2 * arch/s390x/kernel/linux32.c
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>
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>
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>
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. */
77 #undef SET_OLDSTAT_UID
78 #undef SET_OLDSTAT_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),
136 asmlinkage long sys32_getresuid16(u16 __user *ruid, u16 __user *euid, u16 __user *suid)
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);
147 asmlinkage long sys32_setresgid16(u16 rgid, u16 egid, u16 sgid)
149 return sys_setresgid(low2highgid(rgid), low2highgid(egid),
153 asmlinkage long sys32_getresgid16(u16 __user *rgid, u16 __user *egid, u16 __user *sgid)
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);
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 struct user_namespace *user_ns = current_user_ns();
181 for (i = 0; i < group_info->ngroups; i++) {
182 kgid = GROUP_AT(group_info, i);
183 group = (u16)from_kgid_munged(user_ns, kgid);
184 if (put_user(group, grouplist+i))
191 static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
193 struct user_namespace *user_ns = current_user_ns();
198 for (i = 0; i < group_info->ngroups; i++) {
199 if (get_user(group, grouplist+i))
202 kgid = make_kgid(user_ns, (gid_t)group);
203 if (!gid_valid(kgid))
206 GROUP_AT(group_info, i) = kgid;
212 asmlinkage long sys32_getgroups16(int gidsetsize, u16 __user *grouplist)
219 get_group_info(current->cred->group_info);
220 i = current->cred->group_info->ngroups;
222 if (i > gidsetsize) {
226 if (groups16_to_user(grouplist, current->cred->group_info)) {
232 put_group_info(current->cred->group_info);
236 asmlinkage long sys32_setgroups16(int gidsetsize, u16 __user *grouplist)
238 struct group_info *group_info;
241 if (!capable(CAP_SETGID))
243 if ((unsigned)gidsetsize > NGROUPS_MAX)
246 group_info = groups_alloc(gidsetsize);
249 retval = groups16_from_user(group_info, grouplist);
251 put_group_info(group_info);
255 retval = set_current_groups(group_info);
256 put_group_info(group_info);
261 asmlinkage long sys32_getuid16(void)
263 return high2lowuid(current->cred->uid);
266 asmlinkage long sys32_geteuid16(void)
268 return high2lowuid(current->cred->euid);
271 asmlinkage long sys32_getgid16(void)
273 return high2lowgid(current->cred->gid);
276 asmlinkage long sys32_getegid16(void)
278 return high2lowgid(current->cred->egid);
282 * sys32_ipc() is the de-multiplexer for the SysV IPC calls in 32bit emulation.
284 * This is really horribly ugly.
286 #ifdef CONFIG_SYSVIPC
287 asmlinkage long sys32_ipc(u32 call, int first, int second, int third, u32 ptr)
289 if (call >> 16) /* hack for backward compatibility */
293 return compat_sys_semtimedop(first, compat_ptr(ptr),
294 second, compat_ptr(third));
296 /* struct sembuf is the same on 32 and 64bit :)) */
297 return sys_semtimedop(first, compat_ptr(ptr),
300 return sys_semget(first, second, third);
302 return compat_sys_semctl(first, second, third,
305 return compat_sys_msgsnd(first, second, third,
308 return compat_sys_msgrcv(first, second, 0, third,
311 return sys_msgget((key_t) first, second);
313 return compat_sys_msgctl(first, second, compat_ptr(ptr));
315 return compat_sys_shmat(first, second, third,
318 return sys_shmdt(compat_ptr(ptr));
320 return sys_shmget(first, (unsigned)second, third);
322 return compat_sys_shmctl(first, second, compat_ptr(ptr));
329 asmlinkage long sys32_truncate64(const char __user * path, unsigned long high, unsigned long low)
334 return sys_truncate(path, (high << 32) | low);
337 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long high, unsigned long low)
342 return sys_ftruncate(fd, (high << 32) | low);
345 asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
346 struct compat_timespec __user *interval)
350 mm_segment_t old_fs = get_fs ();
353 ret = sys_sched_rr_get_interval(pid,
354 (struct timespec __force __user *) &t);
356 if (put_compat_timespec(&t, interval))
361 asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
362 compat_sigset_t __user *oset, size_t sigsetsize)
367 mm_segment_t old_fs = get_fs();
370 if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
372 s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
375 ret = sys_rt_sigprocmask(how,
376 set ? (sigset_t __force __user *) &s : NULL,
377 oset ? (sigset_t __force __user *) &s : NULL,
382 s32.sig[1] = (s.sig[0] >> 32);
383 s32.sig[0] = s.sig[0];
384 if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
390 asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
396 mm_segment_t old_fs = get_fs();
399 ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
402 s32.sig[1] = (s.sig[0] >> 32);
403 s32.sig[0] = s.sig[0];
404 if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
411 sys32_rt_sigqueueinfo(int pid, int sig, compat_siginfo_t __user *uinfo)
415 mm_segment_t old_fs = get_fs();
417 if (copy_siginfo_from_user32(&info, uinfo))
420 ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __force __user *) &info);
426 * sys32_execve() executes a new program after the asm stub has set
427 * things up for us. This should basically do what I want it to.
429 asmlinkage long sys32_execve(const char __user *name, compat_uptr_t __user *argv,
430 compat_uptr_t __user *envp)
432 struct pt_regs *regs = task_pt_regs(current);
436 filename = getname(name);
437 rc = PTR_ERR(filename);
438 if (IS_ERR(filename))
440 rc = compat_do_execve(filename, argv, envp, regs);
443 current->thread.fp_regs.fpc=0;
444 asm volatile("sfpc %0,0" : : "d" (0));
451 asmlinkage long sys32_pread64(unsigned int fd, char __user *ubuf,
452 size_t count, u32 poshi, u32 poslo)
454 if ((compat_ssize_t) count < 0)
456 return sys_pread64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
459 asmlinkage long sys32_pwrite64(unsigned int fd, const char __user *ubuf,
460 size_t count, u32 poshi, u32 poslo)
462 if ((compat_ssize_t) count < 0)
464 return sys_pwrite64(fd, ubuf, count, ((loff_t)AA(poshi) << 32) | AA(poslo));
467 asmlinkage compat_ssize_t sys32_readahead(int fd, u32 offhi, u32 offlo, s32 count)
469 return sys_readahead(fd, ((loff_t)AA(offhi) << 32) | AA(offlo), count);
472 asmlinkage long sys32_sendfile(int out_fd, int in_fd, compat_off_t __user *offset, size_t count)
474 mm_segment_t old_fs = get_fs();
478 if (offset && get_user(of, offset))
482 ret = sys_sendfile(out_fd, in_fd,
483 offset ? (off_t __force __user *) &of : NULL, count);
486 if (offset && put_user(of, offset))
492 asmlinkage long sys32_sendfile64(int out_fd, int in_fd,
493 compat_loff_t __user *offset, s32 count)
495 mm_segment_t old_fs = get_fs();
499 if (offset && get_user(lof, offset))
503 ret = sys_sendfile64(out_fd, in_fd,
504 offset ? (loff_t __force __user *) &lof : NULL,
508 if (offset && put_user(lof, offset))
514 struct stat64_emu31 {
515 unsigned long long st_dev;
517 #define STAT64_HAS_BROKEN_ST_INO 1
519 unsigned int st_mode;
520 unsigned int st_nlink;
523 unsigned long long st_rdev;
527 unsigned char __pad4[4];
528 u32 __pad5; /* future possible st_blocks high bits */
529 u32 st_blocks; /* Number 512-byte blocks allocated. */
535 u32 __pad8; /* will be high 32 bits of ctime someday */
536 unsigned long st_ino;
539 static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
541 struct stat64_emu31 tmp;
543 memset(&tmp, 0, sizeof(tmp));
545 tmp.st_dev = huge_encode_dev(stat->dev);
546 tmp.st_ino = stat->ino;
547 tmp.__st_ino = (u32)stat->ino;
548 tmp.st_mode = stat->mode;
549 tmp.st_nlink = (unsigned int)stat->nlink;
550 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
551 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
552 tmp.st_rdev = huge_encode_dev(stat->rdev);
553 tmp.st_size = stat->size;
554 tmp.st_blksize = (u32)stat->blksize;
555 tmp.st_blocks = (u32)stat->blocks;
556 tmp.st_atime = (u32)stat->atime.tv_sec;
557 tmp.st_mtime = (u32)stat->mtime.tv_sec;
558 tmp.st_ctime = (u32)stat->ctime.tv_sec;
560 return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
563 asmlinkage long sys32_stat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
566 int ret = vfs_stat(filename, &stat);
568 ret = cp_stat64(statbuf, &stat);
572 asmlinkage long sys32_lstat64(const char __user * filename, struct stat64_emu31 __user * statbuf)
575 int ret = vfs_lstat(filename, &stat);
577 ret = cp_stat64(statbuf, &stat);
581 asmlinkage long sys32_fstat64(unsigned long fd, struct stat64_emu31 __user * statbuf)
584 int ret = vfs_fstat(fd, &stat);
586 ret = cp_stat64(statbuf, &stat);
590 asmlinkage long sys32_fstatat64(unsigned int dfd, const char __user *filename,
591 struct stat64_emu31 __user* statbuf, int flag)
596 error = vfs_fstatat(dfd, filename, &stat, flag);
599 return cp_stat64(statbuf, &stat);
603 * Linux/i386 didn't use to be able to handle more than
604 * 4 system call parameters, so these system calls used a memory
605 * block for parameter passing..
608 struct mmap_arg_struct_emu31 {
612 compat_ulong_t flags;
614 compat_ulong_t offset;
617 asmlinkage unsigned long old32_mmap(struct mmap_arg_struct_emu31 __user *arg)
619 struct mmap_arg_struct_emu31 a;
621 if (copy_from_user(&a, arg, sizeof(a)))
623 if (a.offset & ~PAGE_MASK)
625 a.addr = (unsigned long) compat_ptr(a.addr);
626 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
627 a.offset >> PAGE_SHIFT);
630 asmlinkage long sys32_mmap2(struct mmap_arg_struct_emu31 __user *arg)
632 struct mmap_arg_struct_emu31 a;
634 if (copy_from_user(&a, arg, sizeof(a)))
636 a.addr = (unsigned long) compat_ptr(a.addr);
637 return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
640 asmlinkage long sys32_read(unsigned int fd, char __user * buf, size_t count)
642 if ((compat_ssize_t) count < 0)
645 return sys_read(fd, buf, count);
648 asmlinkage long sys32_write(unsigned int fd, const char __user * buf, size_t count)
650 if ((compat_ssize_t) count < 0)
653 return sys_write(fd, buf, count);
657 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
658 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
659 * because the 31 bit values differ from the 64 bit values.
663 sys32_fadvise64(int fd, loff_t offset, size_t len, int advise)
666 advise = POSIX_FADV_DONTNEED;
667 else if (advise == 5)
668 advise = POSIX_FADV_NOREUSE;
669 return sys_fadvise64(fd, offset, len, advise);
672 struct fadvise64_64_args {
680 sys32_fadvise64_64(struct fadvise64_64_args __user *args)
682 struct fadvise64_64_args a;
684 if ( copy_from_user(&a, args, sizeof(a)) )
687 a.advice = POSIX_FADV_DONTNEED;
688 else if (a.advice == 5)
689 a.advice = POSIX_FADV_NOREUSE;
690 return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);