a42a93a102
Use proper method to access userspace. For now, only the slow copyout path is implemented. Reported and tested by: tijl (previous version) Sponsored by: The FreeBSD Foundation
179 lines
4.1 KiB
C
179 lines
4.1 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2018 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Konstantin Belousov <kib@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_compat.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/imgact.h>
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#include <sys/lock.h>
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#include <sys/sx.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/vm_extern.h>
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#include <vm/pmap.h>
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#include <machine/atomic.h>
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#include <machine/md_var.h>
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#include <compat/linux/linux_emul.h>
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#include <compat/linux/linux_futex.h>
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struct futex_st0 {
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int oparg;
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int *oldval;
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};
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static void
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futex_xchgl_slow0(vm_offset_t kva, void *arg)
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{
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struct futex_st0 *st;
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st = arg;
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*st->oldval = atomic_swap_int((int *)kva, st->oparg);
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}
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int
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futex_xchgl(int oparg, uint32_t *uaddr, int *oldval)
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{
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struct futex_st0 st;
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st.oparg = oparg;
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st.oldval = oldval;
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if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
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futex_xchgl_slow0, &st) != 0)
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return (-EFAULT);
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return (0);
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}
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static void
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futex_addl_slow0(vm_offset_t kva, void *arg)
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{
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struct futex_st0 *st;
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st = arg;
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*st->oldval = atomic_fetchadd_int((int *)kva, st->oparg);
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}
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int
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futex_addl(int oparg, uint32_t *uaddr, int *oldval)
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{
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struct futex_st0 st;
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st.oparg = oparg;
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st.oldval = oldval;
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if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
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futex_addl_slow0, &st) != 0)
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return (-EFAULT);
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return (0);
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}
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static void
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futex_orl_slow0(vm_offset_t kva, void *arg)
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{
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struct futex_st0 *st;
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int old;
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st = arg;
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old = *(int *)kva;
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while (!atomic_fcmpset_int((int *)kva, &old, old | st->oparg))
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;
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*st->oldval = old;
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}
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int
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futex_orl(int oparg, uint32_t *uaddr, int *oldval)
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{
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struct futex_st0 st;
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st.oparg = oparg;
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st.oldval = oldval;
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if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
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futex_orl_slow0, &st) != 0)
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return (-EFAULT);
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return (0);
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}
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static void
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futex_andl_slow0(vm_offset_t kva, void *arg)
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{
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struct futex_st0 *st;
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int old;
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st = arg;
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old = *(int *)kva;
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while (!atomic_fcmpset_int((int *)kva, &old, old & st->oparg))
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;
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*st->oldval = old;
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}
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int
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futex_andl(int oparg, uint32_t *uaddr, int *oldval)
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{
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struct futex_st0 st;
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st.oparg = oparg;
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st.oldval = oldval;
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if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
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futex_andl_slow0, &st) != 0)
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return (-EFAULT);
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return (0);
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}
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static void
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futex_xorl_slow0(vm_offset_t kva, void *arg)
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{
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struct futex_st0 *st;
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int old;
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st = arg;
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old = *(int *)kva;
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while (!atomic_fcmpset_int((int *)kva, &old, old ^ st->oparg))
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;
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*st->oldval = old;
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}
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int
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futex_xorl(int oparg, uint32_t *uaddr, int *oldval)
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{
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struct futex_st0 st;
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st.oparg = oparg;
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st.oldval = oldval;
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if (cp_slow0((vm_offset_t)uaddr, sizeof(uint32_t), true,
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futex_xorl_slow0, &st) != 0)
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return (-EFAULT);
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return (0);
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}
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