arch/x86/ia32/sys_ia32.c

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