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

// SPDX-License-Identifier: GPL-2.0
/*
 *  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;
	}

	groups_sort(group_info);
	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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
1da177e4	3	* S390 version
a53c8fab	4	* Copyright IBM Corp. 2000
1da177e4 LT	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
1da177e4 LT	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>
1da177e4	26	#include <linux/smp.h>
1da177e4 LT	27	#include <linux/sem.h>
	28	#include <linux/msg.h>
	29	#include <linux/shm.h>
1da177e4	30	#include <linux/uio.h>
1da177e4	31	#include <linux/quota.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
bdcf0a42	266	groups_sort(group_info);
1da177e4 LT	267	retval = set_current_groups(group_info);
	268	put_group_info(group_info);
	269
	270	return retval;
	271	}
	272
e723e0cc	273	COMPAT_SYSCALL_DEFINE0(s390_getuid16)
1da177e4	274	{
558a4479	275	return high2lowuid(from_kuid_munged(current_user_ns(), current_uid()));
1da177e4 LT	276	}
1da177e4 LT	277
e723e0cc	278	COMPAT_SYSCALL_DEFINE0(s390_geteuid16)
1da177e4	279	{
558a4479	280	return high2lowuid(from_kuid_munged(current_user_ns(), current_euid()));
1da177e4 LT	281	}
1da177e4 LT	282
e723e0cc	283	COMPAT_SYSCALL_DEFINE0(s390_getgid16)
1da177e4	284	{
558a4479	285	return high2lowgid(from_kgid_munged(current_user_ns(), current_gid()));
1da177e4 LT	286	}
1da177e4 LT	287
e723e0cc	288	COMPAT_SYSCALL_DEFINE0(s390_getegid16)
1da177e4	289	{
558a4479	290	return high2lowgid(from_kgid_munged(current_user_ns(), current_egid()));
1da177e4 LT	291	}
1da177e4 LT	292
1df23957	293	#ifdef CONFIG_SYSVIPC
49382d93 HC	294	COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
49382d93 HC	295	compat_ulong_t, third, compat_uptr_t, ptr)
1da177e4 LT	296	{
	297	if (call >> 16) /* hack for backward compatibility */
	298	return -EINVAL;
56e41d3c	299	return compat_sys_ipc(call, first, second, third, ptr, third);
1da177e4	300	}
1df23957	301	#endif
1da177e4	302
e723e0cc	303	COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
1da177e4	304	{
e723e0cc	305	return sys_truncate(path, (unsigned long)high << 32 \| low);
1da177e4 LT	306	}
1da177e4 LT	307
52a0b536	308	COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
1da177e4	309	{
52a0b536	310	return sys_ftruncate(fd, (unsigned long)high << 32 \| low);
1da177e4 LT	311	}
1da177e4 LT	312
52a0b536 HC	313	COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
52a0b536 HC	314	compat_size_t, count, u32, high, u32, low)
1da177e4 LT	315	{
	316	if ((compat_ssize_t) count < 0)
	317	return -EINVAL;
52a0b536	318	return sys_pread64(fd, ubuf, count, (unsigned long)high << 32 \| low);
1da177e4 LT	319	}
1da177e4 LT	320
52a0b536 HC	321	COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
52a0b536 HC	322	compat_size_t, count, u32, high, u32, low)
1da177e4 LT	323	{
	324	if ((compat_ssize_t) count < 0)
	325	return -EINVAL;
52a0b536	326	return sys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 \| low);
1da177e4 LT	327	}
1da177e4 LT	328
52a0b536	329	COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
1da177e4	330	{
52a0b536	331	return sys_readahead(fd, (unsigned long)high << 32 \| low, count);
1da177e4 LT	332	}
1da177e4 LT	333
1da177e4 LT	334	struct 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
24954a14	359	static int cp_stat64(struct stat64_emu31 __user ubuf, struct kstat stat)
1da177e4 LT	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;
a7c1938e EB	370	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
a7c1938e EB	371	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
1da177e4 LT	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
52a0b536	383	COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user , filename, struct stat64_emu31 __user , statbuf)
1da177e4 LT	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
a0f8c6da	392	COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user , filename, struct stat64_emu31 __user , statbuf)
1da177e4 LT	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
a0f8c6da	401	COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
1da177e4 LT	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
a0f8c6da HC	410	COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
a0f8c6da HC	411	struct stat64_emu31 __user *, statbuf, int, flag)
19bf9cbf HC	412	{
19bf9cbf HC	413	struct kstat stat;
0112fc22	414	int error;
19bf9cbf	415
0112fc22 OD	416	error = vfs_fstatat(dfd, filename, &stat, flag);
	417	if (error)
	418	return error;
	419	return cp_stat64(statbuf, &stat);
19bf9cbf HC	420	}
19bf9cbf HC	421
1da177e4 LT	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
	428	struct mmap_arg_struct_emu31 {
d3815898 HC	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;
1da177e4 LT	435	};
1da177e4 LT	436
a0f8c6da	437	COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
1da177e4 LT	438	{
1da177e4 LT	439	struct mmap_arg_struct_emu31 a;
1da177e4 LT	440
1da177e4 LT	441	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	442	return -EFAULT;
1da177e4	443	if (a.offset & ~PAGE_MASK)
d3815898	444	return -EINVAL;
d3815898 HC	445	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
d3815898 HC	446	a.offset >> PAGE_SHIFT);
1da177e4 LT	447	}
1da177e4 LT	448
a0f8c6da	449	COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
1da177e4 LT	450	{
1da177e4 LT	451	struct mmap_arg_struct_emu31 a;
1da177e4 LT	452
1da177e4 LT	453	if (copy_from_user(&a, arg, sizeof(a)))
d3815898	454	return -EFAULT;
d3815898	455	return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
1da177e4 LT	456	}
1da177e4 LT	457
5383d2c8	458	COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
1da177e4 LT	459	{
	460	if ((compat_ssize_t) count < 0)
	461	return -EINVAL;
	462
	463	return sys_read(fd, buf, count);
	464	}
	465
5383d2c8	466	COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
1da177e4 LT	467	{
	468	if ((compat_ssize_t) count < 0)
	469	return -EINVAL;
	470
	471	return sys_write(fd, buf, count);
	472	}
	473
068e1b94 MS	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
5383d2c8	480	COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
068e1b94 MS	481	{
	482	if (advise == 4)
	483	advise = POSIX_FADV_DONTNEED;
	484	else if (advise == 5)
	485	advise = POSIX_FADV_NOREUSE;
5383d2c8	486	return sys_fadvise64(fd, (unsigned long)high << 32 \| low, len, advise);
068e1b94 MS	487	}
	488
	489	struct fadvise64_64_args {
	490	int fd;
	491	long long offset;
	492	long long len;
	493	int advice;
	494	};
	495
5383d2c8	496	COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
068e1b94 MS	497	{
	498	struct fadvise64_64_args a;
	499
	500	if ( copy_from_user(&a, args, sizeof(a)) )
	501	return -EFAULT;
	502	if (a.advice == 4)
	503	a.advice = POSIX_FADV_DONTNEED;
	504	else if (a.advice == 5)
	505	a.advice = POSIX_FADV_NOREUSE;
	506	return sys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
	507	}
2c81fc4f HC	508
	509	COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
	510	u32, nhigh, u32, nlow, unsigned int, flags)
	511	{
	512	return sys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
	513	((u64)nhigh << 32) + nlow, flags);
	514	}
	515
	516	COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
	517	u32, lenhigh, u32, lenlow)
	518	{
	519	return sys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
	520	((u64)lenhigh << 32) + lenlow);
	521	}