arch/x86/ia32/sys_ia32.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
   4  *             sys_sparc32
   5  *
   6  * Copyright (C) 2000           VA Linux Co
   7  * Copyright (C) 2000           Don Dugger <n0ano@valinux.com>
   8  * Copyright (C) 1999           Arun Sharma <arun.sharma@intel.com>
   9  * Copyright (C) 1997,1998      Jakub Jelinek (jj@sunsite.mff.cuni.cz)
  10  * Copyright (C) 1997           David S. Miller (davem@caip.rutgers.edu)
  11  * Copyright (C) 2000           Hewlett-Packard Co.
  12  * Copyright (C) 2000           David Mosberger-Tang <davidm@hpl.hp.com>
  13  * Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
  14  *
  15  * These routines maintain argument size conversion between 32bit and 64bit
  16  * environment. In 2.5 most of this should be moved to a generic directory.
  17  *
  18  * This file assumes that there is a hole at the end of user address space.
  19  *
  20  * Some of the functions are LE specific currently. These are
  21  * hopefully all marked.  This should be fixed.
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/sched.h>
  26 #include <linux/fs.h>
  27 #include <linux/file.h>
  28 #include <linux/signal.h>
  29 #include <linux/syscalls.h>
  30 #include <linux/times.h>
  31 #include <linux/utsname.h>
  32 #include <linux/mm.h>
  33 #include <linux/uio.h>
  34 #include <linux/poll.h>
  35 #include <linux/personality.h>
  36 #include <linux/stat.h>
  37 #include <linux/rwsem.h>
  38 #include <linux/compat.h>
  39 #include <linux/vfs.h>
  40 #include <linux/ptrace.h>
  41 #include <linux/highuid.h>
  42 #include <linux/sysctl.h>
  43 #include <linux/slab.h>
  44 #include <asm/mman.h>
  45 #include <asm/types.h>
  46 #include <linux/uaccess.h>
  47 #include <linux/atomic.h>
  48 #include <asm/vgtod.h>
  49 #include <asm/sys_ia32.h>
  50
  51 #define AA(__x)         ((unsigned long)(__x))
  52
  53
  54 asmlinkage long sys32_truncate64(const char __user *filename,
  55                                  unsigned long offset_low,
  56                                  unsigned long offset_high)
  57 {
  58        return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
  59 }
  60
  61 asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low,
  62                                   unsigned long offset_high)
  63 {
  64        return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
  65 }
  66
  67 /*
  68  * Another set for IA32/LFS -- x86_64 struct stat is different due to
  69  * support for 64bit inode numbers.
  70  */
  71 static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
  72 {
  73         typeof(ubuf->st_uid) uid = 0;
  74         typeof(ubuf->st_gid) gid = 0;
  75         SET_UID(uid, from_kuid_munged(current_user_ns(), stat->uid));
  76         SET_GID(gid, from_kgid_munged(current_user_ns(), stat->gid));
  77         if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
  78             __put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
  79             __put_user(stat->ino, &ubuf->__st_ino) ||
  80             __put_user(stat->ino, &ubuf->st_ino) ||
  81             __put_user(stat->mode, &ubuf->st_mode) ||
  82             __put_user(stat->nlink, &ubuf->st_nlink) ||
  83             __put_user(uid, &ubuf->st_uid) ||
  84             __put_user(gid, &ubuf->st_gid) ||
  85             __put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
  86             __put_user(stat->size, &ubuf->st_size) ||
  87             __put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
  88             __put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
  89             __put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
  90             __put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
  91             __put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
  92             __put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
  93             __put_user(stat->blksize, &ubuf->st_blksize) ||
  94             __put_user(stat->blocks, &ubuf->st_blocks))
  95                 return -EFAULT;
  96         return 0;
  97 }
  98
  99 asmlinkage long sys32_stat64(const char __user *filename,
 100                              struct stat64 __user *statbuf)
 101 {
 102         struct kstat stat;
 103         int ret = vfs_stat(filename, &stat);
 104
 105         if (!ret)
 106                 ret = cp_stat64(statbuf, &stat);
 107         return ret;
 108 }
 109
 110 asmlinkage long sys32_lstat64(const char __user *filename,
 111                               struct stat64 __user *statbuf)
 112 {
 113         struct kstat stat;
 114         int ret = vfs_lstat(filename, &stat);
 115         if (!ret)
 116                 ret = cp_stat64(statbuf, &stat);
 117         return ret;
 118 }
 119
 120 asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
 121 {
 122         struct kstat stat;
 123         int ret = vfs_fstat(fd, &stat);
 124         if (!ret)
 125                 ret = cp_stat64(statbuf, &stat);
 126         return ret;
 127 }
 128
 129 asmlinkage long sys32_fstatat(unsigned int dfd, const char __user *filename,
 130                               struct stat64 __user *statbuf, int flag)
 131 {
 132         struct kstat stat;
 133         int error;
 134
 135         error = vfs_fstatat(dfd, filename, &stat, flag);
 136         if (error)
 137                 return error;
 138         return cp_stat64(statbuf, &stat);
 139 }
 140
 141 /*
 142  * Linux/i386 didn't use to be able to handle more than
 143  * 4 system call parameters, so these system calls used a memory
 144  * block for parameter passing..
 145  */
 146
 147 struct mmap_arg_struct32 {
 148         unsigned int addr;
 149         unsigned int len;
 150         unsigned int prot;
 151         unsigned int flags;
 152         unsigned int fd;
 153         unsigned int offset;
 154 };
 155
 156 asmlinkage long sys32_mmap(struct mmap_arg_struct32 __user *arg)
 157 {
 158         struct mmap_arg_struct32 a;
 159
 160         if (copy_from_user(&a, arg, sizeof(a)))
 161                 return -EFAULT;
 162
 163         if (a.offset & ~PAGE_MASK)
 164                 return -EINVAL;
 165
 166         return sys_mmap_pgoff(a.addr, a.len, a.prot, a.flags, a.fd,
 167                                a.offset>>PAGE_SHIFT);
 168 }
 169
 170 asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int __user *stat_addr,
 171                               int options)
 172 {
 173         return compat_sys_wait4(pid, stat_addr, options, NULL);
 174 }
 175
 176 /* warning: next two assume little endian */
 177 asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count,
 178                             u32 poslo, u32 poshi)
 179 {
 180         return sys_pread64(fd, ubuf, count,
 181                          ((loff_t)AA(poshi) << 32) | AA(poslo));
 182 }
 183
 184 asmlinkage long sys32_pwrite(unsigned int fd, const char __user *ubuf,
 185                              u32 count, u32 poslo, u32 poshi)
 186 {
 187         return sys_pwrite64(fd, ubuf, count,
 188                           ((loff_t)AA(poshi) << 32) | AA(poslo));
 189 }
 190
 191
 192 /*
 193  * Some system calls that need sign extended arguments. This could be
 194  * done by a generic wrapper.
 195  */
 196 long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
 197                         __u32 len_low, __u32 len_high, int advice)
 198 {
 199         return sys_fadvise64_64(fd,
 200                                (((u64)offset_high)<<32) | offset_low,
 201                                (((u64)len_high)<<32) | len_low,
 202                                 advice);
 203 }
 204
 205 asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
 206                                    size_t count)
 207 {
 208         return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
 209 }
 210
 211 asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
 212                                       unsigned n_low, unsigned n_hi,  int flags)
 213 {
 214         return sys_sync_file_range(fd,
 215                                    ((u64)off_hi << 32) | off_low,
 216                                    ((u64)n_hi << 32) | n_low, flags);
 217 }
 218
 219 asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi,
 220                                 size_t len, int advice)
 221 {
 222         return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
 223                                 len, advice);
 224 }
 225
 226 asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
 227                                 unsigned offset_hi, unsigned len_lo,
 228                                 unsigned len_hi)
 229 {
 230         return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
 231                              ((u64)len_hi << 32) | len_lo);
 232 }