1 files changed, 122 insertions, 0 deletions
diff --git a/usr.bin/protect/protect.c b/usr.bin/protect/protect.c
new file mode 100644
index 000000000000..12c5c53083b1
--- /dev/null
+++ b/usr.bin/protect/protect.c
@@ -0,0 +1,122 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2013 Hudson River Trading LLC
+ * Written by: John H. Baldwin <jhb@FreeBSD.org>
+ * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ */
+
+#include <sys/cdefs.h>
+#include <sys/procctl.h>
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <err.h>
+#include <errno.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+static void
+usage(void)
+{
+
+	fprintf(stderr, "usage: protect [-i] command\n");
+	fprintf(stderr, "       protect [-cdi] -g pgrp | -p pid\n");
+	exit(1);
+}
+
+static id_t
+parse_id(char *id)
+{
+	static bool first = true;
+	long value;
+	char *ch;
+
+	if (!first) {
+		warnx("only one -g or -p flag is permitted");
+		usage();
+	}
+	value = strtol(id, &ch, 0);
+	if (*ch != '\0') {
+		warnx("invalid process id");
+		usage();
+	}
+	return (value);
+}
+
+int
+main(int argc, char *argv[])
+{
+	idtype_t idtype;
+	id_t id;
+	int ch, flags;
+	bool descend, inherit, idset;
+
+	idtype = P_PID;
+	id = getpid();
+	flags = PPROT_SET;
+	descend = inherit = idset = false;
+	while ((ch = getopt(argc, argv, "cdig:p:")) != -1)
+		switch (ch) {
+		case 'c':
+			flags = PPROT_CLEAR;
+			break;
+		case 'd':
+			descend = true;
+			break;
+		case 'i':
+			inherit = true;
+			break;
+		case 'g':
+			idtype = P_PGID;
+			id = parse_id(optarg);
+			idset = true;
+			break;
+		case 'p':
+			idtype = P_PID;
+			id = parse_id(optarg);
+			idset = true;
+			break;
+		}
+	argc -= optind;
+	argv += optind;
+
+	if ((idset && argc != 0) || (!idset && (argc == 0 || descend)))
+		usage();
+
+	if (descend)
+		flags |= PPROT_DESCEND;
+	if (inherit)
+		flags |= PPROT_INHERIT;
+	if (procctl(idtype, id, PROC_SPROTECT, &flags) == -1)
+		err(1, "procctl");
+
+	if (argc != 0) {
+		errno = 0;
+		execvp(*argv, argv);
+		err(errno == ENOENT ? 127 : 126, "%s", *argv);
+	}
+	return (0);
+}