release/1.1.0_cvs

1 files changed, 103 insertions, 0 deletions

diff --git a/sys/kern/sysv_ipc.c b/sys/kern/sysv_ipc.c
new file mode 100644
index 000000000000..767c1d9ff19b
--- /dev/null
+++ b/sys/kern/sysv_ipc.c
@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 1988 University of Utah.
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * the Systems Programming Group of the University of Utah Computer
+ * Science Department. Originally from University of Wisconsin.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * from: Utah $Hdr: uipc_shm.c 1.9 89/08/14$
+ *
+ *	@(#)sysv_shm.c	7.15 (Berkeley) 5/13/91
+ */
+
+/*
+ * IPC routines shared by some or all of the SYSV IPC system calls.
+ */
+
+#ifndef SYSVIPC
+
+#ifdef SYSVSHM
+#define SYSVIPC
+#endif
+
+#ifdef SYSVSEM
+#define SYSVIPC
+#endif
+
+#ifdef SYSVMSG
+#define SYSVIPC
+#endif
+
+#endif
+
+#ifdef SYSVIPC
+
+#include "param.h"
+#include "systm.h"
+#include "kernel.h"
+#include "proc.h"
+#include "ipc.h"
+#include "shm.h"
+
+/*
+ * Perform access checking.
+ */
+
+int
+ipcaccess(ipc, mode, cred)
+	register struct ipc_perm *ipc;
+	int mode;
+	register struct ucred *cred;
+{
+	register int m;
+
+	if (cred->cr_uid == 0)
+		return(0);
+	/*
+	 * Access check is based on only one of owner, group, public.
+	 * If not owner, then check group.
+	 * If not a member of the group, then check public access.
+	 */
+	mode &= 0700;
+	m = ipc->mode;
+	if (cred->cr_uid != ipc->uid && cred->cr_uid != ipc->cuid) {
+		m <<= 3;
+		if (!groupmember(ipc->gid, cred) &&
+		    !groupmember(ipc->cgid, cred))
+			m <<= 3;
+	}
+	if ((mode&m) == mode)
+		return (0);
+	return (EACCES);
+}
+#endif /* SYSVSHM */