1 /* $FreeBSD: src/sys/kern/sysv_ipc.c,v 1.13.2.2 2000/07/01 14:33:49 bsd Exp $ */ 2 /* $DragonFly: src/sys/kern/sysv_ipc.c,v 1.8 2005/10/08 14:31:26 corecode Exp $ */ 3 /* $NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $ */ 4 5 /* 6 * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca> 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. All advertising materials mentioning features or use of this software 18 * must display the following acknowledgement: 19 * This product includes software developed by Herb Peyerl. 20 * 4. The name of Herb Peyerl may not be used to endorse or promote products 21 * derived from this software without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 24 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 25 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 26 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 27 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 28 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 29 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 30 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 31 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 32 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 33 */ 34 35 #include "opt_sysvipc.h" 36 37 #include <sys/param.h> 38 #include <sys/ipc.h> 39 #include <sys/proc.h> 40 #include <sys/priv.h> 41 #include <sys/ucred.h> 42 43 #define SYSCALL_NOT_PRESENT_GEN(SC, str) \ 44 int sys_##SC (struct SC##_args *uap) \ 45 { \ 46 sysv_nosys(str); \ 47 return sys_nosys((struct nosys_args *)uap); \ 48 } 49 50 #if defined(SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG) 51 52 /* 53 * Check for ipc permission 54 */ 55 56 int 57 ipcperm(struct proc *p, struct ipc_perm *perm, int mode) 58 { 59 struct ucred *cred = p->p_ucred; 60 61 /* Check for user match. */ 62 if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) { 63 if (mode & IPC_M) 64 return (priv_check_cred(cred, PRIV_ROOT, 0) == 0 ? 0 : EPERM); 65 /* Check for group match. */ 66 mode >>= 3; 67 if (!groupmember(perm->gid, cred) && 68 !groupmember(perm->cgid, cred)) 69 /* Check for `other' match. */ 70 mode >>= 3; 71 } 72 73 if (mode & IPC_M) 74 return (0); 75 return ((mode & perm->mode) == mode || 76 priv_check_cred(cred, PRIV_ROOT, 0) == 0 ? 0 : EACCES); 77 } 78 79 #endif /* defined(SYSVSEM) || defined(SYSVSHM) || defined(SYSVMSG) */ 80 81 82 #if !defined(SYSVSEM) || !defined(SYSVSHM) || !defined(SYSVMSG) 83 84 #include <sys/proc.h> 85 #include <sys/sem.h> 86 #include <sys/shm.h> 87 #include <sys/syslog.h> 88 #include <sys/sysproto.h> 89 #include <sys/systm.h> 90 91 static void sysv_nosys (char *s); 92 93 static void 94 sysv_nosys(char *s) 95 { 96 struct thread *td = curthread; 97 struct proc *p = td->td_proc; 98 99 log(LOG_ERR, "cmd %s pid %d tried to use non-present %s\n", 100 (p ? p->p_comm : td->td_comm), 101 (p ? p->p_pid : -1), s); 102 } 103 104 #if !defined(SYSVSEM) 105 106 /* 107 * SYSVSEM stubs 108 */ 109 110 SYSCALL_NOT_PRESENT_GEN(semsys, "SYSVSEM"); 111 SYSCALL_NOT_PRESENT_GEN(__semctl, "SYSVSEM"); 112 SYSCALL_NOT_PRESENT_GEN(semget, "SYSVSEM"); 113 SYSCALL_NOT_PRESENT_GEN(semop, "SYSVSEM"); 114 115 /* called from kern_exit.c */ 116 void 117 semexit(struct proc *p) 118 { 119 /* empty */ 120 } 121 122 #endif /* !defined(SYSVSEM) */ 123 124 125 #if !defined(SYSVMSG) 126 127 /* 128 * SYSVMSG stubs 129 * 130 * note: msgsys args actually var-args? YYYY 131 */ 132 133 SYSCALL_NOT_PRESENT_GEN(msgsys, "SYSVMSG"); 134 SYSCALL_NOT_PRESENT_GEN(msgctl, "SYSVMSG"); 135 SYSCALL_NOT_PRESENT_GEN(msgget, "SYSVMSG"); 136 SYSCALL_NOT_PRESENT_GEN(msgsnd, "SYSVMSG"); 137 SYSCALL_NOT_PRESENT_GEN(msgrcv, "SYSVMSG"); 138 139 #endif /* !defined(SYSVMSG) */ 140 141 142 #if !defined(SYSVSHM) 143 144 /* 145 * SYSVSHM stubs 146 */ 147 148 SYSCALL_NOT_PRESENT_GEN(shmdt, "SYSVSHM"); 149 SYSCALL_NOT_PRESENT_GEN(shmat, "SYSVSHM"); 150 SYSCALL_NOT_PRESENT_GEN(shmctl, "SYSVSHM"); 151 SYSCALL_NOT_PRESENT_GEN(shmget, "SYSVSHM"); 152 SYSCALL_NOT_PRESENT_GEN(shmsys, "SYSVSHM"); 153 154 /* called from kern_fork.c */ 155 void 156 shmfork(struct proc *p1, struct proc *p2) 157 { 158 /* empty */ 159 } 160 161 /* called from kern_exit.c */ 162 void 163 shmexit(struct vmspace *vm) 164 { 165 /* empty */ 166 } 167 168 #endif /* !defined(SYSVSHM) */ 169 170 #endif /* !defined(SYSVSEM) || !defined(SYSVSHM) || !defined(SYSVMSG) */ 171