sys/kern/sysv_ipc.c

   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) */