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OpenCloudOS-Kernel/arch/x86/ia32/sys_ia32.c

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/*
* sys_ia32.c: Conversion between 32bit and 64bit native syscalls. Based on
* sys_sparc32
*
* Copyright (C) 2000 VA Linux Co
* Copyright (C) 2000 Don Dugger <n0ano@valinux.com>
* Copyright (C) 1999 Arun Sharma <arun.sharma@intel.com>
* Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
* Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
* Copyright (C) 2000 Hewlett-Packard Co.
* Copyright (C) 2000 David Mosberger-Tang <davidm@hpl.hp.com>
* Copyright (C) 2000,2001,2002 Andi Kleen, SuSE Labs (x86-64 port)
*
* These routines maintain argument size conversion between 32bit and 64bit
* environment. In 2.5 most of this should be moved to a generic directory.
*
* This file assumes that there is a hole at the end of user address space.
*
* Some of the functions are LE specific currently. These are
* hopefully all marked. This should be fixed.
*/
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/signal.h>
#include <linux/syscalls.h>
#include <linux/times.h>
#include <linux/utsname.h>
#include <linux/smp_lock.h>
#include <linux/mm.h>
#include <linux/uio.h>
#include <linux/poll.h>
#include <linux/personality.h>
#include <linux/stat.h>
#include <linux/rwsem.h>
#include <linux/compat.h>
#include <linux/vfs.h>
#include <linux/ptrace.h>
#include <linux/highuid.h>
#include <linux/sysctl.h>
#include <asm/mman.h>
#include <asm/types.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include <asm/ia32.h>
#include <asm/vgtod.h>
#define AA(__x) ((unsigned long)(__x))
int cp_compat_stat(struct kstat *kbuf, struct compat_stat __user *ubuf)
{
compat_ino_t ino;
typeof(ubuf->st_uid) uid = 0;
typeof(ubuf->st_gid) gid = 0;
SET_UID(uid, kbuf->uid);
SET_GID(gid, kbuf->gid);
if (!old_valid_dev(kbuf->dev) || !old_valid_dev(kbuf->rdev))
return -EOVERFLOW;
if (kbuf->size >= 0x7fffffff)
return -EOVERFLOW;
ino = kbuf->ino;
if (sizeof(ino) < sizeof(kbuf->ino) && ino != kbuf->ino)
return -EOVERFLOW;
if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct compat_stat)) ||
__put_user(old_encode_dev(kbuf->dev), &ubuf->st_dev) ||
__put_user(ino, &ubuf->st_ino) ||
__put_user(kbuf->mode, &ubuf->st_mode) ||
__put_user(kbuf->nlink, &ubuf->st_nlink) ||
__put_user(uid, &ubuf->st_uid) ||
__put_user(gid, &ubuf->st_gid) ||
__put_user(old_encode_dev(kbuf->rdev), &ubuf->st_rdev) ||
__put_user(kbuf->size, &ubuf->st_size) ||
__put_user(kbuf->atime.tv_sec, &ubuf->st_atime) ||
__put_user(kbuf->atime.tv_nsec, &ubuf->st_atime_nsec) ||
__put_user(kbuf->mtime.tv_sec, &ubuf->st_mtime) ||
__put_user(kbuf->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
__put_user(kbuf->ctime.tv_sec, &ubuf->st_ctime) ||
__put_user(kbuf->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
__put_user(kbuf->blksize, &ubuf->st_blksize) ||
__put_user(kbuf->blocks, &ubuf->st_blocks))
return -EFAULT;
return 0;
}
asmlinkage long sys32_truncate64(char __user *filename,
unsigned long offset_low,
unsigned long offset_high)
{
return sys_truncate(filename, ((loff_t) offset_high << 32) | offset_low);
}
asmlinkage long sys32_ftruncate64(unsigned int fd, unsigned long offset_low,
unsigned long offset_high)
{
return sys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
}
/*
* Another set for IA32/LFS -- x86_64 struct stat is different due to
* support for 64bit inode numbers.
*/
static int cp_stat64(struct stat64 __user *ubuf, struct kstat *stat)
{
typeof(ubuf->st_uid) uid = 0;
typeof(ubuf->st_gid) gid = 0;
SET_UID(uid, stat->uid);
SET_GID(gid, stat->gid);
if (!access_ok(VERIFY_WRITE, ubuf, sizeof(struct stat64)) ||
__put_user(huge_encode_dev(stat->dev), &ubuf->st_dev) ||
__put_user(stat->ino, &ubuf->__st_ino) ||
__put_user(stat->ino, &ubuf->st_ino) ||
__put_user(stat->mode, &ubuf->st_mode) ||
__put_user(stat->nlink, &ubuf->st_nlink) ||
__put_user(uid, &ubuf->st_uid) ||
__put_user(gid, &ubuf->st_gid) ||
__put_user(huge_encode_dev(stat->rdev), &ubuf->st_rdev) ||
__put_user(stat->size, &ubuf->st_size) ||
__put_user(stat->atime.tv_sec, &ubuf->st_atime) ||
__put_user(stat->atime.tv_nsec, &ubuf->st_atime_nsec) ||
__put_user(stat->mtime.tv_sec, &ubuf->st_mtime) ||
__put_user(stat->mtime.tv_nsec, &ubuf->st_mtime_nsec) ||
__put_user(stat->ctime.tv_sec, &ubuf->st_ctime) ||
__put_user(stat->ctime.tv_nsec, &ubuf->st_ctime_nsec) ||
__put_user(stat->blksize, &ubuf->st_blksize) ||
__put_user(stat->blocks, &ubuf->st_blocks))
return -EFAULT;
return 0;
}
asmlinkage long sys32_stat64(char __user *filename,
struct stat64 __user *statbuf)
{
struct kstat stat;
int ret = vfs_stat(filename, &stat);
if (!ret)
ret = cp_stat64(statbuf, &stat);
return ret;
}
asmlinkage long sys32_lstat64(char __user *filename,
struct stat64 __user *statbuf)
{
struct kstat stat;
int ret = vfs_lstat(filename, &stat);
if (!ret)
ret = cp_stat64(statbuf, &stat);
return ret;
}
asmlinkage long sys32_fstat64(unsigned int fd, struct stat64 __user *statbuf)
{
struct kstat stat;
int ret = vfs_fstat(fd, &stat);
if (!ret)
ret = cp_stat64(statbuf, &stat);
return ret;
}
asmlinkage long sys32_fstatat(unsigned int dfd, char __user *filename,
struct stat64 __user *statbuf, int flag)
{
struct kstat stat;
int error = -EINVAL;
if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
goto out;
if (flag & AT_SYMLINK_NOFOLLOW)
error = vfs_lstat_fd(dfd, filename, &stat);
else
error = vfs_stat_fd(dfd, filename, &stat);
if (!error)
error = cp_stat64(statbuf, &stat);
out:
return error;
}
/*
* 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 {
unsigned int addr;
unsigned int len;
unsigned int prot;
unsigned int flags;
unsigned int fd;
unsigned int offset;
};
asmlinkage long sys32_mmap(struct mmap_arg_struct __user *arg)
{
struct mmap_arg_struct a;
struct file *file = NULL;
unsigned long retval;
struct mm_struct *mm ;
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
if (a.offset & ~PAGE_MASK)
return -EINVAL;
if (!(a.flags & MAP_ANONYMOUS)) {
file = fget(a.fd);
if (!file)
return -EBADF;
}
mm = current->mm;
down_write(&mm->mmap_sem);
retval = do_mmap_pgoff(file, a.addr, a.len, a.prot, a.flags,
a.offset>>PAGE_SHIFT);
if (file)
fput(file);
up_write(&mm->mmap_sem);
return retval;
}
asmlinkage long sys32_mprotect(unsigned long start, size_t len,
unsigned long prot)
{
return sys_mprotect(start, len, prot);
}
asmlinkage long sys32_pipe(int __user *fd)
{
int retval;
int fds[2];
retval = do_pipe(fds);
if (retval)
goto out;
if (copy_to_user(fd, fds, sizeof(fds)))
retval = -EFAULT;
out:
return retval;
}
asmlinkage long sys32_rt_sigaction(int sig, struct sigaction32 __user *act,
struct sigaction32 __user *oact,
unsigned int sigsetsize)
{
struct k_sigaction new_ka, old_ka;
int ret;
compat_sigset_t set32;
/* XXX: Don't preclude handling different sized sigset_t's. */
if (sigsetsize != sizeof(compat_sigset_t))
return -EINVAL;
if (act) {
compat_uptr_t handler, restorer;
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
__get_user(handler, &act->sa_handler) ||
__get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
__get_user(restorer, &act->sa_restorer) ||
__copy_from_user(&set32, &act->sa_mask,
sizeof(compat_sigset_t)))
return -EFAULT;
new_ka.sa.sa_handler = compat_ptr(handler);
new_ka.sa.sa_restorer = compat_ptr(restorer);
/*
* FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
* than _NSIG_WORDS << 1
*/
switch (_NSIG_WORDS) {
case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
| (((long)set32.sig[7]) << 32);
case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
| (((long)set32.sig[5]) << 32);
case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
| (((long)set32.sig[3]) << 32);
case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
| (((long)set32.sig[1]) << 32);
}
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
/*
* FIXME: here we rely on _COMPAT_NSIG_WORS to be >=
* than _NSIG_WORDS << 1
*/
switch (_NSIG_WORDS) {
case 4:
set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
set32.sig[6] = old_ka.sa.sa_mask.sig[3];
case 3:
set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
set32.sig[4] = old_ka.sa.sa_mask.sig[2];
case 2:
set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
set32.sig[2] = old_ka.sa.sa_mask.sig[1];
case 1:
set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
set32.sig[0] = old_ka.sa.sa_mask.sig[0];
}
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
__put_user(ptr_to_compat(old_ka.sa.sa_handler),
&oact->sa_handler) ||
__put_user(ptr_to_compat(old_ka.sa.sa_restorer),
&oact->sa_restorer) ||
__put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
__copy_to_user(&oact->sa_mask, &set32,
sizeof(compat_sigset_t)))
return -EFAULT;
}
return ret;
}
asmlinkage long sys32_sigaction(int sig, struct old_sigaction32 __user *act,
struct old_sigaction32 __user *oact)
{
struct k_sigaction new_ka, old_ka;
int ret;
if (act) {
compat_old_sigset_t mask;
compat_uptr_t handler, restorer;
if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
__get_user(handler, &act->sa_handler) ||
__get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
__get_user(restorer, &act->sa_restorer) ||
__get_user(mask, &act->sa_mask))
return -EFAULT;
new_ka.sa.sa_handler = compat_ptr(handler);
new_ka.sa.sa_restorer = compat_ptr(restorer);
siginitset(&new_ka.sa.sa_mask, mask);
}
ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
if (!ret && oact) {
if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
__put_user(ptr_to_compat(old_ka.sa.sa_handler),
&oact->sa_handler) ||
__put_user(ptr_to_compat(old_ka.sa.sa_restorer),
&oact->sa_restorer) ||
__put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
__put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
return -EFAULT;
}
return ret;
}
asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
compat_sigset_t __user *oset,
unsigned int sigsetsize)
{
sigset_t s;
compat_sigset_t s32;
int ret;
mm_segment_t old_fs = get_fs();
if (set) {
if (copy_from_user(&s32, set, sizeof(compat_sigset_t)))
return -EFAULT;
switch (_NSIG_WORDS) {
case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
}
}
set_fs(KERNEL_DS);
ret = sys_rt_sigprocmask(how,
set ? (sigset_t __user *)&s : NULL,
oset ? (sigset_t __user *)&s : NULL,
sigsetsize);
set_fs(old_fs);
if (ret)
return ret;
if (oset) {
switch (_NSIG_WORDS) {
case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
}
if (copy_to_user(oset, &s32, sizeof(compat_sigset_t)))
return -EFAULT;
}
return 0;
}
static inline long get_tv32(struct timeval *o, struct compat_timeval __user *i)
{
int err = -EFAULT;
if (access_ok(VERIFY_READ, i, sizeof(*i))) {
err = __get_user(o->tv_sec, &i->tv_sec);
err |= __get_user(o->tv_usec, &i->tv_usec);
}
return err;
}
static inline long put_tv32(struct compat_timeval __user *o, struct timeval *i)
{
int err = -EFAULT;
if (access_ok(VERIFY_WRITE, o, sizeof(*o))) {
err = __put_user(i->tv_sec, &o->tv_sec);
err |= __put_user(i->tv_usec, &o->tv_usec);
}
return err;
}
asmlinkage long sys32_alarm(unsigned int seconds)
{
return alarm_setitimer(seconds);
}
/*
* Translations due to time_t size differences. Which affects all
* sorts of things, like timeval and itimerval.
*/
asmlinkage long sys32_gettimeofday(struct compat_timeval __user *tv,
struct timezone __user *tz)
{
if (tv) {
struct timeval ktv;
do_gettimeofday(&ktv);
if (put_tv32(tv, &ktv))
return -EFAULT;
}
if (tz) {
if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
return -EFAULT;
}
return 0;
}
asmlinkage long sys32_settimeofday(struct compat_timeval __user *tv,
struct timezone __user *tz)
{
struct timeval ktv;
struct timespec kts;
struct timezone ktz;
if (tv) {
if (get_tv32(&ktv, tv))
return -EFAULT;
kts.tv_sec = ktv.tv_sec;
kts.tv_nsec = ktv.tv_usec * NSEC_PER_USEC;
}
if (tz) {
if (copy_from_user(&ktz, tz, sizeof(ktz)))
return -EFAULT;
}
return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}
struct sel_arg_struct {
unsigned int n;
unsigned int inp;
unsigned int outp;
unsigned int exp;
unsigned int tvp;
};
asmlinkage long sys32_old_select(struct sel_arg_struct __user *arg)
{
struct sel_arg_struct a;
if (copy_from_user(&a, arg, sizeof(a)))
return -EFAULT;
return compat_sys_select(a.n, compat_ptr(a.inp), compat_ptr(a.outp),
compat_ptr(a.exp), compat_ptr(a.tvp));
}
asmlinkage long sys32_waitpid(compat_pid_t pid, unsigned int *stat_addr,
int options)
{
return compat_sys_wait4(pid, stat_addr, options, NULL);
}
/* 32-bit timeval and related flotsam. */
asmlinkage long sys32_sysfs(int option, u32 arg1, u32 arg2)
{
return sys_sysfs(option, arg1, arg2);
}
asmlinkage long sys32_sched_rr_get_interval(compat_pid_t pid,
struct compat_timespec __user *interval)
{
struct timespec t;
int ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
set_fs(old_fs);
if (put_compat_timespec(&t, interval))
return -EFAULT;
return ret;
}
asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
compat_size_t sigsetsize)
{
sigset_t s;
compat_sigset_t s32;
int ret;
mm_segment_t old_fs = get_fs();
set_fs(KERNEL_DS);
ret = sys_rt_sigpending((sigset_t __user *)&s, sigsetsize);
set_fs(old_fs);
if (!ret) {
switch (_NSIG_WORDS) {
case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
}
if (copy_to_user(set, &s32, sizeof(compat_sigset_t)))
return -EFAULT;
}
return ret;
}
asmlinkage long sys32_rt_sigqueueinfo(int pid, int sig,
compat_siginfo_t __user *uinfo)
{
siginfo_t info;
int ret;
mm_segment_t old_fs = get_fs();
if (copy_siginfo_from_user32(&info, uinfo))
return -EFAULT;
set_fs(KERNEL_DS);
ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *)&info);
set_fs(old_fs);
return ret;
}
/* These are here just in case some old ia32 binary calls it. */
asmlinkage long sys32_pause(void)
{
current->state = TASK_INTERRUPTIBLE;
schedule();
return -ERESTARTNOHAND;
}
#ifdef CONFIG_SYSCTL_SYSCALL
struct sysctl_ia32 {
unsigned int name;
int nlen;
unsigned int oldval;
unsigned int oldlenp;
unsigned int newval;
unsigned int newlen;
unsigned int __unused[4];
};
asmlinkage long sys32_sysctl(struct sysctl_ia32 __user *args32)
{
struct sysctl_ia32 a32;
mm_segment_t old_fs = get_fs();
void __user *oldvalp, *newvalp;
size_t oldlen;
int __user *namep;
long ret;
if (copy_from_user(&a32, args32, sizeof(a32)))
return -EFAULT;
/*
* We need to pre-validate these because we have to disable
* address checking before calling do_sysctl() because of
* OLDLEN but we can't run the risk of the user specifying bad
* addresses here. Well, since we're dealing with 32 bit
* addresses, we KNOW that access_ok() will always succeed, so
* this is an expensive NOP, but so what...
*/
namep = compat_ptr(a32.name);
oldvalp = compat_ptr(a32.oldval);
newvalp = compat_ptr(a32.newval);
if ((oldvalp && get_user(oldlen, (int __user *)compat_ptr(a32.oldlenp)))
|| !access_ok(VERIFY_WRITE, namep, 0)
|| !access_ok(VERIFY_WRITE, oldvalp, 0)
|| !access_ok(VERIFY_WRITE, newvalp, 0))
return -EFAULT;
set_fs(KERNEL_DS);
lock_kernel();
ret = do_sysctl(namep, a32.nlen, oldvalp, (size_t __user *)&oldlen,
newvalp, (size_t) a32.newlen);
unlock_kernel();
set_fs(old_fs);
if (oldvalp && put_user(oldlen, (int __user *)compat_ptr(a32.oldlenp)))
return -EFAULT;
return ret;
}
#endif
/* warning: next two assume little endian */
asmlinkage long sys32_pread(unsigned int fd, char __user *ubuf, u32 count,
u32 poslo, u32 poshi)
{
return sys_pread64(fd, ubuf, count,
((loff_t)AA(poshi) << 32) | AA(poslo));
}
asmlinkage long sys32_pwrite(unsigned int fd, char __user *ubuf, u32 count,
u32 poslo, u32 poshi)
{
return sys_pwrite64(fd, ubuf, count,
((loff_t)AA(poshi) << 32) | AA(poslo));
}
asmlinkage long sys32_personality(unsigned long personality)
{
int ret;
if (personality(current->personality) == PER_LINUX32 &&
personality == PER_LINUX)
personality = PER_LINUX32;
ret = sys_personality(personality);
if (ret == PER_LINUX32)
ret = PER_LINUX;
return ret;
}
asmlinkage long sys32_sendfile(int out_fd, int in_fd,
compat_off_t __user *offset, s32 count)
{
mm_segment_t old_fs = get_fs();
int ret;
off_t of;
if (offset && get_user(of, offset))
return -EFAULT;
set_fs(KERNEL_DS);
ret = sys_sendfile(out_fd, in_fd, offset ? (off_t __user *)&of : NULL,
count);
set_fs(old_fs);
if (offset && put_user(of, offset))
return -EFAULT;
return ret;
}
asmlinkage long sys32_mmap2(unsigned long addr, unsigned long len,
unsigned long prot, unsigned long flags,
unsigned long fd, unsigned long pgoff)
{
struct mm_struct *mm = current->mm;
unsigned long error;
struct file *file = NULL;
flags &= ~(MAP_EXECUTABLE | MAP_DENYWRITE);
if (!(flags & MAP_ANONYMOUS)) {
file = fget(fd);
if (!file)
return -EBADF;
}
down_write(&mm->mmap_sem);
error = do_mmap_pgoff(file, addr, len, prot, flags, pgoff);
up_write(&mm->mmap_sem);
if (file)
fput(file);
return error;
}
asmlinkage long sys32_olduname(struct oldold_utsname __user *name)
{
char *arch = "x86_64";
int err;
if (!name)
return -EFAULT;
if (!access_ok(VERIFY_WRITE, name, sizeof(struct oldold_utsname)))
return -EFAULT;
down_read(&uts_sem);
err = __copy_to_user(&name->sysname, &utsname()->sysname,
__OLD_UTS_LEN);
err |= __put_user(0, name->sysname+__OLD_UTS_LEN);
err |= __copy_to_user(&name->nodename, &utsname()->nodename,
__OLD_UTS_LEN);
err |= __put_user(0, name->nodename+__OLD_UTS_LEN);
err |= __copy_to_user(&name->release, &utsname()->release,
__OLD_UTS_LEN);
err |= __put_user(0, name->release+__OLD_UTS_LEN);
err |= __copy_to_user(&name->version, &utsname()->version,
__OLD_UTS_LEN);
err |= __put_user(0, name->version+__OLD_UTS_LEN);
if (personality(current->personality) == PER_LINUX32)
arch = "i686";
err |= __copy_to_user(&name->machine, arch, strlen(arch) + 1);
up_read(&uts_sem);
err = err ? -EFAULT : 0;
return err;
}
long sys32_uname(struct old_utsname __user *name)
{
int err;
if (!name)
return -EFAULT;
down_read(&uts_sem);
err = copy_to_user(name, utsname(), sizeof(*name));
up_read(&uts_sem);
if (personality(current->personality) == PER_LINUX32)
err |= copy_to_user(&name->machine, "i686", 5);
return err ? -EFAULT : 0;
}
long sys32_ustat(unsigned dev, struct ustat32 __user *u32p)
{
struct ustat u;
mm_segment_t seg;
int ret;
seg = get_fs();
set_fs(KERNEL_DS);
ret = sys_ustat(dev, (struct ustat __user *)&u);
set_fs(seg);
if (ret < 0)
return ret;
if (!access_ok(VERIFY_WRITE, u32p, sizeof(struct ustat32)) ||
__put_user((__u32) u.f_tfree, &u32p->f_tfree) ||
__put_user((__u32) u.f_tinode, &u32p->f_tfree) ||
__copy_to_user(&u32p->f_fname, u.f_fname, sizeof(u.f_fname)) ||
__copy_to_user(&u32p->f_fpack, u.f_fpack, sizeof(u.f_fpack)))
ret = -EFAULT;
return ret;
}
asmlinkage long sys32_execve(char __user *name, compat_uptr_t __user *argv,
compat_uptr_t __user *envp, struct pt_regs *regs)
{
long error;
char *filename;
filename = getname(name);
error = PTR_ERR(filename);
if (IS_ERR(filename))
return error;
error = compat_do_execve(filename, argv, envp, regs);
putname(filename);
return error;
}
asmlinkage long sys32_clone(unsigned int clone_flags, unsigned int newsp,
struct pt_regs *regs)
{
void __user *parent_tid = (void __user *)regs->dx;
void __user *child_tid = (void __user *)regs->di;
if (!newsp)
newsp = regs->sp;
return do_fork(clone_flags, newsp, regs, 0, parent_tid, child_tid);
}
/*
* Some system calls that need sign extended arguments. This could be
* done by a generic wrapper.
*/
long sys32_lseek(unsigned int fd, int offset, unsigned int whence)
{
return sys_lseek(fd, offset, whence);
}
long sys32_kill(int pid, int sig)
{
return sys_kill(pid, sig);
}
long sys32_fadvise64_64(int fd, __u32 offset_low, __u32 offset_high,
__u32 len_low, __u32 len_high, int advice)
{
return sys_fadvise64_64(fd,
(((u64)offset_high)<<32) | offset_low,
(((u64)len_high)<<32) | len_low,
advice);
}
long sys32_vm86_warning(void)
{
struct task_struct *me = current;
static char lastcomm[sizeof(me->comm)];
if (strncmp(lastcomm, me->comm, sizeof(lastcomm))) {
compat_printk(KERN_INFO
"%s: vm86 mode not supported on 64 bit kernel\n",
me->comm);
strncpy(lastcomm, me->comm, sizeof(lastcomm));
}
return -ENOSYS;
}
long sys32_lookup_dcookie(u32 addr_low, u32 addr_high,
char __user *buf, size_t len)
{
return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
}
asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi,
size_t count)
{
return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
}
asmlinkage long sys32_sync_file_range(int fd, unsigned off_low, unsigned off_hi,
unsigned n_low, unsigned n_hi, int flags)
{
return sys_sync_file_range(fd,
((u64)off_hi << 32) | off_low,
((u64)n_hi << 32) | n_low, flags);
}
asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi,
size_t len, int advice)
{
return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
len, advice);
}
asmlinkage long sys32_fallocate(int fd, int mode, unsigned offset_lo,
unsigned offset_hi, unsigned len_lo,
unsigned len_hi)
{
return sys_fallocate(fd, mode, ((u64)offset_hi << 32) | offset_lo,
((u64)len_hi << 32) | len_lo);
}
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