kvm_proc.c revision 1.27
1 /* $NetBSD: kvm_proc.c,v 1.27 1998/09/09 00:31:25 thorpej Exp $ */ 2 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /*- 40 * Copyright (c) 1989, 1992, 1993 41 * The Regents of the University of California. All rights reserved. 42 * 43 * This code is derived from software developed by the Computer Systems 44 * Engineering group at Lawrence Berkeley Laboratory under DARPA contract 45 * BG 91-66 and contributed to Berkeley. 46 * 47 * Redistribution and use in source and binary forms, with or without 48 * modification, are permitted provided that the following conditions 49 * are met: 50 * 1. Redistributions of source code must retain the above copyright 51 * notice, this list of conditions and the following disclaimer. 52 * 2. Redistributions in binary form must reproduce the above copyright 53 * notice, this list of conditions and the following disclaimer in the 54 * documentation and/or other materials provided with the distribution. 55 * 3. All advertising materials mentioning features or use of this software 56 * must display the following acknowledgement: 57 * This product includes software developed by the University of 58 * California, Berkeley and its contributors. 59 * 4. Neither the name of the University nor the names of its contributors 60 * may be used to endorse or promote products derived from this software 61 * without specific prior written permission. 62 * 63 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 64 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 65 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 66 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 67 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 68 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 69 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 70 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 71 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 72 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 73 * SUCH DAMAGE. 74 */ 75 76 #include <sys/cdefs.h> 77 #if defined(LIBC_SCCS) && !defined(lint) 78 #if 0 79 static char sccsid[] = "@(#)kvm_proc.c 8.3 (Berkeley) 9/23/93"; 80 #else 81 __RCSID("$NetBSD: kvm_proc.c,v 1.27 1998/09/09 00:31:25 thorpej Exp $"); 82 #endif 83 #endif /* LIBC_SCCS and not lint */ 84 85 /* 86 * Proc traversal interface for kvm. ps and w are (probably) the exclusive 87 * users of this code, so we've factored it out into a separate module. 88 * Thus, we keep this grunge out of the other kvm applications (i.e., 89 * most other applications are interested only in open/close/read/nlist). 90 */ 91 92 #include <sys/param.h> 93 #include <sys/user.h> 94 #include <sys/proc.h> 95 #include <sys/exec.h> 96 #include <sys/stat.h> 97 #include <sys/ioctl.h> 98 #include <sys/tty.h> 99 #include <stdlib.h> 100 #include <string.h> 101 #include <unistd.h> 102 #include <nlist.h> 103 #include <kvm.h> 104 105 #include <vm/vm.h> 106 #include <vm/vm_param.h> 107 #include <vm/swap_pager.h> 108 109 #if defined(UVM) 110 #include <uvm/uvm_extern.h> 111 #endif 112 113 #include <sys/sysctl.h> 114 115 #include <limits.h> 116 #include <db.h> 117 #include <paths.h> 118 119 #include "kvm_private.h" 120 121 #define KREAD(kd, addr, obj) \ 122 (kvm_read(kd, addr, (char *)(obj), sizeof(*obj)) != sizeof(*obj)) 123 124 char *_kvm_uread __P((kvm_t *, const struct proc *, u_long, u_long *)); 125 #if !defined(UVM) 126 int _kvm_coreinit __P((kvm_t *)); 127 int _kvm_readfromcore __P((kvm_t *, u_long, u_long)); 128 int _kvm_readfrompager __P((kvm_t *, struct vm_object *, u_long)); 129 #endif 130 ssize_t kvm_uread __P((kvm_t *, const struct proc *, u_long, char *, 131 size_t)); 132 133 static char **kvm_argv __P((kvm_t *, const struct proc *, u_long, int, 134 int)); 135 static int kvm_deadprocs __P((kvm_t *, int, int, u_long, u_long, u_long, 136 int)); 137 static char **kvm_doargv __P((kvm_t *, const struct kinfo_proc *, int, 138 void (*)(struct ps_strings *, u_long *, int *))); 139 static int kvm_proclist __P((kvm_t *, int, int, struct proc *, 140 struct kinfo_proc *, int)); 141 static int proc_verify __P((kvm_t *, u_long, const struct proc *)); 142 static void ps_str_a __P((struct ps_strings *, u_long *, int *)); 143 static void ps_str_e __P((struct ps_strings *, u_long *, int *)); 144 145 char * 146 _kvm_uread(kd, p, va, cnt) 147 kvm_t *kd; 148 const struct proc *p; 149 u_long va; 150 u_long *cnt; 151 { 152 u_long addr, head; 153 u_long offset; 154 struct vm_map_entry vme; 155 #if defined(UVM) 156 struct vm_amap amap; 157 struct vm_anon *anonp, anon; 158 struct vm_page pg; 159 int slot; 160 #else 161 struct vm_object vmo; 162 int rv; 163 #endif 164 165 if (kd->swapspc == 0) { 166 kd->swapspc = (char *)_kvm_malloc(kd, kd->nbpg); 167 if (kd->swapspc == 0) 168 return (0); 169 } 170 171 /* 172 * Look through the address map for the memory object 173 * that corresponds to the given virtual address. 174 * The header just has the entire valid range. 175 */ 176 head = (u_long)&p->p_vmspace->vm_map.header; 177 addr = head; 178 while (1) { 179 if (KREAD(kd, addr, &vme)) 180 return (0); 181 182 #if defined(UVM) 183 if (va >= vme.start && va < vme.end && 184 vme.aref.ar_amap != NULL) 185 break; 186 187 #else 188 if (va >= vme.start && va < vme.end && 189 vme.object.vm_object != 0) 190 break; 191 #endif 192 193 addr = (u_long)vme.next; 194 if (addr == head) 195 return (0); 196 197 } 198 #if defined(UVM) 199 200 /* 201 * we found the map entry, now to find the object... 202 */ 203 if (vme.aref.ar_amap == NULL) 204 return NULL; 205 206 addr = (u_long)vme.aref.ar_amap; 207 if (KREAD(kd, addr, &amap)) 208 return NULL; 209 210 offset = va - vme.start; 211 slot = offset / kd->nbpg + vme.aref.ar_slotoff; 212 /* sanity-check slot number */ 213 if (slot > amap.am_nslot) 214 return NULL; 215 216 addr = (u_long)amap.am_anon + (offset / kd->nbpg) * sizeof(anonp); 217 if (KREAD(kd, addr, &anonp)) 218 return NULL; 219 220 addr = (u_long)anonp; 221 if (KREAD(kd, addr, &anon)) 222 return NULL; 223 224 addr = (u_long)anon.u.an_page; 225 if (addr) { 226 if (KREAD(kd, addr, &pg)) 227 return NULL; 228 229 if (pread(kd->pmfd, kd->swapspc, kd->nbpg, 230 (off_t)pg.phys_addr) != kd->nbpg) 231 return NULL; 232 } 233 else { 234 if (pread(kd->swfd, kd->swapspc, kd->nbpg, 235 (off_t)(anon.an_swslot * kd->nbpg)) != kd->nbpg) 236 return NULL; 237 } 238 #else 239 /* 240 * We found the right object -- follow shadow links. 241 */ 242 offset = va - vme.start + vme.offset; 243 addr = (u_long)vme.object.vm_object; 244 245 while (1) { 246 /* Try reading the page from core first. */ 247 if ((rv = _kvm_readfromcore(kd, addr, offset))) 248 break; 249 250 if (KREAD(kd, addr, &vmo)) 251 return (0); 252 253 /* If there is a pager here, see if it has the page. */ 254 if (vmo.pager != 0 && 255 (rv = _kvm_readfrompager(kd, &vmo, offset))) 256 break; 257 258 /* Move down the shadow chain. */ 259 addr = (u_long)vmo.shadow; 260 if (addr == 0) 261 return (0); 262 offset += vmo.shadow_offset; 263 } 264 265 if (rv == -1) 266 return (0); 267 #endif 268 269 /* Found the page. */ 270 offset %= kd->nbpg; 271 *cnt = kd->nbpg - offset; 272 return (&kd->swapspc[offset]); 273 } 274 275 #if !defined(UVM) 276 277 #define vm_page_hash(kd, object, offset) \ 278 (((u_long)object + (u_long)(offset / kd->nbpg)) & kd->vm_page_hash_mask) 279 280 int 281 _kvm_coreinit(kd) 282 kvm_t *kd; 283 { 284 struct nlist nlist[3]; 285 286 nlist[0].n_name = "_vm_page_buckets"; 287 nlist[1].n_name = "_vm_page_hash_mask"; 288 nlist[2].n_name = 0; 289 if (kvm_nlist(kd, nlist) != 0) 290 return (-1); 291 292 if (KREAD(kd, nlist[0].n_value, &kd->vm_page_buckets) || 293 KREAD(kd, nlist[1].n_value, &kd->vm_page_hash_mask)) 294 return (-1); 295 296 return (0); 297 } 298 299 int 300 _kvm_readfromcore(kd, object, offset) 301 kvm_t *kd; 302 u_long object, offset; 303 { 304 u_long addr; 305 struct pglist bucket; 306 struct vm_page mem; 307 off_t seekpoint; 308 309 if (kd->vm_page_buckets == 0 && 310 _kvm_coreinit(kd)) 311 return (-1); 312 313 addr = (u_long)&kd->vm_page_buckets[vm_page_hash(kd, object, offset)]; 314 if (KREAD(kd, addr, &bucket)) 315 return (-1); 316 317 addr = (u_long)bucket.tqh_first; 318 offset &= ~(kd->nbpg -1); 319 while (1) { 320 if (addr == 0) 321 return (0); 322 323 if (KREAD(kd, addr, &mem)) 324 return (-1); 325 326 if ((u_long)mem.object == object && 327 (u_long)mem.offset == offset) 328 break; 329 330 addr = (u_long)mem.hashq.tqe_next; 331 } 332 333 seekpoint = mem.phys_addr; 334 335 if (pread(kd->pmfd, kd->swapspc, kd->nbpg, seekpoint) != kd->nbpg) 336 return (-1); 337 338 return (1); 339 } 340 341 int 342 _kvm_readfrompager(kd, vmop, offset) 343 kvm_t *kd; 344 struct vm_object *vmop; 345 u_long offset; 346 { 347 u_long addr; 348 struct pager_struct pager; 349 struct swpager swap; 350 int ix; 351 struct swblock swb; 352 off_t seekpoint; 353 354 /* Read in the pager info and make sure it's a swap device. */ 355 addr = (u_long)vmop->pager; 356 if (KREAD(kd, addr, &pager) || pager.pg_type != PG_SWAP) 357 return (-1); 358 359 /* Read in the swap_pager private data. */ 360 addr = (u_long)pager.pg_data; 361 if (KREAD(kd, addr, &swap)) 362 return (-1); 363 364 /* 365 * Calculate the paging offset, and make sure it's within the 366 * bounds of the pager. 367 */ 368 offset += vmop->paging_offset; 369 ix = offset / dbtob(swap.sw_bsize); 370 #if 0 371 if (swap.sw_blocks == 0 || ix >= swap.sw_nblocks) 372 return (-1); 373 #else 374 if (swap.sw_blocks == 0 || ix >= swap.sw_nblocks) { 375 int i; 376 printf("BUG BUG BUG BUG:\n"); 377 printf("object %p offset %lx pgoffset %lx ", 378 vmop, offset - vmop->paging_offset, 379 (u_long)vmop->paging_offset); 380 printf("pager %p swpager %p\n", 381 vmop->pager, pager.pg_data); 382 printf("osize %lx bsize %x blocks %p nblocks %x\n", 383 (u_long)swap.sw_osize, swap.sw_bsize, swap.sw_blocks, 384 swap.sw_nblocks); 385 for (i = 0; i < swap.sw_nblocks; i++) { 386 addr = (u_long)&swap.sw_blocks[i]; 387 if (KREAD(kd, addr, &swb)) 388 return (0); 389 printf("sw_blocks[%d]: block %x mask %x\n", i, 390 swb.swb_block, swb.swb_mask); 391 } 392 return (-1); 393 } 394 #endif 395 396 /* Read in the swap records. */ 397 addr = (u_long)&swap.sw_blocks[ix]; 398 if (KREAD(kd, addr, &swb)) 399 return (-1); 400 401 /* Calculate offset within pager. */ 402 offset %= dbtob(swap.sw_bsize); 403 404 /* Check that the page is actually present. */ 405 if ((swb.swb_mask & (1 << (offset / kd->nbpg))) == 0) 406 return (0); 407 408 if (!ISALIVE(kd)) 409 return (-1); 410 411 /* Calculate the physical address and read the page. */ 412 seekpoint = dbtob(swb.swb_block) + (offset & ~(kd->nbpg -1)); 413 414 if (pread(kd->swfd, kd->swapspc, kd->nbpg, seekpoint) != kd->nbpg) 415 return (-1); 416 417 return (1); 418 } 419 #endif /* !defined(UVM) */ 420 421 /* 422 * Read proc's from memory file into buffer bp, which has space to hold 423 * at most maxcnt procs. 424 */ 425 static int 426 kvm_proclist(kd, what, arg, p, bp, maxcnt) 427 kvm_t *kd; 428 int what, arg; 429 struct proc *p; 430 struct kinfo_proc *bp; 431 int maxcnt; 432 { 433 int cnt = 0; 434 struct eproc eproc; 435 struct pgrp pgrp; 436 struct session sess; 437 struct tty tty; 438 struct proc proc; 439 440 for (; cnt < maxcnt && p != NULL; p = proc.p_list.le_next) { 441 if (KREAD(kd, (u_long)p, &proc)) { 442 _kvm_err(kd, kd->program, "can't read proc at %x", p); 443 return (-1); 444 } 445 if (KREAD(kd, (u_long)proc.p_cred, &eproc.e_pcred) == 0) 446 (void)KREAD(kd, (u_long)eproc.e_pcred.pc_ucred, 447 &eproc.e_ucred); 448 449 switch(what) { 450 451 case KERN_PROC_PID: 452 if (proc.p_pid != (pid_t)arg) 453 continue; 454 break; 455 456 case KERN_PROC_UID: 457 if (eproc.e_ucred.cr_uid != (uid_t)arg) 458 continue; 459 break; 460 461 case KERN_PROC_RUID: 462 if (eproc.e_pcred.p_ruid != (uid_t)arg) 463 continue; 464 break; 465 } 466 /* 467 * We're going to add another proc to the set. If this 468 * will overflow the buffer, assume the reason is because 469 * nprocs (or the proc list) is corrupt and declare an error. 470 */ 471 if (cnt >= maxcnt) { 472 _kvm_err(kd, kd->program, "nprocs corrupt"); 473 return (-1); 474 } 475 /* 476 * gather eproc 477 */ 478 eproc.e_paddr = p; 479 if (KREAD(kd, (u_long)proc.p_pgrp, &pgrp)) { 480 _kvm_err(kd, kd->program, "can't read pgrp at %x", 481 proc.p_pgrp); 482 return (-1); 483 } 484 eproc.e_sess = pgrp.pg_session; 485 eproc.e_pgid = pgrp.pg_id; 486 eproc.e_jobc = pgrp.pg_jobc; 487 if (KREAD(kd, (u_long)pgrp.pg_session, &sess)) { 488 _kvm_err(kd, kd->program, "can't read session at %x", 489 pgrp.pg_session); 490 return (-1); 491 } 492 if ((proc.p_flag & P_CONTROLT) && sess.s_ttyp != NULL) { 493 if (KREAD(kd, (u_long)sess.s_ttyp, &tty)) { 494 _kvm_err(kd, kd->program, 495 "can't read tty at %x", sess.s_ttyp); 496 return (-1); 497 } 498 eproc.e_tdev = tty.t_dev; 499 eproc.e_tsess = tty.t_session; 500 if (tty.t_pgrp != NULL) { 501 if (KREAD(kd, (u_long)tty.t_pgrp, &pgrp)) { 502 _kvm_err(kd, kd->program, 503 "can't read tpgrp at &x", 504 tty.t_pgrp); 505 return (-1); 506 } 507 eproc.e_tpgid = pgrp.pg_id; 508 } else 509 eproc.e_tpgid = -1; 510 } else 511 eproc.e_tdev = NODEV; 512 eproc.e_flag = sess.s_ttyvp ? EPROC_CTTY : 0; 513 if (sess.s_leader == p) 514 eproc.e_flag |= EPROC_SLEADER; 515 if (proc.p_wmesg) 516 (void)kvm_read(kd, (u_long)proc.p_wmesg, 517 eproc.e_wmesg, WMESGLEN); 518 519 (void)kvm_read(kd, (u_long)proc.p_vmspace, 520 (char *)&eproc.e_vm, sizeof(eproc.e_vm)); 521 522 eproc.e_xsize = eproc.e_xrssize = 0; 523 eproc.e_xccount = eproc.e_xswrss = 0; 524 525 switch (what) { 526 527 case KERN_PROC_PGRP: 528 if (eproc.e_pgid != (pid_t)arg) 529 continue; 530 break; 531 532 case KERN_PROC_TTY: 533 if ((proc.p_flag & P_CONTROLT) == 0 || 534 eproc.e_tdev != (dev_t)arg) 535 continue; 536 break; 537 } 538 memcpy(&bp->kp_proc, &proc, sizeof(proc)); 539 memcpy(&bp->kp_eproc, &eproc, sizeof(eproc)); 540 ++bp; 541 ++cnt; 542 } 543 return (cnt); 544 } 545 546 /* 547 * Build proc info array by reading in proc list from a crash dump. 548 * Return number of procs read. maxcnt is the max we will read. 549 */ 550 static int 551 kvm_deadprocs(kd, what, arg, a_allproc, a_deadproc, a_zombproc, maxcnt) 552 kvm_t *kd; 553 int what, arg; 554 u_long a_allproc; 555 u_long a_deadproc; 556 u_long a_zombproc; 557 int maxcnt; 558 { 559 struct kinfo_proc *bp = kd->procbase; 560 int acnt, dcnt, zcnt; 561 struct proc *p; 562 563 if (KREAD(kd, a_allproc, &p)) { 564 _kvm_err(kd, kd->program, "cannot read allproc"); 565 return (-1); 566 } 567 acnt = kvm_proclist(kd, what, arg, p, bp, maxcnt); 568 if (acnt < 0) 569 return (acnt); 570 571 if (KREAD(kd, a_deadproc, &p)) { 572 _kvm_err(kd, kd->program, "cannot read deadproc"); 573 return (-1); 574 } 575 576 dcnt = kvm_proclist(kd, what, arg, p, bp, maxcnt - acnt); 577 if (dcnt < 0) 578 dcnt = 0; 579 580 if (KREAD(kd, a_zombproc, &p)) { 581 _kvm_err(kd, kd->program, "cannot read zombproc"); 582 return (-1); 583 } 584 zcnt = kvm_proclist(kd, what, arg, p, bp + acnt, 585 maxcnt - (acnt + dcnt)); 586 if (zcnt < 0) 587 zcnt = 0; 588 589 return (acnt + zcnt); 590 } 591 592 struct kinfo_proc * 593 kvm_getprocs(kd, op, arg, cnt) 594 kvm_t *kd; 595 int op, arg; 596 int *cnt; 597 { 598 size_t size; 599 int mib[4], st, nprocs; 600 601 if (kd->procbase != 0) { 602 free((void *)kd->procbase); 603 /* 604 * Clear this pointer in case this call fails. Otherwise, 605 * kvm_close() will free it again. 606 */ 607 kd->procbase = 0; 608 } 609 if (ISALIVE(kd)) { 610 size = 0; 611 mib[0] = CTL_KERN; 612 mib[1] = KERN_PROC; 613 mib[2] = op; 614 mib[3] = arg; 615 st = sysctl(mib, 4, NULL, &size, NULL, 0); 616 if (st == -1) { 617 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 618 return (0); 619 } 620 kd->procbase = (struct kinfo_proc *)_kvm_malloc(kd, size); 621 if (kd->procbase == 0) 622 return (0); 623 st = sysctl(mib, 4, kd->procbase, &size, NULL, 0); 624 if (st == -1) { 625 _kvm_syserr(kd, kd->program, "kvm_getprocs"); 626 return (0); 627 } 628 if (size % sizeof(struct kinfo_proc) != 0) { 629 _kvm_err(kd, kd->program, 630 "proc size mismatch (%d total, %d chunks)", 631 size, sizeof(struct kinfo_proc)); 632 return (0); 633 } 634 nprocs = size / sizeof(struct kinfo_proc); 635 } else { 636 struct nlist nl[5], *p; 637 638 nl[0].n_name = "_nprocs"; 639 nl[1].n_name = "_allproc"; 640 nl[2].n_name = "_deadproc"; 641 nl[3].n_name = "_zombproc"; 642 nl[4].n_name = 0; 643 644 if (kvm_nlist(kd, nl) != 0) { 645 for (p = nl; p->n_type != 0; ++p) 646 ; 647 _kvm_err(kd, kd->program, 648 "%s: no such symbol", p->n_name); 649 return (0); 650 } 651 if (KREAD(kd, nl[0].n_value, &nprocs)) { 652 _kvm_err(kd, kd->program, "can't read nprocs"); 653 return (0); 654 } 655 size = nprocs * sizeof(struct kinfo_proc); 656 kd->procbase = (struct kinfo_proc *)_kvm_malloc(kd, size); 657 if (kd->procbase == 0) 658 return (0); 659 660 nprocs = kvm_deadprocs(kd, op, arg, nl[1].n_value, 661 nl[2].n_value, nl[3].n_value, nprocs); 662 #ifdef notdef 663 size = nprocs * sizeof(struct kinfo_proc); 664 (void)realloc(kd->procbase, size); 665 #endif 666 } 667 *cnt = nprocs; 668 return (kd->procbase); 669 } 670 671 void 672 _kvm_freeprocs(kd) 673 kvm_t *kd; 674 { 675 if (kd->procbase) { 676 free(kd->procbase); 677 kd->procbase = 0; 678 } 679 } 680 681 void * 682 _kvm_realloc(kd, p, n) 683 kvm_t *kd; 684 void *p; 685 size_t n; 686 { 687 void *np = (void *)realloc(p, n); 688 689 if (np == 0) 690 _kvm_err(kd, kd->program, "out of memory"); 691 return (np); 692 } 693 694 #ifndef MAX 695 #define MAX(a, b) ((a) > (b) ? (a) : (b)) 696 #endif 697 698 /* 699 * Read in an argument vector from the user address space of process p. 700 * addr if the user-space base address of narg null-terminated contiguous 701 * strings. This is used to read in both the command arguments and 702 * environment strings. Read at most maxcnt characters of strings. 703 */ 704 static char ** 705 kvm_argv(kd, p, addr, narg, maxcnt) 706 kvm_t *kd; 707 const struct proc *p; 708 u_long addr; 709 int narg; 710 int maxcnt; 711 { 712 char *np, *cp, *ep, *ap; 713 u_long oaddr = -1; 714 int len, cc; 715 char **argv; 716 717 /* 718 * Check that there aren't an unreasonable number of agruments, 719 * and that the address is in user space. 720 */ 721 if (narg > ARG_MAX || addr < kd->min_uva || addr >= kd->max_uva) 722 return (0); 723 724 if (kd->argv == 0) { 725 /* 726 * Try to avoid reallocs. 727 */ 728 kd->argc = MAX(narg + 1, 32); 729 kd->argv = (char **)_kvm_malloc(kd, kd->argc * 730 sizeof(*kd->argv)); 731 if (kd->argv == 0) 732 return (0); 733 } else if (narg + 1 > kd->argc) { 734 kd->argc = MAX(2 * kd->argc, narg + 1); 735 kd->argv = (char **)_kvm_realloc(kd, kd->argv, kd->argc * 736 sizeof(*kd->argv)); 737 if (kd->argv == 0) 738 return (0); 739 } 740 if (kd->argspc == 0) { 741 kd->argspc = (char *)_kvm_malloc(kd, kd->nbpg); 742 if (kd->argspc == 0) 743 return (0); 744 kd->arglen = kd->nbpg; 745 } 746 if (kd->argbuf == 0) { 747 kd->argbuf = (char *)_kvm_malloc(kd, kd->nbpg); 748 if (kd->argbuf == 0) 749 return (0); 750 } 751 cc = sizeof(char *) * narg; 752 if (kvm_uread(kd, p, addr, (char *)kd->argv, cc) != cc) 753 return (0); 754 ap = np = kd->argspc; 755 argv = kd->argv; 756 len = 0; 757 /* 758 * Loop over pages, filling in the argument vector. 759 */ 760 while (argv < kd->argv + narg && *argv != 0) { 761 addr = (u_long)*argv & ~(kd->nbpg - 1); 762 if (addr != oaddr) { 763 if (kvm_uread(kd, p, addr, kd->argbuf, kd->nbpg) != 764 kd->nbpg) 765 return (0); 766 oaddr = addr; 767 } 768 addr = (u_long)*argv & (kd->nbpg - 1); 769 cp = kd->argbuf + addr; 770 cc = kd->nbpg - addr; 771 if (maxcnt > 0 && cc > maxcnt - len) 772 cc = maxcnt - len;; 773 ep = memchr(cp, '\0', cc); 774 if (ep != 0) 775 cc = ep - cp + 1; 776 if (len + cc > kd->arglen) { 777 int off; 778 char **pp; 779 char *op = kd->argspc; 780 781 kd->arglen *= 2; 782 kd->argspc = (char *)_kvm_realloc(kd, kd->argspc, 783 kd->arglen); 784 if (kd->argspc == 0) 785 return (0); 786 /* 787 * Adjust argv pointers in case realloc moved 788 * the string space. 789 */ 790 off = kd->argspc - op; 791 for (pp = kd->argv; pp < argv; pp++) 792 *pp += off; 793 ap += off; 794 np += off; 795 } 796 memcpy(np, cp, cc); 797 np += cc; 798 len += cc; 799 if (ep != 0) { 800 *argv++ = ap; 801 ap = np; 802 } else 803 *argv += cc; 804 if (maxcnt > 0 && len >= maxcnt) { 805 /* 806 * We're stopping prematurely. Terminate the 807 * current string. 808 */ 809 if (ep == 0) { 810 *np = '\0'; 811 *argv++ = ap; 812 } 813 break; 814 } 815 } 816 /* Make sure argv is terminated. */ 817 *argv = 0; 818 return (kd->argv); 819 } 820 821 static void 822 ps_str_a(p, addr, n) 823 struct ps_strings *p; 824 u_long *addr; 825 int *n; 826 { 827 *addr = (u_long)p->ps_argvstr; 828 *n = p->ps_nargvstr; 829 } 830 831 static void 832 ps_str_e(p, addr, n) 833 struct ps_strings *p; 834 u_long *addr; 835 int *n; 836 { 837 *addr = (u_long)p->ps_envstr; 838 *n = p->ps_nenvstr; 839 } 840 841 /* 842 * Determine if the proc indicated by p is still active. 843 * This test is not 100% foolproof in theory, but chances of 844 * being wrong are very low. 845 */ 846 static int 847 proc_verify(kd, kernp, p) 848 kvm_t *kd; 849 u_long kernp; 850 const struct proc *p; 851 { 852 struct proc kernproc; 853 854 /* 855 * Just read in the whole proc. It's not that big relative 856 * to the cost of the read system call. 857 */ 858 if (kvm_read(kd, kernp, (char *)&kernproc, sizeof(kernproc)) != 859 sizeof(kernproc)) 860 return (0); 861 return (p->p_pid == kernproc.p_pid && 862 (kernproc.p_stat != SZOMB || p->p_stat == SZOMB)); 863 } 864 865 static char ** 866 kvm_doargv(kd, kp, nchr, info) 867 kvm_t *kd; 868 const struct kinfo_proc *kp; 869 int nchr; 870 void (*info)(struct ps_strings *, u_long *, int *); 871 { 872 const struct proc *p = &kp->kp_proc; 873 char **ap; 874 u_long addr; 875 int cnt; 876 struct ps_strings arginfo; 877 878 /* 879 * Pointers are stored at the top of the user stack. 880 */ 881 if (p->p_stat == SZOMB) 882 return (0); 883 cnt = kvm_uread(kd, p, kd->usrstack - sizeof(arginfo), 884 (char *)&arginfo, sizeof(arginfo)); 885 if (cnt != sizeof(arginfo)) 886 return (0); 887 888 (*info)(&arginfo, &addr, &cnt); 889 if (cnt == 0) 890 return (0); 891 ap = kvm_argv(kd, p, addr, cnt, nchr); 892 /* 893 * For live kernels, make sure this process didn't go away. 894 */ 895 if (ap != 0 && ISALIVE(kd) && 896 !proc_verify(kd, (u_long)kp->kp_eproc.e_paddr, p)) 897 ap = 0; 898 return (ap); 899 } 900 901 /* 902 * Get the command args. This code is now machine independent. 903 */ 904 char ** 905 kvm_getargv(kd, kp, nchr) 906 kvm_t *kd; 907 const struct kinfo_proc *kp; 908 int nchr; 909 { 910 return (kvm_doargv(kd, kp, nchr, ps_str_a)); 911 } 912 913 char ** 914 kvm_getenvv(kd, kp, nchr) 915 kvm_t *kd; 916 const struct kinfo_proc *kp; 917 int nchr; 918 { 919 return (kvm_doargv(kd, kp, nchr, ps_str_e)); 920 } 921 922 /* 923 * Read from user space. The user context is given by p. 924 */ 925 ssize_t 926 kvm_uread(kd, p, uva, buf, len) 927 kvm_t *kd; 928 const struct proc *p; 929 u_long uva; 930 char *buf; 931 size_t len; 932 { 933 char *cp; 934 935 cp = buf; 936 while (len > 0) { 937 int cc; 938 char *dp; 939 u_long cnt; 940 941 dp = _kvm_uread(kd, p, uva, &cnt); 942 if (dp == 0) { 943 _kvm_err(kd, 0, "invalid address (%x)", uva); 944 return (0); 945 } 946 cc = MIN(cnt, len); 947 memcpy(cp, dp, cc); 948 949 cp += cc; 950 uva += cc; 951 len -= cc; 952 } 953 return (ssize_t)(cp - buf); 954 } 955
Indexes created Wed Sep 24 22:09:59 GMT 2025