[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/module.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 LT	30	#include <linux/quota.h>
1da177e4 LT	31	#include <linux/module.h>
1da177e4 LT	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>
a9415644	45	#include <linux/capability.h>
1da177e4 LT	46	#include <linux/compat.h>
	47	#include <linux/vfs.h>
	48	#include <linux/ptrace.h>
068e1b94	49	#include <linux/fadvise.h>
cba4fbbf	50	#include <linux/ipc.h>
5a0e3ad6	51	#include <linux/slab.h>
1da177e4 LT	52
1da177e4 LT	53	#include <asm/types.h>
7c0f6ba6	54	#include <linux/uaccess.h>
1da177e4 LT	55
	56	#include <net/scm.h>
	57	#include <net/sock.h>
	58
	59	#include "compat_linux.h"
	60
1da177e4 LT	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
c6c0f58f HC	89	COMPAT_SYSCALL_DEFINE3(s390_chown16, const char __user *, filename,
c6c0f58f HC	90	u16, user, u16, group)
1da177e4 LT	91	{
	92	return sys_chown(filename, low2highuid(user), low2highgid(group));
	93	}
	94
c6c0f58f HC	95	COMPAT_SYSCALL_DEFINE3(s390_lchown16, const char __user *,
c6c0f58f HC	96	filename, u16, user, u16, group)
1da177e4 LT	97	{
	98	return sys_lchown(filename, low2highuid(user), low2highgid(group));
	99	}
	100
c6c0f58f	101	COMPAT_SYSCALL_DEFINE3(s390_fchown16, unsigned int, fd, u16, user, u16, group)
1da177e4 LT	102	{
	103	return sys_fchown(fd, low2highuid(user), low2highgid(group));
	104	}
	105
c6c0f58f	106	COMPAT_SYSCALL_DEFINE2(s390_setregid16, u16, rgid, u16, egid)
1da177e4 LT	107	{
	108	return sys_setregid(low2highgid(rgid), low2highgid(egid));
	109	}
	110
c6c0f58f	111	COMPAT_SYSCALL_DEFINE1(s390_setgid16, u16, gid)
1da177e4 LT	112	{
	113	return sys_setgid((gid_t)gid);
	114	}
	115
208096ee	116	COMPAT_SYSCALL_DEFINE2(s390_setreuid16, u16, ruid, u16, euid)
1da177e4 LT	117	{
	118	return sys_setreuid(low2highuid(ruid), low2highuid(euid));
	119	}
	120
208096ee	121	COMPAT_SYSCALL_DEFINE1(s390_setuid16, u16, uid)
1da177e4 LT	122	{
	123	return sys_setuid((uid_t)uid);
	124	}
	125
208096ee	126	COMPAT_SYSCALL_DEFINE3(s390_setresuid16, u16, ruid, u16, euid, u16, suid)
1da177e4 LT	127	{
1da177e4 LT	128	return sys_setresuid(low2highuid(ruid), low2highuid(euid),
208096ee	129	low2highuid(suid));
1da177e4 LT	130	}
1da177e4 LT	131
208096ee HC	132	COMPAT_SYSCALL_DEFINE3(s390_getresuid16, u16 __user *, ruidp,
208096ee HC	133	u16 __user , euidp, u16 __user , suidp)
1da177e4	134	{
558a4479	135	const struct cred *cred = current_cred();
1da177e4	136	int retval;
558a4479	137	u16 ruid, euid, suid;
1da177e4	138
558a4479 EB	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);
1da177e4 LT	146
	147	return retval;
	148	}
	149
208096ee	150	COMPAT_SYSCALL_DEFINE3(s390_setresgid16, u16, rgid, u16, egid, u16, sgid)
1da177e4 LT	151	{
1da177e4 LT	152	return sys_setresgid(low2highgid(rgid), low2highgid(egid),
208096ee	153	low2highgid(sgid));
1da177e4 LT	154	}
1da177e4 LT	155
4ca2ea58 HC	156	COMPAT_SYSCALL_DEFINE3(s390_getresgid16, u16 __user *, rgidp,
4ca2ea58 HC	157	u16 __user , egidp, u16 __user , sgidp)
1da177e4	158	{
558a4479	159	const struct cred *cred = current_cred();
1da177e4	160	int retval;
558a4479 EB	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));
1da177e4	166
558a4479 EB	167	if (!(retval = put_user(rgid, rgidp)) &&
	168	!(retval = put_user(egid, egidp)))
	169	retval = put_user(sgid, sgidp);
1da177e4 LT	170
	171	return retval;
	172	}
	173
4ca2ea58	174	COMPAT_SYSCALL_DEFINE1(s390_setfsuid16, u16, uid)
1da177e4 LT	175	{
	176	return sys_setfsuid((uid_t)uid);
	177	}
	178
4ca2ea58	179	COMPAT_SYSCALL_DEFINE1(s390_setfsgid16, u16, gid)
1da177e4 LT	180	{
	181	return sys_setfsgid((gid_t)gid);
	182	}
	183
24954a14	184	static int groups16_to_user(u16 __user grouplist, struct group_info group_info)
1da177e4	185	{
ae2975bc	186	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	187	int i;
1da177e4 LT	188	u16 group;
ae2975bc	189	kgid_t kgid;
1da177e4 LT	190
1da177e4 LT	191	for (i = 0; i < group_info->ngroups; i++) {
81243eac	192	kgid = group_info->gid[i];
ae2975bc	193	group = (u16)from_kgid_munged(user_ns, kgid);
1da177e4 LT	194	if (put_user(group, grouplist+i))
	195	return -EFAULT;
	196	}
	197
	198	return 0;
	199	}
	200
24954a14	201	static int groups16_from_user(struct group_info group_info, u16 __user grouplist)
1da177e4	202	{
ae2975bc	203	struct user_namespace *user_ns = current_user_ns();
1da177e4 LT	204	int i;
1da177e4 LT	205	u16 group;
ae2975bc	206	kgid_t kgid;
1da177e4 LT	207
	208	for (i = 0; i < group_info->ngroups; i++) {
	209	if (get_user(group, grouplist+i))
	210	return -EFAULT;
ae2975bc EB	211
	212	kgid = make_kgid(user_ns, (gid_t)group);
	213	if (!gid_valid(kgid))
	214	return -EINVAL;
	215
81243eac	216	group_info->gid[i] = kgid;
1da177e4 LT	217	}
	218
	219	return 0;
	220	}
	221
4ca2ea58	222	COMPAT_SYSCALL_DEFINE2(s390_getgroups16, int, gidsetsize, u16 __user *, grouplist)
1da177e4	223	{
2ec7f4ae	224	const struct cred *cred = current_cred();
1da177e4 LT	225	int i;
	226
	227	if (gidsetsize < 0)
	228	return -EINVAL;
	229
2ec7f4ae HC	230	get_group_info(cred->group_info);
2ec7f4ae HC	231	i = cred->group_info->ngroups;
1da177e4 LT	232	if (gidsetsize) {
	233	if (i > gidsetsize) {
	234	i = -EINVAL;
	235	goto out;
	236	}
2ec7f4ae	237	if (groups16_to_user(grouplist, cred->group_info)) {
1da177e4 LT	238	i = -EFAULT;
	239	goto out;
	240	}
	241	}
	242	out:
2ec7f4ae	243	put_group_info(cred->group_info);
1da177e4 LT	244	return i;
	245	}
	246
4ca2ea58	247	COMPAT_SYSCALL_DEFINE2(s390_setgroups16, int, gidsetsize, u16 __user *, grouplist)
1da177e4 LT	248	{
	249	struct group_info *group_info;
	250	int retval;
	251
7ff4d90b	252	if (!may_setgroups())
1da177e4 LT	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	retval = set_current_groups(group_info);
	267	put_group_info(group_info);
	268
	269	return retval;
	270	}
	271
e723e0cc	272	COMPAT_SYSCALL_DEFINE0(s390_getuid16)
1da177e4	273	{
558a4479	274	return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
1da177e4 LT	275	}
1da177e4 LT	276
e723e0cc	277	COMPAT_SYSCALL_DEFINE0(s390_geteuid16)
1da177e4	278	{
558a4479	279	return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
1da177e4 LT	280	}
1da177e4 LT	281
e723e0cc	282	COMPAT_SYSCALL_DEFINE0(s390_getgid16)
1da177e4	283	{
558a4479	284	return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
1da177e4 LT	285	}
1da177e4 LT	286
e723e0cc	287	COMPAT_SYSCALL_DEFINE0(s390_getegid16)
1da177e4	288	{
558a4479	289	return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
1da177e4 LT	290	}
1da177e4 LT	291
1df23957	292	#ifdef CONFIG_SYSVIPC
49382d93 HC	293	COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
49382d93 HC	294	compat_ulong_t, third, compat_uptr_t, ptr)
1da177e4 LT	295	{
	296	if (call >> 16) /* hack for backward compatibility */
	297	return -EINVAL;
56e41d3c	298	return compat_sys_ipc(call, first, second, third, ptr, third);
1da177e4	299	}
1df23957	300	#endif
1da177e4	301
e723e0cc	302	COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
1da177e4	303	{
e723e0cc	304	return sys_truncate(path, (unsigned long)high << 32 \| low);
1da177e4 LT	305	}
1da177e4 LT	306
52a0b536	307	COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
1da177e4	308	{
52a0b536	309	return sys_ftruncate(fd, (unsigned long)high << 32 \| low);
1da177e4 LT	310	}
1da177e4 LT	311
52a0b536 HC	312	COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
52a0b536 HC	313	compat_size_t, count, u32, high, u32, low)
1da177e4 LT	314	{
	315	if ((compat_ssize_t) count < 0)
	316	return -EINVAL;
52a0b536	317	return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 \| low);
1da177e4 LT	318	}
1da177e4 LT	319
52a0b536 HC	320	COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
52a0b536 HC	321	compat_size_t, count, u32, high, u32, low)
1da177e4 LT	322	{
	323	if ((compat_ssize_t) count < 0)
	324	return -EINVAL;
52a0b536	325	return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 \| low);
1da177e4 LT	326	}
1da177e4 LT	327
52a0b536	328	COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
1da177e4	329	{
52a0b536	330	return sys_readahead(fd, (unsigned long)high << 32 \| low, count);
1da177e4 LT	331	}
1da177e4 LT	332
1da177e4 LT	333	struct stat64_emu31 {
	334	unsigned long long st_dev;
	335	unsigned int __pad1;
	336	#define STAT64_HAS_BROKEN_ST_INO 1
	337	u32 __st_ino;
	338	unsigned int st_mode;
	339	unsigned int st_nlink;
	340	u32 st_uid;
	341	u32 st_gid;
	342	unsigned long long st_rdev;
	343	unsigned int __pad3;
	344	long st_size;
	345	u32 st_blksize;
	346	unsigned char __pad4[4];
	347	u32 __pad5; /* future possible st_blocks high bits */
	348	u32 st_blocks; /* Number 512-byte blocks allocated. */
	349	u32 st_atime;
	350	u32 __pad6;
	351	u32 st_mtime;
	352	u32 __pad7;
	353	u32 st_ctime;
	354	u32 __pad8; /* will be high 32 bits of ctime someday */
	355	unsigned long st_ino;
	356	};
	357
24954a14	358	static int cp_stat64(struct stat64_emu31 __user ubuf, struct kstat stat)
1da177e4 LT	359	{
	360	struct stat64_emu31 tmp;
	361
	362	memset(&tmp, 0, sizeof(tmp));
	363
	364	tmp.st_dev = huge_encode_dev(stat->dev);
	365	tmp.st_ino = stat->ino;
	366	tmp.__st_ino = (u32)stat->ino;
	367	tmp.st_mode = stat->mode;
	368	tmp.st_nlink = (unsigned int)stat->nlink;
a7c1938e EB	369	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
a7c1938e EB	370	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
1da177e4 LT	371	tmp.st_rdev = huge_encode_dev(stat->rdev);
	372	tmp.st_size = stat->size;
	373	tmp.st_blksize = (u32)stat->blksize;
	374	tmp.st_blocks = (u32)stat->blocks;
	375	tmp.st_atime = (u32)stat->atime.tv_sec;
	376	tmp.st_mtime = (u32)stat->mtime.tv_sec;
	377	tmp.st_ctime = (u32)stat->ctime.tv_sec;
	378
	379	return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	380	}
	381
52a0b536	382	COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user , filename, struct stat64_emu31 __user , statbuf)
1da177e4 LT	383	{
	384	struct kstat stat;
	385	int ret = vfs_stat(filename, &stat);
	386	if (!ret)
	387	ret = cp_stat64(statbuf, &stat);
	388	return ret;
	389	}
	390
a0f8c6da	391	COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user , filename, struct stat64_emu31 __user , statbuf)
1da177e4 LT	392	{
	393	struct kstat stat;
	394	int ret = vfs_lstat(filename, &stat);
	395	if (!ret)
	396	ret = cp_stat64(statbuf, &stat);
	397	return ret;
	398	}
	399
a0f8c6da	400	COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
1da177e4 LT	401	{
	402	struct kstat stat;
	403	int ret = vfs_fstat(fd, &stat);
	404	if (!ret)
	405	ret = cp_stat64(statbuf, &stat);
	406	return ret;
	407	}
	408
a0f8c6da HC	409	COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
a0f8c6da HC	410	struct stat64_emu31 __user *, statbuf, int, flag)
19bf9cbf HC	411	{
19bf9cbf HC	412	struct kstat stat;
0112fc22	413	int error;
19bf9cbf	414
0112fc22 OD	415	error = vfs_fstatat(dfd, filename, &stat, flag);
	416	if (error)
	417	return error;
	418	return cp_stat64(statbuf, &stat);
19bf9cbf HC	419	}
19bf9cbf HC	420
1da177e4 LT	421	/*
	422	* Linux/i386 didn't use to be able to handle more than
	423	* 4 system call parameters, so these system calls used a memory
	424	* block for parameter passing..
	425	*/
	426
	427	struct mmap_arg_struct_emu31 {
d3815898 HC	428	compat_ulong_t addr;
	429	compat_ulong_t len;
	430	compat_ulong_t prot;
	431	compat_ulong_t flags;
	432	compat_ulong_t fd;
	433	compat_ulong_t offset;
1da177e4 LT	434	};
1da177e4 LT	435
a0f8c6da	436	COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
1da177e4 LT	437	{
1da177e4 LT	438	struct mmap_arg_struct_emu31 a;
1da177e4 LT	439
1da177e4 LT	440	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	441	return -EFAULT;
1da177e4	442	if (a.offset & ~PAGE_MASK)
d3815898	443	return -EINVAL;
d3815898 HC	444	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
d3815898 HC	445	a.offset >> PAGE_SHIFT);
1da177e4 LT	446	}
1da177e4 LT	447
a0f8c6da	448	COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
1da177e4 LT	449	{
1da177e4 LT	450	struct mmap_arg_struct_emu31 a;
1da177e4 LT	451
1da177e4 LT	452	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	453	return -EFAULT;
d3815898	454	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
1da177e4 LT	455	}
1da177e4 LT	456
5383d2c8	457	COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
1da177e4 LT	458	{
	459	if ((compat_ssize_t) count < 0)
	460	return -EINVAL;
	461
	462	return sys_read(fd, buf, count);
	463	}
	464
5383d2c8	465	COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
1da177e4 LT	466	{
	467	if ((compat_ssize_t) count < 0)
	468	return -EINVAL;
	469
	470	return sys_write(fd, buf, count);
	471	}
	472
068e1b94 MS	473	/*
	474	* 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
	475	* These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
	476	* because the 31 bit values differ from the 64 bit values.
	477	*/
	478
5383d2c8	479	COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
068e1b94 MS	480	{
	481	if (advise == 4)
	482	advise = POSIX_FADV_DONTNEED;
	483	else if (advise == 5)
	484	advise = POSIX_FADV_NOREUSE;
5383d2c8	485	return sys_fadvise64(fd, (unsigned long)high << 32 \| low, len, advise);
068e1b94 MS	486	}
	487
	488	struct fadvise64_64_args {
	489	int fd;
	490	long long offset;
	491	long long len;
	492	int advice;
	493	};
	494
5383d2c8	495	COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
068e1b94 MS	496	{
	497	struct fadvise64_64_args a;
	498
	499	if ( copy_from_user(&a, args, sizeof(a)) )
	500	return -EFAULT;
	501	if (a.advice == 4)
	502	a.advice = POSIX_FADV_DONTNEED;
	503	else if (a.advice == 5)
	504	a.advice = POSIX_FADV_NOREUSE;
	505	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
	506	}
2c81fc4f HC	507
	508	COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
	509	u32, nhigh, u32, nlow, unsigned int, flags)
	510	{
	511	return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
	512	((u64)nhigh << 32) + nlow, flags);
	513	}
	514
	515	COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
	516	u32, lenhigh, u32, lenlow)
	517	{
	518	return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
	519	((u64)lenhigh << 32) + lenlow);
	520	}