arch/s390/kernel/compat_linux.c

   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
  61 COMPAT_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
  70 COMPAT_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
  75 COMPAT_SYSCALL_DEFINE3(s390_ftruncate64, unsigned int, fd, u32, high, u32, low)
  76 {
  77         return ksys_ftruncate(fd, (unsigned long)high << 32 | low);
  78 }
  79
  80 COMPAT_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
  88 COMPAT_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
  96 COMPAT_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
 101 struct 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
 126 static 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
 150 COMPAT_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
 159 COMPAT_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
 168 COMPAT_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
 177 COMPAT_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
 195 struct 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
 204 COMPAT_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
 216 COMPAT_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
 225 COMPAT_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
 233 COMPAT_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
 247 COMPAT_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
 257 struct fadvise64_64_args {
 258         int fd;
 259         long long offset;
 260         long long len;
 261         int advice;
 262 };
 263
 264 COMPAT_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
 277 COMPAT_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
 284 COMPAT_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 }