[linux.git] / kernel / compat.c

/*
 *  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/export.h>
#include <linux/migrate.h>
#include <linux/posix-timers.h>
#include <linux/times.h>
#include <linux/ptrace.h>
#include <linux/gfp.h>

#include <linux/uaccess.h>

int compat_get_timex(struct timex *txc, const struct compat_timex __user *utp)
{
	struct compat_timex tx32;

	if (copy_from_user(&tx32, utp, sizeof(struct compat_timex)))
		return -EFAULT;

	txc->modes = tx32.modes;
	txc->offset = tx32.offset;
	txc->freq = tx32.freq;
	txc->maxerror = tx32.maxerror;
	txc->esterror = tx32.esterror;
	txc->status = tx32.status;
	txc->constant = tx32.constant;
	txc->precision = tx32.precision;
	txc->tolerance = tx32.tolerance;
	txc->time.tv_sec = tx32.time.tv_sec;
	txc->time.tv_usec = tx32.time.tv_usec;
	txc->tick = tx32.tick;
	txc->ppsfreq = tx32.ppsfreq;
	txc->jitter = tx32.jitter;
	txc->shift = tx32.shift;
	txc->stabil = tx32.stabil;
	txc->jitcnt = tx32.jitcnt;
	txc->calcnt = tx32.calcnt;
	txc->errcnt = tx32.errcnt;
	txc->stbcnt = tx32.stbcnt;

	return 0;
}

int compat_put_timex(struct compat_timex __user *utp, const struct timex *txc)
{
	struct compat_timex tx32;

	memset(&tx32, 0, sizeof(struct compat_timex));
	tx32.modes = txc->modes;
	tx32.offset = txc->offset;
	tx32.freq = txc->freq;
	tx32.maxerror = txc->maxerror;
	tx32.esterror = txc->esterror;
	tx32.status = txc->status;
	tx32.constant = txc->constant;
	tx32.precision = txc->precision;
	tx32.tolerance = txc->tolerance;
	tx32.time.tv_sec = txc->time.tv_sec;
	tx32.time.tv_usec = txc->time.tv_usec;
	tx32.tick = txc->tick;
	tx32.ppsfreq = txc->ppsfreq;
	tx32.jitter = txc->jitter;
	tx32.shift = txc->shift;
	tx32.stabil = txc->stabil;
	tx32.jitcnt = txc->jitcnt;
	tx32.calcnt = txc->calcnt;
	tx32.errcnt = txc->errcnt;
	tx32.stbcnt = txc->stbcnt;
	tx32.tai = txc->tai;
	if (copy_to_user(utp, &tx32, sizeof(struct compat_timex)))
		return -EFAULT;
	return 0;
}

static int __compat_get_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;
}

static int __compat_put_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;
}

static int __compat_get_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;
}

static int __compat_put_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 int __compat_get_timespec64(struct timespec64 *ts64,
				   const struct compat_timespec __user *cts)
{
	struct compat_timespec ts;
	int ret;

	ret = copy_from_user(&ts, cts, sizeof(ts));
	if (ret)
		return -EFAULT;

	ts64->tv_sec = ts.tv_sec;
	ts64->tv_nsec = ts.tv_nsec;

	return 0;
}

static int __compat_put_timespec64(const struct timespec64 *ts64,
				   struct compat_timespec __user *cts)
{
	struct compat_timespec ts = {
		.tv_sec = ts64->tv_sec,
		.tv_nsec = ts64->tv_nsec
	};
	return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
}

int compat_get_timespec64(struct timespec64 *ts, const void __user *uts)
{
	if (COMPAT_USE_64BIT_TIME)
		return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
	else
		return __compat_get_timespec64(ts, uts);
}
EXPORT_SYMBOL_GPL(compat_get_timespec64);

int compat_put_timespec64(const struct timespec64 *ts, void __user *uts)
{
	if (COMPAT_USE_64BIT_TIME)
		return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
	else
		return __compat_put_timespec64(ts, uts);
}
EXPORT_SYMBOL_GPL(compat_put_timespec64);

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 __compat_get_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 __compat_put_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 __compat_get_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 __compat_put_timespec(ts, uts);
}
EXPORT_SYMBOL_GPL(compat_put_timespec);

int compat_convert_timespec(struct timespec __user **kts,
			    const void __user *cts)
{
	struct timespec ts;
	struct timespec __user *uts;

	if (!cts || COMPAT_USE_64BIT_TIME) {
		*kts = (struct timespec __user *)cts;
		return 0;
	}

	uts = compat_alloc_user_space(sizeof(ts));
	if (!uts)
		return -EFAULT;
	if (compat_get_timespec(&ts, cts))
		return -EFAULT;
	if (copy_to_user(uts, &ts, sizeof(ts)))
		return -EFAULT;

	*kts = uts;
	return 0;
}

int get_compat_itimerval(struct itimerval *o, const struct compat_itimerval __user *i)
{
	struct compat_itimerval v32;

	if (copy_from_user(&v32, i, sizeof(struct compat_itimerval)))
		return -EFAULT;
	o->it_interval.tv_sec = v32.it_interval.tv_sec;
	o->it_interval.tv_usec = v32.it_interval.tv_usec;
	o->it_value.tv_sec = v32.it_value.tv_sec;
	o->it_value.tv_usec = v32.it_value.tv_usec;
	return 0;
}

int put_compat_itimerval(struct compat_itimerval __user *o, const struct itimerval *i)
{
	struct compat_itimerval v32;

	v32.it_interval.tv_sec = i->it_interval.tv_sec;
	v32.it_interval.tv_usec = i->it_interval.tv_usec;
	v32.it_value.tv_sec = i->it_value.tv_sec;
	v32.it_value.tv_usec = i->it_value.tv_usec;
	return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0;
}

#ifdef __ARCH_WANT_SYS_SIGPROCMASK

/*
 * sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
 * blocked set of signals to the supplied signal set
 */
static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
{
	memcpy(blocked->sig, &set, sizeof(set));
}

COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
		       compat_old_sigset_t __user *, nset,
		       compat_old_sigset_t __user *, oset)
{
	old_sigset_t old_set, new_set;
	sigset_t new_blocked;

	old_set = current->blocked.sig[0];

	if (nset) {
		if (get_user(new_set, nset))
			return -EFAULT;
		new_set &= ~(sigmask(SIGKILL) | sigmask(SIGSTOP));

		new_blocked = current->blocked;

		switch (how) {
		case SIG_BLOCK:
			sigaddsetmask(&new_blocked, new_set);
			break;
		case SIG_UNBLOCK:
			sigdelsetmask(&new_blocked, new_set);
			break;
		case SIG_SETMASK:
			compat_sig_setmask(&new_blocked, new_set);
			break;
		default:
			return -EINVAL;
		}

		set_current_blocked(&new_blocked);
	}

	if (oset) {
		if (put_user(old_set, oset))
			return -EFAULT;
	}

	return 0;
}

#endif

int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru)
{
	struct compat_rusage r32;
	memset(&r32, 0, sizeof(r32));
	r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
	r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
	r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
	r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
	r32.ru_maxrss = r->ru_maxrss;
	r32.ru_ixrss = r->ru_ixrss;
	r32.ru_idrss = r->ru_idrss;
	r32.ru_isrss = r->ru_isrss;
	r32.ru_minflt = r->ru_minflt;
	r32.ru_majflt = r->ru_majflt;
	r32.ru_nswap = r->ru_nswap;
	r32.ru_inblock = r->ru_inblock;
	r32.ru_oublock = r->ru_oublock;
	r32.ru_msgsnd = r->ru_msgsnd;
	r32.ru_msgrcv = r->ru_msgrcv;
	r32.ru_nsignals = r->ru_nsignals;
	r32.ru_nvcsw = r->ru_nvcsw;
	r32.ru_nivcsw = r->ru_nivcsw;
	if (copy_to_user(ru, &r32, sizeof(r32)))
		return -EFAULT;
	return 0;
}

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

	if (len < cpumask_size())
		memset(new_mask, 0, cpumask_size());
	else if (len > cpumask_size())
		len = cpumask_size();

	k = cpumask_bits(new_mask);
	return compat_get_bitmap(k, user_mask_ptr, len * 8);
}

COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
		       unsigned int, len,
		       compat_ulong_t __user *, user_mask_ptr)
{
	cpumask_var_t new_mask;
	int retval;

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

	retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
	if (retval)
		goto out;

	retval = sched_setaffinity(pid, new_mask);
out:
	free_cpumask_var(new_mask);
	return retval;
}

COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t,  pid, unsigned int, len,
		       compat_ulong_t __user *, user_mask_ptr)
{
	int ret;
	cpumask_var_t mask;

	if ((len * BITS_PER_BYTE) < nr_cpu_ids)
		return -EINVAL;
	if (len & (sizeof(compat_ulong_t)-1))
		return -EINVAL;

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

	ret = sched_getaffinity(pid, mask);
	if (ret == 0) {
		size_t retlen = min_t(size_t, len, cpumask_size());

		if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
			ret = -EFAULT;
		else
			ret = retlen;
	}
	free_cpumask_var(mask);

	return ret;
}

int get_compat_itimerspec(struct itimerspec *dst,
			  const struct compat_itimerspec __user *src)
{
	if (__compat_get_timespec(&dst->it_interval, &src->it_interval) ||
	    __compat_get_timespec(&dst->it_value, &src->it_value))
		return -EFAULT;
	return 0;
}

int put_compat_itimerspec(struct compat_itimerspec __user *dst,
			  const struct itimerspec *src)
{
	if (__compat_put_timespec(&src->it_interval, &dst->it_interval) ||
	    __compat_put_timespec(&src->it_value, &dst->it_value))
		return -EFAULT;
	return 0;
}

int get_compat_itimerspec64(struct itimerspec64 *its,
			const struct compat_itimerspec __user *uits)
{

	if (__compat_get_timespec64(&its->it_interval, &uits->it_interval) ||
	    __compat_get_timespec64(&its->it_value, &uits->it_value))
		return -EFAULT;
	return 0;
}
EXPORT_SYMBOL_GPL(get_compat_itimerspec64);

int put_compat_itimerspec64(const struct itimerspec64 *its,
			struct compat_itimerspec __user *uits)
{
	if (__compat_put_timespec64(&its->it_interval, &uits->it_interval) ||
	    __compat_put_timespec64(&its->it_value, &uits->it_value))
		return -EFAULT;
	return 0;
}
EXPORT_SYMBOL_GPL(put_compat_itimerspec64);

/*
 * 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)
{
	memset(event, 0, sizeof(*event));
	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;
}

long compat_get_bitmap(unsigned long *mask, const compat_ulong_t __user *umask,
		       unsigned long bitmap_size)
{
	unsigned long nr_compat_longs;

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

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

	user_access_begin();
	while (nr_compat_longs > 1) {
		compat_ulong_t l1, l2;
		unsafe_get_user(l1, umask++, Efault);
		unsafe_get_user(l2, umask++, Efault);
		*mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) | l1;
		nr_compat_longs -= 2;
	}
	if (nr_compat_longs)
		unsafe_get_user(*mask, umask++, Efault);
	user_access_end();
	return 0;

Efault:
	user_access_end();
	return -EFAULT;
}

long compat_put_bitmap(compat_ulong_t __user *umask, unsigned long *mask,
		       unsigned long bitmap_size)
{
	unsigned long nr_compat_longs;

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

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

	user_access_begin();
	while (nr_compat_longs > 1) {
		unsigned long m = *mask++;
		unsafe_put_user((compat_ulong_t)m, umask++, Efault);
		unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
		nr_compat_longs -= 2;
	}
	if (nr_compat_longs)
		unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
	user_access_end();
	return 0;
Efault:
	user_access_end();
	return -EFAULT;
}

void
sigset_from_compat(sigset_t *set, const 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 );
	}
}
EXPORT_SYMBOL_GPL(sigset_from_compat);

void
sigset_to_compat(compat_sigset_t *compat, const sigset_t *set)
{
	switch (_NSIG_WORDS) {
	case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
	case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
	case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
	case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
	}
}

#ifdef CONFIG_NUMA
COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
		       compat_uptr_t __user *, pages32,
		       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;

		if (get_user(p, pages32 + i) ||
			put_user(compat_ptr(p), pages + i))
			return -EFAULT;
	}
	return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
}

COMPAT_SYSCALL_DEFINE4(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);
}
#endif

COMPAT_SYSCALL_DEFINE2(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 (compat_put_timespec(&t, interval))
		return -EFAULT;
	return ret;
}

/*
 * 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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/kernel/compat.c
	3	*
	4	* Kernel compatibililty routines for e.g. 32 bit syscall support
	5	* on 64 bit kernels.
	6	*
	7	* Copyright (C) 2002-2003 Stephen Rothwell, IBM Corporation
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13
	14	#include <linux/linkage.h>
	15	#include <linux/compat.h>
	16	#include <linux/errno.h>
	17	#include <linux/time.h>
	18	#include <linux/signal.h>
	19	#include <linux/sched.h> /* for MAX_SCHEDULE_TIMEOUT */
1da177e4 LT	20	#include <linux/syscalls.h>
	21	#include <linux/unistd.h>
	22	#include <linux/security.h>
3158e941	23	#include <linux/timex.h>
6e5fdeed	24	#include <linux/export.h>
1b2db9fb	25	#include <linux/migrate.h>
1711ef38	26	#include <linux/posix-timers.h>
f06febc9	27	#include <linux/times.h>
e3d5a27d	28	#include <linux/ptrace.h>
5a0e3ad6	29	#include <linux/gfp.h>
1da177e4	30
7c0f6ba6	31	#include <linux/uaccess.h>
1da177e4	32
3a4d44b6 AV	33	int compat_get_timex(struct timex txc, const struct compat_timex __user utp)
	34	{
	35	struct compat_timex tx32;
	36
	37	if (copy_from_user(&tx32, utp, sizeof(struct compat_timex)))
65f5d80b RC	38	return -EFAULT;
65f5d80b RC	39
3a4d44b6 AV	40	txc->modes = tx32.modes;
	41	txc->offset = tx32.offset;
	42	txc->freq = tx32.freq;
	43	txc->maxerror = tx32.maxerror;
	44	txc->esterror = tx32.esterror;
	45	txc->status = tx32.status;
	46	txc->constant = tx32.constant;
	47	txc->precision = tx32.precision;
	48	txc->tolerance = tx32.tolerance;
	49	txc->time.tv_sec = tx32.time.tv_sec;
	50	txc->time.tv_usec = tx32.time.tv_usec;
	51	txc->tick = tx32.tick;
	52	txc->ppsfreq = tx32.ppsfreq;
	53	txc->jitter = tx32.jitter;
	54	txc->shift = tx32.shift;
	55	txc->stabil = tx32.stabil;
	56	txc->jitcnt = tx32.jitcnt;
	57	txc->calcnt = tx32.calcnt;
	58	txc->errcnt = tx32.errcnt;
	59	txc->stbcnt = tx32.stbcnt;
	60
65f5d80b RC	61	return 0;
	62	}
	63
3a4d44b6 AV	64	int compat_put_timex(struct compat_timex __user utp, const struct timex txc)
	65	{
	66	struct compat_timex tx32;
	67
	68	memset(&tx32, 0, sizeof(struct compat_timex));
	69	tx32.modes = txc->modes;
	70	tx32.offset = txc->offset;
	71	tx32.freq = txc->freq;
	72	tx32.maxerror = txc->maxerror;
	73	tx32.esterror = txc->esterror;
	74	tx32.status = txc->status;
	75	tx32.constant = txc->constant;
	76	tx32.precision = txc->precision;
	77	tx32.tolerance = txc->tolerance;
	78	tx32.time.tv_sec = txc->time.tv_sec;
	79	tx32.time.tv_usec = txc->time.tv_usec;
	80	tx32.tick = txc->tick;
	81	tx32.ppsfreq = txc->ppsfreq;
	82	tx32.jitter = txc->jitter;
	83	tx32.shift = txc->shift;
	84	tx32.stabil = txc->stabil;
	85	tx32.jitcnt = txc->jitcnt;
	86	tx32.calcnt = txc->calcnt;
	87	tx32.errcnt = txc->errcnt;
	88	tx32.stbcnt = txc->stbcnt;
	89	tx32.tai = txc->tai;
	90	if (copy_to_user(utp, &tx32, sizeof(struct compat_timex)))
65f5d80b RC	91	return -EFAULT;
	92	return 0;
	93	}
	94
81993e81	95	static int __compat_get_timeval(struct timeval tv, const struct compat_timeval __user ctv)
6684ba20 PA	96	{
	97	return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) \|\|
	98	__get_user(tv->tv_sec, &ctv->tv_sec) \|\|
	99	__get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
	100	}
6684ba20	101
81993e81	102	static int __compat_put_timeval(const struct timeval tv, struct compat_timeval __user ctv)
6684ba20 PA	103	{
	104	return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) \|\|
	105	__put_user(tv->tv_sec, &ctv->tv_sec) \|\|
	106	__put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
	107	}
6684ba20	108
81993e81	109	static int __compat_get_timespec(struct timespec ts, const struct compat_timespec __user cts)
1da177e4 LT	110	{
	111	return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) \|\|
	112	__get_user(ts->tv_sec, &cts->tv_sec) \|\|
	113	__get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
	114	}
	115
81993e81	116	static int __compat_put_timespec(const struct timespec ts, struct compat_timespec __user cts)
1da177e4 LT	117	{
	118	return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) \|\|
	119	__put_user(ts->tv_sec, &cts->tv_sec) \|\|
	120	__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
	121	}
	122
f59dd9c8 DD	123	static int __compat_get_timespec64(struct timespec64 *ts64,
	124	const struct compat_timespec __user *cts)
	125	{
	126	struct compat_timespec ts;
	127	int ret;
	128
	129	ret = copy_from_user(&ts, cts, sizeof(ts));
	130	if (ret)
	131	return -EFAULT;
	132
	133	ts64->tv_sec = ts.tv_sec;
	134	ts64->tv_nsec = ts.tv_nsec;
	135
	136	return 0;
	137	}
	138
	139	static int __compat_put_timespec64(const struct timespec64 *ts64,
	140	struct compat_timespec __user *cts)
	141	{
	142	struct compat_timespec ts = {
	143	.tv_sec = ts64->tv_sec,
	144	.tv_nsec = ts64->tv_nsec
	145	};
	146	return copy_to_user(cts, &ts, sizeof(ts)) ? -EFAULT : 0;
	147	}
	148
	149	int compat_get_timespec64(struct timespec64 ts, const void __user uts)
	150	{
	151	if (COMPAT_USE_64BIT_TIME)
	152	return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
	153	else
	154	return __compat_get_timespec64(ts, uts);
	155	}
	156	EXPORT_SYMBOL_GPL(compat_get_timespec64);
	157
	158	int compat_put_timespec64(const struct timespec64 ts, void __user uts)
	159	{
	160	if (COMPAT_USE_64BIT_TIME)
	161	return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
	162	else
	163	return __compat_put_timespec64(ts, uts);
	164	}
	165	EXPORT_SYMBOL_GPL(compat_put_timespec64);
	166
6684ba20 PA	167	int compat_get_timeval(struct timeval tv, const void __user utv)
	168	{
	169	if (COMPAT_USE_64BIT_TIME)
6516a466	170	return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
6684ba20	171	else
81993e81	172	return __compat_get_timeval(tv, utv);
6684ba20 PA	173	}
	174	EXPORT_SYMBOL_GPL(compat_get_timeval);
	175
	176	int compat_put_timeval(const struct timeval tv, void __user utv)
	177	{
	178	if (COMPAT_USE_64BIT_TIME)
6516a466	179	return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
6684ba20	180	else
81993e81	181	return __compat_put_timeval(tv, utv);
6684ba20 PA	182	}
	183	EXPORT_SYMBOL_GPL(compat_put_timeval);
	184
	185	int compat_get_timespec(struct timespec ts, const void __user uts)
	186	{
	187	if (COMPAT_USE_64BIT_TIME)
6516a466	188	return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
6684ba20	189	else
81993e81	190	return __compat_get_timespec(ts, uts);
6684ba20 PA	191	}
	192	EXPORT_SYMBOL_GPL(compat_get_timespec);
	193
	194	int compat_put_timespec(const struct timespec ts, void __user uts)
	195	{
	196	if (COMPAT_USE_64BIT_TIME)
6516a466	197	return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
6684ba20	198	else
81993e81	199	return __compat_put_timespec(ts, uts);
6684ba20 PA	200	}
	201	EXPORT_SYMBOL_GPL(compat_put_timespec);
	202
81993e81 PA	203	int compat_convert_timespec(struct timespec __user **kts,
	204	const void __user *cts)
	205	{
	206	struct timespec ts;
	207	struct timespec __user *uts;
	208
	209	if (!cts \|\| COMPAT_USE_64BIT_TIME) {
	210	kts = (struct timespec __user )cts;
	211	return 0;
	212	}
	213
	214	uts = compat_alloc_user_space(sizeof(ts));
	215	if (!uts)
	216	return -EFAULT;
	217	if (compat_get_timespec(&ts, cts))
	218	return -EFAULT;
	219	if (copy_to_user(uts, &ts, sizeof(ts)))
	220	return -EFAULT;
	221
	222	*kts = uts;
	223	return 0;
	224	}
	225
54ad9c46	226	int get_compat_itimerval(struct itimerval o, const struct compat_itimerval __user i)
1da177e4	227	{
54ad9c46	228	struct compat_itimerval v32;
baa73d9e	229
54ad9c46 AV	230	if (copy_from_user(&v32, i, sizeof(struct compat_itimerval)))
	231	return -EFAULT;
	232	o->it_interval.tv_sec = v32.it_interval.tv_sec;
	233	o->it_interval.tv_usec = v32.it_interval.tv_usec;
	234	o->it_value.tv_sec = v32.it_value.tv_sec;
	235	o->it_value.tv_usec = v32.it_value.tv_usec;
	236	return 0;
1da177e4 LT	237	}
1da177e4 LT	238
54ad9c46	239	int put_compat_itimerval(struct compat_itimerval __user o, const struct itimerval i)
1da177e4	240	{
54ad9c46	241	struct compat_itimerval v32;
1da177e4	242
54ad9c46 AV	243	v32.it_interval.tv_sec = i->it_interval.tv_sec;
	244	v32.it_interval.tv_usec = i->it_interval.tv_usec;
	245	v32.it_value.tv_sec = i->it_value.tv_sec;
	246	v32.it_value.tv_usec = i->it_value.tv_usec;
	247	return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0;
1da177e4 LT	248	}
1da177e4 LT	249
be84cb43 CM	250	#ifdef __ARCH_WANT_SYS_SIGPROCMASK
be84cb43 CM	251
b7dafa0e JK	252	/*
	253	* sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
	254	* blocked set of signals to the supplied signal set
	255	*/
	256	static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
1da177e4	257	{
b7dafa0e JK	258	memcpy(blocked->sig, &set, sizeof(set));
b7dafa0e JK	259	}
1da177e4	260
5cf22100 AV	261	COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
	262	compat_old_sigset_t __user *, nset,
	263	compat_old_sigset_t __user *, oset)
b7dafa0e JK	264	{
	265	old_sigset_t old_set, new_set;
	266	sigset_t new_blocked;
	267
	268	old_set = current->blocked.sig[0];
	269
	270	if (nset) {
	271	if (get_user(new_set, nset))
	272	return -EFAULT;
	273	new_set &= ~(sigmask(SIGKILL) \| sigmask(SIGSTOP));
	274
	275	new_blocked = current->blocked;
	276
	277	switch (how) {
	278	case SIG_BLOCK:
	279	sigaddsetmask(&new_blocked, new_set);
	280	break;
	281	case SIG_UNBLOCK:
	282	sigdelsetmask(&new_blocked, new_set);
	283	break;
	284	case SIG_SETMASK:
	285	compat_sig_setmask(&new_blocked, new_set);
	286	break;
	287	default:
	288	return -EINVAL;
	289	}
	290
	291	set_current_blocked(&new_blocked);
	292	}
	293
	294	if (oset) {
	295	if (put_user(old_set, oset))
	296	return -EFAULT;
	297	}
	298
	299	return 0;
1da177e4 LT	300	}
1da177e4 LT	301
be84cb43 CM	302	#endif
be84cb43 CM	303
1da177e4 LT	304	int put_compat_rusage(const struct rusage r, struct compat_rusage __user ru)
1da177e4 LT	305	{
7668b679 AV	306	struct compat_rusage r32;
	307	memset(&r32, 0, sizeof(r32));
	308	r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
	309	r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
	310	r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
	311	r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
	312	r32.ru_maxrss = r->ru_maxrss;
	313	r32.ru_ixrss = r->ru_ixrss;
	314	r32.ru_idrss = r->ru_idrss;
	315	r32.ru_isrss = r->ru_isrss;
	316	r32.ru_minflt = r->ru_minflt;
	317	r32.ru_majflt = r->ru_majflt;
	318	r32.ru_nswap = r->ru_nswap;
	319	r32.ru_inblock = r->ru_inblock;
	320	r32.ru_oublock = r->ru_oublock;
	321	r32.ru_msgsnd = r->ru_msgsnd;
	322	r32.ru_msgrcv = r->ru_msgrcv;
	323	r32.ru_nsignals = r->ru_nsignals;
	324	r32.ru_nvcsw = r->ru_nvcsw;
	325	r32.ru_nivcsw = r->ru_nivcsw;
	326	if (copy_to_user(ru, &r32, sizeof(r32)))
1da177e4 LT	327	return -EFAULT;
	328	return 0;
	329	}
	330
1da177e4	331	static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2	332	unsigned len, struct cpumask *new_mask)
1da177e4 LT	333	{
	334	unsigned long *k;
	335
a45185d2 RR	336	if (len < cpumask_size())
	337	memset(new_mask, 0, cpumask_size());
	338	else if (len > cpumask_size())
	339	len = cpumask_size();
1da177e4	340
a45185d2	341	k = cpumask_bits(new_mask);
1da177e4 LT	342	return compat_get_bitmap(k, user_mask_ptr, len * 8);
	343	}
	344
62a6fa97 HC	345	COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
	346	unsigned int, len,
	347	compat_ulong_t __user *, user_mask_ptr)
1da177e4	348	{
a45185d2	349	cpumask_var_t new_mask;
1da177e4 LT	350	int retval;
1da177e4 LT	351
a45185d2 RR	352	if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
	353	return -ENOMEM;
	354
	355	retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4	356	if (retval)
a45185d2	357	goto out;
1da177e4	358
a45185d2 RR	359	retval = sched_setaffinity(pid, new_mask);
	360	out:
	361	free_cpumask_var(new_mask);
	362	return retval;
1da177e4 LT	363	}
1da177e4 LT	364
62a6fa97 HC	365	COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
62a6fa97 HC	366	compat_ulong_t __user *, user_mask_ptr)
1da177e4 LT	367	{
1da177e4 LT	368	int ret;
a45185d2	369	cpumask_var_t mask;
1da177e4	370
fa9dc265 KM	371	if ((len * BITS_PER_BYTE) < nr_cpu_ids)
	372	return -EINVAL;
	373	if (len & (sizeof(compat_ulong_t)-1))
1da177e4 LT	374	return -EINVAL;
1da177e4 LT	375
a45185d2 RR	376	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
	377	return -ENOMEM;
	378
	379	ret = sched_getaffinity(pid, mask);
fa9dc265 KM	380	if (ret == 0) {
fa9dc265 KM	381	size_t retlen = min_t(size_t, len, cpumask_size());
1da177e4	382
fa9dc265 KM	383	if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
	384	ret = -EFAULT;
	385	else
	386	ret = retlen;
	387	}
a45185d2	388	free_cpumask_var(mask);
fa9dc265	389
a45185d2	390	return ret;
1da177e4 LT	391	}
1da177e4 LT	392
83f5d126 DL	393	int get_compat_itimerspec(struct itimerspec *dst,
83f5d126 DL	394	const struct compat_itimerspec __user *src)
bd3a8492	395	{
81993e81 PA	396	if (__compat_get_timespec(&dst->it_interval, &src->it_interval) \|\|
81993e81 PA	397	__compat_get_timespec(&dst->it_value, &src->it_value))
1da177e4 LT	398	return -EFAULT;
1da177e4 LT	399	return 0;
bd3a8492	400	}
1da177e4	401
83f5d126 DL	402	int put_compat_itimerspec(struct compat_itimerspec __user *dst,
83f5d126 DL	403	const struct itimerspec *src)
bd3a8492	404	{
81993e81 PA	405	if (__compat_put_timespec(&src->it_interval, &dst->it_interval) \|\|
81993e81 PA	406	__compat_put_timespec(&src->it_value, &dst->it_value))
1da177e4 LT	407	return -EFAULT;
1da177e4 LT	408	return 0;
bd3a8492	409	}
1da177e4	410
d5b7ffbf DD	411	int get_compat_itimerspec64(struct itimerspec64 *its,
	412	const struct compat_itimerspec __user *uits)
	413	{
	414
	415	if (__compat_get_timespec64(&its->it_interval, &uits->it_interval) \|\|
	416	__compat_get_timespec64(&its->it_value, &uits->it_value))
	417	return -EFAULT;
	418	return 0;
	419	}
	420	EXPORT_SYMBOL_GPL(get_compat_itimerspec64);
	421
	422	int put_compat_itimerspec64(const struct itimerspec64 *its,
	423	struct compat_itimerspec __user *uits)
	424	{
	425	if (__compat_put_timespec64(&its->it_interval, &uits->it_interval) \|\|
	426	__compat_put_timespec64(&its->it_value, &uits->it_value))
	427	return -EFAULT;
	428	return 0;
	429	}
	430	EXPORT_SYMBOL_GPL(put_compat_itimerspec64);
	431
1da177e4 LT	432	/*
	433	* We currently only need the following fields from the sigevent
	434	* structure: sigev_value, sigev_signo, sig_notify and (sometimes
	435	* sigev_notify_thread_id). The others are handled in user mode.
	436	* We also assume that copying sigev_value.sival_int is sufficient
	437	* to keep all the bits of sigev_value.sival_ptr intact.
	438	*/
	439	int get_compat_sigevent(struct sigevent *event,
	440	const struct compat_sigevent __user *u_event)
	441	{
51410d3c	442	memset(event, 0, sizeof(*event));
1da177e4 LT	443	return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) \|\|
	444	__get_user(event->sigev_value.sival_int,
	445	&u_event->sigev_value.sival_int) \|\|
	446	__get_user(event->sigev_signo, &u_event->sigev_signo) \|\|
	447	__get_user(event->sigev_notify, &u_event->sigev_notify) \|\|
	448	__get_user(event->sigev_notify_thread_id,
	449	&u_event->sigev_notify_thread_id))
	450	? -EFAULT : 0;
	451	}
	452
5fa3839a	453	long compat_get_bitmap(unsigned long mask, const compat_ulong_t __user umask,
1da177e4 LT	454	unsigned long bitmap_size)
1da177e4 LT	455	{
1da177e4 LT	456	unsigned long nr_compat_longs;
	457
	458	/* align bitmap up to nearest compat_long_t boundary */
	459	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
1e1fc133	460	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
1da177e4 LT	461
	462	if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
	463	return -EFAULT;
	464
1e1fc133 AV	465	user_access_begin();
	466	while (nr_compat_longs > 1) {
	467	compat_ulong_t l1, l2;
	468	unsafe_get_user(l1, umask++, Efault);
	469	unsafe_get_user(l2, umask++, Efault);
	470	*mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) \| l1;
	471	nr_compat_longs -= 2;
1da177e4	472	}
1e1fc133 AV	473	if (nr_compat_longs)
	474	unsafe_get_user(*mask, umask++, Efault);
	475	user_access_end();
1da177e4	476	return 0;
1e1fc133 AV	477
	478	Efault:
	479	user_access_end();
	480	return -EFAULT;
1da177e4 LT	481	}
	482
	483	long compat_put_bitmap(compat_ulong_t __user umask, unsigned long mask,
	484	unsigned long bitmap_size)
	485	{
1da177e4 LT	486	unsigned long nr_compat_longs;
	487
	488	/* align bitmap up to nearest compat_long_t boundary */
	489	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
1e1fc133	490	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
1da177e4 LT	491
	492	if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
	493	return -EFAULT;
	494
1e1fc133 AV	495	user_access_begin();
	496	while (nr_compat_longs > 1) {
	497	unsigned long m = *mask++;
	498	unsafe_put_user((compat_ulong_t)m, umask++, Efault);
	499	unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
	500	nr_compat_longs -= 2;
1da177e4	501	}
1e1fc133 AV	502	if (nr_compat_longs)
	503	unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
	504	user_access_end();
1da177e4	505	return 0;
1e1fc133 AV	506	Efault:
	507	user_access_end();
	508	return -EFAULT;
1da177e4 LT	509	}
	510
	511	void
322a56cb	512	sigset_from_compat(sigset_t set, const compat_sigset_t compat)
1da177e4 LT	513	{
1da177e4 LT	514	switch (_NSIG_WORDS) {
1da177e4 LT	515	case 4: set->sig[3] = compat->sig[6] \| (((long)compat->sig[7]) << 32 );
	516	case 3: set->sig[2] = compat->sig[4] \| (((long)compat->sig[5]) << 32 );
	517	case 2: set->sig[1] = compat->sig[2] \| (((long)compat->sig[3]) << 32 );
	518	case 1: set->sig[0] = compat->sig[0] \| (((long)compat->sig[1]) << 32 );
1da177e4 LT	519	}
1da177e4 LT	520	}
1dda606c	521	EXPORT_SYMBOL_GPL(sigset_from_compat);
1da177e4	522
322a56cb AV	523	void
	524	sigset_to_compat(compat_sigset_t compat, const sigset_t set)
	525	{
	526	switch (_NSIG_WORDS) {
	527	case 4: compat->sig[7] = (set->sig[3] >> 32); compat->sig[6] = set->sig[3];
	528	case 3: compat->sig[5] = (set->sig[2] >> 32); compat->sig[4] = set->sig[2];
	529	case 2: compat->sig[3] = (set->sig[1] >> 32); compat->sig[2] = set->sig[1];
	530	case 1: compat->sig[1] = (set->sig[0] >> 32); compat->sig[0] = set->sig[0];
	531	}
	532	}
	533
1b2db9fb	534	#ifdef CONFIG_NUMA
2f2728f6 HC	535	COMPAT_SYSCALL_DEFINE6(move_pages, pid_t, pid, compat_ulong_t, nr_pages,
	536	compat_uptr_t __user *, pages32,
	537	const int __user *, nodes,
	538	int __user *, status,
	539	int, flags)
1b2db9fb CL	540	{
	541	const void __user * __user *pages;
	542	int i;
	543
	544	pages = compat_alloc_user_space(nr_pages * sizeof(void *));
	545	for (i = 0; i < nr_pages; i++) {
	546	compat_uptr_t p;
	547
9216dfad	548	if (get_user(p, pages32 + i) \|\|
1b2db9fb CL	549	put_user(compat_ptr(p), pages + i))
	550	return -EFAULT;
	551	}
	552	return sys_move_pages(pid, nr_pages, pages, nodes, status, flags);
	553	}
3fd59397	554
62a6fa97 HC	555	COMPAT_SYSCALL_DEFINE4(migrate_pages, compat_pid_t, pid,
	556	compat_ulong_t, maxnode,
	557	const compat_ulong_t __user *, old_nodes,
	558	const compat_ulong_t __user *, new_nodes)
3fd59397 SR	559	{
	560	unsigned long __user *old = NULL;
	561	unsigned long __user *new = NULL;
	562	nodemask_t tmp_mask;
	563	unsigned long nr_bits;
	564	unsigned long size;
	565
	566	nr_bits = min_t(unsigned long, maxnode - 1, MAX_NUMNODES);
	567	size = ALIGN(nr_bits, BITS_PER_LONG) / 8;
	568	if (old_nodes) {
	569	if (compat_get_bitmap(nodes_addr(tmp_mask), old_nodes, nr_bits))
	570	return -EFAULT;
	571	old = compat_alloc_user_space(new_nodes ? size * 2 : size);
	572	if (new_nodes)
	573	new = old + size / sizeof(unsigned long);
	574	if (copy_to_user(old, nodes_addr(tmp_mask), size))
	575	return -EFAULT;
	576	}
	577	if (new_nodes) {
	578	if (compat_get_bitmap(nodes_addr(tmp_mask), new_nodes, nr_bits))
	579	return -EFAULT;
	580	if (new == NULL)
	581	new = compat_alloc_user_space(size);
	582	if (copy_to_user(new, nodes_addr(tmp_mask), size))
	583	return -EFAULT;
	584	}
	585	return sys_migrate_pages(pid, nr_bits + 1, old, new);
	586	}
1b2db9fb	587	#endif
d4d23add	588
6883da8c AV	589	COMPAT_SYSCALL_DEFINE2(sched_rr_get_interval,
	590	compat_pid_t, pid,
	591	struct compat_timespec __user *, interval)
0ad50c38 CM	592	{
	593	struct timespec t;
	594	int ret;
	595	mm_segment_t old_fs = get_fs();
	596
	597	set_fs(KERNEL_DS);
	598	ret = sys_sched_rr_get_interval(pid, (struct timespec __user *)&t);
	599	set_fs(old_fs);
81993e81	600	if (compat_put_timespec(&t, interval))
0ad50c38 CM	601	return -EFAULT;
	602	return ret;
	603	}
0ad50c38	604
c41d68a5 PA	605	/*
	606	* Allocate user-space memory for the duration of a single system call,
	607	* in order to marshall parameters inside a compat thunk.
	608	*/
	609	void __user *compat_alloc_user_space(unsigned long len)
	610	{
	611	void __user *ptr;
	612
	613	/* If len would occupy more than half of the entire compat space... */
	614	if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
	615	return NULL;
	616
	617	ptr = arch_compat_alloc_user_space(len);
	618
	619	if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
	620	return NULL;
	621
	622	return ptr;
	623	}
	624	EXPORT_SYMBOL_GPL(compat_alloc_user_space);