linux/arch/s390/kernel/compat_linux.c
<<
>>
Prefs
   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 *  S390 version
   4 *    Copyright IBM Corp. 2000
   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
  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>
  26#include <linux/smp.h>
  27#include <linux/sem.h>
  28#include <linux/msg.h>
  29#include <linux/shm.h>
  30#include <linux/uio.h>
  31#include <linux/quota.h>
  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/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>
  44#include <linux/capability.h>
  45#include <linux/compat.h>
  46#include <linux/vfs.h>
  47#include <linux/ptrace.h>
  48#include <linux/fadvise.h>
  49#include <linux/ipc.h>
  50#include <linux/slab.h>
  51
  52#include <asm/types.h>
  53#include <linux/uaccess.h>
  54
  55#include <net/scm.h>
  56#include <net/sock.h>
  57
  58#include "compat_linux.h"
  59
  60#ifdef CONFIG_SYSVIPC
  61COMPAT_SYSCALL_DEFINE5(s390_ipc, uint, call, int, first, compat_ulong_t, second,
  62                compat_ulong_t, third, compat_uptr_t, ptr)
  63{
  64        if (call >> 16)         /* hack for backward compatibility */
  65                return -EINVAL;
  66        return compat_ksys_ipc(call, first, second, third, ptr, third);
  67}
  68#endif
  69
  70COMPAT_SYSCALL_DEFINE3(s390_truncate64, const char __user *, path, u32, high, u32, low)
  71{
  72        return ksys_truncate(path, (unsigned long)high << 32 | low);
  73}
  74
  75COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
  76{
  77        return ksys_ftruncate(fd, (unsigned long)high << 32 | low);
  78}
  79
  80COMPAT_SYSCALL_DEFINE5(s390_pread64, unsigned int, fd, char __user *, ubuf,
  81                       compat_size_t, count, u32, high, u32, low)
  82{
  83        if ((compat_ssize_t) count < 0)
  84                return -EINVAL;
  85        return ksys_pread64(fd, ubuf, count, (unsigned long)high << 32 | low);
  86}
  87
  88COMPAT_SYSCALL_DEFINE5(s390_pwrite64, unsigned int, fd, const char __user *, ubuf,
  89                       compat_size_t, count, u32, high, u32, low)
  90{
  91        if ((compat_ssize_t) count < 0)
  92                return -EINVAL;
  93        return ksys_pwrite64(fd, ubuf, count, (unsigned long)high << 32 | low);
  94}
  95
  96COMPAT_SYSCALL_DEFINE4(s390_readahead, int, fd, u32, high, u32, low, s32, count)
  97{
  98        return ksys_readahead(fd, (unsigned long)high << 32 | low, count);
  99}
 100
 101struct stat64_emu31 {
 102        unsigned long long  st_dev;
 103        unsigned int    __pad1;
 104#define STAT64_HAS_BROKEN_ST_INO        1
 105        u32             __st_ino;
 106        unsigned int    st_mode;
 107        unsigned int    st_nlink;
 108        u32             st_uid;
 109        u32             st_gid;
 110        unsigned long long  st_rdev;
 111        unsigned int    __pad3;
 112        long            st_size;
 113        u32             st_blksize;
 114        unsigned char   __pad4[4];
 115        u32             __pad5;     /* future possible st_blocks high bits */
 116        u32             st_blocks;  /* Number 512-byte blocks allocated. */
 117        u32             st_atime;
 118        u32             __pad6;
 119        u32             st_mtime;
 120        u32             __pad7;
 121        u32             st_ctime;
 122        u32             __pad8;     /* will be high 32 bits of ctime someday */
 123        unsigned long   st_ino;
 124};      
 125
 126static int cp_stat64(struct stat64_emu31 __user *ubuf, struct kstat *stat)
 127{
 128        struct stat64_emu31 tmp;
 129
 130        memset(&tmp, 0, sizeof(tmp));
 131
 132        tmp.st_dev = huge_encode_dev(stat->dev);
 133        tmp.st_ino = stat->ino;
 134        tmp.__st_ino = (u32)stat->ino;
 135        tmp.st_mode = stat->mode;
 136        tmp.st_nlink = (unsigned int)stat->nlink;
 137        tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
 138        tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
 139        tmp.st_rdev = huge_encode_dev(stat->rdev);
 140        tmp.st_size = stat->size;
 141        tmp.st_blksize = (u32)stat->blksize;
 142        tmp.st_blocks = (u32)stat->blocks;
 143        tmp.st_atime = (u32)stat->atime.tv_sec;
 144        tmp.st_mtime = (u32)stat->mtime.tv_sec;
 145        tmp.st_ctime = (u32)stat->ctime.tv_sec;
 146
 147        return copy_to_user(ubuf,&tmp,sizeof(tmp)) ? -EFAULT : 0; 
 148}
 149
 150COMPAT_SYSCALL_DEFINE2(s390_stat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
 151{
 152        struct kstat stat;
 153        int ret = vfs_stat(filename, &stat);
 154        if (!ret)
 155                ret = cp_stat64(statbuf, &stat);
 156        return ret;
 157}
 158
 159COMPAT_SYSCALL_DEFINE2(s390_lstat64, const char __user *, filename, struct stat64_emu31 __user *, statbuf)
 160{
 161        struct kstat stat;
 162        int ret = vfs_lstat(filename, &stat);
 163        if (!ret)
 164                ret = cp_stat64(statbuf, &stat);
 165        return ret;
 166}
 167
 168COMPAT_SYSCALL_DEFINE2(s390_fstat64, unsigned int, fd, struct stat64_emu31 __user *, statbuf)
 169{
 170        struct kstat stat;
 171        int ret = vfs_fstat(fd, &stat);
 172        if (!ret)
 173                ret = cp_stat64(statbuf, &stat);
 174        return ret;
 175}
 176
 177COMPAT_SYSCALL_DEFINE4(s390_fstatat64, unsigned int, dfd, const char __user *, filename,
 178                       struct stat64_emu31 __user *, statbuf, int, flag)
 179{
 180        struct kstat stat;
 181        int error;
 182
 183        error = vfs_fstatat(dfd, filename, &stat, flag);
 184        if (error)
 185                return error;
 186        return cp_stat64(statbuf, &stat);
 187}
 188
 189/*
 190 * Linux/i386 didn't use to be able to handle more than
 191 * 4 system call parameters, so these system calls used a memory
 192 * block for parameter passing..
 193 */
 194
 195struct mmap_arg_struct_emu31 {
 196        compat_ulong_t addr;
 197        compat_ulong_t len;
 198        compat_ulong_t prot;
 199        compat_ulong_t flags;
 200        compat_ulong_t fd;
 201        compat_ulong_t offset;
 202};
 203
 204COMPAT_SYSCALL_DEFINE1(s390_old_mmap, struct mmap_arg_struct_emu31 __user *, arg)
 205{
 206        struct mmap_arg_struct_emu31 a;
 207
 208        if (copy_from_user(&a, arg, sizeof(a)))
 209                return -EFAULT;
 210        if (a.offset & ~PAGE_MASK)
 211                return -EINVAL;
 212        return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
 213                               a.offset >> PAGE_SHIFT);
 214}
 215
 216COMPAT_SYSCALL_DEFINE1(s390_mmap2, struct mmap_arg_struct_emu31 __user *, arg)
 217{
 218        struct mmap_arg_struct_emu31 a;
 219
 220        if (copy_from_user(&a, arg, sizeof(a)))
 221                return -EFAULT;
 222        return ksys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd, a.offset);
 223}
 224
 225COMPAT_SYSCALL_DEFINE3(s390_read, unsigned int, fd, char __user *, buf, compat_size_t, count)
 226{
 227        if ((compat_ssize_t) count < 0)
 228                return -EINVAL; 
 229
 230        return ksys_read(fd, buf, count);
 231}
 232
 233COMPAT_SYSCALL_DEFINE3(s390_write, unsigned int, fd, const char __user *, buf, compat_size_t, count)
 234{
 235        if ((compat_ssize_t) count < 0)
 236                return -EINVAL; 
 237
 238        return ksys_write(fd, buf, count);
 239}
 240
 241/*
 242 * 31 bit emulation wrapper functions for sys_fadvise64/fadvise64_64.
 243 * These need to rewrite the advise values for POSIX_FADV_{DONTNEED,NOREUSE}
 244 * because the 31 bit values differ from the 64 bit values.
 245 */
 246
 247COMPAT_SYSCALL_DEFINE5(s390_fadvise64, int, fd, u32, high, u32, low, compat_size_t, len, int, advise)
 248{
 249        if (advise == 4)
 250                advise = POSIX_FADV_DONTNEED;
 251        else if (advise == 5)
 252                advise = POSIX_FADV_NOREUSE;
 253        return ksys_fadvise64_64(fd, (unsigned long)high << 32 | low, len,
 254                                 advise);
 255}
 256
 257struct fadvise64_64_args {
 258        int fd;
 259        long long offset;
 260        long long len;
 261        int advice;
 262};
 263
 264COMPAT_SYSCALL_DEFINE1(s390_fadvise64_64, struct fadvise64_64_args __user *, args)
 265{
 266        struct fadvise64_64_args a;
 267
 268        if ( copy_from_user(&a, args, sizeof(a)) )
 269                return -EFAULT;
 270        if (a.advice == 4)
 271                a.advice = POSIX_FADV_DONTNEED;
 272        else if (a.advice == 5)
 273                a.advice = POSIX_FADV_NOREUSE;
 274        return ksys_fadvise64_64(a.fd, a.offset, a.len, a.advice);
 275}
 276
 277COMPAT_SYSCALL_DEFINE6(s390_sync_file_range, int, fd, u32, offhigh, u32, offlow,
 278                       u32, nhigh, u32, nlow, unsigned int, flags)
 279{
 280        return ksys_sync_file_range(fd, ((loff_t)offhigh << 32) + offlow,
 281                                   ((u64)nhigh << 32) + nlow, flags);
 282}
 283
 284COMPAT_SYSCALL_DEFINE6(s390_fallocate, int, fd, int, mode, u32, offhigh, u32, offlow,
 285                       u32, lenhigh, u32, lenlow)
 286{
 287        return ksys_fallocate(fd, mode, ((loff_t)offhigh << 32) + offlow,
 288                              ((u64)lenhigh << 32) + lenlow);
 289}
 290
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.