[mirror_ubuntu-bionic-kernel.git] / arch / s390 / kernel / compat_linux.c

/*
 *  S390 version
 *    Copyright IBM Corp. 2000
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 *               Gerhard Tonn (ton@de.ibm.com)   
 *               Thomas Spatzier (tspat@de.ibm.com)
 *
 *  Conversion between 31bit and 64bit native syscalls.
 *
 * Heavily inspired by the 32-bit Sparc compat code which is 
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
 *
 */


#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h> 
#include <linux/mm.h> 
#include <linux/file.h> 
#include <linux/signal.h>
#include <linux/resource.h>
#include <linux/times.h>
#include <linux/smp.h>
#include <linux/sem.h>
#include <linux/msg.h>
#include <linux/shm.h>
#include <linux/uio.h>
#include <linux/quota.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/filter.h>
#include <linux/highmem.h>
#include <linux/highuid.h>
#include <linux/mman.h>
#include <linux/ipv6.h>
#include <linux/in.h>
#include <linux/icmpv6.h>
#include <linux/syscalls.h>
#include <linux/sysctl.h>
#include <linux/binfmts.h>
#include <linux/capability.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/fadvise.h>
#include <linux/ipc.h>
#include <linux/slab.h>

#include <asm/types.h>
#include <linux/uaccess.h>

#include <net/scm.h>
#include <net/sock.h>

#include "compat_linux.h"

/* For this source file, we want overflow handling. */

#undef high2lowuid
#undef high2lowgid
#undef low2highuid
#undef low2highgid
#undef SET_UID16
#undef SET_GID16
#undef NEW_TO_OLD_UID
#undef NEW_TO_OLD_GID
#undef SET_OLDSTAT_UID
#undef SET_OLDSTAT_GID
#undef SET_STAT_UID
#undef SET_STAT_GID

#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
#define SET_UID16(var, uid)	var = high2lowuid(uid)
#define SET_GID16(var, gid)	var = high2lowgid(gid)
#define NEW_TO_OLD_UID(uid)	high2lowuid(uid)
#define NEW_TO_OLD_GID(gid)	high2lowgid(gid)
#define SET_OLDSTAT_UID(stat, uid)	(stat).st_uid = high2lowuid(uid)
#define SET_OLDSTAT_GID(stat, gid)	(stat).st_gid = high2lowgid(gid)
#define SET_STAT_UID(stat, uid)		(stat).st_uid = high2lowuid(uid)
#define SET_STAT_GID(stat, gid)		(stat).st_gid = high2lowgid(gid)

COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename,
		       u16, user, u16, group)
{
	return sys_chown(filename, low2highuid(user), low2highgid(group));
}

COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *,
		       filename, u16, user, u16, group)
{
	return sys_lchown(filename, low2highuid(user), low2highgid(group));
}

COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group)
{
	return sys_fchown(fd, low2highuid(user), low2highgid(group));
}

COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid)
{
	return sys_setregid(low2highgid(rgid), low2highgid(egid));
}

COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid)
{
	return sys_setgid((gid_t)gid);
}

COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid)
{
	return sys_setreuid(low2highuid(ruid), low2highuid(euid));
}

COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid)
{
	return sys_setuid((uid_t)uid);
}

COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid)
{
	return sys_setresuid(low2highuid(ruid), low2highuid(euid),
			     low2highuid(suid));
}

COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp,
		       u16 __user *, euidp, u16 __user *, suidp)
{
	const struct cred *cred = current_cred();
	int retval;
	u16 ruid, euid, suid;

	ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
	euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
	suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));

	if (!(retval   = put_user(ruid, ruidp)) &&
	    !(retval   = put_user(euid, euidp)))
		retval = put_user(suid, suidp);

	return retval;
}

COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid)
{
	return sys_setresgid(low2highgid(rgid), low2highgid(egid),
			     low2highgid(sgid));
}

COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp,
		       u16 __user *, egidp, u16 __user *, sgidp)
{
	const struct cred *cred = current_cred();
	int retval;
	u16 rgid, egid, sgid;

	rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
	egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
	sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));

	if (!(retval   = put_user(rgid, rgidp)) &&
	    !(retval   = put_user(egid, egidp)))
		retval = put_user(sgid, sgidp);

	return retval;
}

COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid)
{
	return sys_setfsuid((uid_t)uid);
}

COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid)
{
	return sys_setfsgid((gid_t)gid);
}

static int groups16_to_user(u16 __user *grouplist, struct group_info *group_info)
{
	struct user_namespace *user_ns = current_user_ns();
	int i;
	u16 group;
	kgid_t kgid;

	for (i = 0; i < group_info->ngroups; i++) {
		kgid = group_info->gid[i];
		group = (u16)from_kgid_munged(user_ns, kgid);
		if (put_user(group, grouplist+i))
			return -EFAULT;
	}

	return 0;
}

static int groups16_from_user(struct group_info *group_info, u16 __user *grouplist)
{
	struct user_namespace *user_ns = current_user_ns();
	int i;
	u16 group;
	kgid_t kgid;

	for (i = 0; i < group_info->ngroups; i++) {
		if (get_user(group, grouplist+i))
			return  -EFAULT;

		kgid = make_kgid(user_ns, (gid_t)group);
		if (!gid_valid(kgid))
			return -EINVAL;

		group_info->gid[i] = kgid;
	}

	return 0;
}

COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist)
{
	const struct cred *cred = current_cred();
	int i;

	if (gidsetsize < 0)
		return -EINVAL;

	get_group_info(cred->group_info);
	i = cred->group_info->ngroups;
	if (gidsetsize) {
		if (i > gidsetsize) {
			i = -EINVAL;
			goto out;
		}
		if (groups16_to_user(grouplist, cred->group_info)) {
			i = -EFAULT;
			goto out;
		}
	}
out:
	put_group_info(cred->group_info);
	return i;
}

COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist)
{
	struct group_info *group_info;
	int retval;

	if (!may_setgroups())
		return -EPERM;
	if ((unsigned)gidsetsize > NGROUPS_MAX)
		return -EINVAL;

	group_info = groups_alloc(gidsetsize);
	if (!group_info)
		return -ENOMEM;
	retval = groups16_from_user(group_info, grouplist);
	if (retval) {
		put_group_info(group_info);
		return retval;
	}

	retval = set_current_groups(group_info);
	put_group_info(group_info);

	return retval;
}

COMPAT_SYSCALL_DEFINE0(s390_getuid16)
{
	return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
}

COMPAT_SYSCALL_DEFINE0(s390_geteuid16)
{
	return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
}

COMPAT_SYSCALL_DEFINE0(s390_getgid16)
{
	return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
}

COMPAT_SYSCALL_DEFINE0(s390_getegid16)
{
	return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
}

#ifdef CONFIG_SYSVIPC
COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
		compat_ulong_t, third, compat_uptr_t, ptr)
{
	if (call >> 16)		/* hack for backward compatibility */
		return -EINVAL;
	return compat_sys_ipc(call, first, second, third, ptr, third);
}
#endif

COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
{
	return sys_truncate(path, (unsigned long)high << 32 | low);
}

COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
{
	return sys_ftruncate(fd, (unsigned long)high << 32 | low);
}

COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
		       compat_size_t, count, u32, high, u32, low)
{
	if ((compat_ssize_t) count < 0)
		return -EINVAL;
	return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low);
}

COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
		       compat_size_t, count, u32, high, u32, low)
{
	if ((compat_ssize_t) count < 0)
		return -EINVAL;
	return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);
}

COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
{
	return sys_readahead(fd, (unsigned long)high << 32 | low, count);
}

struct stat64_emu31 {
	unsigned long long  st_dev;
	unsigned int    __pad1;
#define STAT64_HAS_BROKEN_ST_INO        1
	u32             __st_ino;
	unsigned int    st_mode;
	unsigned int    st_nlink;
	u32             st_uid;
	u32             st_gid;
	unsigned long long  st_rdev;
	unsigned int    __pad3;
	long            st_size;
	u32             st_blksize;
	unsigned char   __pad4[4];
	u32             __pad5;     /* future possible st_blocks high bits */
	u32             st_blocks;  /* Number 512-byte blocks allocated. */
	u32             st_atime;
	u32             __pad6;
	u32             st_mtime;
	u32             __pad7;
	u32             st_ctime;
	u32             __pad8;     /* will be high 32 bits of ctime someday */
	unsigned long   st_ino;
};	

static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
{
	struct stat64_emu31 tmp;

	memset(&tmp, 0, sizeof(tmp));

	tmp.st_dev = huge_encode_dev(stat->dev);
	tmp.st_ino = stat->ino;
	tmp.__st_ino = (u32)stat->ino;
	tmp.st_mode = stat->mode;
	tmp.st_nlink = (unsigned int)stat->nlink;
	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
	tmp.st_rdev = huge_encode_dev(stat->rdev);
	tmp.st_size = stat->size;
	tmp.st_blksize = (u32)stat->blksize;
	tmp.st_blocks = (u32)stat->blocks;
	tmp.st_atime = (u32)stat->atime.tv_sec;
	tmp.st_mtime = (u32)stat->mtime.tv_sec;
	tmp.st_ctime = (u32)stat->ctime.tv_sec;

	return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 
}

COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
{
	struct kstat stat;
	int ret = vfs_stat(filename, &stat);
	if (!ret)
		ret = cp_stat64(statbuf, &stat);
	return ret;
}

COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
{
	struct kstat stat;
	int ret = vfs_lstat(filename, &stat);
	if (!ret)
		ret = cp_stat64(statbuf, &stat);
	return ret;
}

COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
{
	struct kstat stat;
	int ret = vfs_fstat(fd, &stat);
	if (!ret)
		ret = cp_stat64(statbuf, &stat);
	return ret;
}

COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
		       struct stat64_emu31 __user *, statbuf, int, flag)
{
	struct kstat stat;
	int error;

	error = vfs_fstatat(dfd, filename, &stat, flag);
	if (error)
		return error;
	return cp_stat64(statbuf, &stat);
}

/*
 * Linux/i386 didn't use to be able to handle more than
 * 4 system call parameters, so these system calls used a memory
 * block for parameter passing..
 */

struct mmap_arg_struct_emu31 {
	compat_ulong_t addr;
	compat_ulong_t len;
	compat_ulong_t prot;
	compat_ulong_t flags;
	compat_ulong_t fd;
	compat_ulong_t offset;
};

COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
{
	struct mmap_arg_struct_emu31 a;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;
	if (a.offset & ~PAGE_MASK)
		return -EINVAL;
	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
			      a.offset >> PAGE_SHIFT);
}

COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
{
	struct mmap_arg_struct_emu31 a;

	if (copy_from_user(&a, arg, sizeof(a)))
		return -EFAULT;
	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
}

COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
{
	if ((compat_ssize_t) count < 0)
		return -EINVAL; 

	return sys_read(fd, buf, count);
}

COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
{
	if ((compat_ssize_t) count < 0)
		return -EINVAL; 

	return sys_write(fd, buf, count);
}

/*
 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 * because the 31 bit values differ from the 64 bit values.
 */

COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
{
	if (advise == 4)
		advise = POSIX_FADV_DONTNEED;
	else if (advise == 5)
		advise = POSIX_FADV_NOREUSE;
	return sys_fadvise64(fd, (unsigned long)high << 32 | low, len, advise);
}

struct fadvise64_64_args {
	int fd;
	long long offset;
	long long len;
	int advice;
};

COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
{
	struct fadvise64_64_args a;

	if ( copy_from_user(&a, args, sizeof(a)) )
		return -EFAULT;
	if (a.advice == 4)
		a.advice = POSIX_FADV_DONTNEED;
	else if (a.advice == 5)
		a.advice = POSIX_FADV_NOREUSE;
	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
}

COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
		       u32, nhigh, u32, nlow, unsigned int, flags)
{
	return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
				   ((u64)nhigh << 32) + nlow, flags);
}

COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
		       u32, lenhigh, u32, lenlow)
{
	return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
			     ((u64)lenhigh << 32) + lenlow);
}
Commit	Line	Data
1da177e4	1	/*
1da177e4	2	* S390 version
a53c8fab	3	* Copyright IBM Corp. 2000
1da177e4 LT	4	* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
	5	* Gerhard Tonn (ton@de.ibm.com)
	6	* Thomas Spatzier (tspat@de.ibm.com)
	7	*
	8	* Conversion between 31bit and 64bit native syscalls.
	9	*
	10	* Heavily inspired by the 32-bit Sparc compat code which is
	11	* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
	12	* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
	13	*
	14	*/
	15
	16
1da177e4 LT	17	#include <linux/kernel.h>
	18	#include <linux/sched.h>
	19	#include <linux/fs.h>
	20	#include <linux/mm.h>
	21	#include <linux/file.h>
	22	#include <linux/signal.h>
	23	#include <linux/resource.h>
	24	#include <linux/times.h>
1da177e4	25	#include <linux/smp.h>
1da177e4 LT	26	#include <linux/sem.h>
	27	#include <linux/msg.h>
	28	#include <linux/shm.h>
1da177e4	29	#include <linux/uio.h>
1da177e4	30	#include <linux/quota.h>
1da177e4 LT	31	#include <linux/poll.h>
	32	#include <linux/personality.h>
	33	#include <linux/stat.h>
	34	#include <linux/filter.h>
	35	#include <linux/highmem.h>
	36	#include <linux/highuid.h>
	37	#include <linux/mman.h>
	38	#include <linux/ipv6.h>
	39	#include <linux/in.h>
	40	#include <linux/icmpv6.h>
	41	#include <linux/syscalls.h>
	42	#include <linux/sysctl.h>
	43	#include <linux/binfmts.h>
a9415644	44	#include <linux/capability.h>
1da177e4 LT	45	#include <linux/compat.h>
	46	#include <linux/vfs.h>
	47	#include <linux/ptrace.h>
068e1b94	48	#include <linux/fadvise.h>
cba4fbbf	49	#include <linux/ipc.h>
5a0e3ad6	50	#include <linux/slab.h>
1da177e4 LT	51
1da177e4 LT	52	#include <asm/types.h>
7c0f6ba6	53	#include <linux/uaccess.h>
1da177e4 LT	54
	55	#include <net/scm.h>
	56	#include <net/sock.h>
	57
	58	#include "compat_linux.h"
	59
1da177e4 LT	60	/* For this source file, we want overflow handling. */
	61
	62	#undef high2lowuid
	63	#undef high2lowgid
	64	#undef low2highuid
	65	#undef low2highgid
	66	#undef SET_UID16
	67	#undef SET_GID16
	68	#undef NEW_TO_OLD_UID
	69	#undef NEW_TO_OLD_GID
	70	#undef SET_OLDSTAT_UID
	71	#undef SET_OLDSTAT_GID
	72	#undef SET_STAT_UID
	73	#undef SET_STAT_GID
	74
	75	#define high2lowuid(uid) ((uid) > 65535) ? (u16)overflowuid : (u16)(uid)
	76	#define high2lowgid(gid) ((gid) > 65535) ? (u16)overflowgid : (u16)(gid)
	77	#define low2highuid(uid) ((uid) == (u16)-1) ? (uid_t)-1 : (uid_t)(uid)
	78	#define low2highgid(gid) ((gid) == (u16)-1) ? (gid_t)-1 : (gid_t)(gid)
	79	#define SET_UID16(var, uid) var = high2lowuid(uid)
	80	#define SET_GID16(var, gid) var = high2lowgid(gid)
	81	#define NEW_TO_OLD_UID(uid) high2lowuid(uid)
	82	#define NEW_TO_OLD_GID(gid) high2lowgid(gid)
	83	#define SET_OLDSTAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
	84	#define SET_OLDSTAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
	85	#define SET_STAT_UID(stat, uid) (stat).st_uid = high2lowuid(uid)
	86	#define SET_STAT_GID(stat, gid) (stat).st_gid = high2lowgid(gid)
	87
c6c0f58f HC	88	COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename,
c6c0f58f HC	89	u16, user, u16, group)
1da177e4 LT	90	{
	91	return sys_chown(filename, low2highuid(user), low2highgid(group));
	92	}
	93
c6c0f58f HC	94	COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *,
c6c0f58f HC	95	filename, u16, user, u16, group)
1da177e4 LT	96	{
	97	return sys_lchown(filename, low2highuid(user), low2highgid(group));
	98	}
	99
c6c0f58f	100	COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group)
1da177e4 LT	101	{
	102	return sys_fchown(fd, low2highuid(user), low2highgid(group));
	103	}
	104
c6c0f58f	105	COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid)
1da177e4 LT	106	{
	107	return sys_setregid(low2highgid(rgid), low2highgid(egid));
	108	}
	109
c6c0f58f	110	COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid)
1da177e4 LT	111	{
	112	return sys_setgid((gid_t)gid);
	113	}
	114
208096ee	115	COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid)
1da177e4 LT	116	{
	117	return sys_setreuid(low2highuid(ruid), low2highuid(euid));
	118	}
	119
208096ee	120	COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid)
1da177e4 LT	121	{
	122	return sys_setuid((uid_t)uid);
	123	}
	124
208096ee	125	COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid)
1da177e4 LT	126	{
1da177e4 LT	127	return sys_setresuid(low2highuid(ruid), low2highuid(euid),
208096ee	128	low2highuid(suid));
1da177e4 LT	129	}
1da177e4 LT	130
208096ee HC	131	COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp,
208096ee HC	132	u16 __user , euidp, u16 __user , suidp)
1da177e4	133	{
558a4479	134	const struct cred *cred = current_cred();
1da177e4	135	int retval;
558a4479	136	u16 ruid, euid, suid;
1da177e4	137
558a4479 EB	138	ruid = high2lowuid(from_kuid_munged(cred->user_ns, cred->uid));
	139	euid = high2lowuid(from_kuid_munged(cred->user_ns, cred->euid));
	140	suid = high2lowuid(from_kuid_munged(cred->user_ns, cred->suid));
	141
	142	if (!(retval = put_user(ruid, ruidp)) &&
	143	!(retval = put_user(euid, euidp)))
	144	retval = put_user(suid, suidp);
1da177e4 LT	145
	146	return retval;
	147	}
	148
208096ee	149	COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid)
1da177e4 LT	150	{
1da177e4 LT	151	return sys_setresgid(low2highgid(rgid), low2highgid(egid),
208096ee	152	low2highgid(sgid));
1da177e4 LT	153	}
1da177e4 LT	154
4ca2ea58 HC	155	COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp,
4ca2ea58 HC	156	u16 __user , egidp, u16 __user , sgidp)
1da177e4	157	{
558a4479	158	const struct cred *cred = current_cred();
1da177e4	159	int retval;
558a4479 EB	160	u16 rgid, egid, sgid;
	161
	162	rgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->gid));
	163	egid = high2lowgid(from_kgid_munged(cred->user_ns, cred->egid));
	164	sgid = high2lowgid(from_kgid_munged(cred->user_ns, cred->sgid));
1da177e4	165
558a4479 EB	166	if (!(retval = put_user(rgid, rgidp)) &&
	167	!(retval = put_user(egid, egidp)))
	168	retval = put_user(sgid, sgidp);
1da177e4 LT	169
	170	return retval;
	171	}
	172
4ca2ea58	173	COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid)
1da177e4 LT	174	{
	175	return sys_setfsuid((uid_t)uid);
	176	}
	177
4ca2ea58	178	COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid)
1da177e4 LT	179	{
	180	return sys_setfsgid((gid_t)gid);
	181	}
	182
24954a14	183	static int groups16_to_user(u16 __user grouplist, struct group_info group_info)
1da177e4	184	{
ae2975bc	185	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	186	int i;
1da177e4 LT	187	u16 group;
ae2975bc	188	kgid_t kgid;
1da177e4 LT	189
1da177e4 LT	190	for (i = 0; i < group_info->ngroups; i++) {
81243eac	191	kgid = group_info->gid[i];
ae2975bc	192	group = (u16)from_kgid_munged(user_ns, kgid);
1da177e4 LT	193	if (put_user(group, grouplist+i))
	194	return -EFAULT;
	195	}
	196
	197	return 0;
	198	}
	199
24954a14	200	static int groups16_from_user(struct group_info group_info, u16 __user grouplist)
1da177e4	201	{
ae2975bc	202	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	203	int i;
1da177e4 LT	204	u16 group;
ae2975bc	205	kgid_t kgid;
1da177e4 LT	206
	207	for (i = 0; i < group_info->ngroups; i++) {
	208	if (get_user(group, grouplist+i))
	209	return -EFAULT;
ae2975bc EB	210
	211	kgid = make_kgid(user_ns, (gid_t)group);
	212	if (!gid_valid(kgid))
	213	return -EINVAL;
	214
81243eac	215	group_info->gid[i] = kgid;
1da177e4 LT	216	}
	217
	218	return 0;
	219	}
	220
4ca2ea58	221	COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist)
1da177e4	222	{
2ec7f4ae	223	const struct cred *cred = current_cred();
1da177e4 LT	224	int i;
	225
	226	if (gidsetsize < 0)
	227	return -EINVAL;
	228
2ec7f4ae HC	229	get_group_info(cred->group_info);
2ec7f4ae HC	230	i = cred->group_info->ngroups;
1da177e4 LT	231	if (gidsetsize) {
	232	if (i > gidsetsize) {
	233	i = -EINVAL;
	234	goto out;
	235	}
2ec7f4ae	236	if (groups16_to_user(grouplist, cred->group_info)) {
1da177e4 LT	237	i = -EFAULT;
	238	goto out;
	239	}
	240	}
	241	out:
2ec7f4ae	242	put_group_info(cred->group_info);
1da177e4 LT	243	return i;
	244	}
	245
4ca2ea58	246	COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist)
1da177e4 LT	247	{
	248	struct group_info *group_info;
	249	int retval;
	250
7ff4d90b	251	if (!may_setgroups())
1da177e4 LT	252	return -EPERM;
	253	if ((unsigned)gidsetsize > NGROUPS_MAX)
	254	return -EINVAL;
	255
	256	group_info = groups_alloc(gidsetsize);
	257	if (!group_info)
	258	return -ENOMEM;
	259	retval = groups16_from_user(group_info, grouplist);
	260	if (retval) {
	261	put_group_info(group_info);
	262	return retval;
	263	}
	264
	265	retval = set_current_groups(group_info);
	266	put_group_info(group_info);
	267
	268	return retval;
	269	}
	270
e723e0cc	271	COMPAT_SYSCALL_DEFINE0(s390_getuid16)
1da177e4	272	{
558a4479	273	return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
1da177e4 LT	274	}
1da177e4 LT	275
e723e0cc	276	COMPAT_SYSCALL_DEFINE0(s390_geteuid16)
1da177e4	277	{
558a4479	278	return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
1da177e4 LT	279	}
1da177e4 LT	280
e723e0cc	281	COMPAT_SYSCALL_DEFINE0(s390_getgid16)
1da177e4	282	{
558a4479	283	return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
1da177e4 LT	284	}
1da177e4 LT	285
e723e0cc	286	COMPAT_SYSCALL_DEFINE0(s390_getegid16)
1da177e4	287	{
558a4479	288	return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
1da177e4 LT	289	}
1da177e4 LT	290
1df23957	291	#ifdef CONFIG_SYSVIPC
49382d93 HC	292	COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
49382d93 HC	293	compat_ulong_t, third, compat_uptr_t, ptr)
1da177e4 LT	294	{
	295	if (call >> 16) /* hack for backward compatibility */
	296	return -EINVAL;
56e41d3c	297	return compat_sys_ipc(call, first, second, third, ptr, third);
1da177e4	298	}
1df23957	299	#endif
1da177e4	300
e723e0cc	301	COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
1da177e4	302	{
e723e0cc	303	return sys_truncate(path, (unsigned long)high << 32 \| low);
1da177e4 LT	304	}
1da177e4 LT	305
52a0b536	306	COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
1da177e4	307	{
52a0b536	308	return sys_ftruncate(fd, (unsigned long)high << 32 \| low);
1da177e4 LT	309	}
1da177e4 LT	310
52a0b536 HC	311	COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
52a0b536 HC	312	compat_size_t, count, u32, high, u32, low)
1da177e4 LT	313	{
	314	if ((compat_ssize_t) count < 0)
	315	return -EINVAL;
52a0b536	316	return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 \| low);
1da177e4 LT	317	}
1da177e4 LT	318
52a0b536 HC	319	COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
52a0b536 HC	320	compat_size_t, count, u32, high, u32, low)
1da177e4 LT	321	{
	322	if ((compat_ssize_t) count < 0)
	323	return -EINVAL;
52a0b536	324	return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 \| low);
1da177e4 LT	325	}
1da177e4 LT	326
52a0b536	327	COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
1da177e4	328	{
52a0b536	329	return sys_readahead(fd, (unsigned long)high << 32 \| low, count);
1da177e4 LT	330	}
1da177e4 LT	331
1da177e4 LT	332	struct stat64_emu31 {
	333	unsigned long long st_dev;
	334	unsigned int __pad1;
	335	#define STAT64_HAS_BROKEN_ST_INO 1
	336	u32 __st_ino;
	337	unsigned int st_mode;
	338	unsigned int st_nlink;
	339	u32 st_uid;
	340	u32 st_gid;
	341	unsigned long long st_rdev;
	342	unsigned int __pad3;
	343	long st_size;
	344	u32 st_blksize;
	345	unsigned char __pad4[4];
	346	u32 __pad5; /* future possible st_blocks high bits */
	347	u32 st_blocks; /* Number 512-byte blocks allocated. */
	348	u32 st_atime;
	349	u32 __pad6;
	350	u32 st_mtime;
	351	u32 __pad7;
	352	u32 st_ctime;
	353	u32 __pad8; /* will be high 32 bits of ctime someday */
	354	unsigned long st_ino;
	355	};
	356
24954a14	357	static int cp_stat64(struct stat64_emu31 __user ubuf, struct kstat stat)
1da177e4 LT	358	{
	359	struct stat64_emu31 tmp;
	360
	361	memset(&tmp, 0, sizeof(tmp));
	362
	363	tmp.st_dev = huge_encode_dev(stat->dev);
	364	tmp.st_ino = stat->ino;
	365	tmp.__st_ino = (u32)stat->ino;
	366	tmp.st_mode = stat->mode;
	367	tmp.st_nlink = (unsigned int)stat->nlink;
a7c1938e EB	368	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
a7c1938e EB	369	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
1da177e4 LT	370	tmp.st_rdev = huge_encode_dev(stat->rdev);
	371	tmp.st_size = stat->size;
	372	tmp.st_blksize = (u32)stat->blksize;
	373	tmp.st_blocks = (u32)stat->blocks;
	374	tmp.st_atime = (u32)stat->atime.tv_sec;
	375	tmp.st_mtime = (u32)stat->mtime.tv_sec;
	376	tmp.st_ctime = (u32)stat->ctime.tv_sec;
	377
	378	return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	379	}
	380
52a0b536	381	COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user , filename, struct stat64_emu31 __user , statbuf)
1da177e4 LT	382	{
	383	struct kstat stat;
	384	int ret = vfs_stat(filename, &stat);
	385	if (!ret)
	386	ret = cp_stat64(statbuf, &stat);
	387	return ret;
	388	}
	389
a0f8c6da	390	COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user , filename, struct stat64_emu31 __user , statbuf)
1da177e4 LT	391	{
	392	struct kstat stat;
	393	int ret = vfs_lstat(filename, &stat);
	394	if (!ret)
	395	ret = cp_stat64(statbuf, &stat);
	396	return ret;
	397	}
	398
a0f8c6da	399	COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
1da177e4 LT	400	{
	401	struct kstat stat;
	402	int ret = vfs_fstat(fd, &stat);
	403	if (!ret)
	404	ret = cp_stat64(statbuf, &stat);
	405	return ret;
	406	}
	407
a0f8c6da HC	408	COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
a0f8c6da HC	409	struct stat64_emu31 __user *, statbuf, int, flag)
19bf9cbf HC	410	{
19bf9cbf HC	411	struct kstat stat;
0112fc22	412	int error;
19bf9cbf	413
0112fc22 OD	414	error = vfs_fstatat(dfd, filename, &stat, flag);
	415	if (error)
	416	return error;
	417	return cp_stat64(statbuf, &stat);
19bf9cbf HC	418	}
19bf9cbf HC	419
1da177e4 LT	420	/*
	421	* Linux/i386 didn't use to be able to handle more than
	422	* 4 system call parameters, so these system calls used a memory
	423	* block for parameter passing..
	424	*/
	425
	426	struct mmap_arg_struct_emu31 {
d3815898 HC	427	compat_ulong_t addr;
	428	compat_ulong_t len;
	429	compat_ulong_t prot;
	430	compat_ulong_t flags;
	431	compat_ulong_t fd;
	432	compat_ulong_t offset;
1da177e4 LT	433	};
1da177e4 LT	434
a0f8c6da	435	COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
1da177e4 LT	436	{
1da177e4 LT	437	struct mmap_arg_struct_emu31 a;
1da177e4 LT	438
1da177e4 LT	439	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	440	return -EFAULT;
1da177e4	441	if (a.offset & ~PAGE_MASK)
d3815898	442	return -EINVAL;
d3815898 HC	443	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
d3815898 HC	444	a.offset >> PAGE_SHIFT);
1da177e4 LT	445	}
1da177e4 LT	446
a0f8c6da	447	COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
1da177e4 LT	448	{
1da177e4 LT	449	struct mmap_arg_struct_emu31 a;
1da177e4 LT	450
1da177e4 LT	451	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	452	return -EFAULT;
d3815898	453	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
1da177e4 LT	454	}
1da177e4 LT	455
5383d2c8	456	COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
1da177e4 LT	457	{
	458	if ((compat_ssize_t) count < 0)
	459	return -EINVAL;
	460
	461	return sys_read(fd, buf, count);
	462	}
	463
5383d2c8	464	COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
1da177e4 LT	465	{
	466	if ((compat_ssize_t) count < 0)
	467	return -EINVAL;
	468
	469	return sys_write(fd, buf, count);
	470	}
	471
068e1b94 MS	472	/*
	473	* 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
	474	* These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
	475	* because the 31 bit values differ from the 64 bit values.
	476	*/
	477
5383d2c8	478	COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
068e1b94 MS	479	{
	480	if (advise == 4)
	481	advise = POSIX_FADV_DONTNEED;
	482	else if (advise == 5)
	483	advise = POSIX_FADV_NOREUSE;
5383d2c8	484	return sys_fadvise64(fd, (unsigned long)high << 32 \| low, len, advise);
068e1b94 MS	485	}
	486
	487	struct fadvise64_64_args {
	488	int fd;
	489	long long offset;
	490	long long len;
	491	int advice;
	492	};
	493
5383d2c8	494	COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
068e1b94 MS	495	{
	496	struct fadvise64_64_args a;
	497
	498	if ( copy_from_user(&a, args, sizeof(a)) )
	499	return -EFAULT;
	500	if (a.advice == 4)
	501	a.advice = POSIX_FADV_DONTNEED;
	502	else if (a.advice == 5)
	503	a.advice = POSIX_FADV_NOREUSE;
	504	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
	505	}
2c81fc4f HC	506
	507	COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
	508	u32, nhigh, u32, nlow, unsigned int, flags)
	509	{
	510	return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
	511	((u64)nhigh << 32) + nlow, flags);
	512	}
	513
	514	COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
	515	u32, lenhigh, u32, lenlow)
	516	{
	517	return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
	518	((u64)lenhigh << 32) + lenlow);
	519	}