compat.c 29.9 KB
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/*
 *  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>
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#include <linux/timex.h>
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#include <linux/export.h>
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#include <linux/migrate.h>
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#include <linux/posix-timers.h>
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#include <linux/times.h>
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#include <linux/ptrace.h>
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#include <linux/gfp.h>
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#include <asm/uaccess.h>

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/*
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 * Get/set struct timeval with struct timespec on the native side
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 */
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static int compat_get_timeval_convert(struct timespec *o,
				      struct compat_timeval __user *i)
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{
	long usec;

	if (get_user(o->tv_sec, &i->tv_sec) ||
	    get_user(usec, &i->tv_usec))
		return -EFAULT;
	o->tv_nsec = usec * 1000;
	return 0;
}

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static int compat_put_timeval_convert(struct compat_timeval __user *o,
				      struct timeval *i)
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{
	return (put_user(i->tv_sec, &o->tv_sec) ||
		put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;
}

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static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp)
{
	memset(txc, 0, sizeof(struct timex));

	if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||
			__get_user(txc->modes, &utp->modes) ||
			__get_user(txc->offset, &utp->offset) ||
			__get_user(txc->freq, &utp->freq) ||
			__get_user(txc->maxerror, &utp->maxerror) ||
			__get_user(txc->esterror, &utp->esterror) ||
			__get_user(txc->status, &utp->status) ||
			__get_user(txc->constant, &utp->constant) ||
			__get_user(txc->precision, &utp->precision) ||
			__get_user(txc->tolerance, &utp->tolerance) ||
			__get_user(txc->time.tv_sec, &utp->time.tv_sec) ||
			__get_user(txc->time.tv_usec, &utp->time.tv_usec) ||
			__get_user(txc->tick, &utp->tick) ||
			__get_user(txc->ppsfreq, &utp->ppsfreq) ||
			__get_user(txc->jitter, &utp->jitter) ||
			__get_user(txc->shift, &utp->shift) ||
			__get_user(txc->stabil, &utp->stabil) ||
			__get_user(txc->jitcnt, &utp->jitcnt) ||
			__get_user(txc->calcnt, &utp->calcnt) ||
			__get_user(txc->errcnt, &utp->errcnt) ||
			__get_user(txc->stbcnt, &utp->stbcnt))
		return -EFAULT;

	return 0;
}

static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc)
{
	if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||
			__put_user(txc->modes, &utp->modes) ||
			__put_user(txc->offset, &utp->offset) ||
			__put_user(txc->freq, &utp->freq) ||
			__put_user(txc->maxerror, &utp->maxerror) ||
			__put_user(txc->esterror, &utp->esterror) ||
			__put_user(txc->status, &utp->status) ||
			__put_user(txc->constant, &utp->constant) ||
			__put_user(txc->precision, &utp->precision) ||
			__put_user(txc->tolerance, &utp->tolerance) ||
			__put_user(txc->time.tv_sec, &utp->time.tv_sec) ||
			__put_user(txc->time.tv_usec, &utp->time.tv_usec) ||
			__put_user(txc->tick, &utp->tick) ||
			__put_user(txc->ppsfreq, &utp->ppsfreq) ||
			__put_user(txc->jitter, &utp->jitter) ||
			__put_user(txc->shift, &utp->shift) ||
			__put_user(txc->stabil, &utp->stabil) ||
			__put_user(txc->jitcnt, &utp->jitcnt) ||
			__put_user(txc->calcnt, &utp->calcnt) ||
			__put_user(txc->errcnt, &utp->errcnt) ||
			__put_user(txc->stbcnt, &utp->stbcnt) ||
			__put_user(txc->tai, &utp->tai))
		return -EFAULT;
	return 0;
}

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asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,
		struct timezone __user *tz)
{
	if (tv) {
		struct timeval ktv;
		do_gettimeofday(&ktv);
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		if (compat_put_timeval_convert(tv, &ktv))
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			return -EFAULT;
	}
	if (tz) {
		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))
			return -EFAULT;
	}

	return 0;
}

asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,
		struct timezone __user *tz)
{
	struct timespec kts;
	struct timezone ktz;

	if (tv) {
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		if (compat_get_timeval_convert(&kts, tv))
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			return -EFAULT;
	}
	if (tz) {
		if (copy_from_user(&ktz, tz, sizeof(ktz)))
			return -EFAULT;
	}

	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);
}

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int get_compat_timeval(struct timeval *tv, const struct compat_timeval __user *ctv)
{
	return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) ||
			__get_user(tv->tv_sec, &ctv->tv_sec) ||
			__get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
}
EXPORT_SYMBOL_GPL(get_compat_timeval);

int put_compat_timeval(const struct timeval *tv, struct compat_timeval __user *ctv)
{
	return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) ||
			__put_user(tv->tv_sec, &ctv->tv_sec) ||
			__put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
}
EXPORT_SYMBOL_GPL(put_compat_timeval);

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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;
}
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EXPORT_SYMBOL_GPL(get_compat_timespec);
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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;
}
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EXPORT_SYMBOL_GPL(put_compat_timespec);
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int compat_get_timeval(struct timeval *tv, const void __user *utv)
{
	if (COMPAT_USE_64BIT_TIME)
		return copy_from_user(tv, utv, sizeof *tv) ? -EFAULT : 0;
	else
		return get_compat_timeval(tv, utv);
}
EXPORT_SYMBOL_GPL(compat_get_timeval);

int compat_put_timeval(const struct timeval *tv, void __user *utv)
{
	if (COMPAT_USE_64BIT_TIME)
		return copy_to_user(utv, tv, sizeof *tv) ? -EFAULT : 0;
	else
		return put_compat_timeval(tv, utv);
}
EXPORT_SYMBOL_GPL(compat_put_timeval);

int compat_get_timespec(struct timespec *ts, const void __user *uts)
{
	if (COMPAT_USE_64BIT_TIME)
		return copy_from_user(ts, uts, sizeof *ts) ? -EFAULT : 0;
	else
		return get_compat_timespec(ts, uts);
}
EXPORT_SYMBOL_GPL(compat_get_timespec);

int compat_put_timespec(const struct timespec *ts, void __user *uts)
{
	if (COMPAT_USE_64BIT_TIME)
		return copy_to_user(uts, ts, sizeof *ts) ? -EFAULT : 0;
	else
		return put_compat_timespec(ts, uts);
}
EXPORT_SYMBOL_GPL(compat_put_timespec);

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static long compat_nanosleep_restart(struct restart_block *restart)
{
	struct compat_timespec __user *rmtp;
	struct timespec rmt;
	mm_segment_t oldfs;
	long ret;

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	restart->nanosleep.rmtp = (struct timespec __user *) &rmt;
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	oldfs = get_fs();
	set_fs(KERNEL_DS);
	ret = hrtimer_nanosleep_restart(restart);
	set_fs(oldfs);

	if (ret) {
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		rmtp = restart->nanosleep.compat_rmtp;
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		if (rmtp && put_compat_timespec(&rmt, rmtp))
			return -EFAULT;
	}

	return ret;
}

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asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,
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				     struct compat_timespec __user *rmtp)
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{
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	struct timespec tu, rmt;
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	mm_segment_t oldfs;
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	long ret;
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	if (get_compat_timespec(&tu, rqtp))
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		return -EFAULT;

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	if (!timespec_valid(&tu))
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		return -EINVAL;

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	oldfs = get_fs();
	set_fs(KERNEL_DS);
	ret = hrtimer_nanosleep(&tu,
				rmtp ? (struct timespec __user *)&rmt : NULL,
				HRTIMER_MODE_REL, CLOCK_MONOTONIC);
	set_fs(oldfs);

	if (ret) {
		struct restart_block *restart
			= &current_thread_info()->restart_block;

		restart->fn = compat_nanosleep_restart;
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		restart->nanosleep.compat_rmtp = rmtp;
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		if (rmtp && put_compat_timespec(&rmt, rmtp))
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			return -EFAULT;
	}
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	return ret;
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}

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) |
		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |
		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |
		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));
}

asmlinkage long compat_sys_getitimer(int which,
		struct compat_itimerval __user *it)
{
	struct itimerval kit;
	int error;

	error = do_getitimer(which, &kit);
	if (!error && put_compat_itimerval(it, &kit))
		error = -EFAULT;
	return error;
}

asmlinkage long compat_sys_setitimer(int which,
		struct compat_itimerval __user *in,
		struct compat_itimerval __user *out)
{
	struct itimerval kin, kout;
	int error;

	if (in) {
		if (get_compat_itimerval(&kin, in))
			return -EFAULT;
	} else
		memset(&kin, 0, sizeof(kin));

	error = do_setitimer(which, &kin, out ? &kout : NULL);
	if (error || !out)
		return error;
	if (put_compat_itimerval(out, &kout))
		return -EFAULT;
	return 0;
}

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static compat_clock_t clock_t_to_compat_clock_t(clock_t x)
{
	return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));
}

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asmlinkage long compat_sys_times(struct compat_tms __user *tbuf)
{
	if (tbuf) {
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		struct tms tms;
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		struct compat_tms tmp;
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		do_sys_times(&tms);
		/* Convert our struct tms to the compat version. */
		tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);
		tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);
		tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);
		tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);
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		if (copy_to_user(tbuf, &tmp, sizeof(tmp)))
			return -EFAULT;
	}
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	force_successful_syscall_return();
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	return compat_jiffies_to_clock_t(jiffies);
}

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#ifdef __ARCH_WANT_SYS_SIGPENDING

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/*
 * Assumption: old_sigset_t and compat_old_sigset_t are both
 * types that can be passed to put_user()/get_user().
 */

asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set)
{
	old_sigset_t s;
	long ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_sigpending((old_sigset_t __user *) &s);
	set_fs(old_fs);
	if (ret == 0)
		ret = put_user(s, set);
	return ret;
}

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#endif

#ifdef __ARCH_WANT_SYS_SIGPROCMASK

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asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,
		compat_old_sigset_t __user *oset)
{
	old_sigset_t s;
	long ret;
	mm_segment_t old_fs;

	if (set && get_user(s, set))
		return -EFAULT;
	old_fs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_sigprocmask(how,
			      set ? (old_sigset_t __user *) &s : NULL,
			      oset ? (old_sigset_t __user *) &s : NULL);
	set_fs(old_fs);
	if (ret == 0)
		if (oset)
			ret = put_user(s, oset);
	return ret;
}

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#endif

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asmlinkage long compat_sys_setrlimit(unsigned int resource,
		struct compat_rlimit __user *rlim)
{
	struct rlimit r;

	if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||
	    __get_user(r.rlim_cur, &rlim->rlim_cur) ||
	    __get_user(r.rlim_max, &rlim->rlim_max))
		return -EFAULT;

	if (r.rlim_cur == COMPAT_RLIM_INFINITY)
		r.rlim_cur = RLIM_INFINITY;
	if (r.rlim_max == COMPAT_RLIM_INFINITY)
		r.rlim_max = RLIM_INFINITY;
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	return do_prlimit(current, resource, &r, NULL);
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}

#ifdef COMPAT_RLIM_OLD_INFINITY

asmlinkage long compat_sys_old_getrlimit(unsigned int resource,
		struct compat_rlimit __user *rlim)
{
	struct rlimit r;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_old_getrlimit(resource, &r);
	set_fs(old_fs);

	if (!ret) {
		if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)
			r.rlim_cur = COMPAT_RLIM_INFINITY;
		if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)
			r.rlim_max = COMPAT_RLIM_INFINITY;

		if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
		    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
		    __put_user(r.rlim_max, &rlim->rlim_max))
			return -EFAULT;
	}
	return ret;
}

#endif

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asmlinkage long compat_sys_getrlimit(unsigned int resource,
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		struct compat_rlimit __user *rlim)
{
	struct rlimit r;
	int ret;

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	ret = do_prlimit(current, resource, NULL, &r);
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	if (!ret) {
		if (r.rlim_cur > COMPAT_RLIM_INFINITY)
			r.rlim_cur = COMPAT_RLIM_INFINITY;
		if (r.rlim_max > COMPAT_RLIM_INFINITY)
			r.rlim_max = COMPAT_RLIM_INFINITY;

		if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||
		    __put_user(r.rlim_cur, &rlim->rlim_cur) ||
		    __put_user(r.rlim_max, &rlim->rlim_max))
			return -EFAULT;
	}
	return ret;
}

int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
{
	if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||
	    __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||
	    __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||
	    __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||
	    __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||
	    __put_user(r->ru_maxrss, &ru->ru_maxrss) ||
	    __put_user(r->ru_ixrss, &ru->ru_ixrss) ||
	    __put_user(r->ru_idrss, &ru->ru_idrss) ||
	    __put_user(r->ru_isrss, &ru->ru_isrss) ||
	    __put_user(r->ru_minflt, &ru->ru_minflt) ||
	    __put_user(r->ru_majflt, &ru->ru_majflt) ||
	    __put_user(r->ru_nswap, &ru->ru_nswap) ||
	    __put_user(r->ru_inblock, &ru->ru_inblock) ||
	    __put_user(r->ru_oublock, &ru->ru_oublock) ||
	    __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||
	    __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||
	    __put_user(r->ru_nsignals, &ru->ru_nsignals) ||
	    __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||
	    __put_user(r->ru_nivcsw, &ru->ru_nivcsw))
		return -EFAULT;
	return 0;
}

asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru)
{
	struct rusage r;
	int ret;
	mm_segment_t old_fs = get_fs();

	set_fs(KERNEL_DS);
	ret = sys_getrusage(who, (struct rusage __user *) &r);
	set_fs(old_fs);

	if (ret)
		return ret;

	if (put_compat_rusage(&r, ru))
		return -EFAULT;

	return 0;
}

asmlinkage long
compat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,
	struct compat_rusage __user *ru)
{
	if (!ru) {
		return sys_wait4(pid, stat_addr, options, NULL);
	} else {
		struct rusage r;
		int ret;
		unsigned int status;
		mm_segment_t old_fs = get_fs();

		set_fs (KERNEL_DS);
		ret = sys_wait4(pid,
				(stat_addr ?
				 (unsigned int __user *) &status : NULL),
				options, (struct rusage __user *) &r);
		set_fs (old_fs);

		if (ret > 0) {
			if (put_compat_rusage(&r, ru))
				return -EFAULT;
			if (stat_addr && put_user(status, stat_addr))
				return -EFAULT;
		}
		return ret;
	}
}

asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,
		struct compat_siginfo __user *uinfo, int options,
		struct compat_rusage __user *uru)
{
	siginfo_t info;
	struct rusage ru;
	long ret;
	mm_segment_t old_fs = get_fs();

	memset(&info, 0, sizeof(info));

	set_fs(KERNEL_DS);
	ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,
			 uru ? (struct rusage __user *)&ru : NULL);
	set_fs(old_fs);

	if ((ret < 0) || (info.si_signo == 0))
		return ret;

	if (uru) {
		ret = put_compat_rusage(&ru, uru);
		if (ret)
			return ret;
	}

	BUG_ON(info.si_code & __SI_MASK);
	info.si_code |= __SI_CHLD;
	return copy_siginfo_to_user32(uinfo, &info);
}

static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
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				    unsigned len, struct cpumask *new_mask)
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{
	unsigned long *k;

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	if (len < cpumask_size())
		memset(new_mask, 0, cpumask_size());
	else if (len > cpumask_size())
		len = cpumask_size();
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	k = cpumask_bits(new_mask);
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	return compat_get_bitmap(k, user_mask_ptr, len * 8);
}

asmlinkage long compat_sys_sched_setaffinity(compat_pid_t pid,
					     unsigned int len,
					     compat_ulong_t __user *user_mask_ptr)
{
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	cpumask_var_t new_mask;
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	int retval;

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	if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
		return -ENOMEM;

	retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
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	if (retval)
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		goto out;
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	retval = sched_setaffinity(pid, new_mask);
out:
	free_cpumask_var(new_mask);
	return retval;
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}

asmlinkage long compat_sys_sched_getaffinity(compat_pid_t pid, unsigned int len,
					     compat_ulong_t __user *user_mask_ptr)
{
	int ret;
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	cpumask_var_t mask;
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	if ((len * BITS_PER_BYTE) < nr_cpu_ids)
		return -EINVAL;
	if (len & (sizeof(compat_ulong_t)-1))
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		return -EINVAL;

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	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
		return -ENOMEM;

	ret = sched_getaffinity(pid, mask);
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	if (ret == 0) {
		size_t retlen = min_t(size_t, len, cpumask_size());
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		if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
			ret = -EFAULT;
		else
			ret = retlen;
	}
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	free_cpumask_var(mask);
626

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	return ret;
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}

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int get_compat_itimerspec(struct itimerspec *dst,
			  const struct compat_itimerspec __user *src)
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{
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	if (get_compat_timespec(&dst->it_interval, &src->it_interval) ||
	    get_compat_timespec(&dst->it_value, &src->it_value))
		return -EFAULT;
	return 0;
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}
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int put_compat_itimerspec(struct compat_itimerspec __user *dst,
			  const struct itimerspec *src)
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{
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	if (put_compat_timespec(&src->it_interval, &dst->it_interval) ||
	    put_compat_timespec(&src->it_value, &dst->it_value))
		return -EFAULT;
	return 0;
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}
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long compat_sys_timer_create(clockid_t which_clock,
			struct compat_sigevent __user *timer_event_spec,
			timer_t __user *created_timer_id)
{
	struct sigevent __user *event = NULL;

	if (timer_event_spec) {
		struct sigevent kevent;

		event = compat_alloc_user_space(sizeof(*event));
		if (get_compat_sigevent(&kevent, timer_event_spec) ||
		    copy_to_user(event, &kevent, sizeof(*event)))
			return -EFAULT;
	}

	return sys_timer_create(which_clock, event, created_timer_id);
}

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long compat_sys_timer_settime(timer_t timer_id, int flags,
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			  struct compat_itimerspec __user *new,
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			  struct compat_itimerspec __user *old)
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{
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	long err;
	mm_segment_t oldfs;
	struct itimerspec newts, oldts;

	if (!new)
		return -EINVAL;
	if (get_compat_itimerspec(&newts, new))
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		return -EFAULT;
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	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_timer_settime(timer_id, flags,
				(struct itimerspec __user *) &newts,
				(struct itimerspec __user *) &oldts);
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	set_fs(oldfs);
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	if (!err && old && put_compat_itimerspec(old, &oldts))
		return -EFAULT;
	return err;
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}
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long compat_sys_timer_gettime(timer_t timer_id,
		struct compat_itimerspec __user *setting)
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{
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	long err;
	mm_segment_t oldfs;
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	struct itimerspec ts;
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	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_timer_gettime(timer_id,
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				(struct itimerspec __user *) &ts);
	set_fs(oldfs);
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	if (!err && put_compat_itimerspec(setting, &ts))
		return -EFAULT;
	return err;
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}
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long compat_sys_clock_settime(clockid_t which_clock,
		struct compat_timespec __user *tp)
{
	long err;
	mm_segment_t oldfs;
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	struct timespec ts;
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	if (get_compat_timespec(&ts, tp))
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		return -EFAULT;
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	oldfs = get_fs();
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	set_fs(KERNEL_DS);
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	err = sys_clock_settime(which_clock,
				(struct timespec __user *) &ts);
	set_fs(oldfs);
	return err;
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}
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long compat_sys_clock_gettime(clockid_t which_clock,
		struct compat_timespec __user *tp)
{
	long err;
	mm_segment_t oldfs;
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	struct timespec ts;
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	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_clock_gettime(which_clock,
				(struct timespec __user *) &ts);
	set_fs(oldfs);
	if (!err && put_compat_timespec(&ts, tp))
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		return -EFAULT;
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	return err;
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}
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long compat_sys_clock_adjtime(clockid_t which_clock,
		struct compat_timex __user *utp)
{
	struct timex txc;
	mm_segment_t oldfs;
	int err, ret;

	err = compat_get_timex(&txc, utp);
	if (err)
		return err;

	oldfs = get_fs();
	set_fs(KERNEL_DS);
	ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
	set_fs(oldfs);

	err = compat_put_timex(utp, &txc);
	if (err)
		return err;

	return ret;
}

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long compat_sys_clock_getres(clockid_t which_clock,
		struct compat_timespec __user *tp)
{
	long err;
	mm_segment_t oldfs;
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	struct timespec ts;
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	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_clock_getres(which_clock,
			       (struct timespec __user *) &ts);
	set_fs(oldfs);
	if (!err && tp && put_compat_timespec(&ts, tp))
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		return -EFAULT;
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	return err;
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}
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static long compat_clock_nanosleep_restart(struct restart_block *restart)
{
	long err;
	mm_segment_t oldfs;
	struct timespec tu;
785
	struct compat_timespec *rmtp = restart->nanosleep.compat_rmtp;
786

787
	restart->nanosleep.rmtp = (struct timespec __user *) &tu;
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	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = clock_nanosleep_restart(restart);
	set_fs(oldfs);

	if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
	    put_compat_timespec(&tu, rmtp))
		return -EFAULT;

	if (err == -ERESTART_RESTARTBLOCK) {
		restart->fn = compat_clock_nanosleep_restart;
799
		restart->nanosleep.compat_rmtp = rmtp;
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	}
	return err;
}

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long compat_sys_clock_nanosleep(clockid_t which_clock, int flags,
			    struct compat_timespec __user *rqtp,
			    struct compat_timespec __user *rmtp)
{
	long err;
	mm_segment_t oldfs;
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	struct timespec in, out;
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	struct restart_block *restart;
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	if (get_compat_timespec(&in, rqtp))
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		return -EFAULT;

	oldfs = get_fs();
	set_fs(KERNEL_DS);
	err = sys_clock_nanosleep(which_clock, flags,
				  (struct timespec __user *) &in,
				  (struct timespec __user *) &out);
	set_fs(oldfs);
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	if ((err == -ERESTART_RESTARTBLOCK) && rmtp &&
	    put_compat_timespec(&out, rmtp))
		return -EFAULT;
826 827 828 829

	if (err == -ERESTART_RESTARTBLOCK) {
		restart = &current_thread_info()->restart_block;
		restart->fn = compat_clock_nanosleep_restart;
830
		restart->nanosleep.compat_rmtp = rmtp;
831
	}
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	return err;
}
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/*
 * We currently only need the following fields from the sigevent
 * structure: sigev_value, sigev_signo, sig_notify and (sometimes
 * sigev_notify_thread_id).  The others are handled in user mode.
 * We also assume that copying sigev_value.sival_int is sufficient
 * to keep all the bits of sigev_value.sival_ptr intact.
 */
int get_compat_sigevent(struct sigevent *event,
		const struct compat_sigevent __user *u_event)
{
845
	memset(event, 0, sizeof(*event));
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	return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) ||
		__get_user(event->sigev_value.sival_int,
			&u_event->sigev_value.sival_int) ||
		__get_user(event->sigev_signo, &u_event->sigev_signo) ||
		__get_user(event->sigev_notify, &u_event->sigev_notify) ||
		__get_user(event->sigev_notify_thread_id,
			&u_event->sigev_notify_thread_id))
		? -EFAULT : 0;
}

856
long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
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		       unsigned long bitmap_size)
{
	int i, j;
	unsigned long m;
	compat_ulong_t um;
	unsigned long nr_compat_longs;

	/* align bitmap up to nearest compat_long_t boundary */
	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);

	if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
		return -EFAULT;

	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);

	for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
		m = 0;

		for (j = 0; j < sizeof(m)/sizeof(um); j++) {
			/*
			 * We dont want to read past the end of the userspace
			 * bitmap. We must however ensure the end of the
			 * kernel bitmap is zeroed.
			 */
			if (nr_compat_longs-- > 0) {
				if (__get_user(um, umask))
					return -EFAULT;
			} else {
				um = 0;
			}

			umask++;
			m |= (long)um << (j * BITS_PER_COMPAT_LONG);
		}
		*mask++ = m;
	}

	return 0;
}

long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
		       unsigned long bitmap_size)
{
	int i, j;
	unsigned long m;
	compat_ulong_t um;
	unsigned long nr_compat_longs;

	/* align bitmap up to nearest compat_long_t boundary */
	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);

	if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
		return -EFAULT;

	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);

	for (i = 0; i < BITS_TO_LONGS(bitmap_size); i++) {
		m = *mask++;

		for (j = 0; j < sizeof(m)/sizeof(um); j++) {
			um = m;

			/*
			 * We dont want to write past the end of the userspace
			 * bitmap.
			 */
			if (nr_compat_longs-- > 0) {
				if (__put_user(um, umask))
					return -EFAULT;
			}

			umask++;
			m >>= 4*sizeof(um);
			m >>= 4*sizeof(um);
		}
	}

	return 0;
}

void
sigset_from_compat (sigset_t *set, compat_sigset_t *compat)
{
	switch (_NSIG_WORDS) {
	case 4: set->sig[3] = compat->sig[6] | (((long)compat->sig[7]) << 32 );
	case 3: set->sig[2] = compat->sig[4] | (((long)compat->sig[5]) << 32 );
	case 2: set->sig[1] = compat->sig[2] | (((long)compat->sig[3]) << 32 );
	case 1: set->sig[0] = compat->sig[0] | (((long)compat->sig[1]) << 32 );
	}
}
947
EXPORT_SYMBOL_GPL(sigset_from_compat);
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asmlinkage long
compat_sys_rt_sigtimedwait (compat_sigset_t __user *uthese,
		struct compat_siginfo __user *uinfo,
		struct compat_timespec __user *uts, compat_size_t sigsetsize)
{
	compat_sigset_t s32;
	sigset_t s;
	struct timespec t;
	siginfo_t info;
958
	long ret;
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	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	if (copy_from_user(&s32, uthese, sizeof(compat_sigset_t)))
		return -EFAULT;
	sigset_from_compat(&s, &s32);

	if (uts) {
968
		if (get_compat_timespec(&t, uts))
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			return -EFAULT;
	}

972
	ret = do_sigtimedwait(&s, &info, uts ? &t : NULL);
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974 975 976
	if (ret > 0 && uinfo) {
		if (copy_siginfo_to_user32(uinfo, &info))
			ret = -EFAULT;
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	}
978

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	return ret;

}

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asmlinkage long
compat_sys_rt_tgsigqueueinfo(compat_pid_t tgid, compat_pid_t pid, int sig,
			     struct compat_siginfo __user *uinfo)
{
	siginfo_t info;

	if (copy_siginfo_from_user32(&info, uinfo))
		return -EFAULT;
	return do_rt_tgsigqueueinfo(tgid, pid, sig, &info);
}

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#ifdef __ARCH_WANT_COMPAT_SYS_TIME

/* compat_time_t is a 32 bit "long" and needs to get converted. */

asmlinkage long compat_sys_time(compat_time_t __user * tloc)
{
	compat_time_t i;
	struct timeval tv;

	do_gettimeofday(&tv);
	i = tv.tv_sec;

	if (tloc) {
		if (put_user(i,tloc))
1008
			return -EFAULT;
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	}
1010
	force_successful_syscall_return();
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	return i;
}

asmlinkage long compat_sys_stime(compat_time_t __user *tptr)
{
	struct timespec tv;
	int err;

	if (get_user(tv.tv_sec, tptr))
		return -EFAULT;

	tv.tv_nsec = 0;

	err = security_settime(&tv, NULL);
	if (err)
		return err;

	do_settimeofday(&tv);
	return 0;
}

#endif /* __ARCH_WANT_COMPAT_SYS_TIME */
1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049

#ifdef __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND
asmlinkage long compat_sys_rt_sigsuspend(compat_sigset_t __user *unewset, compat_size_t sigsetsize)
{
	sigset_t newset;
	compat_sigset_t newset32;

	/* XXX: Don't preclude handling different sized sigset_t's.  */
	if (sigsetsize != sizeof(sigset_t))
		return -EINVAL;

	if (copy_from_user(&newset32, unewset, sizeof(compat_sigset_t)))
		return -EFAULT;
	sigset_from_compat(&newset, &newset32);
	sigdelsetmask(&newset, sigmask(SIGKILL)|sigmask(SIGSTOP));

	current->saved_sigmask = current->blocked;
1050
	set_current_blocked(&newset);
1051 1052 1053

	current->state = TASK_INTERRUPTIBLE;
	schedule();
1054
	set_restore_sigmask();
1055 1056 1057
	return -ERESTARTNOHAND;
}
#endif /* __ARCH_WANT_COMPAT_SYS_RT_SIGSUSPEND */
1058 1059 1060 1061

asmlinkage long compat_sys_adjtimex(struct compat_timex __user *utp)
{
	struct timex txc;
1062
	int err, ret;
1063

1064 1065 1066
	err = compat_get_timex(&txc, utp);
	if (err)
		return err;
1067 1068 1069

	ret = do_adjtimex(&txc);

1070 1071 1072
	err = compat_put_timex(utp, &txc);
	if (err)
		return err;
1073 1074 1075

	return ret;
}
1076 1077 1078

#ifdef CONFIG_NUMA
asmlinkage long compat_sys_move_pages(pid_t pid, unsigned long nr_pages,
1079
		compat_uptr_t __user *pages32,
1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090
		const int __user *nodes,
		int __user *status,
		int flags)
{
	const void __user * __user *pages;
	int i;

	pages = compat_alloc_user_space(nr_pages * sizeof(void *));
	for (i = 0; i < nr_pages; i++) {
		compat_uptr_t p;

1091
		if (get_user(p, pages32 + i) ||
1092 1093 1094 1095 1096
			put_user(compat_ptr(p), pages + i))
			return -EFAULT;
	}
	return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
}
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129

asmlinkage long compat_sys_migrate_pages(compat_pid_t pid,
			compat_ulong_t maxnode,
			const compat_ulong_t __user *old_nodes,
			const compat_ulong_t __user *new_nodes)
{
	unsigned long __user *old = NULL;
	unsigned long __user *new = NULL;
	nodemask_t tmp_mask;
	unsigned long nr_bits;
	unsigned long size;

	nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
	size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
	if (old_nodes) {
		if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
			return -EFAULT;
		old = compat_alloc_user_space(new_nodes ? size * 2 : size);
		if (new_nodes)
			new = old + size / sizeof(unsigned long);
		if (copy_to_user(old, nodes_addr(tmp_mask), size))
			return -EFAULT;
	}
	if (new_nodes) {
		if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
			return -EFAULT;
		if (new == NULL)
			new = compat_alloc_user_space(size);
		if (copy_to_user(new, nodes_addr(tmp_mask), size))
			return -EFAULT;
	}
	return sys_migrate_pages(pid, nr_bits + 1, old, new);
}
1130
#endif
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struct compat_sysinfo {
	s32 uptime;
	u32 loads[3];
	u32 totalram;
	u32 freeram;
	u32 sharedram;
	u32 bufferram;
	u32 totalswap;
	u32 freeswap;
	u16 procs;
	u16 pad;
	u32 totalhigh;
	u32 freehigh;
	u32 mem_unit;
	char _f[20-2*sizeof(u32)-sizeof(int)];
};

asmlinkage long
compat_sys_sysinfo(struct compat_sysinfo __user *info)
{
	struct sysinfo s;

	do_sysinfo(&s);

	/* Check to see if any memory value is too large for 32-bit and scale
	 *  down if needed
	 */
	if ((s.totalram >> 32) || (s.totalswap >> 32)) {
		int bitcount = 0;

		while (s.mem_unit < PAGE_SIZE) {
			s.mem_unit <<= 1;
			bitcount++;
		}

		s.totalram >>= bitcount;
		s.freeram >>= bitcount;
		s.sharedram >>= bitcount;
		s.bufferram >>= bitcount;
		s.totalswap >>= bitcount;
		s.freeswap >>= bitcount;
		s.totalhigh >>= bitcount;
		s.freehigh >>= bitcount;
	}

	if (!access_ok(VERIFY_WRITE, info, sizeof(struct compat_sysinfo)) ||
	    __put_user (s.uptime, &info->uptime) ||
	    __put_user (s.loads[0], &info->loads[0]) ||
	    __put_user (s.loads[1], &info->loads[1]) ||
	    __put_user (s.loads[2], &info->loads[2]) ||
	    __put_user (s.totalram, &info->totalram) ||
	    __put_user (s.freeram, &info->freeram) ||
	    __put_user (s.sharedram, &info->sharedram) ||
	    __put_user (s.bufferram, &info->bufferram) ||
	    __put_user (s.totalswap, &info->totalswap) ||
	    __put_user (s.freeswap, &info->freeswap) ||
	    __put_user (s.procs, &info->procs) ||
	    __put_user (s.totalhigh, &info->totalhigh) ||
	    __put_user (s.freehigh, &info->freehigh) ||
	    __put_user (s.mem_unit, &info->mem_unit))
		return -EFAULT;

	return 0;
}
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/*
 * Allocate user-space memory for the duration of a single system call,
 * in order to marshall parameters inside a compat thunk.
 */
void __user *compat_alloc_user_space(unsigned long len)
{
	void __user *ptr;

	/* If len would occupy more than half of the entire compat space... */
	if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
		return NULL;

	ptr = arch_compat_alloc_user_space(len);

	if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
		return NULL;

	return ptr;
}
EXPORT_SYMBOL_GPL(compat_alloc_user_space);