// 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/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" #ifdef CONFIG_SYSVIPCCOMPAT_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_ksys_ipc(call, first, second, third, ptr, third);}#endif COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low){	return ksys_truncate(path, (unsigned long)high << 32 | low);} COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low){	return ksys_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 ksys_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 ksys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);} COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count){	return ksys_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 ksys_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 ksys_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 ksys_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 ksys_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 ksys_fadvise64_64(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 ksys_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 ksys_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 ksys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,			      ((u64)lenhigh << 32) + lenlow);}