1 files changed, 117 insertions, 0 deletions
diff --git a/sys/kern/sysv_ipc.c b/sys/kern/sysv_ipc.c
new file mode 100644
index 0000000..cc8531d
--- /dev/null
+++ b/sys/kern/sysv_ipc.c
@@ -0,0 +1,117 @@
+/*	$NetBSD: sysv_ipc.c,v 1.7 1994/06/29 06:33:11 cgd Exp $	*/
+/*
+ * Copyright (c) 1994 Herb Peyerl <hpeyerl@novatel.ca>
+ * All rights reserved.
+ *
+ * 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 Herb Peyerl.
+ * 4. The name of Herb Peyerl may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include "opt_sysvipc.h"
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sem.h>
+#include <sys/shm.h>
+#include <sys/ipc.h>
+#include <sys/proc.h>
+#include <sys/ucred.h>
+
+void (*shmfork_hook)(struct proc *, struct proc *) = NULL;
+void (*shmexit_hook)(struct vmspace *) = NULL;
+
+/* called from kern_fork.c */
+void
+shmfork(p1, p2)
+	struct proc *p1, *p2;
+{
+
+	if (shmfork_hook != NULL)
+		shmfork_hook(p1, p2);
+	return;
+}
+
+/* called from kern_exit.c */
+void
+shmexit(struct vmspace *vm)
+{
+
+	if (shmexit_hook != NULL)
+		shmexit_hook(vm);
+	return;
+}
+
+/*
+ * Check for ipc permission
+ */
+
+int
+ipcperm(td, perm, mode)
+	struct thread *td;
+	struct ipc_perm *perm;
+	int mode;
+{
+	struct ucred *cred = td->td_ucred;
+	int error;
+
+	if (cred->cr_uid != perm->cuid && cred->cr_uid != perm->uid) {
+		/*
+		 * For a non-create/owner, we require privilege to
+		 * modify the object protections.  Note: some other
+		 * implementations permit IPC_M to be delegated to
+		 * unprivileged non-creator/owner uids/gids.
+		 */
+		if (mode & IPC_M) {
+			error = suser(td);
+			if (error)
+				return (error);
+		}
+		/*
+		 * Try to match against creator/owner group; if not, fall
+		 * back on other.
+		 */
+		mode >>= 3;
+		if (!groupmember(perm->gid, cred) &&
+		    !groupmember(perm->cgid, cred))
+			mode >>= 3;
+	} else {
+		/*
+		 * Always permit the creator/owner to update the object
+		 * protections regardless of whether the object mode
+		 * permits it.
+		 */
+		if (mode & IPC_M)
+			return (0);
+	}
+
+	if ((mode & perm->mode) != mode) {
+		if (suser(td) != 0)
+			return (EACCES);
+	}
+	return (0);
+}