1 /*- 2 * Copyright (c) 2016 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 6 * under sponsorship from the FreeBSD Foundation. 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 <err.h> 35 #include <stdbool.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 enum { 42 MODE_ASLR, 43 MODE_INVALID, 44 MODE_TRACE, 45 MODE_TRAPCAP, 46 #ifdef PROC_KPTI_CTL 47 MODE_KPTI, 48 #endif 49 }; 50 51 static pid_t 52 str2pid(const char *str) 53 { 54 pid_t res; 55 char *tail; 56 57 res = strtol(str, &tail, 0); 58 if (*tail != '\0') { 59 warnx("non-numeric pid"); 60 return (-1); 61 } 62 return (res); 63 } 64 65 #ifdef PROC_KPTI_CTL 66 #define KPTI_USAGE "|kpti" 67 #else 68 #define KPTI_USAGE 69 #endif 70 71 static void __dead2 72 usage(void) 73 { 74 75 fprintf(stderr, "Usage: proccontrol -m (aslr|trace|trapcap" 76 KPTI_USAGE") [-q] " 77 "[-s (enable|disable)] [-p pid | command]\n"); 78 exit(1); 79 } 80 81 int 82 main(int argc, char *argv[]) 83 { 84 int arg, ch, error, mode; 85 pid_t pid; 86 bool enable, do_command, query; 87 88 mode = MODE_INVALID; 89 enable = true; 90 pid = -1; 91 query = false; 92 while ((ch = getopt(argc, argv, "m:qs:p:")) != -1) { 93 switch (ch) { 94 case 'm': 95 if (strcmp(optarg, "aslr") == 0) 96 mode = MODE_ASLR; 97 else if (strcmp(optarg, "trace") == 0) 98 mode = MODE_TRACE; 99 else if (strcmp(optarg, "trapcap") == 0) 100 mode = MODE_TRAPCAP; 101 #ifdef PROC_KPTI_CTL 102 else if (strcmp(optarg, "kpti") == 0) 103 mode = MODE_KPTI; 104 #endif 105 else 106 usage(); 107 break; 108 case 's': 109 if (strcmp(optarg, "enable") == 0) 110 enable = true; 111 else if (strcmp(optarg, "disable") == 0) 112 enable = false; 113 else 114 usage(); 115 break; 116 case 'p': 117 pid = str2pid(optarg); 118 break; 119 case 'q': 120 query = true; 121 break; 122 case '?': 123 default: 124 usage(); 125 break; 126 } 127 } 128 argc -= optind; 129 argv += optind; 130 do_command = argc != 0; 131 if (do_command) { 132 if (pid != -1 || query) 133 usage(); 134 pid = getpid(); 135 } else if (pid == -1) { 136 pid = getpid(); 137 } 138 139 if (query) { 140 switch (mode) { 141 case MODE_ASLR: 142 error = procctl(P_PID, pid, PROC_ASLR_STATUS, &arg); 143 break; 144 case MODE_TRACE: 145 error = procctl(P_PID, pid, PROC_TRACE_STATUS, &arg); 146 break; 147 case MODE_TRAPCAP: 148 error = procctl(P_PID, pid, PROC_TRAPCAP_STATUS, &arg); 149 break; 150 #ifdef PROC_KPTI_CTL 151 case MODE_KPTI: 152 error = procctl(P_PID, pid, PROC_KPTI_STATUS, &arg); 153 break; 154 #endif 155 default: 156 usage(); 157 break; 158 } 159 if (error != 0) 160 err(1, "procctl status"); 161 switch (mode) { 162 case MODE_ASLR: 163 switch (arg & ~PROC_ASLR_ACTIVE) { 164 case PROC_ASLR_FORCE_ENABLE: 165 printf("force enabled"); 166 break; 167 case PROC_ASLR_FORCE_DISABLE: 168 printf("force disabled"); 169 break; 170 case PROC_ASLR_NOFORCE: 171 printf("not forced"); 172 break; 173 } 174 if ((arg & PROC_ASLR_ACTIVE) != 0) 175 printf(", active\n"); 176 else 177 printf(", not active\n"); 178 break; 179 case MODE_TRACE: 180 if (arg == -1) 181 printf("disabled\n"); 182 else if (arg == 0) 183 printf("enabled, no debugger\n"); 184 else 185 printf("enabled, traced by %d\n", arg); 186 break; 187 case MODE_TRAPCAP: 188 switch (arg) { 189 case PROC_TRAPCAP_CTL_ENABLE: 190 printf("enabled\n"); 191 break; 192 case PROC_TRAPCAP_CTL_DISABLE: 193 printf("disabled\n"); 194 break; 195 } 196 break; 197 #ifdef PROC_KPTI_CTL 198 case MODE_KPTI: 199 switch (arg & ~PROC_KPTI_STATUS_ACTIVE) { 200 case PROC_KPTI_CTL_ENABLE_ON_EXEC: 201 printf("enabled"); 202 break; 203 case PROC_KPTI_CTL_DISABLE_ON_EXEC: 204 printf("disabled"); 205 break; 206 } 207 if ((arg & PROC_KPTI_STATUS_ACTIVE) != 0) 208 printf(", active\n"); 209 else 210 printf(", not active\n"); 211 break; 212 #endif 213 } 214 } else { 215 switch (mode) { 216 case MODE_ASLR: 217 arg = enable ? PROC_ASLR_FORCE_ENABLE : 218 PROC_ASLR_FORCE_DISABLE; 219 error = procctl(P_PID, pid, PROC_ASLR_CTL, &arg); 220 break; 221 case MODE_TRACE: 222 arg = enable ? PROC_TRACE_CTL_ENABLE : 223 PROC_TRACE_CTL_DISABLE; 224 error = procctl(P_PID, pid, PROC_TRACE_CTL, &arg); 225 break; 226 case MODE_TRAPCAP: 227 arg = enable ? PROC_TRAPCAP_CTL_ENABLE : 228 PROC_TRAPCAP_CTL_DISABLE; 229 error = procctl(P_PID, pid, PROC_TRAPCAP_CTL, &arg); 230 break; 231 #ifdef PROC_KPTI_CTL 232 case MODE_KPTI: 233 arg = enable ? PROC_KPTI_CTL_ENABLE_ON_EXEC : 234 PROC_KPTI_CTL_DISABLE_ON_EXEC; 235 error = procctl(P_PID, pid, PROC_KPTI_CTL, &arg); 236 break; 237 #endif 238 default: 239 usage(); 240 break; 241 } 242 if (error != 0) 243 err(1, "procctl ctl"); 244 if (do_command) { 245 error = execvp(argv[0], argv); 246 err(1, "exec"); 247 } 248 } 249 exit(0); 250 } 251