sysv_ipc.c

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    1 /* $FreeBSD: releng/5.1/sys/kern/sysv_ipc.c 109205 2003-01-13 23:04:32Z dillon $ */
    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 (*shmfork_hook)(struct proc *, struct proc *) = NULL;
   45 void (*shmexit_hook)(struct vmspace *) = NULL;
   46 
   47 /* called from kern_fork.c */
   48 void
   49 shmfork(p1, p2)
   50         struct proc *p1, *p2;
   51 {
   52 
   53         if (shmfork_hook != NULL)
   54                 shmfork_hook(p1, p2);
   55         return;
   56 }
   57 
   58 /* called from kern_exit.c */
   59 void
   60 shmexit(struct vmspace *vm)
   61 {
   62 
   63         if (shmexit_hook != NULL)
   64                 shmexit_hook(vm);
   65         return;
   66 }
   67 
   68 /*
   69  * Check for ipc permission
   70  */
   71 
   72 int
   73 ipcperm(td, perm, mode)
   74         struct thread *td;
   75         struct ipc_perm *perm;
   76         int mode;
   77 {
   78         struct ucred *cred = td->td_ucred;
   79 
   80         /* Check for user match. */
   81         if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) {
   82                 if (mode & IPC_M)
   83                         return (suser(td) == 0 ? 0 : EPERM);
   84                 /* Check for group match. */
   85                 mode >>= 3;
   86                 if (!groupmember(perm->gid, cred) &&
   87                     !groupmember(perm->cgid, cred))
   88                         /* Check for `other' match. */
   89                         mode >>= 3;
   90         }
   91 
   92         if (mode & IPC_M)
   93                 return (0);
   94         return ((mode & perm->mode) == mode ||
   95             suser(td) == 0 ? 0 : EACCES);
   96 }

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FreeBSD/Linux Kernel Cross Reference sys/kern/sysv_ipc.c

FreeBSD/Linux Kernel Cross Reference
sys/kern/sysv_ipc.c