/* *  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) {		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;} voidsigset_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

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