1 /* $OpenBSD: kvm_proc2.c,v 1.27 2016/11/07 00:26:33 guenther 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 <stddef.h> 84 #include <stdlib.h> 85 #include <string.h> 86 #include <unistd.h> 87 #include <nlist.h> 88 #include <kvm.h> 89 90 #include <uvm/uvm_extern.h> 91 #include <uvm/uvm_amap.h> 92 #include <machine/vmparam.h> 93 #include <machine/pmap.h> 94 95 #include <sys/sysctl.h> 96 97 #include <limits.h> 98 #include <errno.h> 99 #include <db.h> 100 #include <paths.h> 101 102 #include "kvm_private.h" 103 104 /* 105 * Read proc's from memory file into buffer bp, which has space to hold 106 * at most maxcnt procs. 107 */ 108 static int 109 kvm_proclist(kvm_t *kd, int op, int arg, struct process *pr, 110 char *bp, int maxcnt, size_t esize) 111 { 112 struct kinfo_proc kp; 113 struct session sess; 114 struct ucred ucred; 115 struct proc proc, *p; 116 struct process process, process2; 117 struct pgrp pgrp; 118 struct tty tty; 119 struct sigacts sa, *sap; 120 struct vmspace vm, *vmp; 121 struct plimit limits, *limp; 122 pid_t parent_pid, leader_pid; 123 int cnt = 0; 124 int dothreads = 0; 125 126 dothreads = op & KERN_PROC_SHOW_THREADS; 127 op &= ~KERN_PROC_SHOW_THREADS; 128 129 /* 130 * Modelled on sysctl_doproc() in sys/kern/kern_sysctl.c 131 */ 132 for (; cnt < maxcnt && pr != NULL; pr = LIST_NEXT(&process, ps_list)) { 133 if (KREAD(kd, (u_long)pr, &process)) { 134 _kvm_err(kd, kd->program, "can't read process at %lx", 135 (u_long)pr); 136 return (-1); 137 } 138 if (process.ps_pgrp == NULL) 139 continue; 140 if (process.ps_flags & PS_EMBRYO) 141 continue; 142 if (KREAD(kd, (u_long)process.ps_ucred, &ucred)) { 143 _kvm_err(kd, kd->program, "can't read ucred at %lx", 144 (u_long)process.ps_ucred); 145 return (-1); 146 } 147 if (KREAD(kd, (u_long)process.ps_pgrp, &pgrp)) { 148 _kvm_err(kd, kd->program, "can't read pgrp at %lx", 149 (u_long)process.ps_pgrp); 150 return (-1); 151 } 152 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) { 153 _kvm_err(kd, kd->program, "can't read session at %lx", 154 (u_long)pgrp.pg_session); 155 return (-1); 156 } 157 if ((process.ps_flags & PS_CONTROLT) && sess.s_ttyp != NULL && 158 KREAD(kd, (u_long)sess.s_ttyp, &tty)) { 159 _kvm_err(kd, kd->program, "can't read tty at %lx", 160 (u_long)sess.s_ttyp); 161 return (-1); 162 } 163 if (process.ps_pptr) { 164 if (KREAD(kd, (u_long)process.ps_pptr, &process2)) { 165 _kvm_err(kd, kd->program, 166 "can't read process at %lx", 167 (u_long)process.ps_pptr); 168 return (-1); 169 } 170 parent_pid = process2.ps_pid; 171 } 172 else 173 parent_pid = 0; 174 if (sess.s_leader) { 175 if (KREAD(kd, (u_long)sess.s_leader, &process2)) { 176 _kvm_err(kd, kd->program, 177 "can't read proc at %lx", 178 (u_long)sess.s_leader); 179 return (-1); 180 } 181 leader_pid = process2.ps_pid; 182 } 183 else 184 leader_pid = 0; 185 if (process.ps_sigacts) { 186 if (KREAD(kd, (u_long)process.ps_sigacts, &sa)) { 187 _kvm_err(kd, kd->program, 188 "can't read sigacts at %lx", 189 (u_long)process.ps_sigacts); 190 return (-1); 191 } 192 sap = &sa; 193 } 194 else 195 sap = NULL; 196 197 switch (op) { 198 case KERN_PROC_PID: 199 if (parent_pid != (pid_t)arg) 200 continue; 201 break; 202 203 case KERN_PROC_PGRP: 204 if (pgrp.pg_id != (pid_t)arg) 205 continue; 206 break; 207 208 case KERN_PROC_SESSION: 209 if (sess.s_leader == NULL || 210 leader_pid != (pid_t)arg) 211 continue; 212 break; 213 214 case KERN_PROC_TTY: 215 if ((process.ps_flags & PS_CONTROLT) == 0 || 216 sess.s_ttyp == NULL || 217 tty.t_dev != (dev_t)arg) 218 continue; 219 break; 220 221 case KERN_PROC_UID: 222 if (ucred.cr_uid != (uid_t)arg) 223 continue; 224 break; 225 226 case KERN_PROC_RUID: 227 if (ucred.cr_ruid != (uid_t)arg) 228 continue; 229 break; 230 231 case KERN_PROC_ALL: 232 if (process.ps_flags & PS_SYSTEM) 233 continue; 234 break; 235 236 case KERN_PROC_KTHREAD: 237 /* no filtering */ 238 break; 239 240 default: 241 _kvm_err(kd, kd->program, "invalid filter"); 242 return (-1); 243 } 244 245 /* 246 * We're going to add another proc to the set. If this 247 * will overflow the buffer, assume the reason is because 248 * nthreads (or the proc list) is corrupt and declare an error. 249 */ 250 if (cnt >= maxcnt) { 251 _kvm_err(kd, kd->program, "nthreads corrupt"); 252 return (-1); 253 } 254 255 /* set up stuff that might not always be there */ 256 limp = &limits; 257 if (!process.ps_limit || 258 KREAD(kd, (u_long)process.ps_limit, &limits)) 259 limp = NULL; 260 261 vmp = NULL; 262 263 if ((process.ps_flags & PS_ZOMBIE) == 0 && 264 !KREAD(kd, (u_long)process.ps_vmspace, &vm)) 265 vmp = &vm; 266 267 #define do_copy_str(_d, _s, _l) kvm_read(kd, (u_long)(_s), (_d), (_l)-1) 268 FILL_KPROC(&kp, do_copy_str, &proc, &process, 269 &ucred, &pgrp, process.ps_mainproc, pr, &sess, 270 vmp, limp, sap, 0, 1); 271 272 /* stuff that's too painful to generalize */ 273 kp.p_ppid = parent_pid; 274 kp.p_sid = leader_pid; 275 if ((process.ps_flags & PS_CONTROLT) && sess.s_ttyp != NULL) { 276 kp.p_tdev = tty.t_dev; 277 if (tty.t_pgrp != NULL && 278 tty.t_pgrp != process.ps_pgrp && 279 KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 280 _kvm_err(kd, kd->program, 281 "can't read tpgrp at %lx", 282 (u_long)tty.t_pgrp); 283 return (-1); 284 } 285 kp.p_tpgid = tty.t_pgrp ? pgrp.pg_id : -1; 286 kp.p_tsess = PTRTOINT64(tty.t_session); 287 } else { 288 kp.p_tpgid = -1; 289 kp.p_tdev = NODEV; 290 } 291 292 /* update %cpu for all threads */ 293 if (dothreads) { 294 if (KREAD(kd, (u_long)process.ps_mainproc, &proc)) { 295 _kvm_err(kd, kd->program, 296 "can't read proc at %lx", 297 (u_long)process.ps_mainproc); 298 return (-1); 299 } 300 kp.p_pctcpu = proc.p_pctcpu; 301 kp.p_stat = proc.p_stat; 302 } else { 303 kp.p_pctcpu = 0; 304 kp.p_stat = (process.ps_flags & PS_ZOMBIE) ? SDEAD : 305 SIDL; 306 for (p = TAILQ_FIRST(&process.ps_threads); p != NULL; 307 p = TAILQ_NEXT(&proc, p_thr_link)) { 308 if (KREAD(kd, (u_long)p, &proc)) { 309 _kvm_err(kd, kd->program, 310 "can't read proc at %lx", 311 (u_long)p); 312 return (-1); 313 } 314 kp.p_pctcpu += proc.p_pctcpu; 315 /* 316 * find best state: 317 * ONPROC > RUN > STOP > SLEEP > ... 318 */ 319 if (proc.p_stat == SONPROC || 320 kp.p_stat == SONPROC) 321 kp.p_stat = SONPROC; 322 else if (proc.p_stat == SRUN || 323 kp.p_stat == SRUN) 324 kp.p_stat = SRUN; 325 else if (proc.p_stat == SSTOP || 326 kp.p_stat == SSTOP) 327 kp.p_stat = SSTOP; 328 else if (proc.p_stat == SSLEEP) 329 kp.p_stat = SSLEEP; 330 } 331 } 332 333 memcpy(bp, &kp, esize); 334 bp += esize; 335 ++cnt; 336 337 /* Skip per-thread entries if not required by op */ 338 if (!dothreads) 339 continue; 340 341 for (p = TAILQ_FIRST(&process.ps_threads); p != NULL; 342 p = TAILQ_NEXT(&proc, p_thr_link)) { 343 if (KREAD(kd, (u_long)p, &proc)) { 344 _kvm_err(kd, kd->program, 345 "can't read proc at %lx", 346 (u_long)p); 347 return (-1); 348 } 349 FILL_KPROC(&kp, do_copy_str, &proc, &process, 350 &ucred, &pgrp, p, pr, &sess, vmp, limp, sap, 351 1, 1); 352 353 /* see above */ 354 kp.p_ppid = parent_pid; 355 kp.p_sid = leader_pid; 356 if ((process.ps_flags & PS_CONTROLT) && 357 sess.s_ttyp != NULL) { 358 kp.p_tdev = tty.t_dev; 359 if (tty.t_pgrp != NULL && 360 tty.t_pgrp != process.ps_pgrp && 361 KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 362 _kvm_err(kd, kd->program, 363 "can't read tpgrp at %lx", 364 (u_long)tty.t_pgrp); 365 return (-1); 366 } 367 kp.p_tpgid = tty.t_pgrp ? pgrp.pg_id : -1; 368 kp.p_tsess = PTRTOINT64(tty.t_session); 369 } else { 370 kp.p_tpgid = -1; 371 kp.p_tdev = NODEV; 372 } 373 } 374 375 memcpy(bp, &kp, esize); 376 bp += esize; 377 ++cnt; 378 #undef do_copy_str 379 } 380 return (cnt); 381 } 382 383 struct kinfo_proc * 384 kvm_getprocs(kvm_t *kd, int op, int arg, size_t esize, int *cnt) 385 { 386 int mib[6], st, nthreads; 387 void *procbase; 388 size_t size; 389 390 if ((ssize_t)esize < 0) 391 return (NULL); 392 393 if (ISALIVE(kd)) { 394 size = 0; 395 mib[0] = CTL_KERN; 396 mib[1] = KERN_PROC; 397 mib[2] = op; 398 mib[3] = arg; 399 mib[4] = esize; 400 401 do { 402 mib[5] = 0; 403 st = sysctl(mib, 6, NULL, &size, NULL, 0); 404 if (st == -1) { 405 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 406 return (NULL); 407 } 408 409 size += size / 8; /* add ~10% */ 410 411 procbase = _kvm_realloc(kd, kd->procbase, size); 412 if (procbase == NULL) 413 return (NULL); 414 415 kd->procbase = procbase; 416 417 mib[5] = size / esize; 418 st = sysctl(mib, 6, kd->procbase, &size, NULL, 0); 419 if (st == -1 && errno != ENOMEM) { 420 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 421 return (NULL); 422 } 423 } while (st == -1); 424 425 nthreads = size / esize; 426 } else { 427 struct nlist nl[5]; 428 int i, maxthread, maxprocess; 429 struct process *pr; 430 char *bp; 431 432 if (esize > sizeof(struct kinfo_proc)) { 433 _kvm_syserr(kd, kd->program, 434 "kvm_getprocs: unknown fields requested: libkvm out of date?"); 435 return (NULL); 436 } 437 438 memset(nl, 0, sizeof(nl)); 439 nl[0].n_name = "_nthreads"; 440 nl[1].n_name = "_nprocesses"; 441 nl[2].n_name = "_allprocess"; 442 nl[3].n_name = "_zombprocess"; 443 nl[4].n_name = NULL; 444 445 if (kvm_nlist(kd, nl) != 0) { 446 for (i = 0; nl[i].n_type != 0; ++i) 447 ; 448 _kvm_err(kd, kd->program, 449 "%s: no such symbol", nl[i].n_name); 450 return (NULL); 451 } 452 if (KREAD(kd, nl[0].n_value, &maxthread)) { 453 _kvm_err(kd, kd->program, "can't read nthreads"); 454 return (NULL); 455 } 456 if (KREAD(kd, nl[1].n_value, &maxprocess)) { 457 _kvm_err(kd, kd->program, "can't read nprocesses"); 458 return (NULL); 459 } 460 maxthread += maxprocess; 461 462 kd->procbase = _kvm_reallocarray(kd, NULL, maxthread, esize); 463 if (kd->procbase == 0) 464 return (NULL); 465 bp = (char *)kd->procbase; 466 467 /* allprocess */ 468 if (KREAD(kd, nl[2].n_value, &pr)) { 469 _kvm_err(kd, kd->program, "cannot read allprocess"); 470 return (NULL); 471 } 472 nthreads = kvm_proclist(kd, op, arg, pr, bp, maxthread, esize); 473 if (nthreads < 0) 474 return (NULL); 475 476 /* zombprocess */ 477 if (KREAD(kd, nl[3].n_value, &pr)) { 478 _kvm_err(kd, kd->program, "cannot read zombprocess"); 479 return (NULL); 480 } 481 i = kvm_proclist(kd, op, arg, pr, bp + (esize * nthreads), 482 maxthread - nthreads, esize); 483 if (i > 0) 484 nthreads += i; 485 } 486 if (kd->procbase != NULL) 487 *cnt = nthreads; 488 return (kd->procbase); 489 } 490