1 /*- 2 * Copyright (c) 2016 The FreeBSD Foundation 3 * 4 * This software was developed by Konstantin Belousov <kib@FreeBSD.org> 5 * under sponsorship from the FreeBSD Foundation. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #include <sys/param.h> 30 #include <sys/procctl.h> 31 #include <err.h> 32 #include <stdbool.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <unistd.h> 37 38 enum mode { 39 MODE_INVALID, 40 MODE_ASLR, 41 MODE_TRACE, 42 MODE_TRAPCAP, 43 MODE_PROTMAX, 44 MODE_STACKGAP, 45 MODE_NO_NEW_PRIVS, 46 MODE_WXMAP, 47 #ifdef PROC_KPTI_CTL 48 MODE_KPTI, 49 #endif 50 #ifdef PROC_LA_CTL 51 MODE_LA57, 52 MODE_LA48, 53 #endif 54 }; 55 56 static const struct { 57 enum mode mode; 58 const char *name; 59 } modes[] = { 60 { MODE_ASLR, "aslr" }, 61 { MODE_TRACE, "trace" }, 62 { MODE_TRAPCAP, "trapcap" }, 63 { MODE_PROTMAX, "protmax" }, 64 { MODE_STACKGAP, "stackgap" }, 65 { MODE_NO_NEW_PRIVS, "nonewprivs" }, 66 { MODE_WXMAP, "wxmap" }, 67 #ifdef PROC_KPTI_CTL 68 { MODE_KPTI, "kpti" }, 69 #endif 70 #ifdef PROC_LA_CTL 71 { MODE_LA57, "la57" }, 72 { MODE_LA48, "la48" }, 73 #endif 74 }; 75 76 static pid_t 77 str2pid(const char *str) 78 { 79 pid_t res; 80 char *tail; 81 82 res = strtol(str, &tail, 0); 83 if (*tail != '\0') { 84 warnx("non-numeric pid"); 85 return (-1); 86 } 87 return (res); 88 } 89 90 static void __dead2 91 usage(void) 92 { 93 fprintf(stderr, "Usage:\n"); 94 fprintf(stderr, " proccontrol -m mode -s (enable|disable) " 95 "(-p pid | command)\n"); 96 fprintf(stderr, " proccontrol -m mode -q [-p pid]\n"); 97 fprintf(stderr, "Modes: "); 98 for (size_t i = 0; i < nitems(modes); i++) 99 fprintf(stderr, "%s%s", i == 0 ? "" : "|", modes[i].name); 100 fprintf(stderr, "\n"); 101 exit(1); 102 } 103 104 int 105 main(int argc, char *argv[]) 106 { 107 int arg, ch, error, mode; 108 pid_t pid; 109 bool enable, do_command, query; 110 111 mode = MODE_INVALID; 112 enable = true; 113 pid = -1; 114 query = false; 115 while ((ch = getopt(argc, argv, "m:qs:p:")) != -1) { 116 switch (ch) { 117 case 'm': 118 if (mode != MODE_INVALID) 119 usage(); 120 for (size_t i = 0; i < nitems(modes); i++) { 121 if (strcmp(optarg, modes[i].name) == 0) { 122 mode = modes[i].mode; 123 break; 124 } 125 } 126 if (mode == MODE_INVALID) 127 usage(); 128 break; 129 case 's': 130 if (strcmp(optarg, "enable") == 0) 131 enable = true; 132 else if (strcmp(optarg, "disable") == 0) 133 enable = false; 134 else 135 usage(); 136 break; 137 case 'p': 138 pid = str2pid(optarg); 139 break; 140 case 'q': 141 query = true; 142 break; 143 case '?': 144 default: 145 usage(); 146 break; 147 } 148 } 149 argc -= optind; 150 argv += optind; 151 do_command = argc != 0; 152 if (do_command) { 153 if (pid != -1 || query) 154 usage(); 155 pid = getpid(); 156 } else if (pid == -1) { 157 if (!query) 158 usage(); 159 pid = getpid(); 160 } 161 162 if (query) { 163 switch (mode) { 164 case MODE_ASLR: 165 error = procctl(P_PID, pid, PROC_ASLR_STATUS, &arg); 166 break; 167 case MODE_TRACE: 168 error = procctl(P_PID, pid, PROC_TRACE_STATUS, &arg); 169 break; 170 case MODE_TRAPCAP: 171 error = procctl(P_PID, pid, PROC_TRAPCAP_STATUS, &arg); 172 break; 173 case MODE_PROTMAX: 174 error = procctl(P_PID, pid, PROC_PROTMAX_STATUS, &arg); 175 break; 176 case MODE_STACKGAP: 177 error = procctl(P_PID, pid, PROC_STACKGAP_STATUS, &arg); 178 break; 179 case MODE_NO_NEW_PRIVS: 180 error = procctl(P_PID, pid, PROC_NO_NEW_PRIVS_STATUS, 181 &arg); 182 break; 183 case MODE_WXMAP: 184 error = procctl(P_PID, pid, PROC_WXMAP_STATUS, &arg); 185 break; 186 #ifdef PROC_KPTI_CTL 187 case MODE_KPTI: 188 error = procctl(P_PID, pid, PROC_KPTI_STATUS, &arg); 189 break; 190 #endif 191 #ifdef PROC_LA_CTL 192 case MODE_LA57: 193 case MODE_LA48: 194 error = procctl(P_PID, pid, PROC_LA_STATUS, &arg); 195 break; 196 #endif 197 default: 198 usage(); 199 break; 200 } 201 if (error != 0) 202 err(1, "procctl status"); 203 switch (mode) { 204 case MODE_ASLR: 205 switch (arg & ~PROC_ASLR_ACTIVE) { 206 case PROC_ASLR_FORCE_ENABLE: 207 printf("force enabled"); 208 break; 209 case PROC_ASLR_FORCE_DISABLE: 210 printf("force disabled"); 211 break; 212 case PROC_ASLR_NOFORCE: 213 printf("not forced"); 214 break; 215 } 216 if ((arg & PROC_ASLR_ACTIVE) != 0) 217 printf(", active\n"); 218 else 219 printf(", not active\n"); 220 break; 221 case MODE_TRACE: 222 if (arg == -1) 223 printf("disabled\n"); 224 else if (arg == 0) 225 printf("enabled, no debugger\n"); 226 else 227 printf("enabled, traced by %d\n", arg); 228 break; 229 case MODE_TRAPCAP: 230 switch (arg) { 231 case PROC_TRAPCAP_CTL_ENABLE: 232 printf("enabled\n"); 233 break; 234 case PROC_TRAPCAP_CTL_DISABLE: 235 printf("disabled\n"); 236 break; 237 } 238 break; 239 case MODE_PROTMAX: 240 switch (arg & ~PROC_PROTMAX_ACTIVE) { 241 case PROC_PROTMAX_FORCE_ENABLE: 242 printf("force enabled"); 243 break; 244 case PROC_PROTMAX_FORCE_DISABLE: 245 printf("force disabled"); 246 break; 247 case PROC_PROTMAX_NOFORCE: 248 printf("not forced"); 249 break; 250 } 251 if ((arg & PROC_PROTMAX_ACTIVE) != 0) 252 printf(", active\n"); 253 else 254 printf(", not active\n"); 255 break; 256 case MODE_STACKGAP: 257 switch (arg & (PROC_STACKGAP_ENABLE | 258 PROC_STACKGAP_DISABLE)) { 259 case PROC_STACKGAP_ENABLE: 260 printf("enabled\n"); 261 break; 262 case PROC_STACKGAP_DISABLE: 263 printf("disabled\n"); 264 break; 265 } 266 switch (arg & (PROC_STACKGAP_ENABLE_EXEC | 267 PROC_STACKGAP_DISABLE_EXEC)) { 268 case PROC_STACKGAP_ENABLE_EXEC: 269 printf("enabled after exec\n"); 270 break; 271 case PROC_STACKGAP_DISABLE_EXEC: 272 printf("disabled after exec\n"); 273 break; 274 } 275 break; 276 case MODE_NO_NEW_PRIVS: 277 switch (arg) { 278 case PROC_NO_NEW_PRIVS_ENABLE: 279 printf("enabled\n"); 280 break; 281 case PROC_NO_NEW_PRIVS_DISABLE: 282 printf("disabled\n"); 283 break; 284 } 285 break; 286 case MODE_WXMAP: 287 if ((arg & PROC_WX_MAPPINGS_PERMIT) != 0) 288 printf("enabled"); 289 else 290 printf("disabled"); 291 if ((arg & PROC_WX_MAPPINGS_DISALLOW_EXEC) != 0) 292 printf(", disabled on exec"); 293 if ((arg & PROC_WXORX_ENFORCE) != 0) 294 printf(", wxorx enforced"); 295 printf("\n"); 296 break; 297 #ifdef PROC_KPTI_CTL 298 case MODE_KPTI: 299 switch (arg & ~PROC_KPTI_STATUS_ACTIVE) { 300 case PROC_KPTI_CTL_ENABLE_ON_EXEC: 301 printf("enabled"); 302 break; 303 case PROC_KPTI_CTL_DISABLE_ON_EXEC: 304 printf("disabled"); 305 break; 306 } 307 if ((arg & PROC_KPTI_STATUS_ACTIVE) != 0) 308 printf(", active\n"); 309 else 310 printf(", not active\n"); 311 break; 312 #endif 313 #ifdef PROC_LA_CTL 314 case MODE_LA57: 315 case MODE_LA48: 316 switch (arg & ~(PROC_LA_STATUS_LA48 | 317 PROC_LA_STATUS_LA57)) { 318 case PROC_LA_CTL_LA48_ON_EXEC: 319 printf("la48 on exec"); 320 break; 321 case PROC_LA_CTL_LA57_ON_EXEC: 322 printf("la57 on exec"); 323 break; 324 case PROC_LA_CTL_DEFAULT_ON_EXEC: 325 printf("default on exec"); 326 break; 327 } 328 if ((arg & PROC_LA_STATUS_LA48) != 0) 329 printf(", la48 active\n"); 330 else if ((arg & PROC_LA_STATUS_LA57) != 0) 331 printf(", la57 active\n"); 332 break; 333 #endif 334 } 335 } else { 336 switch (mode) { 337 case MODE_ASLR: 338 arg = enable ? PROC_ASLR_FORCE_ENABLE : 339 PROC_ASLR_FORCE_DISABLE; 340 error = procctl(P_PID, pid, PROC_ASLR_CTL, &arg); 341 break; 342 case MODE_TRACE: 343 arg = enable ? PROC_TRACE_CTL_ENABLE : 344 PROC_TRACE_CTL_DISABLE; 345 error = procctl(P_PID, pid, PROC_TRACE_CTL, &arg); 346 break; 347 case MODE_TRAPCAP: 348 arg = enable ? PROC_TRAPCAP_CTL_ENABLE : 349 PROC_TRAPCAP_CTL_DISABLE; 350 error = procctl(P_PID, pid, PROC_TRAPCAP_CTL, &arg); 351 break; 352 case MODE_PROTMAX: 353 arg = enable ? PROC_PROTMAX_FORCE_ENABLE : 354 PROC_PROTMAX_FORCE_DISABLE; 355 error = procctl(P_PID, pid, PROC_PROTMAX_CTL, &arg); 356 break; 357 case MODE_STACKGAP: 358 arg = enable ? PROC_STACKGAP_ENABLE_EXEC : 359 (PROC_STACKGAP_DISABLE | 360 PROC_STACKGAP_DISABLE_EXEC); 361 error = procctl(P_PID, pid, PROC_STACKGAP_CTL, &arg); 362 break; 363 case MODE_NO_NEW_PRIVS: 364 arg = enable ? PROC_NO_NEW_PRIVS_ENABLE : 365 PROC_NO_NEW_PRIVS_DISABLE; 366 error = procctl(P_PID, pid, PROC_NO_NEW_PRIVS_CTL, 367 &arg); 368 break; 369 case MODE_WXMAP: 370 arg = enable ? PROC_WX_MAPPINGS_PERMIT : 371 PROC_WX_MAPPINGS_DISALLOW_EXEC; 372 error = procctl(P_PID, pid, PROC_WXMAP_CTL, &arg); 373 break; 374 #ifdef PROC_KPTI_CTL 375 case MODE_KPTI: 376 arg = enable ? PROC_KPTI_CTL_ENABLE_ON_EXEC : 377 PROC_KPTI_CTL_DISABLE_ON_EXEC; 378 error = procctl(P_PID, pid, PROC_KPTI_CTL, &arg); 379 break; 380 #endif 381 #ifdef PROC_LA_CTL 382 case MODE_LA57: 383 arg = enable ? PROC_LA_CTL_LA57_ON_EXEC : 384 PROC_LA_CTL_DEFAULT_ON_EXEC; 385 error = procctl(P_PID, pid, PROC_LA_CTL, &arg); 386 break; 387 case MODE_LA48: 388 arg = enable ? PROC_LA_CTL_LA48_ON_EXEC : 389 PROC_LA_CTL_DEFAULT_ON_EXEC; 390 error = procctl(P_PID, pid, PROC_LA_CTL, &arg); 391 break; 392 #endif 393 default: 394 usage(); 395 break; 396 } 397 if (error != 0) 398 err(1, "procctl ctl"); 399 if (do_command) { 400 error = execvp(argv[0], argv); 401 err(1, "exec"); 402 } 403 } 404 exit(0); 405 } 406