8a36da99de
Mainly focus on files that use BSD 2-Clause license, however the tool I was using misidentified many licenses so this was mostly a manual - error prone - task. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts.
249 lines
6.5 KiB
C
249 lines
6.5 KiB
C
/* $NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $ */
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/*-
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* SPDX-License-Identifier: BSD-4-Clause
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*
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* Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca>
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* Copyright (c) 2006 nCircle Network Security, Inc.
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* All rights reserved.
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*
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* This software was developed by Robert N. M. Watson for the TrustedBSD
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* Project under contract to nCircle Network Security, Inc.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Herb Peyerl.
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* 4. The name of Herb Peyerl may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 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 "opt_sysvipc.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sem.h>
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#include <sys/shm.h>
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#include <sys/ipc.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/ucred.h>
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void (*shmfork_hook)(struct proc *, struct proc *) = NULL;
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void (*shmexit_hook)(struct vmspace *) = NULL;
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/* called from kern_fork.c */
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void
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shmfork(p1, p2)
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struct proc *p1, *p2;
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{
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if (shmfork_hook != NULL)
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shmfork_hook(p1, p2);
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return;
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}
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/* called from kern_exit.c */
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void
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shmexit(struct vmspace *vm)
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{
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if (shmexit_hook != NULL)
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shmexit_hook(vm);
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return;
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}
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/*
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* Check for IPC permission.
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*
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* Note: The MAC Framework does not require any modifications to the
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* ipcperm() function, as access control checks are performed throughout the
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* implementation of each primitive. Those entry point calls complement the
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* ipcperm() discertionary checks. Unlike file system discretionary access
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* control, the original create of an object is given the same rights as the
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* current owner.
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*/
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int
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ipcperm(struct thread *td, struct ipc_perm *perm, int acc_mode)
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{
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struct ucred *cred = td->td_ucred;
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int error, obj_mode, dac_granted, priv_granted;
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dac_granted = 0;
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if (cred->cr_uid == perm->cuid || cred->cr_uid == perm->uid) {
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obj_mode = perm->mode;
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dac_granted |= IPC_M;
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} else if (groupmember(perm->gid, cred) ||
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groupmember(perm->cgid, cred)) {
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obj_mode = perm->mode;
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obj_mode <<= 3;
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} else {
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obj_mode = perm->mode;
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obj_mode <<= 6;
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}
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/*
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* While the System V IPC permission model allows IPC_M to be
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* granted, as part of the mode, our implementation requires
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* privilege to adminster the object if not the owner or creator.
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*/
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#if 0
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if (obj_mode & IPC_M)
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dac_granted |= IPC_M;
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#endif
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if (obj_mode & IPC_R)
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dac_granted |= IPC_R;
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if (obj_mode & IPC_W)
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dac_granted |= IPC_W;
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/*
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* Simple case: all required rights are granted by DAC.
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*/
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if ((dac_granted & acc_mode) == acc_mode)
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return (0);
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/*
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* Privilege is required to satisfy the request.
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*/
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priv_granted = 0;
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if ((acc_mode & IPC_M) && !(dac_granted & IPC_M)) {
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error = priv_check(td, PRIV_IPC_ADMIN);
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if (error == 0)
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priv_granted |= IPC_M;
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}
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if ((acc_mode & IPC_R) && !(dac_granted & IPC_R)) {
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error = priv_check(td, PRIV_IPC_READ);
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if (error == 0)
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priv_granted |= IPC_R;
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}
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if ((acc_mode & IPC_W) && !(dac_granted & IPC_W)) {
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error = priv_check(td, PRIV_IPC_WRITE);
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if (error == 0)
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priv_granted |= IPC_W;
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}
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if (((dac_granted | priv_granted) & acc_mode) == acc_mode)
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return (0);
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else
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return (EACCES);
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}
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#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
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defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
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void
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ipcperm_old2new(struct ipc_perm_old *old, struct ipc_perm *new)
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{
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new->cuid = old->cuid;
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new->cgid = old->cgid;
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new->uid = old->uid;
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new->gid = old->gid;
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new->mode = old->mode;
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new->seq = old->seq;
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new->key = old->key;
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}
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void
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ipcperm_new2old(struct ipc_perm *new, struct ipc_perm_old *old)
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{
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/* XXX: How to handle ID's > USHORT_MAX? */
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old->cuid = new->cuid;
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old->cgid = new->cgid;
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old->uid = new->uid;
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old->gid = new->gid;
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old->mode = new->mode;
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old->seq = new->seq;
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old->key = new->key;
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}
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#endif
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#ifdef COMPAT_FREEBSD32
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#include <sys/mount.h>
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#include <sys/socket.h>
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#include <compat/freebsd32/freebsd32.h>
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#include <compat/freebsd32/freebsd32_ipc.h>
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#include <compat/freebsd32/freebsd32_proto.h>
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#include <compat/freebsd32/freebsd32_signal.h>
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#include <compat/freebsd32/freebsd32_syscall.h>
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#include <compat/freebsd32/freebsd32_util.h>
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#if defined(COMPAT_FREEBSD4) || defined(COMPAT_FREEBSD5) || \
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defined(COMPAT_FREEBSD6) || defined(COMPAT_FREEBSD7)
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void
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freebsd32_ipcperm_old_in(struct ipc_perm32_old *ip32, struct ipc_perm *ip)
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{
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CP(*ip32, *ip, cuid);
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CP(*ip32, *ip, cgid);
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CP(*ip32, *ip, uid);
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CP(*ip32, *ip, gid);
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CP(*ip32, *ip, mode);
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CP(*ip32, *ip, seq);
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CP(*ip32, *ip, key);
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}
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void
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freebsd32_ipcperm_old_out(struct ipc_perm *ip, struct ipc_perm32_old *ip32)
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{
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CP(*ip, *ip32, cuid);
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CP(*ip, *ip32, cgid);
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CP(*ip, *ip32, uid);
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CP(*ip, *ip32, gid);
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CP(*ip, *ip32, mode);
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CP(*ip, *ip32, seq);
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CP(*ip, *ip32, key);
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}
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#endif
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void
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freebsd32_ipcperm_in(struct ipc_perm32 *ip32, struct ipc_perm *ip)
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{
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CP(*ip32, *ip, cuid);
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CP(*ip32, *ip, cgid);
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CP(*ip32, *ip, uid);
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CP(*ip32, *ip, gid);
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CP(*ip32, *ip, mode);
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CP(*ip32, *ip, seq);
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CP(*ip32, *ip, key);
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}
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void
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freebsd32_ipcperm_out(struct ipc_perm *ip, struct ipc_perm32 *ip32)
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{
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CP(*ip, *ip32, cuid);
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CP(*ip, *ip32, cgid);
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CP(*ip, *ip32, uid);
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CP(*ip, *ip32, gid);
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CP(*ip, *ip32, mode);
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CP(*ip, *ip32, seq);
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CP(*ip, *ip32, key);
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}
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#endif
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