1 /* $OpenBSD: kvm_proc2.c,v 1.29 2019/06/23 16:57:02 deraadt Exp $ */ 2 /* $NetBSD: kvm_proc.c,v 1.30 1999/03/24 05:50:50 mrg Exp $ */ 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Charles M. Hannum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 /*- 32 * Copyright (c) 1994, 1995 Charles M. Hannum. All rights reserved. 33 * Copyright (c) 1989, 1992, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software developed by the Computer Systems 37 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 38 * BG 91-66 and contributed to Berkeley. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 /* 66 * Proc traversal interface for kvm. ps and w are (probably) the exclusive 67 * users of this code, so we've factored it out into a separate module. 68 * Thus, we keep this grunge out of the other kvm applications (i.e., 69 * most other applications are interested only in open/close/read/nlist). 70 */ 71 72 #define __need_process 73 #include <sys/param.h> 74 #include <sys/proc.h> 75 #include <sys/exec.h> 76 #include <sys/stat.h> 77 #include <sys/ucred.h> 78 #include <sys/ioctl.h> 79 #include <sys/tty.h> 80 #include <sys/resource.h> 81 #include <sys/resourcevar.h> 82 #include <sys/signalvar.h> 83 #include <sys/pledge.h> 84 #include <stddef.h> 85 #include <stdlib.h> 86 #include <string.h> 87 #include <unistd.h> 88 #include <nlist.h> 89 #include <kvm.h> 90 91 #include <uvm/uvm_extern.h> 92 #include <uvm/uvm_amap.h> 93 #include <machine/vmparam.h> 94 #include <machine/pmap.h> 95 96 #include <sys/sysctl.h> 97 98 #include <limits.h> 99 #include <errno.h> 100 #include <db.h> 101 #include <paths.h> 102 103 #include "kvm_private.h" 104 105 /* 106 * Read proc's from memory file into buffer bp, which has space to hold 107 * at most maxcnt procs. 108 */ 109 static int 110 kvm_proclist(kvm_t *kd, int op, int arg, struct process *pr, 111 char *bp, int maxcnt, size_t esize) 112 { 113 struct kinfo_proc kp; 114 struct session sess; 115 struct ucred ucred; 116 struct proc proc, *p; 117 struct process process, process2; 118 struct pgrp pgrp; 119 struct tty tty; 120 struct sigacts sa, *sap; 121 struct vmspace vm, *vmp; 122 struct plimit limits, *limp; 123 pid_t parent_pid, leader_pid; 124 int cnt = 0; 125 int dothreads = 0; 126 127 dothreads = op & KERN_PROC_SHOW_THREADS; 128 op &= ~KERN_PROC_SHOW_THREADS; 129 130 /* 131 * Modelled on sysctl_doproc() in sys/kern/kern_sysctl.c 132 */ 133 for (; cnt < maxcnt && pr != NULL; pr = LIST_NEXT(&process, ps_list)) { 134 if (KREAD(kd, (u_long)pr, &process)) { 135 _kvm_err(kd, kd->program, "can't read process at %lx", 136 (u_long)pr); 137 return (-1); 138 } 139 if (process.ps_pgrp == NULL) 140 continue; 141 if (process.ps_flags & PS_EMBRYO) 142 continue; 143 if (KREAD(kd, (u_long)process.ps_ucred, &ucred)) { 144 _kvm_err(kd, kd->program, "can't read ucred at %lx", 145 (u_long)process.ps_ucred); 146 return (-1); 147 } 148 if (KREAD(kd, (u_long)process.ps_pgrp, &pgrp)) { 149 _kvm_err(kd, kd->program, "can't read pgrp at %lx", 150 (u_long)process.ps_pgrp); 151 return (-1); 152 } 153 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) { 154 _kvm_err(kd, kd->program, "can't read session at %lx", 155 (u_long)pgrp.pg_session); 156 return (-1); 157 } 158 if ((process.ps_flags & PS_CONTROLT) && sess.s_ttyp != NULL && 159 KREAD(kd, (u_long)sess.s_ttyp, &tty)) { 160 _kvm_err(kd, kd->program, "can't read tty at %lx", 161 (u_long)sess.s_ttyp); 162 return (-1); 163 } 164 if (process.ps_pptr) { 165 if (KREAD(kd, (u_long)process.ps_pptr, &process2)) { 166 _kvm_err(kd, kd->program, 167 "can't read process at %lx", 168 (u_long)process.ps_pptr); 169 return (-1); 170 } 171 parent_pid = process2.ps_pid; 172 } 173 else 174 parent_pid = 0; 175 if (sess.s_leader) { 176 if (KREAD(kd, (u_long)sess.s_leader, &process2)) { 177 _kvm_err(kd, kd->program, 178 "can't read proc at %lx", 179 (u_long)sess.s_leader); 180 return (-1); 181 } 182 leader_pid = process2.ps_pid; 183 } 184 else 185 leader_pid = 0; 186 if (process.ps_sigacts) { 187 if (KREAD(kd, (u_long)process.ps_sigacts, &sa)) { 188 _kvm_err(kd, kd->program, 189 "can't read sigacts at %lx", 190 (u_long)process.ps_sigacts); 191 return (-1); 192 } 193 sap = &sa; 194 } 195 else 196 sap = NULL; 197 198 switch (op) { 199 case KERN_PROC_PID: 200 if (process.ps_pid != (pid_t)arg) 201 continue; 202 break; 203 204 case KERN_PROC_PGRP: 205 if (pgrp.pg_id != (pid_t)arg) 206 continue; 207 break; 208 209 case KERN_PROC_SESSION: 210 if (sess.s_leader == NULL || 211 leader_pid != (pid_t)arg) 212 continue; 213 break; 214 215 case KERN_PROC_TTY: 216 if ((process.ps_flags & PS_CONTROLT) == 0 || 217 sess.s_ttyp == NULL || 218 tty.t_dev != (dev_t)arg) 219 continue; 220 break; 221 222 case KERN_PROC_UID: 223 if (ucred.cr_uid != (uid_t)arg) 224 continue; 225 break; 226 227 case KERN_PROC_RUID: 228 if (ucred.cr_ruid != (uid_t)arg) 229 continue; 230 break; 231 232 case KERN_PROC_ALL: 233 if (process.ps_flags & PS_SYSTEM) 234 continue; 235 break; 236 237 case KERN_PROC_KTHREAD: 238 /* no filtering */ 239 break; 240 241 default: 242 _kvm_err(kd, kd->program, "invalid filter"); 243 return (-1); 244 } 245 246 /* 247 * We're going to add another proc to the set. If this 248 * will overflow the buffer, assume the reason is because 249 * nthreads (or the proc list) is corrupt and declare an error. 250 */ 251 if (cnt >= maxcnt) { 252 _kvm_err(kd, kd->program, "nthreads corrupt"); 253 return (-1); 254 } 255 256 /* set up stuff that might not always be there */ 257 limp = &limits; 258 if (!process.ps_limit || 259 KREAD(kd, (u_long)process.ps_limit, &limits)) 260 limp = NULL; 261 262 vmp = NULL; 263 264 if ((process.ps_flags & PS_ZOMBIE) == 0 && 265 !KREAD(kd, (u_long)process.ps_vmspace, &vm)) 266 vmp = &vm; 267 268 #define do_copy_str(_d, _s, _l) kvm_read(kd, (u_long)(_s), (_d), (_l)-1) 269 FILL_KPROC(&kp, do_copy_str, &proc, &process, 270 &ucred, &pgrp, process.ps_mainproc, pr, &sess, 271 vmp, limp, sap, 0, 1); 272 273 /* stuff that's too painful to generalize */ 274 kp.p_ppid = parent_pid; 275 kp.p_sid = leader_pid; 276 if ((process.ps_flags & PS_CONTROLT) && sess.s_ttyp != NULL) { 277 kp.p_tdev = tty.t_dev; 278 if (tty.t_pgrp != NULL && 279 tty.t_pgrp != process.ps_pgrp && 280 KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 281 _kvm_err(kd, kd->program, 282 "can't read tpgrp at %lx", 283 (u_long)tty.t_pgrp); 284 return (-1); 285 } 286 kp.p_tpgid = tty.t_pgrp ? pgrp.pg_id : -1; 287 kp.p_tsess = PTRTOINT64(tty.t_session); 288 } else { 289 kp.p_tpgid = -1; 290 kp.p_tdev = NODEV; 291 } 292 293 /* update %cpu for all threads */ 294 if (dothreads) { 295 if (KREAD(kd, (u_long)process.ps_mainproc, &proc)) { 296 _kvm_err(kd, kd->program, 297 "can't read proc at %lx", 298 (u_long)process.ps_mainproc); 299 return (-1); 300 } 301 kp.p_pctcpu = proc.p_pctcpu; 302 kp.p_stat = proc.p_stat; 303 } else { 304 kp.p_pctcpu = 0; 305 kp.p_stat = (process.ps_flags & PS_ZOMBIE) ? SDEAD : 306 SIDL; 307 for (p = TAILQ_FIRST(&process.ps_threads); p != NULL; 308 p = TAILQ_NEXT(&proc, p_thr_link)) { 309 if (KREAD(kd, (u_long)p, &proc)) { 310 _kvm_err(kd, kd->program, 311 "can't read proc at %lx", 312 (u_long)p); 313 return (-1); 314 } 315 kp.p_pctcpu += proc.p_pctcpu; 316 /* 317 * find best state: 318 * ONPROC > RUN > STOP > SLEEP > ... 319 */ 320 if (proc.p_stat == SONPROC || 321 kp.p_stat == SONPROC) 322 kp.p_stat = SONPROC; 323 else if (proc.p_stat == SRUN || 324 kp.p_stat == SRUN) 325 kp.p_stat = SRUN; 326 else if (proc.p_stat == SSTOP || 327 kp.p_stat == SSTOP) 328 kp.p_stat = SSTOP; 329 else if (proc.p_stat == SSLEEP) 330 kp.p_stat = SSLEEP; 331 } 332 } 333 334 memcpy(bp, &kp, esize); 335 bp += esize; 336 ++cnt; 337 338 /* Skip per-thread entries if not required by op */ 339 if (!dothreads) 340 continue; 341 342 for (p = TAILQ_FIRST(&process.ps_threads); p != NULL; 343 p = TAILQ_NEXT(&proc, p_thr_link)) { 344 if (KREAD(kd, (u_long)p, &proc)) { 345 _kvm_err(kd, kd->program, 346 "can't read proc at %lx", 347 (u_long)p); 348 return (-1); 349 } 350 FILL_KPROC(&kp, do_copy_str, &proc, &process, 351 &ucred, &pgrp, p, pr, &sess, vmp, limp, sap, 352 1, 1); 353 354 /* see above */ 355 kp.p_ppid = parent_pid; 356 kp.p_sid = leader_pid; 357 if ((process.ps_flags & PS_CONTROLT) && 358 sess.s_ttyp != NULL) { 359 kp.p_tdev = tty.t_dev; 360 if (tty.t_pgrp != NULL && 361 tty.t_pgrp != process.ps_pgrp && 362 KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 363 _kvm_err(kd, kd->program, 364 "can't read tpgrp at %lx", 365 (u_long)tty.t_pgrp); 366 return (-1); 367 } 368 kp.p_tpgid = tty.t_pgrp ? pgrp.pg_id : -1; 369 kp.p_tsess = PTRTOINT64(tty.t_session); 370 } else { 371 kp.p_tpgid = -1; 372 kp.p_tdev = NODEV; 373 } 374 } 375 376 memcpy(bp, &kp, esize); 377 bp += esize; 378 ++cnt; 379 #undef do_copy_str 380 } 381 return (cnt); 382 } 383 384 struct kinfo_proc * 385 kvm_getprocs(kvm_t *kd, int op, int arg, size_t esize, int *cnt) 386 { 387 int mib[6], st, nthreads; 388 void *procbase; 389 size_t size; 390 391 if ((ssize_t)esize < 0) 392 return (NULL); 393 394 if (ISALIVE(kd)) { 395 size = 0; 396 mib[0] = CTL_KERN; 397 mib[1] = KERN_PROC; 398 mib[2] = op; 399 mib[3] = arg; 400 mib[4] = esize; 401 402 do { 403 mib[5] = 0; 404 st = sysctl(mib, 6, NULL, &size, NULL, 0); 405 if (st == -1) { 406 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 407 return (NULL); 408 } 409 410 size += size / 8; /* add ~10% */ 411 412 procbase = _kvm_realloc(kd, kd->procbase, size); 413 if (procbase == NULL) 414 return (NULL); 415 416 kd->procbase = procbase; 417 418 mib[5] = size / esize; 419 st = sysctl(mib, 6, kd->procbase, &size, NULL, 0); 420 if (st == -1 && errno != ENOMEM) { 421 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 422 return (NULL); 423 } 424 } while (st == -1); 425 426 nthreads = size / esize; 427 } else { 428 struct nlist nl[5]; 429 int i, maxthread, maxprocess; 430 struct process *pr; 431 char *bp; 432 433 if (esize > sizeof(struct kinfo_proc)) { 434 _kvm_syserr(kd, kd->program, 435 "kvm_getprocs: unknown fields requested: libkvm out of date?"); 436 return (NULL); 437 } 438 439 memset(nl, 0, sizeof(nl)); 440 nl[0].n_name = "_nthreads"; 441 nl[1].n_name = "_nprocesses"; 442 nl[2].n_name = "_allprocess"; 443 nl[3].n_name = "_zombprocess"; 444 nl[4].n_name = NULL; 445 446 if (kvm_nlist(kd, nl) != 0) { 447 for (i = 0; nl[i].n_type != 0; ++i) 448 ; 449 _kvm_err(kd, kd->program, 450 "%s: no such symbol", nl[i].n_name); 451 return (NULL); 452 } 453 if (KREAD(kd, nl[0].n_value, &maxthread)) { 454 _kvm_err(kd, kd->program, "can't read nthreads"); 455 return (NULL); 456 } 457 if (KREAD(kd, nl[1].n_value, &maxprocess)) { 458 _kvm_err(kd, kd->program, "can't read nprocesses"); 459 return (NULL); 460 } 461 maxthread += maxprocess; 462 463 kd->procbase = _kvm_reallocarray(kd, NULL, maxthread, esize); 464 if (kd->procbase == 0) 465 return (NULL); 466 bp = (char *)kd->procbase; 467 468 /* allprocess */ 469 if (KREAD(kd, nl[2].n_value, &pr)) { 470 _kvm_err(kd, kd->program, "cannot read allprocess"); 471 return (NULL); 472 } 473 nthreads = kvm_proclist(kd, op, arg, pr, bp, maxthread, esize); 474 if (nthreads < 0) 475 return (NULL); 476 477 /* zombprocess */ 478 if (KREAD(kd, nl[3].n_value, &pr)) { 479 _kvm_err(kd, kd->program, "cannot read zombprocess"); 480 return (NULL); 481 } 482 i = kvm_proclist(kd, op, arg, pr, bp + (esize * nthreads), 483 maxthread - nthreads, esize); 484 if (i > 0) 485 nthreads += i; 486 } 487 if (kd->procbase != NULL) 488 *cnt = nthreads; 489 return (kd->procbase); 490 } 491