b02fd8b790
if_epair used the 'params' argument to pass a pointer to the b interface through if_clone_create(). This pointer can be controlled by userspace, which means it could be abused to trigger a panic. While this requires PRIV_NET_IFCREATE privileges those are assigned to vnet jails, which means that vnet jails could panic the system. Reported by: Ilja Van Sprundel <ivansprundel@ioactive.com> MFC after: 3 days
88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1989, 1993
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* The Regents of the University of California. All rights reserved.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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* From: @(#)if.h 8.1 (Berkeley) 6/10/93
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* $FreeBSD$
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*/
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#ifndef _NET_IF_CLONE_H_
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#define _NET_IF_CLONE_H_
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#ifdef _KERNEL
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#include <sys/_eventhandler.h>
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#define IFC_NOGROUP 0x1
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struct if_clone;
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/* Methods. */
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typedef int ifc_match_t(struct if_clone *, const char *);
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typedef int ifc_create_t(struct if_clone *, char *, size_t, caddr_t);
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typedef int ifc_destroy_t(struct if_clone *, struct ifnet *);
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typedef int ifcs_create_t(struct if_clone *, int, caddr_t);
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typedef void ifcs_destroy_t(struct ifnet *);
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/* Interface cloner (de)allocating functions. */
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struct if_clone *
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if_clone_advanced(const char *, u_int, ifc_match_t, ifc_create_t,
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ifc_destroy_t);
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struct if_clone *
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if_clone_simple(const char *, ifcs_create_t, ifcs_destroy_t, u_int);
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void if_clone_detach(struct if_clone *);
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/* Unit (de)allocating fucntions. */
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int ifc_name2unit(const char *name, int *unit);
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int ifc_alloc_unit(struct if_clone *, int *);
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void ifc_free_unit(struct if_clone *, int);
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const char *ifc_name(struct if_clone *);
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void ifc_flags_set(struct if_clone *, int flags);
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int ifc_flags_get(struct if_clone *);
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/* Interface clone event. */
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typedef void (*if_clone_event_handler_t)(void *, struct if_clone *);
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EVENTHANDLER_DECLARE(if_clone_event, if_clone_event_handler_t);
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/* The below interfaces used only by net/if.c. */
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void vnet_if_clone_init(void);
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int if_clone_create(char *, size_t, caddr_t);
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int if_clone_destroy(const char *);
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int if_clone_list(struct if_clonereq *);
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struct if_clone *if_clone_findifc(struct ifnet *);
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void if_clone_addgroup(struct ifnet *, struct if_clone *);
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/* The below interfaces are used only by epair(4). */
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void if_clone_addif(struct if_clone *, struct ifnet *);
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int if_clone_destroyif(struct if_clone *, struct ifnet *);
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#endif /* _KERNEL */
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#endif /* !_NET_IF_CLONE_H_ */
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