1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2013 Hudson River Trading LLC 5 * Written by: John H. Baldwin <jhb@FreeBSD.org> 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 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include <sys/procctl.h> 34 #include <sys/types.h> 35 #include <sys/mman.h> 36 #include <err.h> 37 #include <errno.h> 38 #include <stdbool.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <unistd.h> 42 43 static void 44 usage(void) 45 { 46 47 fprintf(stderr, "usage: protect [-i] command\n"); 48 fprintf(stderr, " protect [-cdi] -g pgrp | -p pid\n"); 49 exit(1); 50 } 51 52 static id_t 53 parse_id(char *id) 54 { 55 static bool first = true; 56 long value; 57 char *ch; 58 59 if (!first) { 60 warnx("only one -g or -p flag is permitted"); 61 usage(); 62 } 63 value = strtol(id, &ch, 0); 64 if (*ch != '\0') { 65 warnx("invalid process id"); 66 usage(); 67 } 68 return (value); 69 } 70 71 int 72 main(int argc, char *argv[]) 73 { 74 idtype_t idtype; 75 id_t id; 76 int ch, flags; 77 bool descend, inherit, idset; 78 79 idtype = P_PID; 80 id = getpid(); 81 flags = PPROT_SET; 82 descend = inherit = idset = false; 83 while ((ch = getopt(argc, argv, "cdig:p:")) != -1) 84 switch (ch) { 85 case 'c': 86 flags = PPROT_CLEAR; 87 break; 88 case 'd': 89 descend = true; 90 break; 91 case 'i': 92 inherit = true; 93 break; 94 case 'g': 95 idtype = P_PGID; 96 id = parse_id(optarg); 97 idset = true; 98 break; 99 case 'p': 100 idtype = P_PID; 101 id = parse_id(optarg); 102 idset = true; 103 break; 104 } 105 argc -= optind; 106 argv += optind; 107 108 if ((idset && argc != 0) || (!idset && (argc == 0 || descend))) 109 usage(); 110 111 if (descend) 112 flags |= PPROT_DESCEND; 113 if (inherit) 114 flags |= PPROT_INHERIT; 115 if (procctl(idtype, id, PROC_SPROTECT, &flags) == -1) 116 err(1, "procctl"); 117 118 if (argc != 0) { 119 errno = 0; 120 execvp(*argv, argv); 121 err(errno == ENOENT ? 127 : 126, "%s", *argv); 122 } 123 return (0); 124 } 125