[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;

	memset(txc, 0, sizeof(struct timex));
	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 old_timeval32 __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 old_timeval32 __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 old_timespec32 __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 old_timespec32 __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;
}

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;
}

/*
 * 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
0a0b9873	37	memset(txc, 0, sizeof(struct timex));
3a4d44b6	38	if (copy_from_user(&tx32, utp, sizeof(struct compat_timex)))
65f5d80b RC	39	return -EFAULT;
65f5d80b RC	40
3a4d44b6 AV	41	txc->modes = tx32.modes;
	42	txc->offset = tx32.offset;
	43	txc->freq = tx32.freq;
	44	txc->maxerror = tx32.maxerror;
	45	txc->esterror = tx32.esterror;
	46	txc->status = tx32.status;
	47	txc->constant = tx32.constant;
	48	txc->precision = tx32.precision;
	49	txc->tolerance = tx32.tolerance;
	50	txc->time.tv_sec = tx32.time.tv_sec;
	51	txc->time.tv_usec = tx32.time.tv_usec;
	52	txc->tick = tx32.tick;
	53	txc->ppsfreq = tx32.ppsfreq;
	54	txc->jitter = tx32.jitter;
	55	txc->shift = tx32.shift;
	56	txc->stabil = tx32.stabil;
	57	txc->jitcnt = tx32.jitcnt;
	58	txc->calcnt = tx32.calcnt;
	59	txc->errcnt = tx32.errcnt;
	60	txc->stbcnt = tx32.stbcnt;
	61
65f5d80b RC	62	return 0;
	63	}
	64
3a4d44b6 AV	65	int compat_put_timex(struct compat_timex __user utp, const struct timex txc)
	66	{
	67	struct compat_timex tx32;
	68
	69	memset(&tx32, 0, sizeof(struct compat_timex));
	70	tx32.modes = txc->modes;
	71	tx32.offset = txc->offset;
	72	tx32.freq = txc->freq;
	73	tx32.maxerror = txc->maxerror;
	74	tx32.esterror = txc->esterror;
	75	tx32.status = txc->status;
	76	tx32.constant = txc->constant;
	77	tx32.precision = txc->precision;
	78	tx32.tolerance = txc->tolerance;
	79	tx32.time.tv_sec = txc->time.tv_sec;
	80	tx32.time.tv_usec = txc->time.tv_usec;
	81	tx32.tick = txc->tick;
	82	tx32.ppsfreq = txc->ppsfreq;
	83	tx32.jitter = txc->jitter;
	84	tx32.shift = txc->shift;
	85	tx32.stabil = txc->stabil;
	86	tx32.jitcnt = txc->jitcnt;
	87	tx32.calcnt = txc->calcnt;
	88	tx32.errcnt = txc->errcnt;
	89	tx32.stbcnt = txc->stbcnt;
	90	tx32.tai = txc->tai;
	91	if (copy_to_user(utp, &tx32, sizeof(struct compat_timex)))
65f5d80b RC	92	return -EFAULT;
	93	return 0;
	94	}
	95
9afc5eee	96	static int __compat_get_timeval(struct timeval tv, const struct old_timeval32 __user ctv)
6684ba20 PA	97	{
	98	return (!access_ok(VERIFY_READ, ctv, sizeof(*ctv)) \|\|
	99	__get_user(tv->tv_sec, &ctv->tv_sec) \|\|
	100	__get_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
	101	}
6684ba20	102
9afc5eee	103	static int __compat_put_timeval(const struct timeval tv, struct old_timeval32 __user ctv)
6684ba20 PA	104	{
	105	return (!access_ok(VERIFY_WRITE, ctv, sizeof(*ctv)) \|\|
	106	__put_user(tv->tv_sec, &ctv->tv_sec) \|\|
	107	__put_user(tv->tv_usec, &ctv->tv_usec)) ? -EFAULT : 0;
	108	}
6684ba20	109
9afc5eee	110	static int __compat_get_timespec(struct timespec ts, const struct old_timespec32 __user cts)
1da177e4 LT	111	{
	112	return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) \|\|
	113	__get_user(ts->tv_sec, &cts->tv_sec) \|\|
	114	__get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
	115	}
	116
9afc5eee	117	static int __compat_put_timespec(const struct timespec ts, struct old_timespec32 __user cts)
1da177e4 LT	118	{
	119	return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) \|\|
	120	__put_user(ts->tv_sec, &cts->tv_sec) \|\|
	121	__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;
	122	}
	123
6684ba20 PA	124	int compat_get_timeval(struct timeval tv, const void __user utv)
	125	{
	126	if (COMPAT_USE_64BIT_TIME)
6516a466	127	return copy_from_user(tv, utv, sizeof(*tv)) ? -EFAULT : 0;
6684ba20	128	else
81993e81	129	return __compat_get_timeval(tv, utv);
6684ba20 PA	130	}
	131	EXPORT_SYMBOL_GPL(compat_get_timeval);
	132
	133	int compat_put_timeval(const struct timeval tv, void __user utv)
	134	{
	135	if (COMPAT_USE_64BIT_TIME)
6516a466	136	return copy_to_user(utv, tv, sizeof(*tv)) ? -EFAULT : 0;
6684ba20	137	else
81993e81	138	return __compat_put_timeval(tv, utv);
6684ba20 PA	139	}
	140	EXPORT_SYMBOL_GPL(compat_put_timeval);
	141
	142	int compat_get_timespec(struct timespec ts, const void __user uts)
	143	{
	144	if (COMPAT_USE_64BIT_TIME)
6516a466	145	return copy_from_user(ts, uts, sizeof(*ts)) ? -EFAULT : 0;
6684ba20	146	else
81993e81	147	return __compat_get_timespec(ts, uts);
6684ba20 PA	148	}
	149	EXPORT_SYMBOL_GPL(compat_get_timespec);
	150
	151	int compat_put_timespec(const struct timespec ts, void __user uts)
	152	{
	153	if (COMPAT_USE_64BIT_TIME)
6516a466	154	return copy_to_user(uts, ts, sizeof(*ts)) ? -EFAULT : 0;
6684ba20	155	else
81993e81	156	return __compat_put_timespec(ts, uts);
6684ba20 PA	157	}
	158	EXPORT_SYMBOL_GPL(compat_put_timespec);
	159
54ad9c46	160	int get_compat_itimerval(struct itimerval o, const struct compat_itimerval __user i)
1da177e4	161	{
54ad9c46	162	struct compat_itimerval v32;
baa73d9e	163
54ad9c46 AV	164	if (copy_from_user(&v32, i, sizeof(struct compat_itimerval)))
	165	return -EFAULT;
	166	o->it_interval.tv_sec = v32.it_interval.tv_sec;
	167	o->it_interval.tv_usec = v32.it_interval.tv_usec;
	168	o->it_value.tv_sec = v32.it_value.tv_sec;
	169	o->it_value.tv_usec = v32.it_value.tv_usec;
	170	return 0;
1da177e4 LT	171	}
1da177e4 LT	172
54ad9c46	173	int put_compat_itimerval(struct compat_itimerval __user o, const struct itimerval i)
1da177e4	174	{
54ad9c46	175	struct compat_itimerval v32;
1da177e4	176
54ad9c46 AV	177	v32.it_interval.tv_sec = i->it_interval.tv_sec;
	178	v32.it_interval.tv_usec = i->it_interval.tv_usec;
	179	v32.it_value.tv_sec = i->it_value.tv_sec;
	180	v32.it_value.tv_usec = i->it_value.tv_usec;
	181	return copy_to_user(o, &v32, sizeof(struct compat_itimerval)) ? -EFAULT : 0;
1da177e4 LT	182	}
1da177e4 LT	183
be84cb43 CM	184	#ifdef __ARCH_WANT_SYS_SIGPROCMASK
be84cb43 CM	185
b7dafa0e JK	186	/*
	187	* sys_sigprocmask SIG_SETMASK sets the first (compat) word of the
	188	* blocked set of signals to the supplied signal set
	189	*/
	190	static inline void compat_sig_setmask(sigset_t *blocked, compat_sigset_word set)
1da177e4	191	{
b7dafa0e JK	192	memcpy(blocked->sig, &set, sizeof(set));
b7dafa0e JK	193	}
1da177e4	194
5cf22100 AV	195	COMPAT_SYSCALL_DEFINE3(sigprocmask, int, how,
	196	compat_old_sigset_t __user *, nset,
	197	compat_old_sigset_t __user *, oset)
b7dafa0e JK	198	{
	199	old_sigset_t old_set, new_set;
	200	sigset_t new_blocked;
	201
	202	old_set = current->blocked.sig[0];
	203
	204	if (nset) {
	205	if (get_user(new_set, nset))
	206	return -EFAULT;
	207	new_set &= ~(sigmask(SIGKILL) \| sigmask(SIGSTOP));
	208
	209	new_blocked = current->blocked;
	210
	211	switch (how) {
	212	case SIG_BLOCK:
	213	sigaddsetmask(&new_blocked, new_set);
	214	break;
	215	case SIG_UNBLOCK:
	216	sigdelsetmask(&new_blocked, new_set);
	217	break;
	218	case SIG_SETMASK:
	219	compat_sig_setmask(&new_blocked, new_set);
	220	break;
	221	default:
	222	return -EINVAL;
	223	}
	224
	225	set_current_blocked(&new_blocked);
	226	}
	227
	228	if (oset) {
	229	if (put_user(old_set, oset))
	230	return -EFAULT;
	231	}
	232
	233	return 0;
1da177e4 LT	234	}
1da177e4 LT	235
be84cb43 CM	236	#endif
be84cb43 CM	237
1da177e4 LT	238	int put_compat_rusage(const struct rusage r, struct compat_rusage __user ru)
1da177e4 LT	239	{
7668b679 AV	240	struct compat_rusage r32;
	241	memset(&r32, 0, sizeof(r32));
	242	r32.ru_utime.tv_sec = r->ru_utime.tv_sec;
	243	r32.ru_utime.tv_usec = r->ru_utime.tv_usec;
	244	r32.ru_stime.tv_sec = r->ru_stime.tv_sec;
	245	r32.ru_stime.tv_usec = r->ru_stime.tv_usec;
	246	r32.ru_maxrss = r->ru_maxrss;
	247	r32.ru_ixrss = r->ru_ixrss;
	248	r32.ru_idrss = r->ru_idrss;
	249	r32.ru_isrss = r->ru_isrss;
	250	r32.ru_minflt = r->ru_minflt;
	251	r32.ru_majflt = r->ru_majflt;
	252	r32.ru_nswap = r->ru_nswap;
	253	r32.ru_inblock = r->ru_inblock;
	254	r32.ru_oublock = r->ru_oublock;
	255	r32.ru_msgsnd = r->ru_msgsnd;
	256	r32.ru_msgrcv = r->ru_msgrcv;
	257	r32.ru_nsignals = r->ru_nsignals;
	258	r32.ru_nvcsw = r->ru_nvcsw;
	259	r32.ru_nivcsw = r->ru_nivcsw;
	260	if (copy_to_user(ru, &r32, sizeof(r32)))
1da177e4 LT	261	return -EFAULT;
	262	return 0;
	263	}
	264
1da177e4	265	static int compat_get_user_cpu_mask(compat_ulong_t __user *user_mask_ptr,
a45185d2	266	unsigned len, struct cpumask *new_mask)
1da177e4 LT	267	{
	268	unsigned long *k;
	269
a45185d2 RR	270	if (len < cpumask_size())
	271	memset(new_mask, 0, cpumask_size());
	272	else if (len > cpumask_size())
	273	len = cpumask_size();
1da177e4	274
a45185d2	275	k = cpumask_bits(new_mask);
1da177e4 LT	276	return compat_get_bitmap(k, user_mask_ptr, len * 8);
	277	}
	278
62a6fa97 HC	279	COMPAT_SYSCALL_DEFINE3(sched_setaffinity, compat_pid_t, pid,
	280	unsigned int, len,
	281	compat_ulong_t __user *, user_mask_ptr)
1da177e4	282	{
a45185d2	283	cpumask_var_t new_mask;
1da177e4 LT	284	int retval;
1da177e4 LT	285
a45185d2 RR	286	if (!alloc_cpumask_var(&new_mask, GFP_KERNEL))
	287	return -ENOMEM;
	288
	289	retval = compat_get_user_cpu_mask(user_mask_ptr, len, new_mask);
1da177e4	290	if (retval)
a45185d2	291	goto out;
1da177e4	292
a45185d2 RR	293	retval = sched_setaffinity(pid, new_mask);
	294	out:
	295	free_cpumask_var(new_mask);
	296	return retval;
1da177e4 LT	297	}
1da177e4 LT	298
62a6fa97 HC	299	COMPAT_SYSCALL_DEFINE3(sched_getaffinity, compat_pid_t, pid, unsigned int, len,
62a6fa97 HC	300	compat_ulong_t __user *, user_mask_ptr)
1da177e4 LT	301	{
1da177e4 LT	302	int ret;
a45185d2	303	cpumask_var_t mask;
1da177e4	304
fa9dc265 KM	305	if ((len * BITS_PER_BYTE) < nr_cpu_ids)
	306	return -EINVAL;
	307	if (len & (sizeof(compat_ulong_t)-1))
1da177e4 LT	308	return -EINVAL;
1da177e4 LT	309
a45185d2 RR	310	if (!alloc_cpumask_var(&mask, GFP_KERNEL))
	311	return -ENOMEM;
	312
	313	ret = sched_getaffinity(pid, mask);
fa9dc265	314	if (ret == 0) {
4de373a1	315	unsigned int retlen = min(len, cpumask_size());
1da177e4	316
fa9dc265 KM	317	if (compat_put_bitmap(user_mask_ptr, cpumask_bits(mask), retlen * 8))
	318	ret = -EFAULT;
	319	else
	320	ret = retlen;
	321	}
a45185d2	322	free_cpumask_var(mask);
fa9dc265	323
a45185d2	324	return ret;
1da177e4 LT	325	}
1da177e4 LT	326
1da177e4 LT	327	/*
	328	* We currently only need the following fields from the sigevent
	329	* structure: sigev_value, sigev_signo, sig_notify and (sometimes
	330	* sigev_notify_thread_id). The others are handled in user mode.
	331	* We also assume that copying sigev_value.sival_int is sufficient
	332	* to keep all the bits of sigev_value.sival_ptr intact.
	333	*/
	334	int get_compat_sigevent(struct sigevent *event,
	335	const struct compat_sigevent __user *u_event)
	336	{
51410d3c	337	memset(event, 0, sizeof(*event));
1da177e4 LT	338	return (!access_ok(VERIFY_READ, u_event, sizeof(*u_event)) \|\|
	339	__get_user(event->sigev_value.sival_int,
	340	&u_event->sigev_value.sival_int) \|\|
	341	__get_user(event->sigev_signo, &u_event->sigev_signo) \|\|
	342	__get_user(event->sigev_notify, &u_event->sigev_notify) \|\|
	343	__get_user(event->sigev_notify_thread_id,
	344	&u_event->sigev_notify_thread_id))
	345	? -EFAULT : 0;
	346	}
	347
5fa3839a	348	long compat_get_bitmap(unsigned long mask, const compat_ulong_t __user umask,
1da177e4 LT	349	unsigned long bitmap_size)
1da177e4 LT	350	{
1da177e4 LT	351	unsigned long nr_compat_longs;
	352
	353	/* align bitmap up to nearest compat_long_t boundary */
	354	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
1e1fc133	355	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
1da177e4 LT	356
	357	if (!access_ok(VERIFY_READ, umask, bitmap_size / 8))
	358	return -EFAULT;
	359
1e1fc133 AV	360	user_access_begin();
	361	while (nr_compat_longs > 1) {
	362	compat_ulong_t l1, l2;
	363	unsafe_get_user(l1, umask++, Efault);
	364	unsafe_get_user(l2, umask++, Efault);
	365	*mask++ = ((unsigned long)l2 << BITS_PER_COMPAT_LONG) \| l1;
	366	nr_compat_longs -= 2;
1da177e4	367	}
1e1fc133 AV	368	if (nr_compat_longs)
	369	unsafe_get_user(*mask, umask++, Efault);
	370	user_access_end();
1da177e4	371	return 0;
1e1fc133 AV	372
	373	Efault:
	374	user_access_end();
	375	return -EFAULT;
1da177e4 LT	376	}
	377
	378	long compat_put_bitmap(compat_ulong_t __user umask, unsigned long mask,
	379	unsigned long bitmap_size)
	380	{
1da177e4 LT	381	unsigned long nr_compat_longs;
	382
	383	/* align bitmap up to nearest compat_long_t boundary */
	384	bitmap_size = ALIGN(bitmap_size, BITS_PER_COMPAT_LONG);
1e1fc133	385	nr_compat_longs = BITS_TO_COMPAT_LONGS(bitmap_size);
1da177e4 LT	386
	387	if (!access_ok(VERIFY_WRITE, umask, bitmap_size / 8))
	388	return -EFAULT;
	389
1e1fc133 AV	390	user_access_begin();
	391	while (nr_compat_longs > 1) {
	392	unsigned long m = *mask++;
	393	unsafe_put_user((compat_ulong_t)m, umask++, Efault);
	394	unsafe_put_user(m >> BITS_PER_COMPAT_LONG, umask++, Efault);
	395	nr_compat_longs -= 2;
1da177e4	396	}
1e1fc133 AV	397	if (nr_compat_longs)
	398	unsafe_put_user((compat_ulong_t)*mask, umask++, Efault);
	399	user_access_end();
1da177e4	400	return 0;
1e1fc133 AV	401	Efault:
	402	user_access_end();
	403	return -EFAULT;
1da177e4 LT	404	}
1da177e4 LT	405
3968cf62 AV	406	int
3968cf62 AV	407	get_compat_sigset(sigset_t set, const compat_sigset_t __user compat)
1da177e4	408	{
3968cf62 AV	409	#ifdef __BIG_ENDIAN
	410	compat_sigset_t v;
	411	if (copy_from_user(&v, compat, sizeof(compat_sigset_t)))
	412	return -EFAULT;
1da177e4	413	switch (_NSIG_WORDS) {
3968cf62 AV	414	case 4: set->sig[3] = v.sig[6] \| (((long)v.sig[7]) << 32 );
	415	case 3: set->sig[2] = v.sig[4] \| (((long)v.sig[5]) << 32 );
	416	case 2: set->sig[1] = v.sig[2] \| (((long)v.sig[3]) << 32 );
	417	case 1: set->sig[0] = v.sig[0] \| (((long)v.sig[1]) << 32 );
1da177e4	418	}
3968cf62 AV	419	#else
	420	if (copy_from_user(set, compat, sizeof(compat_sigset_t)))
	421	return -EFAULT;
	422	#endif
	423	return 0;
1da177e4	424	}
3968cf62	425	EXPORT_SYMBOL_GPL(get_compat_sigset);
1da177e4	426
c41d68a5 PA	427	/*
	428	* Allocate user-space memory for the duration of a single system call,
	429	* in order to marshall parameters inside a compat thunk.
	430	*/
	431	void __user *compat_alloc_user_space(unsigned long len)
	432	{
	433	void __user *ptr;
	434
	435	/* If len would occupy more than half of the entire compat space... */
	436	if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
	437	return NULL;
	438
	439	ptr = arch_compat_alloc_user_space(len);
	440
	441	if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
	442	return NULL;
	443
	444	return ptr;
	445	}
	446	EXPORT_SYMBOL_GPL(compat_alloc_user_space);