1 /* $FreeBSD$ */ 2 /* $NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $ */ 3 4 /* 5 * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by Herb Peyerl. 19 * 4. The name of Herb Peyerl may not be used to endorse or promote products 20 * derived from this software without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 25 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 27 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 31 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 #include "opt_sysvipc.h" 35 36 #include <sys/param.h> 37 #include <sys/systm.h> 38 #include <sys/sem.h> 39 #include <sys/shm.h> 40 #include <sys/ipc.h> 41 #include <sys/proc.h> 42 #include <sys/ucred.h> 43 44 void (*semexit_hook)(struct proc *) = NULL; 45 void (*shmfork_hook)(struct proc *, struct proc *) = NULL; 46 void (*shmexit_hook)(struct proc *) = NULL; 47 48 /* called from kern_exit.c */ 49 void 50 semexit(p) 51 struct proc *p; 52 { 53 54 if (semexit_hook != NULL) 55 semexit_hook(p); 56 return; 57 } 58 59 /* called from kern_fork.c */ 60 void 61 shmfork(p1, p2) 62 struct proc *p1, *p2; 63 { 64 65 if (shmfork_hook != NULL) 66 shmfork_hook(p1, p2); 67 return; 68 } 69 70 /* called from kern_exit.c */ 71 void 72 shmexit(p) 73 struct proc *p; 74 { 75 76 if (shmexit_hook != NULL) 77 shmexit_hook(p); 78 return; 79 } 80 81 /* 82 * Check for ipc permission 83 */ 84 85 int 86 ipcperm(p, perm, mode) 87 struct proc *p; 88 struct ipc_perm *perm; 89 int mode; 90 { 91 struct ucred *cred = p->p_ucred; 92 93 /* Check for user match. */ 94 if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) { 95 if (mode & IPC_M) 96 return (suser(p) == 0 ? 0 : EPERM); 97 /* Check for group match. */ 98 mode >>= 3; 99 if (!groupmember(perm->gid, cred) && 100 !groupmember(perm->cgid, cred)) 101 /* Check for `other' match. */ 102 mode >>= 3; 103 } 104 105 if (mode & IPC_M) 106 return (0); 107 return ((mode & perm->mode) == mode || suser(p) == 0 ? 0 : EACCES); 108 } 109