litmus-rt.git - The LITMUS^RT kernel.

The LITMUS^RT kernel.

Bjoern Brandenburg

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author	Igor Mammedov <imammedo@redhat.com>	2014-12-01 12:29:24 -0500
committer	Paolo Bonzini <pbonzini@redhat.com>	2014-12-04 09:29:09 -0500
commit	7f379cff11fb9e00e0ff9eff8fbc39ddfd4b1bec (patch)
tree	1d6d8facc9b31c5c34bf1cd161b5da5c8b7282ae /include
parent	5a38b6e6b41b4819516e13770ec02b7f0e622a57 (diff)

kvm: update_memslots: drop not needed check for the same slot

UP/DOWN shift loops will shift array in needed direction and stop at place where new slot should be placed regardless of old slot size. Signed-off-by: Igor Mammedov <imammedo@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

Diffstat (limited to 'include')

0 files changed, 0 insertions, 0 deletions

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/*
 *  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 <asm/uaccess.h>

/*
 * Get/set struct timeval with struct timespec on the native side
 */
static int compat_get_timeval_convert(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_convert(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_convert(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_convert(&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_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;
}
EXPORT_SYMBOL_GPL(get_compat_timeval);

int put_compat_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;
}
EXPORT_SYMBOL_GPL(put_compat_timeval);

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;
}
EXPORT_SYMBOL_GPL(get_compat_timespec);

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;
}
EXPORT_SYMBOL_GPL(put_compat_timespec);

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 get_compat_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 put_compat_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 get_compat_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 put_compat_timespec(ts, uts);
}
EXPORT_SYMBOL_GPL(compat_put_timespec);

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)));
}

COMPAT_SYSCALL_DEFINE2(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;
}

COMPAT_SYSCALL_DEFINE3(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);
}

#ifdef __ARCH_WANT_SYS_SIGPENDING

/*
 * 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;
}

#endif

#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

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) ||


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