h>
58
59#include "compat_linux.h"
60
61/* For this source file, we want overflow handling. */
62
63#undef high2lowuid
64#undef high2lowgid
65#undef low2highuid
66#undef low2highgid
67#undef SET_UID16
68#undef SET_GID16
69#undef NEW_TO_OLD_UID
70#undef NEW_TO_OLD_GID
71#undef SET_OLDSTAT_UID
72#undef SET_OLDSTAT_GID
73#undef SET_STAT_UID
74#undef SET_STAT_GID
75
76#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
77#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
78#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
79#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
80#define SET_UID16(var, uid) var = high2lowuid(uid)
81#define SET_GID16(var, gid) var = high2lowgid(gid)
82#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
83#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
84#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
85#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
86#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
87#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
88
89COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename,
90 u16, user, u16, group)
91{
92 return ksys_chown(filename, low2highuid(user), low2highgid(group));
93}
94
95COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *,
96 filename, u16, user, u16, group)
97{
98 return ksys_lchown(filename, low2highuid(user), low2highgid(group));
99}
100
101COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group)
102{
103 return ksys_fchown(fd, low2highuid(user), low2highgid(group));
104}
105
106COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid)
107{
108 return sys_setregid(low2highgid(rgid), low2highgid(egid));
109}
110
111COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid)
112{
113 return sys_setgid(low2highgid(gid));
114}
115
116COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid)
117{
118 return sys_setreuid(low2highuid(ruid), low2highuid(euid));
119}
120
121COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid)
122{
123 return sys_setuid(low2highuid(uid));
124}
125
126COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid)
127{
128 return sys_setresuid(low2highuid(ruid), low2highuid(euid),
129 low2highuid(suid));
130}
131
132COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp,
133 u16 __user *, euidp, u16 __user *, suidp)
134{
135 const struct cred *cred = current_cred();
136 int retval;
137 u16 ruid, euid, suid;
138
139 ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
140 euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
141 suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
142
143 if (!(retval = put_user(ruid, ruidp)) &&
144 !(retval = put_user(euid, euidp)))
145 retval = put_user(suid, suidp);
146
147 return retval;
148}
149
150COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid)
151{
152 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
153 low2highgid(sgid));
154}
155
156COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp,
157 u16 __user *, egidp, u16 __user *, sgidp)
158{
159 const struct cred *cred = current_cred();
160 int retval;
161 u16 rgid, egid, sgid;
162
163 rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
164 egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
165 sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
166
167 if (!(retval = put_user(rgid, rgidp)) &&
168 !(retval = put_user(egid, egidp)))
169 retval = put_user(sgid, sgidp);
170
171 return retval;
172}
173
174COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid)
175{
176 return sys_setfsuid(low2highuid(uid));
177}
178
179COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid)
180{
181 return sys_setfsgid(low2highgid(gid));
182}
183
184static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
185{
186 struct user_namespace *user_ns = current_user_ns();
187 int i;
188 u16 group;
189 kgid_t kgid;
190
191 for (i = 0; i < group_info->ngroups; i++) {
192 kgid = group_info->gid[i];
193 group = (u16)from_kgid_munged(user_ns, kgid);
194 if (put_user(group, grouplist+i))
195 return -EFAULT;
196 }
197
198 return 0;
199}
200
201static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
202{
203 struct user_namespace *user_ns = current_user_ns();
204 int i;
205 u16 group;
206 kgid_t kgid;
207
208 for (i = 0; i < group_info->ngroups; i++) {
209 if (get_user(group, grouplist+i))
210 return -EFAULT;
211
212 kgid = make_kgid(user_ns, (gid_t)group);
213 if (!gid_valid(kgid))
214 return -EINVAL;
215
216 group_info->gid[i] = kgid;
217 }
218
219 return 0;
220}
221
222COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist)
223{
224 const struct cred *cred = current_cred();
225 int i;
226
227 if (gidsetsize < 0)
228 return -EINVAL;
229
230 get_group_info(cred->group_info);
231 i = cred->group_info->ngroups;
232 if (gidsetsize) {
233 if (i > gidsetsize) {
234 i = -EINVAL;
235 goto out;
236 }
237 if (groups16_to_user(grouplist, cred->group_info)) {
238 i = -EFAULT;
239 goto out;
240 }
241 }
242out:
243 put_group_info(cred->group_info);
244 return i;
245}
246
247COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist)
248{
249 struct group_info *group_info;
250 int retval;
251
252 if (!may_setgroups())
253 return -EPERM;
254 if ((unsigned)gidsetsize > NGROUPS_MAX)
255 return -EINVAL;
256
257 group_info = groups_alloc(gidsetsize);
258 if (!group_info)
259 return -ENOMEM;
260 retval = groups16_from_user(group_info, grouplist);
261 if (retval) {
262 put_group_info(group_info);
263 return retval;
264 }
265
266 groups_sort(group_info);
267 retval = set_current_groups(group_info);
268 put_group_info(group_info);
269
270 return retval;
271}
272
273COMPAT_SYSCALL_DEFINE0(s390_getuid16)
274{
275 return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
276}
277
278COMPAT_SYSCALL_DEFINE0(s390_geteuid16)
279{
280 return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
281}
282
283COMPAT_SYSCALL_DEFINE0(s390_getgid16)
284{
285 return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
286}
287
288COMPAT_SYSCALL_DEFINE0(s390_getegid16)
289{
290 return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
291}
292
293#ifdef CONFIG_SYSVIPC
294COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
295 compat_ulong_t, third, compat_uptr_t, ptr)
296{
297 if (call >> 16) /* hack for backward compatibility */
298 return -EINVAL;
299 return compat_sys_ipc(call, first, second, third, ptr, third);
300}
301#endif
302
303COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
304{
305 return ksys_truncate(path, (unsigned long)high << 32 | low);
306}
307
308COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
309{
310 return ksys_ftruncate(fd, (unsigned long)high << 32 | low);
311}
312
313COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
314 compat_size_t, count, u32, high, u32, low)
315{
316 if ((compat_ssize_t) count < 0)
317 return -EINVAL;
318 return ksys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low);
319}
320
321COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
322 compat_size_t, count, u32, high, u32, low)
323{
324 if ((compat_ssize_t) count < 0)
325 return -EINVAL;
326 return ksys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);
327}
328
329COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
330{
331 return ksys_readahead(fd, (unsigned long)high << 32 | low, count);
332}
333
334struct stat64_emu31 {
335 unsigned long long st_dev;
336 unsigned int __pad1;
337#define STAT64_HAS_BROKEN_ST_INO 1
338 u32 __st_ino;
339 unsigned int st_mode;
340 unsigned int st_nlink;
341 u32 st_uid;
342 u32 st_gid;
343 unsigned long long st_rdev;
344 unsigned int __pad3;
345 long st_size;
346 u32 st_blksize;
347 unsigned char __pad4[4];
348 u32 __pad5; /* future possible st_blocks high bits */
349 u32 st_blocks; /* Number 512-byte blocks allocated. */
350 u32 st_atime;
351 u32 __pad6;
352 u32 st_mtime;
353 u32 __pad7;
354 u32 st_ctime;
355 u32 __pad8; /* will be high 32 bits of ctime someday */
356 unsigned long st_ino;
357};
358
359static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
360{
361 struct stat64_emu31 tmp;
362
363 memset(&tmp, 0, sizeof(tmp));
364
365 tmp.st_dev = huge_encode_dev(stat->dev);
366 tmp.st_ino = stat->ino;
367 tmp.__st_ino = (u32)stat->ino;
368 tmp.st_mode = stat->mode;
369 tmp.st_nlink = (unsigned int)stat->nlink;
370 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
371 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
372 tmp.st_rdev = huge_encode_dev(stat->rdev);
373 tmp.st_size = stat->size;
374 tmp.st_blksize = (u32)stat->blksize;
375 tmp.st_blocks = (u32)stat->blocks;
376 tmp.st_atime = (u32)stat->atime.tv_sec;
377 tmp.st_mtime = (u32)stat->mtime.tv_sec;
378 tmp.st_ctime = (u32)stat->ctime.tv_sec;
379
380 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
381}
382
383COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
384{
385 struct kstat stat;
386 int ret = vfs_stat(filename, &stat);
387 if (!ret)
388 ret = cp_stat64(statbuf, &stat);
389 return ret;
390}
391
392COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
393{
394 struct kstat stat;
395 int ret = vfs_lstat(filename, &stat);
396 if (!ret)
397 ret = cp_stat64(statbuf, &stat);
398 return ret;
399}
400
401COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
402{
403 struct kstat stat;
404 int ret = vfs_fstat(fd, &stat);
405 if (!ret)
406 ret = cp_stat64(statbuf, &stat);
407 return ret;
408}
409
410COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
411 struct stat64_emu31 __user *, statbuf, int, flag)
412{
413 struct kstat stat;
414 int error;
415
416 error = vfs_fstatat(dfd, filename, &stat, flag);
417 if (error)
418 return error;
419 return cp_stat64(statbuf, &stat);
420}
421
422/*
423 * Linux/i386 didn't use to be able to handle more than
424 * 4 system call parameters, so these system calls used a memory
425 * block for parameter passing..
426 */
427
428struct mmap_arg_struct_emu31 {
429 compat_ulong_t addr;
430 compat_ulong_t len;
431 compat_ulong_t prot;
432 compat_ulong_t flags;
433 compat_ulong_t fd;
434 compat_ulong_t offset;
435};
436
437COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
438{
439 struct mmap_arg_struct_emu31 a;
440
441 if (copy_from_user(&a, arg, sizeof(a)))
442 return -EFAULT;
443 if (a.offset & ~PAGE_MASK)
444 return -EINVAL;
445 return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
446 a.offset >> PAGE_SHIFT);
447}
448
449COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
450{
451 struct mmap_arg_struct_emu31 a;
452
453 if (copy_from_user(&a, arg, sizeof(a)))
454 return -EFAULT;
455 return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
456}
457
458COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
459{
460 if ((compat_ssize_t) count < 0)
461 return -EINVAL;
462
463 return ksys_read(fd, buf, count);
464}
465
466COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
467{
468 if ((compat_ssize_t) count < 0)
469 return -EINVAL;
470
471 return ksys_write(fd, buf, count);
472}
473
474/*
475 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
476 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
477 * because the 31 bit values differ from the 64 bit values.
478 */
479
480COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
481{
482 if (advise == 4)
483 advise = POSIX_FADV_DONTNEED;
484 else if (advise == 5)
485 advise = POSIX_FADV_NOREUSE;
486 return ksys_fadvise64_64(fd, (unsigned long)high << 32 | low, len,
487 advise);
488}
489
490struct fadvise64_64_args {
491 int fd;
492 long long offset;
493 long long len;
494 int advice;
495};
496
497COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
498{
499 struct fadvise64_64_args a;
500
501 if ( copy_from_user(&a, args, sizeof(a)) )
502 return -EFAULT;
503 if (a.advice == 4)
504 a.advice = POSIX_FADV_DONTNEED;
505 else if (a.advice == 5)
506 a.advice = POSIX_FADV_NOREUSE;
507 return ksys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
508}
509
510COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
511 u32, nhigh, u32, nlow, unsigned int, flags)
512{
513 return ksys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
514 ((u64)nhigh << 32) + nlow, flags);
515}
516
517COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
518 u32, lenhigh, u32, lenlow)
519{
520 return ksys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
521 ((u64)lenhigh << 32) + lenlow);
522}