1 /* $OpenBSD: sysv_ipc.c,v 1.3 1998/06/11 18:32:13 deraadt Exp $ */ 2 /* $NetBSD: sysv_ipc.c,v 1.10 1995/06/03 05:53:28 mycroft Exp $ */ 3 4 /* 5 * Copyright (c) 1995 Charles M. Hannum. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Charles M. Hannum. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 #include <sys/param.h> 34 #include <sys/kernel.h> 35 #include <sys/proc.h> 36 #include <sys/ipc.h> 37 #include <sys/systm.h> 38 #include <sys/mount.h> 39 #include <sys/vnode.h> 40 41 /* 42 * Check for ipc permission 43 */ 44 45 int 46 ipcperm(cred, perm, mode) 47 struct ucred *cred; 48 struct ipc_perm *perm; 49 int mode; 50 { 51 52 if (mode == IPC_M) { 53 if (cred->cr_uid == 0 || 54 cred->cr_uid == perm->uid || 55 cred->cr_uid == perm->cuid) 56 return (0); 57 return (EPERM); 58 } 59 60 if (vaccess(perm->mode, perm->uid, perm->gid, mode, cred) == 0 || 61 vaccess(perm->mode, perm->cuid, perm->cgid, mode, cred) == 0) 62 return (0); 63 return (EACCES); 64 } 65 66 void 67 ipc_n2o(n, o) 68 struct ipc_perm *n; 69 struct oipc_perm *o; 70 { 71 o->cuid = n->cuid; /* XXX */ 72 o->cgid = n->cgid; /* XXX */ 73 o->uid = n->uid; /* XXX */ 74 o->gid = n->gid; /* XXX */ 75 o->mode = n->mode; /* XXX */ 76 o->seq = n->seq; 77 o->key = n->key; 78 } 79 80 void 81 ipc_o2n(o, n) 82 struct oipc_perm *o; 83 struct ipc_perm *n; 84 { 85 n->cuid = o->cuid; /* XXX */ 86 n->cgid = o->cgid; /* XXX */ 87 n->uid = o->uid; /* XXX */ 88 n->gid = o->gid; /* XXX */ 89 n->mode = o->mode; /* XXX */ 90 n->seq = o->seq; 91 n->key = o->key; 92 } 93 94