/* *  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/migrate.h>#include <linux/posix-timers.h>#include <linux/times.h>#include <linux/ptrace.h>#include <linux/gfp.h> #include <asm/uaccess.h> /* * Note that the native side is already converted to a timespec, because * that's what we want anyway. */static int compat_get_timeval(struct timespec *o,		struct compat_timeval __user *i){	long usec; 	if (get_user(o->tv_sec, &i->tv_sec) ||	    get_user(usec, &i->tv_usec))		return -EFAULT;	o->tv_nsec = usec * 1000;	return 0;} static int compat_put_timeval(struct compat_timeval __user *o,		struct timeval *i){	return (put_user(i->tv_sec, &o->tv_sec) ||		put_user(i->tv_usec, &o->tv_usec)) ? -EFAULT : 0;} static int compat_get_timex(struct timex *txc, struct compat_timex __user *utp){	memset(txc, 0, sizeof(struct timex)); 	if (!access_ok(VERIFY_READ, utp, sizeof(struct compat_timex)) ||			__get_user(txc->modes, &utp->modes) ||			__get_user(txc->offset, &utp->offset) ||			__get_user(txc->freq, &utp->freq) ||			__get_user(txc->maxerror, &utp->maxerror) ||			__get_user(txc->esterror, &utp->esterror) ||			__get_user(txc->status, &utp->status) ||			__get_user(txc->constant, &utp->constant) ||			__get_user(txc->precision, &utp->precision) ||			__get_user(txc->tolerance, &utp->tolerance) ||			__get_user(txc->time.tv_sec, &utp->time.tv_sec) ||			__get_user(txc->time.tv_usec, &utp->time.tv_usec) ||			__get_user(txc->tick, &utp->tick) ||			__get_user(txc->ppsfreq, &utp->ppsfreq) ||			__get_user(txc->jitter, &utp->jitter) ||			__get_user(txc->shift, &utp->shift) ||			__get_user(txc->stabil, &utp->stabil) ||			__get_user(txc->jitcnt, &utp->jitcnt) ||			__get_user(txc->calcnt, &utp->calcnt) ||			__get_user(txc->errcnt, &utp->errcnt) ||			__get_user(txc->stbcnt, &utp->stbcnt))		return -EFAULT; 	return 0;} static int compat_put_timex(struct compat_timex __user *utp, struct timex *txc){	if (!access_ok(VERIFY_WRITE, utp, sizeof(struct compat_timex)) ||			__put_user(txc->modes, &utp->modes) ||			__put_user(txc->offset, &utp->offset) ||			__put_user(txc->freq, &utp->freq) ||			__put_user(txc->maxerror, &utp->maxerror) ||			__put_user(txc->esterror, &utp->esterror) ||			__put_user(txc->status, &utp->status) ||			__put_user(txc->constant, &utp->constant) ||			__put_user(txc->precision, &utp->precision) ||			__put_user(txc->tolerance, &utp->tolerance) ||			__put_user(txc->time.tv_sec, &utp->time.tv_sec) ||			__put_user(txc->time.tv_usec, &utp->time.tv_usec) ||			__put_user(txc->tick, &utp->tick) ||			__put_user(txc->ppsfreq, &utp->ppsfreq) ||			__put_user(txc->jitter, &utp->jitter) ||			__put_user(txc->shift, &utp->shift) ||			__put_user(txc->stabil, &utp->stabil) ||			__put_user(txc->jitcnt, &utp->jitcnt) ||			__put_user(txc->calcnt, &utp->calcnt) ||			__put_user(txc->errcnt, &utp->errcnt) ||			__put_user(txc->stbcnt, &utp->stbcnt) ||			__put_user(txc->tai, &utp->tai))		return -EFAULT;	return 0;} asmlinkage long compat_sys_gettimeofday(struct compat_timeval __user *tv,		struct timezone __user *tz){	if (tv) {		struct timeval ktv;		do_gettimeofday(&ktv);		if (compat_put_timeval(tv, &ktv))			return -EFAULT;	}	if (tz) {		if (copy_to_user(tz, &sys_tz, sizeof(sys_tz)))			return -EFAULT;	} 	return 0;} asmlinkage long compat_sys_settimeofday(struct compat_timeval __user *tv,		struct timezone __user *tz){	struct timespec kts;	struct timezone ktz; 	if (tv) {		if (compat_get_timeval(&kts, tv))			return -EFAULT;	}	if (tz) {		if (copy_from_user(&ktz, tz, sizeof(ktz)))			return -EFAULT;	} 	return do_sys_settimeofday(tv ? &kts : NULL, tz ? &ktz : NULL);} int get_compat_timespec(struct timespec *ts, const struct compat_timespec __user *cts){	return (!access_ok(VERIFY_READ, cts, sizeof(*cts)) ||			__get_user(ts->tv_sec, &cts->tv_sec) ||			__get_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;} int put_compat_timespec(const struct timespec *ts, struct compat_timespec __user *cts){	return (!access_ok(VERIFY_WRITE, cts, sizeof(*cts)) ||			__put_user(ts->tv_sec, &cts->tv_sec) ||			__put_user(ts->tv_nsec, &cts->tv_nsec)) ? -EFAULT : 0;} static long compat_nanosleep_restart(struct restart_block *restart){	struct compat_timespec __user *rmtp;	struct timespec rmt;	mm_segment_t oldfs;	long ret; 	restart->nanosleep.rmtp = (struct timespec __user *) &rmt;	oldfs = get_fs();	set_fs(KERNEL_DS);	ret = hrtimer_nanosleep_restart(restart);	set_fs(oldfs); 	if (ret) {		rmtp = restart->nanosleep.compat_rmtp; 		if (rmtp && put_compat_timespec(&rmt, rmtp))			return -EFAULT;	} 	return ret;} asmlinkage long compat_sys_nanosleep(struct compat_timespec __user *rqtp,				     struct compat_timespec __user *rmtp){	struct timespec tu, rmt;	mm_segment_t oldfs;	long ret; 	if (get_compat_timespec(&tu, rqtp))		return -EFAULT; 	if (!timespec_valid(&tu))		return -EINVAL; 	oldfs = get_fs();	set_fs(KERNEL_DS);	ret = hrtimer_nanosleep(&tu,				rmtp ? (struct timespec __user *)&rmt : NULL,				HRTIMER_MODE_REL, CLOCK_MONOTONIC);	set_fs(oldfs); 	if (ret) {		struct restart_block *restart			= &current_thread_info()->restart_block; 		restart->fn = compat_nanosleep_restart;		restart->nanosleep.compat_rmtp = rmtp; 		if (rmtp && put_compat_timespec(&rmt, rmtp))			return -EFAULT;	} 	return ret;} static inline long get_compat_itimerval(struct itimerval *o,		struct compat_itimerval __user *i){	return (!access_ok(VERIFY_READ, i, sizeof(*i)) ||		(__get_user(o->it_interval.tv_sec, &i->it_interval.tv_sec) |		 __get_user(o->it_interval.tv_usec, &i->it_interval.tv_usec) |		 __get_user(o->it_value.tv_sec, &i->it_value.tv_sec) |		 __get_user(o->it_value.tv_usec, &i->it_value.tv_usec)));} static inline long put_compat_itimerval(struct compat_itimerval __user *o,		struct itimerval *i){	return (!access_ok(VERIFY_WRITE, o, sizeof(*o)) ||		(__put_user(i->it_interval.tv_sec, &o->it_interval.tv_sec) |		 __put_user(i->it_interval.tv_usec, &o->it_interval.tv_usec) |		 __put_user(i->it_value.tv_sec, &o->it_value.tv_sec) |		 __put_user(i->it_value.tv_usec, &o->it_value.tv_usec)));} asmlinkage long compat_sys_getitimer(int which,		struct compat_itimerval __user *it){	struct itimerval kit;	int error; 	error = do_getitimer(which, &kit);	if (!error && put_compat_itimerval(it, &kit))		error = -EFAULT;	return error;} asmlinkage long compat_sys_setitimer(int which,		struct compat_itimerval __user *in,		struct compat_itimerval __user *out){	struct itimerval kin, kout;	int error; 	if (in) {		if (get_compat_itimerval(&kin, in))			return -EFAULT;	} else		memset(&kin, 0, sizeof(kin)); 	error = do_setitimer(which, &kin, out ? &kout : NULL);	if (error || !out)		return error;	if (put_compat_itimerval(out, &kout))		return -EFAULT;	return 0;} static compat_clock_t clock_t_to_compat_clock_t(clock_t x){	return compat_jiffies_to_clock_t(clock_t_to_jiffies(x));} asmlinkage long compat_sys_times(struct compat_tms __user *tbuf){	if (tbuf) {		struct tms tms;		struct compat_tms tmp; 		do_sys_times(&tms);		/* Convert our struct tms to the compat version. */		tmp.tms_utime = clock_t_to_compat_clock_t(tms.tms_utime);		tmp.tms_stime = clock_t_to_compat_clock_t(tms.tms_stime);		tmp.tms_cutime = clock_t_to_compat_clock_t(tms.tms_cutime);		tmp.tms_cstime = clock_t_to_compat_clock_t(tms.tms_cstime);		if (copy_to_user(tbuf, &tmp, sizeof(tmp)))			return -EFAULT;	}	force_successful_syscall_return();	return compat_jiffies_to_clock_t(jiffies);} /* * Assumption: old_sigset_t and compat_old_sigset_t are both * types that can be passed to put_user()/get_user(). */ asmlinkage long compat_sys_sigpending(compat_old_sigset_t __user *set){	old_sigset_t s;	long ret;	mm_segment_t old_fs = get_fs(); 	set_fs(KERNEL_DS);	ret = sys_sigpending((old_sigset_t __user *) &s);	set_fs(old_fs);	if (ret == 0)		ret = put_user(s, set);	return ret;} asmlinkage long compat_sys_sigprocmask(int how, compat_old_sigset_t __user *set,		compat_old_sigset_t __user *oset){	old_sigset_t s;	long ret;	mm_segment_t old_fs; 	if (set && get_user(s, set))		return -EFAULT;	old_fs = get_fs();	set_fs(KERNEL_DS);	ret = sys_sigprocmask(how,			      set ? (old_sigset_t __user *) &s : NULL,			      oset ? (old_sigset_t __user *) &s : NULL);	set_fs(old_fs);	if (ret == 0)		if (oset)			ret = put_user(s, oset);	return ret;} asmlinkage long compat_sys_setrlimit(unsigned int resource,		struct compat_rlimit __user *rlim){	struct rlimit r; 	if (!access_ok(VERIFY_READ, rlim, sizeof(*rlim)) ||	    __get_user(r.rlim_cur, &rlim->rlim_cur) ||	    __get_user(r.rlim_max, &rlim->rlim_max))		return -EFAULT; 	if (r.rlim_cur == COMPAT_RLIM_INFINITY)		r.rlim_cur = RLIM_INFINITY;	if (r.rlim_max == COMPAT_RLIM_INFINITY)		r.rlim_max = RLIM_INFINITY;	return do_prlimit(current, resource, &r, NULL);} #ifdef COMPAT_RLIM_OLD_INFINITY asmlinkage long compat_sys_old_getrlimit(unsigned int resource,		struct compat_rlimit __user *rlim){	struct rlimit r;	int ret;	mm_segment_t old_fs = get_fs(); 	set_fs(KERNEL_DS);	ret = sys_old_getrlimit(resource, &r);	set_fs(old_fs); 	if (!ret) {		if (r.rlim_cur > COMPAT_RLIM_OLD_INFINITY)			r.rlim_cur = COMPAT_RLIM_INFINITY;		if (r.rlim_max > COMPAT_RLIM_OLD_INFINITY)			r.rlim_max = COMPAT_RLIM_INFINITY; 		if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||		    __put_user(r.rlim_cur, &rlim->rlim_cur) ||		    __put_user(r.rlim_max, &rlim->rlim_max))			return -EFAULT;	}	return ret;} #endif asmlinkage long compat_sys_getrlimit(unsigned int resource,		struct compat_rlimit __user *rlim){	struct rlimit r;	int ret; 	ret = do_prlimit(current, resource, NULL, &r);	if (!ret) {		if (r.rlim_cur > COMPAT_RLIM_INFINITY)			r.rlim_cur = COMPAT_RLIM_INFINITY;		if (r.rlim_max > COMPAT_RLIM_INFINITY)			r.rlim_max = COMPAT_RLIM_INFINITY; 		if (!access_ok(VERIFY_WRITE, rlim, sizeof(*rlim)) ||		    __put_user(r.rlim_cur, &rlim->rlim_cur) ||		    __put_user(r.rlim_max, &rlim->rlim_max))			return -EFAULT;	}	return ret;} int put_compat_rusage(const struct rusage *r, struct compat_rusage __user *ru){	if (!access_ok(VERIFY_WRITE, ru, sizeof(*ru)) ||	    __put_user(r->ru_utime.tv_sec, &ru->ru_utime.tv_sec) ||	    __put_user(r->ru_utime.tv_usec, &ru->ru_utime.tv_usec) ||	    __put_user(r->ru_stime.tv_sec, &ru->ru_stime.tv_sec) ||	    __put_user(r->ru_stime.tv_usec, &ru->ru_stime.tv_usec) ||	    __put_user(r->ru_maxrss, &ru->ru_maxrss) ||	    __put_user(r->ru_ixrss, &ru->ru_ixrss) ||	    __put_user(r->ru_idrss, &ru->ru_idrss) ||	    __put_user(r->ru_isrss, &ru->ru_isrss) ||	    __put_user(r->ru_minflt, &ru->ru_minflt) ||	    __put_user(r->ru_majflt, &ru->ru_majflt) ||	    __put_user(r->ru_nswap, &ru->ru_nswap) ||	    __put_user(r->ru_inblock, &ru->ru_inblock) ||	    __put_user(r->ru_oublock, &ru->ru_oublock) ||	    __put_user(r->ru_msgsnd, &ru->ru_msgsnd) ||	    __put_user(r->ru_msgrcv, &ru->ru_msgrcv) ||	    __put_user(r->ru_nsignals, &ru->ru_nsignals) ||	    __put_user(r->ru_nvcsw, &ru->ru_nvcsw) ||	    __put_user(r->ru_nivcsw, &ru->ru_nivcsw))		return -EFAULT;	return 0;} asmlinkage long compat_sys_getrusage(int who, struct compat_rusage __user *ru){	struct rusage r;	int ret;	mm_segment_t old_fs = get_fs(); 	set_fs(KERNEL_DS);	ret = sys_getrusage(who, (struct rusage __user *) &r);	set_fs(old_fs); 	if (ret)		return ret; 	if (put_compat_rusage(&r, ru))		return -EFAULT; 	return 0;} asmlinkage longcompat_sys_wait4(compat_pid_t pid, compat_uint_t __user *stat_addr, int options,	struct compat_rusage __user *ru){	if (!ru) {		return sys_wait4(pid, stat_addr, options, NULL);	} else {		struct rusage r;		int ret;		unsigned int status;		mm_segment_t old_fs = get_fs(); 		set_fs (KERNEL_DS);		ret = sys_wait4(pid,				(stat_addr ?				 (unsigned int __user *) &status : NULL),				options, (struct rusage __user *) &r);		set_fs (old_fs); 		if (ret > 0) {			if (put_compat_rusage(&r, ru))				return -EFAULT;			if (stat_addr && put_user(status, stat_addr))				return -EFAULT;		}		return ret;	}} asmlinkage long compat_sys_waitid(int which, compat_pid_t pid,		struct compat_siginfo __user *uinfo, int options,		struct compat_rusage __user *uru){	siginfo_t info;	struct rusage ru;	long ret;	mm_segment_t old_fs = get_fs(); 	memset(&info, 0, sizeof(info)); 	set_fs(KERNEL_DS);	ret = sys_waitid(which, pid, (siginfo_t __user *)&info, options,			 uru ? (struct rusage __user *)&ru : NULL);	set_fs(old_fs); 	if ((ret < 0) || (info.si_signo == 0))		return ret; 	if (uru) {		ret = put_compat_rusage(&ru, uru);		if (ret)			return ret;	} 

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