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

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    1 /*      $NetBSD: sysv_ipc.c,v 1.15 2001/11/12 15:25:25 lukem Exp $      */
    2 
    3 /*-
    4  * Copyright (c) 1998 The NetBSD Foundation, Inc.
    5  * All rights reserved.
    6  *
    7  * This code is derived from software contributed to The NetBSD Foundation
    8  * by Charles M. Hannum.
    9  *
   10  * Redistribution and use in source and binary forms, with or without
   11  * modification, are permitted provided that the following conditions
   12  * are met:
   13  * 1. Redistributions of source code must retain the above copyright
   14  *    notice, this list of conditions and the following disclaimer.
   15  * 2. Redistributions in binary form must reproduce the above copyright
   16  *    notice, this list of conditions and the following disclaimer in the
   17  *    documentation and/or other materials provided with the distribution.
   18  * 3. All advertising materials mentioning features or use of this software
   19  *    must display the following acknowledgement:
   20  *      This product includes software developed by the NetBSD
   21  *      Foundation, Inc. and its contributors.
   22  * 4. Neither the name of The NetBSD Foundation nor the names of its
   23  *    contributors may be used to endorse or promote products derived
   24  *    from this software without specific prior written permission.
   25  *
   26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   36  * POSSIBILITY OF SUCH DAMAGE.
   37  */
   38 
   39 #include <sys/cdefs.h>
   40 __KERNEL_RCSID(0, "$NetBSD: sysv_ipc.c,v 1.15 2001/11/12 15:25:25 lukem Exp $");
   41 
   42 #include <sys/param.h>
   43 #include <sys/kernel.h>
   44 #include <sys/proc.h>
   45 #include <sys/ipc.h>
   46 #include <sys/systm.h>
   47 #include <sys/mount.h>
   48 #include <sys/vnode.h>
   49 #include <sys/stat.h>
   50 
   51 /*
   52  * Check for ipc permission
   53  */
   54 
   55 int
   56 ipcperm(cred, perm, mode)
   57         struct ucred *cred;
   58         struct ipc_perm *perm;
   59         int mode;
   60 {
   61         mode_t mask;
   62 
   63         if (cred->cr_uid == 0)
   64                 return (0);
   65 
   66         if (mode == IPC_M) {
   67                 if (cred->cr_uid == perm->uid ||
   68                     cred->cr_uid == perm->cuid)
   69                         return (0);
   70                 return (EPERM);
   71         }
   72 
   73         mask = 0;
   74 
   75         if (cred->cr_uid == perm->uid ||
   76             cred->cr_uid == perm->cuid) {
   77                 if (mode & IPC_R)
   78                         mask |= S_IRUSR;
   79                 if (mode & IPC_W)
   80                         mask |= S_IWUSR;
   81                 return ((perm->mode & mask) == mask ? 0 : EACCES);
   82         }
   83 
   84         if (cred->cr_gid == perm->gid || groupmember(perm->gid, cred) ||
   85             cred->cr_gid == perm->cgid || groupmember(perm->cgid, cred)) {
   86                 if (mode & IPC_R)
   87                         mask |= S_IRGRP;
   88                 if (mode & IPC_W)
   89                         mask |= S_IWGRP;
   90                 return ((perm->mode & mask) == mask ? 0 : EACCES);
   91         }
   92 
   93         if (mode & IPC_R)
   94                 mask |= S_IROTH;
   95         if (mode & IPC_W)
   96                 mask |= S_IWOTH;
   97         return ((perm->mode & mask) == mask ? 0 : EACCES);
   98 }

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