[linux-2.6-block.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 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) {
		unsigned int retlen = min(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_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;
}

int
get_compat_sigset(sigset_t *set, const compat_sigset_t __user *compat)
{
#ifdef __BIG_ENDIAN
	compat_sigset_t v;
	if (copy_from_user(&v, compat, sizeof(compat_sigset_t)))
		return -EFAULT;
	switch (_NSIG_WORDS) {
	case 4: set->sig[3] = v.sig[6] | (((long)v.sig[7]) << 32 );
	case 3: set->sig[2] = v.sig[4] | (((long)v.sig[5]) << 32 );
	case 2: set->sig[1] = v.sig[2] | (((long)v.sig[3]) << 32 );
	case 1: set->sig[0] = v.sig[0] | (((long)v.sig[1]) << 32 );
	}
#else
	if (copy_from_user(set, compat, sizeof(compat_sigset_t)))
		return -EFAULT;
#endif
	return 0;
}
EXPORT_SYMBOL_GPL(get_compat_sigset);

/*
 * 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
54ad9c46	203	int get_compat_itimerval(struct itimerval o, const struct compat_itimerval __user i)
1da177e4	204	{
54ad9c46	205	struct compat_itimerval v32;
baa73d9e	206
54ad9c46 AV	207	if (copy_from_user(&v32, i, sizeof(struct compat_itimerval)))
	208	return -EFAULT;
	209	o->it_interval.tv_sec = v32.it_interval.tv_sec;
	210	o->it_interval.tv_usec = v32.it_interval.tv_usec;
	211	o->it_value.tv_sec = v32.it_value.tv_sec;
	212	o->it_value.tv_usec = v32.it_value.tv_usec;
	213	return 0;
1da177e4 LT	214	}
1da177e4 LT	215
54ad9c46	216	int put_compat_itimerval(struct compat_itimerval __user o, const struct itimerval i)
1da177e4	217	{
54ad9c46	218	struct compat_itimerval v32;
1da177e4	219
54ad9c46 AV	220	v32.it_interval.tv_sec = i->it_interval.tv_sec;
	221	v32.it_interval.tv_usec = i->it_interval.tv_usec;
	222	v32.it_value.tv_sec = i->it_value.tv_sec;
	223	v32.it_value.tv_usec = i->it_value.tv_usec;
	224	return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0;
1da177e4 LT	225	}
1da177e4 LT	226
be84cb43 CM	227	#ifdef __ARCH_WANT_SYS_SIGPROCMASK
be84cb43 CM	228
b7dafa0e JK	229	/*
	230	* sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
	231	* blocked set of signals to the supplied signal set
	232	*/
	233	static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
1da177e4	234	{
b7dafa0e JK	235	memcpy(blocked->sig, &set, sizeof(set));
b7dafa0e JK	236	}
1da177e4	237
5cf22100 AV	238	COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
	239	compat_old_sigset_t __user *, nset,
	240	compat_old_sigset_t __user *, oset)
b7dafa0e JK	241	{
	242	old_sigset_t old_set, new_set;
	243	sigset_t new_blocked;
	244
	245	old_set = current->blocked.sig[0];
	246
	247	if (nset) {
	248	if (get_user(new_set, nset))
	249	return -EFAULT;
	250	new_set &= ~(sigmask(SIGKILL) \| sigmask(SIGSTOP));
	251
	252	new_blocked = current->blocked;
	253
	254	switch (how) {
	255	case SIG_BLOCK:
	256	sigaddsetmask(&new_blocked, new_set);
	257	break;
	258	case SIG_UNBLOCK:
	259	sigdelsetmask(&new_blocked, new_set);
	260	break;
	261	case SIG_SETMASK:
	262	compat_sig_setmask(&new_blocked, new_set);
	263	break;
	264	default:
	265	return -EINVAL;
	266	}
	267
	268	set_current_blocked(&new_blocked);
	269	}
	270
	271	if (oset) {
	272	if (put_user(old_set, oset))
	273	return -EFAULT;
	274	}
	275
	276	return 0;
1da177e4 LT	277	}
1da177e4 LT	278
be84cb43 CM	279	#endif
be84cb43 CM	280
1da177e4 LT	281	int put_compat_rusage(const struct rusage r, struct compat_rusage __user ru)
1da177e4 LT	282	{
7668b679 AV	283	struct compat_rusage r32;
	284	memset(&r32, 0, sizeof(r32));
	285	r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
	286	r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
	287	r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
	288	r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
	289	r32.ru_maxrss = r->ru_maxrss;
	290	r32.ru_ixrss = r->ru_ixrss;
	291	r32.ru_idrss = r->ru_idrss;
	292	r32.ru_isrss = r->ru_isrss;
	293	r32.ru_minflt = r->ru_minflt;
	294	r32.ru_majflt = r->ru_majflt;
	295	r32.ru_nswap = r->ru_nswap;
	296	r32.ru_inblock = r->ru_inblock;
	297	r32.ru_oublock = r->ru_oublock;
	298	r32.ru_msgsnd = r->ru_msgsnd;
	299	r32.ru_msgrcv = r->ru_msgrcv;
	300	r32.ru_nsignals = r->ru_nsignals;
	301	r32.ru_nvcsw = r->ru_nvcsw;
	302	r32.ru_nivcsw = r->ru_nivcsw;
	303	if (copy_to_user(ru, &r32, sizeof(r32)))
1da177e4 LT	304	return -EFAULT;
	305	return 0;
	306	}
	307
1da177e4	308	static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2	309	unsigned len, struct cpumask *new_mask)
1da177e4 LT	310	{
	311	unsigned long *k;
	312
a45185d2 RR	313	if (len < cpumask_size())
	314	memset(new_mask, 0, cpumask_size());
	315	else if (len > cpumask_size())
	316	len = cpumask_size();
1da177e4	317
a45185d2	318	k = cpumask_bits(new_mask);
1da177e4 LT	319	return compat_get_bitmap(k, user_mask_ptr, len * 8);
	320	}
	321
62a6fa97 HC	322	COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
	323	unsigned int, len,
	324	compat_ulong_t __user *, user_mask_ptr)
1da177e4	325	{
a45185d2	326	cpumask_var_t new_mask;
1da177e4 LT	327	int retval;
1da177e4 LT	328
a45185d2 RR	329	if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
	330	return -ENOMEM;
	331
	332	retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4	333	if (retval)
a45185d2	334	goto out;
1da177e4	335
a45185d2 RR	336	retval = sched_setaffinity(pid, new_mask);
	337	out:
	338	free_cpumask_var(new_mask);
	339	return retval;
1da177e4 LT	340	}
1da177e4 LT	341
62a6fa97 HC	342	COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
62a6fa97 HC	343	compat_ulong_t __user *, user_mask_ptr)
1da177e4 LT	344	{
1da177e4 LT	345	int ret;
a45185d2	346	cpumask_var_t mask;
1da177e4	347
fa9dc265 KM	348	if ((len * BITS_PER_BYTE) < nr_cpu_ids)
	349	return -EINVAL;
	350	if (len & (sizeof(compat_ulong_t)-1))
1da177e4 LT	351	return -EINVAL;
1da177e4 LT	352
a45185d2 RR	353	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
	354	return -ENOMEM;
	355
	356	ret = sched_getaffinity(pid, mask);
fa9dc265	357	if (ret == 0) {
4de373a1	358	unsigned int retlen = min(len, cpumask_size());
1da177e4	359
fa9dc265 KM	360	if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
	361	ret = -EFAULT;
	362	else
	363	ret = retlen;
	364	}
a45185d2	365	free_cpumask_var(mask);
fa9dc265	366
a45185d2	367	return ret;
1da177e4 LT	368	}
1da177e4 LT	369
d5b7ffbf DD	370	int get_compat_itimerspec64(struct itimerspec64 *its,
	371	const struct compat_itimerspec __user *uits)
	372	{
	373
	374	if (__compat_get_timespec64(&its->it_interval, &uits->it_interval) \|\|
	375	__compat_get_timespec64(&its->it_value, &uits->it_value))
	376	return -EFAULT;
	377	return 0;
	378	}
	379	EXPORT_SYMBOL_GPL(get_compat_itimerspec64);
	380
	381	int put_compat_itimerspec64(const struct itimerspec64 *its,
	382	struct compat_itimerspec __user *uits)
	383	{
	384	if (__compat_put_timespec64(&its->it_interval, &uits->it_interval) \|\|
	385	__compat_put_timespec64(&its->it_value, &uits->it_value))
	386	return -EFAULT;
	387	return 0;
	388	}
	389	EXPORT_SYMBOL_GPL(put_compat_itimerspec64);
	390
1da177e4 LT	391	/*
	392	* We currently only need the following fields from the sigevent
	393	* structure: sigev_value, sigev_signo, sig_notify and (sometimes
	394	* sigev_notify_thread_id). The others are handled in user mode.
	395	* We also assume that copying sigev_value.sival_int is sufficient
	396	* to keep all the bits of sigev_value.sival_ptr intact.
	397	*/
	398	int get_compat_sigevent(struct sigevent *event,
	399	const struct compat_sigevent __user *u_event)
	400	{
51410d3c	401	memset(event, 0, sizeof(*event));
1da177e4 LT	402	return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) \|\|
	403	__get_user(event->sigev_value.sival_int,
	404	&u_event->sigev_value.sival_int) \|\|
	405	__get_user(event->sigev_signo, &u_event->sigev_signo) \|\|
	406	__get_user(event->sigev_notify, &u_event->sigev_notify) \|\|
	407	__get_user(event->sigev_notify_thread_id,
	408	&u_event->sigev_notify_thread_id))
	409	? -EFAULT : 0;
	410	}
	411
5fa3839a	412	long compat_get_bitmap(unsigned long mask, const compat_ulong_t __user umask,
1da177e4 LT	413	unsigned long bitmap_size)
1da177e4 LT	414	{
1da177e4 LT	415	unsigned long nr_compat_longs;
	416
	417	/* align bitmap up to nearest compat_long_t boundary */
	418	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
1e1fc133	419	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
1da177e4 LT	420
	421	if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
	422	return -EFAULT;
	423
1e1fc133 AV	424	user_access_begin();
	425	while (nr_compat_longs > 1) {
	426	compat_ulong_t l1, l2;
	427	unsafe_get_user(l1, umask++, Efault);
	428	unsafe_get_user(l2, umask++, Efault);
	429	*mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) \| l1;
	430	nr_compat_longs -= 2;
1da177e4	431	}
1e1fc133 AV	432	if (nr_compat_longs)
	433	unsafe_get_user(*mask, umask++, Efault);
	434	user_access_end();
1da177e4	435	return 0;
1e1fc133 AV	436
	437	Efault:
	438	user_access_end();
	439	return -EFAULT;
1da177e4 LT	440	}
	441
	442	long compat_put_bitmap(compat_ulong_t __user umask, unsigned long mask,
	443	unsigned long bitmap_size)
	444	{
1da177e4 LT	445	unsigned long nr_compat_longs;
	446
	447	/* align bitmap up to nearest compat_long_t boundary */
	448	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
1e1fc133	449	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
1da177e4 LT	450
	451	if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
	452	return -EFAULT;
	453
1e1fc133 AV	454	user_access_begin();
	455	while (nr_compat_longs > 1) {
	456	unsigned long m = *mask++;
	457	unsafe_put_user((compat_ulong_t)m, umask++, Efault);
	458	unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
	459	nr_compat_longs -= 2;
1da177e4	460	}
1e1fc133 AV	461	if (nr_compat_longs)
	462	unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
	463	user_access_end();
1da177e4	464	return 0;
1e1fc133 AV	465	Efault:
	466	user_access_end();
	467	return -EFAULT;
1da177e4 LT	468	}
1da177e4 LT	469
3968cf62 AV	470	int
3968cf62 AV	471	get_compat_sigset(sigset_t set, const compat_sigset_t __user compat)
1da177e4	472	{
3968cf62 AV	473	#ifdef __BIG_ENDIAN
	474	compat_sigset_t v;
	475	if (copy_from_user(&v, compat, sizeof(compat_sigset_t)))
	476	return -EFAULT;
1da177e4	477	switch (_NSIG_WORDS) {
3968cf62 AV	478	case 4: set->sig[3] = v.sig[6] \| (((long)v.sig[7]) << 32 );
	479	case 3: set->sig[2] = v.sig[4] \| (((long)v.sig[5]) << 32 );
	480	case 2: set->sig[1] = v.sig[2] \| (((long)v.sig[3]) << 32 );
	481	case 1: set->sig[0] = v.sig[0] \| (((long)v.sig[1]) << 32 );
1da177e4	482	}
3968cf62 AV	483	#else
	484	if (copy_from_user(set, compat, sizeof(compat_sigset_t)))
	485	return -EFAULT;
	486	#endif
	487	return 0;
1da177e4	488	}
3968cf62	489	EXPORT_SYMBOL_GPL(get_compat_sigset);
1da177e4	490
c41d68a5 PA	491	/*
	492	* Allocate user-space memory for the duration of a single system call,
	493	* in order to marshall parameters inside a compat thunk.
	494	*/
	495	void __user *compat_alloc_user_space(unsigned long len)
	496	{
	497	void __user *ptr;
	498
	499	/* If len would occupy more than half of the entire compat space... */
	500	if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
	501	return NULL;
	502
	503	ptr = arch_compat_alloc_user_space(len);
	504
	505	if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
	506	return NULL;
	507
	508	return ptr;
	509	}
	510	EXPORT_SYMBOL_GPL(compat_alloc_user_space);