/*
* linux/kernel/compat.c
*
* Kernel compatibililty routines for e.g. 32 bit syscall support
* on 64 bit kernels.
*
* Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/linkage.h>
#include <linux/compat.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/signal.h>
#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
#include <linux/syscalls.h>
#include <linux/unistd.h>
#include <linux/security.h>
#include <linux/timex.h>
#include <linux/migrate.h>
#include <linux/posix-timers.h>
#include <asm/uaccess.h>
extern void sigset_from_compat(sigset_t *set, compat_sigset_t *compat);
int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts)
{
return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||
__get_user(ts->tv_sec, &cts->tv_sec) ||
__get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}
int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts)
{
return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||
__put_user(ts->tv_sec, &cts->tv_sec) ||
__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
}
static long compat_nanosleep_restart(struct restart_block *restart)
{
unsigned long expire = restart->arg0, now = jiffies;
struct compat_timespec __user *rmtp;
/* Did it expire while we handled signals? */
if (!time_after(expire, now))
return 0;
expire = schedule_timeout_interruptible(expire - now);
if (expire == 0)
return 0;
rmtp = (struct compat_timespec __user *)restart->arg1;
if (rmtp) {
struct compat_timespec ct;
struct timespec t;
jiffies_to_timespec(expire, &t);
ct.tv_sec = t.tv_sec;
ct.tv_nsec = t.tv_nsec;
if (copy_to_user(rmtp, &ct, sizeof(ct)))
return -EFAULT;
}
/* The 'restart' block is already filled in */
return -ERESTART_RESTARTBLOCK;
}
asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
struct compat_timespec __user *rmtp)
{
struct timespec t;
struct restart_block *restart;
unsigned long expire;
if (get_compat_timespec(&t, rqtp))
return -EFAULT;
if ((t.tv_nsec >= 1000000000L) || (t.tv_nsec < 0) || (t.tv_sec < 0))
return -EINVAL;
expire = timespec_to_jiffies(&t) + (t.tv_sec || t.tv_nsec);
expire = schedule_timeout_interruptible(expire);
if (expire == 0)
return 0;
if (rmtp) {
jiffies_to_timespec(expire, &t);
if (put_compat_timespec(&t, rmtp))
return -EFAULT;
}
restart = ¤t_thread_info()->restart_block;
restart->fn = compat_nanosleep_restart;
restart->arg0 = jiffies + expire;
restart->arg1 = (unsigned long) rmtp;
return -ERESTART_RESTARTBLOCK;
}
static inline long get_compat_itimerval(struct itimerval *o,
struct compat_itimerval __user *i)
{
return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||
(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |
__get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |
__get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |
__get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));
}
static inline long put_compat_itimerval(struct compat_itimerval __user *o,
struct itimerval *i)
{
return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||
(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |
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