kern_proc.c revision 330897
1/*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1991, 1993 5 * The Regents of the University of California. All rights reserved. 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 * 4. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)kern_proc.c 8.7 (Berkeley) 2/14/95 32 */ 33 34#include <sys/cdefs.h> 35__FBSDID("$FreeBSD: stable/11/sys/kern/kern_proc.c 330897 2018-03-14 03:19:51Z eadler $"); 36 37#include "opt_compat.h" 38#include "opt_ddb.h" 39#include "opt_ktrace.h" 40#include "opt_kstack_pages.h" 41#include "opt_stack.h" 42 43#include <sys/param.h> 44#include <sys/systm.h> 45#include <sys/elf.h> 46#include <sys/eventhandler.h> 47#include <sys/exec.h> 48#include <sys/jail.h> 49#include <sys/kernel.h> 50#include <sys/limits.h> 51#include <sys/lock.h> 52#include <sys/loginclass.h> 53#include <sys/malloc.h> 54#include <sys/mman.h> 55#include <sys/mount.h> 56#include <sys/mutex.h> 57#include <sys/proc.h> 58#include <sys/ptrace.h> 59#include <sys/refcount.h> 60#include <sys/resourcevar.h> 61#include <sys/rwlock.h> 62#include <sys/sbuf.h> 63#include <sys/sysent.h> 64#include <sys/sched.h> 65#include <sys/smp.h> 66#include <sys/stack.h> 67#include <sys/stat.h> 68#include <sys/sysctl.h> 69#include <sys/filedesc.h> 70#include <sys/tty.h> 71#include <sys/signalvar.h> 72#include <sys/sdt.h> 73#include <sys/sx.h> 74#include <sys/user.h> 75#include <sys/vnode.h> 76#include <sys/wait.h> 77 78#ifdef DDB 79#include <ddb/ddb.h> 80#endif 81 82#include <vm/vm.h> 83#include <vm/vm_param.h> 84#include <vm/vm_extern.h> 85#include <vm/pmap.h> 86#include <vm/vm_map.h> 87#include <vm/vm_object.h> 88#include <vm/vm_page.h> 89#include <vm/uma.h> 90 91#ifdef COMPAT_FREEBSD32 92#include <compat/freebsd32/freebsd32.h> 93#include <compat/freebsd32/freebsd32_util.h> 94#endif 95 96SDT_PROVIDER_DEFINE(proc); 97SDT_PROBE_DEFINE4(proc, , ctor, entry, "struct proc *", "int", "void *", 98 "int"); 99SDT_PROBE_DEFINE4(proc, , ctor, return, "struct proc *", "int", "void *", 100 "int"); 101SDT_PROBE_DEFINE4(proc, , dtor, entry, "struct proc *", "int", "void *", 102 "struct thread *"); 103SDT_PROBE_DEFINE3(proc, , dtor, return, "struct proc *", "int", "void *"); 104SDT_PROBE_DEFINE3(proc, , init, entry, "struct proc *", "int", "int"); 105SDT_PROBE_DEFINE3(proc, , init, return, "struct proc *", "int", "int"); 106 107MALLOC_DEFINE(M_PGRP, "pgrp", "process group header"); 108MALLOC_DEFINE(M_SESSION, "session", "session header"); 109static MALLOC_DEFINE(M_PROC, "proc", "Proc structures"); 110MALLOC_DEFINE(M_SUBPROC, "subproc", "Proc sub-structures"); 111 112static void doenterpgrp(struct proc *, struct pgrp *); 113static void orphanpg(struct pgrp *pg); 114static void fill_kinfo_aggregate(struct proc *p, struct kinfo_proc *kp); 115static void fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp); 116static void fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp, 117 int preferthread); 118static void pgadjustjobc(struct pgrp *pgrp, int entering); 119static void pgdelete(struct pgrp *); 120static int proc_ctor(void *mem, int size, void *arg, int flags); 121static void proc_dtor(void *mem, int size, void *arg); 122static int proc_init(void *mem, int size, int flags); 123static void proc_fini(void *mem, int size); 124static void pargs_free(struct pargs *pa); 125static struct proc *zpfind_locked(pid_t pid); 126 127/* 128 * Other process lists 129 */ 130struct pidhashhead *pidhashtbl; 131u_long pidhash; 132struct pgrphashhead *pgrphashtbl; 133u_long pgrphash; 134struct proclist allproc; 135struct proclist zombproc; 136struct sx __exclusive_cache_line allproc_lock; 137struct sx __exclusive_cache_line proctree_lock; 138struct mtx __exclusive_cache_line ppeers_lock; 139uma_zone_t proc_zone; 140 141/* 142 * The offset of various fields in struct proc and struct thread. 143 * These are used by kernel debuggers to enumerate kernel threads and 144 * processes. 145 */ 146const int proc_off_p_pid = offsetof(struct proc, p_pid); 147const int proc_off_p_comm = offsetof(struct proc, p_comm); 148const int proc_off_p_list = offsetof(struct proc, p_list); 149const int proc_off_p_threads = offsetof(struct proc, p_threads); 150const int thread_off_td_tid = offsetof(struct thread, td_tid); 151const int thread_off_td_name = offsetof(struct thread, td_name); 152const int thread_off_td_oncpu = offsetof(struct thread, td_oncpu); 153const int thread_off_td_pcb = offsetof(struct thread, td_pcb); 154const int thread_off_td_plist = offsetof(struct thread, td_plist); 155 156int kstack_pages = KSTACK_PAGES; 157SYSCTL_INT(_kern, OID_AUTO, kstack_pages, CTLFLAG_RD, &kstack_pages, 0, 158 "Kernel stack size in pages"); 159static int vmmap_skip_res_cnt = 0; 160SYSCTL_INT(_kern, OID_AUTO, proc_vmmap_skip_resident_count, CTLFLAG_RW, 161 &vmmap_skip_res_cnt, 0, 162 "Skip calculation of the pages resident count in kern.proc.vmmap"); 163 164CTASSERT(sizeof(struct kinfo_proc) == KINFO_PROC_SIZE); 165#ifdef COMPAT_FREEBSD32 166CTASSERT(sizeof(struct kinfo_proc32) == KINFO_PROC32_SIZE); 167#endif 168 169/* 170 * Initialize global process hashing structures. 171 */ 172void 173procinit(void) 174{ 175 176 sx_init(&allproc_lock, "allproc"); 177 sx_init(&proctree_lock, "proctree"); 178 mtx_init(&ppeers_lock, "p_peers", NULL, MTX_DEF); 179 LIST_INIT(&allproc); 180 LIST_INIT(&zombproc); 181 pidhashtbl = hashinit(maxproc / 4, M_PROC, &pidhash); 182 pgrphashtbl = hashinit(maxproc / 4, M_PROC, &pgrphash); 183 proc_zone = uma_zcreate("PROC", sched_sizeof_proc(), 184 proc_ctor, proc_dtor, proc_init, proc_fini, 185 UMA_ALIGN_PTR, UMA_ZONE_NOFREE); 186 uihashinit(); 187} 188 189/* 190 * Prepare a proc for use. 191 */ 192static int 193proc_ctor(void *mem, int size, void *arg, int flags) 194{ 195 struct proc *p; 196 struct thread *td; 197 198 p = (struct proc *)mem; 199 SDT_PROBE4(proc, , ctor , entry, p, size, arg, flags); 200 EVENTHANDLER_INVOKE(process_ctor, p); 201 SDT_PROBE4(proc, , ctor , return, p, size, arg, flags); 202 td = FIRST_THREAD_IN_PROC(p); 203 if (td != NULL) { 204 /* Make sure all thread constructors are executed */ 205 EVENTHANDLER_INVOKE(thread_ctor, td); 206 } 207 return (0); 208} 209 210/* 211 * Reclaim a proc after use. 212 */ 213static void 214proc_dtor(void *mem, int size, void *arg) 215{ 216 struct proc *p; 217 struct thread *td; 218 219 /* INVARIANTS checks go here */ 220 p = (struct proc *)mem; 221 td = FIRST_THREAD_IN_PROC(p); 222 SDT_PROBE4(proc, , dtor, entry, p, size, arg, td); 223 if (td != NULL) { 224#ifdef INVARIANTS 225 KASSERT((p->p_numthreads == 1), 226 ("bad number of threads in exiting process")); 227 KASSERT(STAILQ_EMPTY(&p->p_ktr), ("proc_dtor: non-empty p_ktr")); 228#endif 229 /* Free all OSD associated to this thread. */ 230 osd_thread_exit(td); 231 td_softdep_cleanup(td); 232 MPASS(td->td_su == NULL); 233 234 /* Make sure all thread destructors are executed */ 235 EVENTHANDLER_INVOKE(thread_dtor, td); 236 } 237 EVENTHANDLER_INVOKE(process_dtor, p); 238 if (p->p_ksi != NULL) 239 KASSERT(! KSI_ONQ(p->p_ksi), ("SIGCHLD queue")); 240 SDT_PROBE3(proc, , dtor, return, p, size, arg); 241} 242 243/* 244 * Initialize type-stable parts of a proc (when newly created). 245 */ 246static int 247proc_init(void *mem, int size, int flags) 248{ 249 struct proc *p; 250 251 p = (struct proc *)mem; 252 SDT_PROBE3(proc, , init, entry, p, size, flags); 253 mtx_init(&p->p_mtx, "process lock", NULL, MTX_DEF | MTX_DUPOK | MTX_NEW); 254 mtx_init(&p->p_slock, "process slock", NULL, MTX_SPIN | MTX_NEW); 255 mtx_init(&p->p_statmtx, "pstatl", NULL, MTX_SPIN | MTX_NEW); 256 mtx_init(&p->p_itimmtx, "pitiml", NULL, MTX_SPIN | MTX_NEW); 257 mtx_init(&p->p_profmtx, "pprofl", NULL, MTX_SPIN | MTX_NEW); 258 cv_init(&p->p_pwait, "ppwait"); 259 cv_init(&p->p_dbgwait, "dbgwait"); 260 TAILQ_INIT(&p->p_threads); /* all threads in proc */ 261 EVENTHANDLER_INVOKE(process_init, p); 262 p->p_stats = pstats_alloc(); 263 p->p_pgrp = NULL; 264 SDT_PROBE3(proc, , init, return, p, size, flags); 265 return (0); 266} 267 268/* 269 * UMA should ensure that this function is never called. 270 * Freeing a proc structure would violate type stability. 271 */ 272static void 273proc_fini(void *mem, int size) 274{ 275#ifdef notnow 276 struct proc *p; 277 278 p = (struct proc *)mem; 279 EVENTHANDLER_INVOKE(process_fini, p); 280 pstats_free(p->p_stats); 281 thread_free(FIRST_THREAD_IN_PROC(p)); 282 mtx_destroy(&p->p_mtx); 283 if (p->p_ksi != NULL) 284 ksiginfo_free(p->p_ksi); 285#else 286 panic("proc reclaimed"); 287#endif 288} 289 290/* 291 * Is p an inferior of the current process? 292 */ 293int 294inferior(struct proc *p) 295{ 296 297 sx_assert(&proctree_lock, SX_LOCKED); 298 PROC_LOCK_ASSERT(p, MA_OWNED); 299 for (; p != curproc; p = proc_realparent(p)) { 300 if (p->p_pid == 0) 301 return (0); 302 } 303 return (1); 304} 305 306struct proc * 307pfind_locked(pid_t pid) 308{ 309 struct proc *p; 310 311 sx_assert(&allproc_lock, SX_LOCKED); 312 LIST_FOREACH(p, PIDHASH(pid), p_hash) { 313 if (p->p_pid == pid) { 314 PROC_LOCK(p); 315 if (p->p_state == PRS_NEW) { 316 PROC_UNLOCK(p); 317 p = NULL; 318 } 319 break; 320 } 321 } 322 return (p); 323} 324 325/* 326 * Locate a process by number; return only "live" processes -- i.e., neither 327 * zombies nor newly born but incompletely initialized processes. By not 328 * returning processes in the PRS_NEW state, we allow callers to avoid 329 * testing for that condition to avoid dereferencing p_ucred, et al. 330 */ 331struct proc * 332pfind(pid_t pid) 333{ 334 struct proc *p; 335 336 sx_slock(&allproc_lock); 337 p = pfind_locked(pid); 338 sx_sunlock(&allproc_lock); 339 return (p); 340} 341 342static struct proc * 343pfind_tid_locked(pid_t tid) 344{ 345 struct proc *p; 346 struct thread *td; 347 348 sx_assert(&allproc_lock, SX_LOCKED); 349 FOREACH_PROC_IN_SYSTEM(p) { 350 PROC_LOCK(p); 351 if (p->p_state == PRS_NEW) { 352 PROC_UNLOCK(p); 353 continue; 354 } 355 FOREACH_THREAD_IN_PROC(p, td) { 356 if (td->td_tid == tid) 357 goto found; 358 } 359 PROC_UNLOCK(p); 360 } 361found: 362 return (p); 363} 364 365/* 366 * Locate a process group by number. 367 * The caller must hold proctree_lock. 368 */ 369struct pgrp * 370pgfind(pgid) 371 register pid_t pgid; 372{ 373 register struct pgrp *pgrp; 374 375 sx_assert(&proctree_lock, SX_LOCKED); 376 377 LIST_FOREACH(pgrp, PGRPHASH(pgid), pg_hash) { 378 if (pgrp->pg_id == pgid) { 379 PGRP_LOCK(pgrp); 380 return (pgrp); 381 } 382 } 383 return (NULL); 384} 385 386/* 387 * Locate process and do additional manipulations, depending on flags. 388 */ 389int 390pget(pid_t pid, int flags, struct proc **pp) 391{ 392 struct proc *p; 393 int error; 394 395 sx_slock(&allproc_lock); 396 if (pid <= PID_MAX) { 397 p = pfind_locked(pid); 398 if (p == NULL && (flags & PGET_NOTWEXIT) == 0) 399 p = zpfind_locked(pid); 400 } else if ((flags & PGET_NOTID) == 0) { 401 p = pfind_tid_locked(pid); 402 } else { 403 p = NULL; 404 } 405 sx_sunlock(&allproc_lock); 406 if (p == NULL) 407 return (ESRCH); 408 if ((flags & PGET_CANSEE) != 0) { 409 error = p_cansee(curthread, p); 410 if (error != 0) 411 goto errout; 412 } 413 if ((flags & PGET_CANDEBUG) != 0) { 414 error = p_candebug(curthread, p); 415 if (error != 0) 416 goto errout; 417 } 418 if ((flags & PGET_ISCURRENT) != 0 && curproc != p) { 419 error = EPERM; 420 goto errout; 421 } 422 if ((flags & PGET_NOTWEXIT) != 0 && (p->p_flag & P_WEXIT) != 0) { 423 error = ESRCH; 424 goto errout; 425 } 426 if ((flags & PGET_NOTINEXEC) != 0 && (p->p_flag & P_INEXEC) != 0) { 427 /* 428 * XXXRW: Not clear ESRCH is the right error during proc 429 * execve(). 430 */ 431 error = ESRCH; 432 goto errout; 433 } 434 if ((flags & PGET_HOLD) != 0) { 435 _PHOLD(p); 436 PROC_UNLOCK(p); 437 } 438 *pp = p; 439 return (0); 440errout: 441 PROC_UNLOCK(p); 442 return (error); 443} 444 445/* 446 * Create a new process group. 447 * pgid must be equal to the pid of p. 448 * Begin a new session if required. 449 */ 450int 451enterpgrp(p, pgid, pgrp, sess) 452 register struct proc *p; 453 pid_t pgid; 454 struct pgrp *pgrp; 455 struct session *sess; 456{ 457 458 sx_assert(&proctree_lock, SX_XLOCKED); 459 460 KASSERT(pgrp != NULL, ("enterpgrp: pgrp == NULL")); 461 KASSERT(p->p_pid == pgid, 462 ("enterpgrp: new pgrp and pid != pgid")); 463 KASSERT(pgfind(pgid) == NULL, 464 ("enterpgrp: pgrp with pgid exists")); 465 KASSERT(!SESS_LEADER(p), 466 ("enterpgrp: session leader attempted setpgrp")); 467 468 mtx_init(&pgrp->pg_mtx, "process group", NULL, MTX_DEF | MTX_DUPOK); 469 470 if (sess != NULL) { 471 /* 472 * new session 473 */ 474 mtx_init(&sess->s_mtx, "session", NULL, MTX_DEF); 475 PROC_LOCK(p); 476 p->p_flag &= ~P_CONTROLT; 477 PROC_UNLOCK(p); 478 PGRP_LOCK(pgrp); 479 sess->s_leader = p; 480 sess->s_sid = p->p_pid; 481 refcount_init(&sess->s_count, 1); 482 sess->s_ttyvp = NULL; 483 sess->s_ttydp = NULL; 484 sess->s_ttyp = NULL; 485 bcopy(p->p_session->s_login, sess->s_login, 486 sizeof(sess->s_login)); 487 pgrp->pg_session = sess; 488 KASSERT(p == curproc, 489 ("enterpgrp: mksession and p != curproc")); 490 } else { 491 pgrp->pg_session = p->p_session; 492 sess_hold(pgrp->pg_session); 493 PGRP_LOCK(pgrp); 494 } 495 pgrp->pg_id = pgid; 496 LIST_INIT(&pgrp->pg_members); 497 498 /* 499 * As we have an exclusive lock of proctree_lock, 500 * this should not deadlock. 501 */ 502 LIST_INSERT_HEAD(PGRPHASH(pgid), pgrp, pg_hash); 503 pgrp->pg_jobc = 0; 504 SLIST_INIT(&pgrp->pg_sigiolst); 505 PGRP_UNLOCK(pgrp); 506 507 doenterpgrp(p, pgrp); 508 509 return (0); 510} 511 512/* 513 * Move p to an existing process group 514 */ 515int 516enterthispgrp(p, pgrp) 517 register struct proc *p; 518 struct pgrp *pgrp; 519{ 520 521 sx_assert(&proctree_lock, SX_XLOCKED); 522 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 523 PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED); 524 PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED); 525 SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED); 526 KASSERT(pgrp->pg_session == p->p_session, 527 ("%s: pgrp's session %p, p->p_session %p.\n", 528 __func__, 529 pgrp->pg_session, 530 p->p_session)); 531 KASSERT(pgrp != p->p_pgrp, 532 ("%s: p belongs to pgrp.", __func__)); 533 534 doenterpgrp(p, pgrp); 535 536 return (0); 537} 538 539/* 540 * Move p to a process group 541 */ 542static void 543doenterpgrp(p, pgrp) 544 struct proc *p; 545 struct pgrp *pgrp; 546{ 547 struct pgrp *savepgrp; 548 549 sx_assert(&proctree_lock, SX_XLOCKED); 550 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 551 PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED); 552 PGRP_LOCK_ASSERT(p->p_pgrp, MA_NOTOWNED); 553 SESS_LOCK_ASSERT(p->p_session, MA_NOTOWNED); 554 555 savepgrp = p->p_pgrp; 556 557 /* 558 * Adjust eligibility of affected pgrps to participate in job control. 559 * Increment eligibility counts before decrementing, otherwise we 560 * could reach 0 spuriously during the first call. 561 */ 562 fixjobc(p, pgrp, 1); 563 fixjobc(p, p->p_pgrp, 0); 564 565 PGRP_LOCK(pgrp); 566 PGRP_LOCK(savepgrp); 567 PROC_LOCK(p); 568 LIST_REMOVE(p, p_pglist); 569 p->p_pgrp = pgrp; 570 PROC_UNLOCK(p); 571 LIST_INSERT_HEAD(&pgrp->pg_members, p, p_pglist); 572 PGRP_UNLOCK(savepgrp); 573 PGRP_UNLOCK(pgrp); 574 if (LIST_EMPTY(&savepgrp->pg_members)) 575 pgdelete(savepgrp); 576} 577 578/* 579 * remove process from process group 580 */ 581int 582leavepgrp(p) 583 register struct proc *p; 584{ 585 struct pgrp *savepgrp; 586 587 sx_assert(&proctree_lock, SX_XLOCKED); 588 savepgrp = p->p_pgrp; 589 PGRP_LOCK(savepgrp); 590 PROC_LOCK(p); 591 LIST_REMOVE(p, p_pglist); 592 p->p_pgrp = NULL; 593 PROC_UNLOCK(p); 594 PGRP_UNLOCK(savepgrp); 595 if (LIST_EMPTY(&savepgrp->pg_members)) 596 pgdelete(savepgrp); 597 return (0); 598} 599 600/* 601 * delete a process group 602 */ 603static void 604pgdelete(pgrp) 605 register struct pgrp *pgrp; 606{ 607 struct session *savesess; 608 struct tty *tp; 609 610 sx_assert(&proctree_lock, SX_XLOCKED); 611 PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED); 612 SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED); 613 614 /* 615 * Reset any sigio structures pointing to us as a result of 616 * F_SETOWN with our pgid. 617 */ 618 funsetownlst(&pgrp->pg_sigiolst); 619 620 PGRP_LOCK(pgrp); 621 tp = pgrp->pg_session->s_ttyp; 622 LIST_REMOVE(pgrp, pg_hash); 623 savesess = pgrp->pg_session; 624 PGRP_UNLOCK(pgrp); 625 626 /* Remove the reference to the pgrp before deallocating it. */ 627 if (tp != NULL) { 628 tty_lock(tp); 629 tty_rel_pgrp(tp, pgrp); 630 } 631 632 mtx_destroy(&pgrp->pg_mtx); 633 free(pgrp, M_PGRP); 634 sess_release(savesess); 635} 636 637static void 638pgadjustjobc(pgrp, entering) 639 struct pgrp *pgrp; 640 int entering; 641{ 642 643 PGRP_LOCK(pgrp); 644 if (entering) 645 pgrp->pg_jobc++; 646 else { 647 --pgrp->pg_jobc; 648 if (pgrp->pg_jobc == 0) 649 orphanpg(pgrp); 650 } 651 PGRP_UNLOCK(pgrp); 652} 653 654/* 655 * Adjust pgrp jobc counters when specified process changes process group. 656 * We count the number of processes in each process group that "qualify" 657 * the group for terminal job control (those with a parent in a different 658 * process group of the same session). If that count reaches zero, the 659 * process group becomes orphaned. Check both the specified process' 660 * process group and that of its children. 661 * entering == 0 => p is leaving specified group. 662 * entering == 1 => p is entering specified group. 663 */ 664void 665fixjobc(struct proc *p, struct pgrp *pgrp, int entering) 666{ 667 struct pgrp *hispgrp; 668 struct session *mysession; 669 struct proc *q; 670 671 sx_assert(&proctree_lock, SX_LOCKED); 672 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 673 PGRP_LOCK_ASSERT(pgrp, MA_NOTOWNED); 674 SESS_LOCK_ASSERT(pgrp->pg_session, MA_NOTOWNED); 675 676 /* 677 * Check p's parent to see whether p qualifies its own process 678 * group; if so, adjust count for p's process group. 679 */ 680 mysession = pgrp->pg_session; 681 if ((hispgrp = p->p_pptr->p_pgrp) != pgrp && 682 hispgrp->pg_session == mysession) 683 pgadjustjobc(pgrp, entering); 684 685 /* 686 * Check this process' children to see whether they qualify 687 * their process groups; if so, adjust counts for children's 688 * process groups. 689 */ 690 LIST_FOREACH(q, &p->p_children, p_sibling) { 691 hispgrp = q->p_pgrp; 692 if (hispgrp == pgrp || 693 hispgrp->pg_session != mysession) 694 continue; 695 if (q->p_state == PRS_ZOMBIE) 696 continue; 697 pgadjustjobc(hispgrp, entering); 698 } 699} 700 701void 702killjobc(void) 703{ 704 struct session *sp; 705 struct tty *tp; 706 struct proc *p; 707 struct vnode *ttyvp; 708 709 p = curproc; 710 MPASS(p->p_flag & P_WEXIT); 711 /* 712 * Do a quick check to see if there is anything to do with the 713 * proctree_lock held. pgrp and LIST_EMPTY checks are for fixjobc(). 714 */ 715 PROC_LOCK(p); 716 if (!SESS_LEADER(p) && 717 (p->p_pgrp == p->p_pptr->p_pgrp) && 718 LIST_EMPTY(&p->p_children)) { 719 PROC_UNLOCK(p); 720 return; 721 } 722 PROC_UNLOCK(p); 723 724 sx_xlock(&proctree_lock); 725 if (SESS_LEADER(p)) { 726 sp = p->p_session; 727 728 /* 729 * s_ttyp is not zero'd; we use this to indicate that 730 * the session once had a controlling terminal. (for 731 * logging and informational purposes) 732 */ 733 SESS_LOCK(sp); 734 ttyvp = sp->s_ttyvp; 735 tp = sp->s_ttyp; 736 sp->s_ttyvp = NULL; 737 sp->s_ttydp = NULL; 738 sp->s_leader = NULL; 739 SESS_UNLOCK(sp); 740 741 /* 742 * Signal foreground pgrp and revoke access to 743 * controlling terminal if it has not been revoked 744 * already. 745 * 746 * Because the TTY may have been revoked in the mean 747 * time and could already have a new session associated 748 * with it, make sure we don't send a SIGHUP to a 749 * foreground process group that does not belong to this 750 * session. 751 */ 752 753 if (tp != NULL) { 754 tty_lock(tp); 755 if (tp->t_session == sp) 756 tty_signal_pgrp(tp, SIGHUP); 757 tty_unlock(tp); 758 } 759 760 if (ttyvp != NULL) { 761 sx_xunlock(&proctree_lock); 762 if (vn_lock(ttyvp, LK_EXCLUSIVE) == 0) { 763 VOP_REVOKE(ttyvp, REVOKEALL); 764 VOP_UNLOCK(ttyvp, 0); 765 } 766 vrele(ttyvp); 767 sx_xlock(&proctree_lock); 768 } 769 } 770 fixjobc(p, p->p_pgrp, 0); 771 sx_xunlock(&proctree_lock); 772} 773 774/* 775 * A process group has become orphaned; 776 * if there are any stopped processes in the group, 777 * hang-up all process in that group. 778 */ 779static void 780orphanpg(pg) 781 struct pgrp *pg; 782{ 783 register struct proc *p; 784 785 PGRP_LOCK_ASSERT(pg, MA_OWNED); 786 787 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 788 PROC_LOCK(p); 789 if (P_SHOULDSTOP(p) == P_STOPPED_SIG) { 790 PROC_UNLOCK(p); 791 LIST_FOREACH(p, &pg->pg_members, p_pglist) { 792 PROC_LOCK(p); 793 kern_psignal(p, SIGHUP); 794 kern_psignal(p, SIGCONT); 795 PROC_UNLOCK(p); 796 } 797 return; 798 } 799 PROC_UNLOCK(p); 800 } 801} 802 803void 804sess_hold(struct session *s) 805{ 806 807 refcount_acquire(&s->s_count); 808} 809 810void 811sess_release(struct session *s) 812{ 813 814 if (refcount_release(&s->s_count)) { 815 if (s->s_ttyp != NULL) { 816 tty_lock(s->s_ttyp); 817 tty_rel_sess(s->s_ttyp, s); 818 } 819 mtx_destroy(&s->s_mtx); 820 free(s, M_SESSION); 821 } 822} 823 824#ifdef DDB 825 826DB_SHOW_COMMAND(pgrpdump, pgrpdump) 827{ 828 register struct pgrp *pgrp; 829 register struct proc *p; 830 register int i; 831 832 for (i = 0; i <= pgrphash; i++) { 833 if (!LIST_EMPTY(&pgrphashtbl[i])) { 834 printf("\tindx %d\n", i); 835 LIST_FOREACH(pgrp, &pgrphashtbl[i], pg_hash) { 836 printf( 837 "\tpgrp %p, pgid %ld, sess %p, sesscnt %d, mem %p\n", 838 (void *)pgrp, (long)pgrp->pg_id, 839 (void *)pgrp->pg_session, 840 pgrp->pg_session->s_count, 841 (void *)LIST_FIRST(&pgrp->pg_members)); 842 LIST_FOREACH(p, &pgrp->pg_members, p_pglist) { 843 printf("\t\tpid %ld addr %p pgrp %p\n", 844 (long)p->p_pid, (void *)p, 845 (void *)p->p_pgrp); 846 } 847 } 848 } 849 } 850} 851#endif /* DDB */ 852 853/* 854 * Calculate the kinfo_proc members which contain process-wide 855 * informations. 856 * Must be called with the target process locked. 857 */ 858static void 859fill_kinfo_aggregate(struct proc *p, struct kinfo_proc *kp) 860{ 861 struct thread *td; 862 863 PROC_LOCK_ASSERT(p, MA_OWNED); 864 865 kp->ki_estcpu = 0; 866 kp->ki_pctcpu = 0; 867 FOREACH_THREAD_IN_PROC(p, td) { 868 thread_lock(td); 869 kp->ki_pctcpu += sched_pctcpu(td); 870 kp->ki_estcpu += sched_estcpu(td); 871 thread_unlock(td); 872 } 873} 874 875/* 876 * Clear kinfo_proc and fill in any information that is common 877 * to all threads in the process. 878 * Must be called with the target process locked. 879 */ 880static void 881fill_kinfo_proc_only(struct proc *p, struct kinfo_proc *kp) 882{ 883 struct thread *td0; 884 struct tty *tp; 885 struct session *sp; 886 struct ucred *cred; 887 struct sigacts *ps; 888 struct timeval boottime; 889 890 /* For proc_realparent. */ 891 sx_assert(&proctree_lock, SX_LOCKED); 892 PROC_LOCK_ASSERT(p, MA_OWNED); 893 bzero(kp, sizeof(*kp)); 894 895 kp->ki_structsize = sizeof(*kp); 896 kp->ki_paddr = p; 897 kp->ki_addr =/* p->p_addr; */0; /* XXX */ 898 kp->ki_args = p->p_args; 899 kp->ki_textvp = p->p_textvp; 900#ifdef KTRACE 901 kp->ki_tracep = p->p_tracevp; 902 kp->ki_traceflag = p->p_traceflag; 903#endif 904 kp->ki_fd = p->p_fd; 905 kp->ki_vmspace = p->p_vmspace; 906 kp->ki_flag = p->p_flag; 907 kp->ki_flag2 = p->p_flag2; 908 cred = p->p_ucred; 909 if (cred) { 910 kp->ki_uid = cred->cr_uid; 911 kp->ki_ruid = cred->cr_ruid; 912 kp->ki_svuid = cred->cr_svuid; 913 kp->ki_cr_flags = 0; 914 if (cred->cr_flags & CRED_FLAG_CAPMODE) 915 kp->ki_cr_flags |= KI_CRF_CAPABILITY_MODE; 916 /* XXX bde doesn't like KI_NGROUPS */ 917 if (cred->cr_ngroups > KI_NGROUPS) { 918 kp->ki_ngroups = KI_NGROUPS; 919 kp->ki_cr_flags |= KI_CRF_GRP_OVERFLOW; 920 } else 921 kp->ki_ngroups = cred->cr_ngroups; 922 bcopy(cred->cr_groups, kp->ki_groups, 923 kp->ki_ngroups * sizeof(gid_t)); 924 kp->ki_rgid = cred->cr_rgid; 925 kp->ki_svgid = cred->cr_svgid; 926 /* If jailed(cred), emulate the old P_JAILED flag. */ 927 if (jailed(cred)) { 928 kp->ki_flag |= P_JAILED; 929 /* If inside the jail, use 0 as a jail ID. */ 930 if (cred->cr_prison != curthread->td_ucred->cr_prison) 931 kp->ki_jid = cred->cr_prison->pr_id; 932 } 933 strlcpy(kp->ki_loginclass, cred->cr_loginclass->lc_name, 934 sizeof(kp->ki_loginclass)); 935 } 936 ps = p->p_sigacts; 937 if (ps) { 938 mtx_lock(&ps->ps_mtx); 939 kp->ki_sigignore = ps->ps_sigignore; 940 kp->ki_sigcatch = ps->ps_sigcatch; 941 mtx_unlock(&ps->ps_mtx); 942 } 943 if (p->p_state != PRS_NEW && 944 p->p_state != PRS_ZOMBIE && 945 p->p_vmspace != NULL) { 946 struct vmspace *vm = p->p_vmspace; 947 948 kp->ki_size = vm->vm_map.size; 949 kp->ki_rssize = vmspace_resident_count(vm); /*XXX*/ 950 FOREACH_THREAD_IN_PROC(p, td0) { 951 if (!TD_IS_SWAPPED(td0)) 952 kp->ki_rssize += td0->td_kstack_pages; 953 } 954 kp->ki_swrss = vm->vm_swrss; 955 kp->ki_tsize = vm->vm_tsize; 956 kp->ki_dsize = vm->vm_dsize; 957 kp->ki_ssize = vm->vm_ssize; 958 } else if (p->p_state == PRS_ZOMBIE) 959 kp->ki_stat = SZOMB; 960 if (kp->ki_flag & P_INMEM) 961 kp->ki_sflag = PS_INMEM; 962 else 963 kp->ki_sflag = 0; 964 /* Calculate legacy swtime as seconds since 'swtick'. */ 965 kp->ki_swtime = (ticks - p->p_swtick) / hz; 966 kp->ki_pid = p->p_pid; 967 kp->ki_nice = p->p_nice; 968 kp->ki_fibnum = p->p_fibnum; 969 kp->ki_start = p->p_stats->p_start; 970 getboottime(&boottime); 971 timevaladd(&kp->ki_start, &boottime); 972 PROC_STATLOCK(p); 973 rufetch(p, &kp->ki_rusage); 974 kp->ki_runtime = cputick2usec(p->p_rux.rux_runtime); 975 calcru(p, &kp->ki_rusage.ru_utime, &kp->ki_rusage.ru_stime); 976 PROC_STATUNLOCK(p); 977 calccru(p, &kp->ki_childutime, &kp->ki_childstime); 978 /* Some callers want child times in a single value. */ 979 kp->ki_childtime = kp->ki_childstime; 980 timevaladd(&kp->ki_childtime, &kp->ki_childutime); 981 982 FOREACH_THREAD_IN_PROC(p, td0) 983 kp->ki_cow += td0->td_cow; 984 985 tp = NULL; 986 if (p->p_pgrp) { 987 kp->ki_pgid = p->p_pgrp->pg_id; 988 kp->ki_jobc = p->p_pgrp->pg_jobc; 989 sp = p->p_pgrp->pg_session; 990 991 if (sp != NULL) { 992 kp->ki_sid = sp->s_sid; 993 SESS_LOCK(sp); 994 strlcpy(kp->ki_login, sp->s_login, 995 sizeof(kp->ki_login)); 996 if (sp->s_ttyvp) 997 kp->ki_kiflag |= KI_CTTY; 998 if (SESS_LEADER(p)) 999 kp->ki_kiflag |= KI_SLEADER; 1000 /* XXX proctree_lock */ 1001 tp = sp->s_ttyp; 1002 SESS_UNLOCK(sp); 1003 } 1004 } 1005 if ((p->p_flag & P_CONTROLT) && tp != NULL) { 1006 kp->ki_tdev = tty_udev(tp); 1007 kp->ki_tpgid = tp->t_pgrp ? tp->t_pgrp->pg_id : NO_PID; 1008 if (tp->t_session) 1009 kp->ki_tsid = tp->t_session->s_sid; 1010 } else 1011 kp->ki_tdev = NODEV; 1012 if (p->p_comm[0] != '\0') 1013 strlcpy(kp->ki_comm, p->p_comm, sizeof(kp->ki_comm)); 1014 if (p->p_sysent && p->p_sysent->sv_name != NULL && 1015 p->p_sysent->sv_name[0] != '\0') 1016 strlcpy(kp->ki_emul, p->p_sysent->sv_name, sizeof(kp->ki_emul)); 1017 kp->ki_siglist = p->p_siglist; 1018 kp->ki_xstat = KW_EXITCODE(p->p_xexit, p->p_xsig); 1019 kp->ki_acflag = p->p_acflag; 1020 kp->ki_lock = p->p_lock; 1021 if (p->p_pptr) { 1022 kp->ki_ppid = proc_realparent(p)->p_pid; 1023 if (p->p_flag & P_TRACED) 1024 kp->ki_tracer = p->p_pptr->p_pid; 1025 } 1026} 1027 1028/* 1029 * Fill in information that is thread specific. Must be called with 1030 * target process locked. If 'preferthread' is set, overwrite certain 1031 * process-related fields that are maintained for both threads and 1032 * processes. 1033 */ 1034static void 1035fill_kinfo_thread(struct thread *td, struct kinfo_proc *kp, int preferthread) 1036{ 1037 struct proc *p; 1038 1039 p = td->td_proc; 1040 kp->ki_tdaddr = td; 1041 PROC_LOCK_ASSERT(p, MA_OWNED); 1042 1043 if (preferthread) 1044 PROC_STATLOCK(p); 1045 thread_lock(td); 1046 if (td->td_wmesg != NULL) 1047 strlcpy(kp->ki_wmesg, td->td_wmesg, sizeof(kp->ki_wmesg)); 1048 else 1049 bzero(kp->ki_wmesg, sizeof(kp->ki_wmesg)); 1050 if (strlcpy(kp->ki_tdname, td->td_name, sizeof(kp->ki_tdname)) >= 1051 sizeof(kp->ki_tdname)) { 1052 strlcpy(kp->ki_moretdname, 1053 td->td_name + sizeof(kp->ki_tdname) - 1, 1054 sizeof(kp->ki_moretdname)); 1055 } else { 1056 bzero(kp->ki_moretdname, sizeof(kp->ki_moretdname)); 1057 } 1058 if (TD_ON_LOCK(td)) { 1059 kp->ki_kiflag |= KI_LOCKBLOCK; 1060 strlcpy(kp->ki_lockname, td->td_lockname, 1061 sizeof(kp->ki_lockname)); 1062 } else { 1063 kp->ki_kiflag &= ~KI_LOCKBLOCK; 1064 bzero(kp->ki_lockname, sizeof(kp->ki_lockname)); 1065 } 1066 1067 if (p->p_state == PRS_NORMAL) { /* approximate. */ 1068 if (TD_ON_RUNQ(td) || 1069 TD_CAN_RUN(td) || 1070 TD_IS_RUNNING(td)) { 1071 kp->ki_stat = SRUN; 1072 } else if (P_SHOULDSTOP(p)) { 1073 kp->ki_stat = SSTOP; 1074 } else if (TD_IS_SLEEPING(td)) { 1075 kp->ki_stat = SSLEEP; 1076 } else if (TD_ON_LOCK(td)) { 1077 kp->ki_stat = SLOCK; 1078 } else { 1079 kp->ki_stat = SWAIT; 1080 } 1081 } else if (p->p_state == PRS_ZOMBIE) { 1082 kp->ki_stat = SZOMB; 1083 } else { 1084 kp->ki_stat = SIDL; 1085 } 1086 1087 /* Things in the thread */ 1088 kp->ki_wchan = td->td_wchan; 1089 kp->ki_pri.pri_level = td->td_priority; 1090 kp->ki_pri.pri_native = td->td_base_pri; 1091 1092 /* 1093 * Note: legacy fields; clamp at the old NOCPU value and/or 1094 * the maximum u_char CPU value. 1095 */ 1096 if (td->td_lastcpu == NOCPU) 1097 kp->ki_lastcpu_old = NOCPU_OLD; 1098 else if (td->td_lastcpu > MAXCPU_OLD) 1099 kp->ki_lastcpu_old = MAXCPU_OLD; 1100 else 1101 kp->ki_lastcpu_old = td->td_lastcpu; 1102 1103 if (td->td_oncpu == NOCPU) 1104 kp->ki_oncpu_old = NOCPU_OLD; 1105 else if (td->td_oncpu > MAXCPU_OLD) 1106 kp->ki_oncpu_old = MAXCPU_OLD; 1107 else 1108 kp->ki_oncpu_old = td->td_oncpu; 1109 1110 kp->ki_lastcpu = td->td_lastcpu; 1111 kp->ki_oncpu = td->td_oncpu; 1112 kp->ki_tdflags = td->td_flags; 1113 kp->ki_tid = td->td_tid; 1114 kp->ki_numthreads = p->p_numthreads; 1115 kp->ki_pcb = td->td_pcb; 1116 kp->ki_kstack = (void *)td->td_kstack; 1117 kp->ki_slptime = (ticks - td->td_slptick) / hz; 1118 kp->ki_pri.pri_class = td->td_pri_class; 1119 kp->ki_pri.pri_user = td->td_user_pri; 1120 1121 if (preferthread) { 1122 rufetchtd(td, &kp->ki_rusage); 1123 kp->ki_runtime = cputick2usec(td->td_rux.rux_runtime); 1124 kp->ki_pctcpu = sched_pctcpu(td); 1125 kp->ki_estcpu = sched_estcpu(td); 1126 kp->ki_cow = td->td_cow; 1127 } 1128 1129 /* We can't get this anymore but ps etc never used it anyway. */ 1130 kp->ki_rqindex = 0; 1131 1132 if (preferthread) 1133 kp->ki_siglist = td->td_siglist; 1134 kp->ki_sigmask = td->td_sigmask; 1135 thread_unlock(td); 1136 if (preferthread) 1137 PROC_STATUNLOCK(p); 1138} 1139 1140/* 1141 * Fill in a kinfo_proc structure for the specified process. 1142 * Must be called with the target process locked. 1143 */ 1144void 1145fill_kinfo_proc(struct proc *p, struct kinfo_proc *kp) 1146{ 1147 1148 MPASS(FIRST_THREAD_IN_PROC(p) != NULL); 1149 1150 fill_kinfo_proc_only(p, kp); 1151 fill_kinfo_thread(FIRST_THREAD_IN_PROC(p), kp, 0); 1152 fill_kinfo_aggregate(p, kp); 1153} 1154 1155struct pstats * 1156pstats_alloc(void) 1157{ 1158 1159 return (malloc(sizeof(struct pstats), M_SUBPROC, M_ZERO|M_WAITOK)); 1160} 1161 1162/* 1163 * Copy parts of p_stats; zero the rest of p_stats (statistics). 1164 */ 1165void 1166pstats_fork(struct pstats *src, struct pstats *dst) 1167{ 1168 1169 bzero(&dst->pstat_startzero, 1170 __rangeof(struct pstats, pstat_startzero, pstat_endzero)); 1171 bcopy(&src->pstat_startcopy, &dst->pstat_startcopy, 1172 __rangeof(struct pstats, pstat_startcopy, pstat_endcopy)); 1173} 1174 1175void 1176pstats_free(struct pstats *ps) 1177{ 1178 1179 free(ps, M_SUBPROC); 1180} 1181 1182static struct proc * 1183zpfind_locked(pid_t pid) 1184{ 1185 struct proc *p; 1186 1187 sx_assert(&allproc_lock, SX_LOCKED); 1188 LIST_FOREACH(p, &zombproc, p_list) { 1189 if (p->p_pid == pid) { 1190 PROC_LOCK(p); 1191 break; 1192 } 1193 } 1194 return (p); 1195} 1196 1197/* 1198 * Locate a zombie process by number 1199 */ 1200struct proc * 1201zpfind(pid_t pid) 1202{ 1203 struct proc *p; 1204 1205 sx_slock(&allproc_lock); 1206 p = zpfind_locked(pid); 1207 sx_sunlock(&allproc_lock); 1208 return (p); 1209} 1210 1211#ifdef COMPAT_FREEBSD32 1212 1213/* 1214 * This function is typically used to copy out the kernel address, so 1215 * it can be replaced by assignment of zero. 1216 */ 1217static inline uint32_t 1218ptr32_trim(void *ptr) 1219{ 1220 uintptr_t uptr; 1221 1222 uptr = (uintptr_t)ptr; 1223 return ((uptr > UINT_MAX) ? 0 : uptr); 1224} 1225 1226#define PTRTRIM_CP(src,dst,fld) \ 1227 do { (dst).fld = ptr32_trim((src).fld); } while (0) 1228 1229static void 1230freebsd32_kinfo_proc_out(const struct kinfo_proc *ki, struct kinfo_proc32 *ki32) 1231{ 1232 int i; 1233 1234 bzero(ki32, sizeof(struct kinfo_proc32)); 1235 ki32->ki_structsize = sizeof(struct kinfo_proc32); 1236 CP(*ki, *ki32, ki_layout); 1237 PTRTRIM_CP(*ki, *ki32, ki_args); 1238 PTRTRIM_CP(*ki, *ki32, ki_paddr); 1239 PTRTRIM_CP(*ki, *ki32, ki_addr); 1240 PTRTRIM_CP(*ki, *ki32, ki_tracep); 1241 PTRTRIM_CP(*ki, *ki32, ki_textvp); 1242 PTRTRIM_CP(*ki, *ki32, ki_fd); 1243 PTRTRIM_CP(*ki, *ki32, ki_vmspace); 1244 PTRTRIM_CP(*ki, *ki32, ki_wchan); 1245 CP(*ki, *ki32, ki_pid); 1246 CP(*ki, *ki32, ki_ppid); 1247 CP(*ki, *ki32, ki_pgid); 1248 CP(*ki, *ki32, ki_tpgid); 1249 CP(*ki, *ki32, ki_sid); 1250 CP(*ki, *ki32, ki_tsid); 1251 CP(*ki, *ki32, ki_jobc); 1252 CP(*ki, *ki32, ki_tdev); 1253 CP(*ki, *ki32, ki_siglist); 1254 CP(*ki, *ki32, ki_sigmask); 1255 CP(*ki, *ki32, ki_sigignore); 1256 CP(*ki, *ki32, ki_sigcatch); 1257 CP(*ki, *ki32, ki_uid); 1258 CP(*ki, *ki32, ki_ruid); 1259 CP(*ki, *ki32, ki_svuid); 1260 CP(*ki, *ki32, ki_rgid); 1261 CP(*ki, *ki32, ki_svgid); 1262 CP(*ki, *ki32, ki_ngroups); 1263 for (i = 0; i < KI_NGROUPS; i++) 1264 CP(*ki, *ki32, ki_groups[i]); 1265 CP(*ki, *ki32, ki_size); 1266 CP(*ki, *ki32, ki_rssize); 1267 CP(*ki, *ki32, ki_swrss); 1268 CP(*ki, *ki32, ki_tsize); 1269 CP(*ki, *ki32, ki_dsize); 1270 CP(*ki, *ki32, ki_ssize); 1271 CP(*ki, *ki32, ki_xstat); 1272 CP(*ki, *ki32, ki_acflag); 1273 CP(*ki, *ki32, ki_pctcpu); 1274 CP(*ki, *ki32, ki_estcpu); 1275 CP(*ki, *ki32, ki_slptime); 1276 CP(*ki, *ki32, ki_swtime); 1277 CP(*ki, *ki32, ki_cow); 1278 CP(*ki, *ki32, ki_runtime); 1279 TV_CP(*ki, *ki32, ki_start); 1280 TV_CP(*ki, *ki32, ki_childtime); 1281 CP(*ki, *ki32, ki_flag); 1282 CP(*ki, *ki32, ki_kiflag); 1283 CP(*ki, *ki32, ki_traceflag); 1284 CP(*ki, *ki32, ki_stat); 1285 CP(*ki, *ki32, ki_nice); 1286 CP(*ki, *ki32, ki_lock); 1287 CP(*ki, *ki32, ki_rqindex); 1288 CP(*ki, *ki32, ki_oncpu); 1289 CP(*ki, *ki32, ki_lastcpu); 1290 1291 /* XXX TODO: wrap cpu value as appropriate */ 1292 CP(*ki, *ki32, ki_oncpu_old); 1293 CP(*ki, *ki32, ki_lastcpu_old); 1294 1295 bcopy(ki->ki_tdname, ki32->ki_tdname, TDNAMLEN + 1); 1296 bcopy(ki->ki_wmesg, ki32->ki_wmesg, WMESGLEN + 1); 1297 bcopy(ki->ki_login, ki32->ki_login, LOGNAMELEN + 1); 1298 bcopy(ki->ki_lockname, ki32->ki_lockname, LOCKNAMELEN + 1); 1299 bcopy(ki->ki_comm, ki32->ki_comm, COMMLEN + 1); 1300 bcopy(ki->ki_emul, ki32->ki_emul, KI_EMULNAMELEN + 1); 1301 bcopy(ki->ki_loginclass, ki32->ki_loginclass, LOGINCLASSLEN + 1); 1302 bcopy(ki->ki_moretdname, ki32->ki_moretdname, MAXCOMLEN - TDNAMLEN + 1); 1303 CP(*ki, *ki32, ki_tracer); 1304 CP(*ki, *ki32, ki_flag2); 1305 CP(*ki, *ki32, ki_fibnum); 1306 CP(*ki, *ki32, ki_cr_flags); 1307 CP(*ki, *ki32, ki_jid); 1308 CP(*ki, *ki32, ki_numthreads); 1309 CP(*ki, *ki32, ki_tid); 1310 CP(*ki, *ki32, ki_pri); 1311 freebsd32_rusage_out(&ki->ki_rusage, &ki32->ki_rusage); 1312 freebsd32_rusage_out(&ki->ki_rusage_ch, &ki32->ki_rusage_ch); 1313 PTRTRIM_CP(*ki, *ki32, ki_pcb); 1314 PTRTRIM_CP(*ki, *ki32, ki_kstack); 1315 PTRTRIM_CP(*ki, *ki32, ki_udata); 1316 PTRTRIM_CP(*ki, *ki32, ki_tdaddr); 1317 CP(*ki, *ki32, ki_sflag); 1318 CP(*ki, *ki32, ki_tdflags); 1319} 1320#endif 1321 1322int 1323kern_proc_out(struct proc *p, struct sbuf *sb, int flags) 1324{ 1325 struct thread *td; 1326 struct kinfo_proc ki; 1327#ifdef COMPAT_FREEBSD32 1328 struct kinfo_proc32 ki32; 1329#endif 1330 int error; 1331 1332 PROC_LOCK_ASSERT(p, MA_OWNED); 1333 MPASS(FIRST_THREAD_IN_PROC(p) != NULL); 1334 1335 error = 0; 1336 fill_kinfo_proc(p, &ki); 1337 if ((flags & KERN_PROC_NOTHREADS) != 0) { 1338#ifdef COMPAT_FREEBSD32 1339 if ((flags & KERN_PROC_MASK32) != 0) { 1340 freebsd32_kinfo_proc_out(&ki, &ki32); 1341 if (sbuf_bcat(sb, &ki32, sizeof(ki32)) != 0) 1342 error = ENOMEM; 1343 } else 1344#endif 1345 if (sbuf_bcat(sb, &ki, sizeof(ki)) != 0) 1346 error = ENOMEM; 1347 } else { 1348 FOREACH_THREAD_IN_PROC(p, td) { 1349 fill_kinfo_thread(td, &ki, 1); 1350#ifdef COMPAT_FREEBSD32 1351 if ((flags & KERN_PROC_MASK32) != 0) { 1352 freebsd32_kinfo_proc_out(&ki, &ki32); 1353 if (sbuf_bcat(sb, &ki32, sizeof(ki32)) != 0) 1354 error = ENOMEM; 1355 } else 1356#endif 1357 if (sbuf_bcat(sb, &ki, sizeof(ki)) != 0) 1358 error = ENOMEM; 1359 if (error != 0) 1360 break; 1361 } 1362 } 1363 PROC_UNLOCK(p); 1364 return (error); 1365} 1366 1367static int 1368sysctl_out_proc(struct proc *p, struct sysctl_req *req, int flags, 1369 int doingzomb) 1370{ 1371 struct sbuf sb; 1372 struct kinfo_proc ki; 1373 struct proc *np; 1374 int error, error2; 1375 pid_t pid; 1376 1377 pid = p->p_pid; 1378 sbuf_new_for_sysctl(&sb, (char *)&ki, sizeof(ki), req); 1379 sbuf_clear_flags(&sb, SBUF_INCLUDENUL); 1380 error = kern_proc_out(p, &sb, flags); 1381 error2 = sbuf_finish(&sb); 1382 sbuf_delete(&sb); 1383 if (error != 0) 1384 return (error); 1385 else if (error2 != 0) 1386 return (error2); 1387 if (doingzomb) 1388 np = zpfind(pid); 1389 else { 1390 if (pid == 0) 1391 return (0); 1392 np = pfind(pid); 1393 } 1394 if (np == NULL) 1395 return (ESRCH); 1396 if (np != p) { 1397 PROC_UNLOCK(np); 1398 return (ESRCH); 1399 } 1400 PROC_UNLOCK(np); 1401 return (0); 1402} 1403 1404static int 1405sysctl_kern_proc(SYSCTL_HANDLER_ARGS) 1406{ 1407 int *name = (int *)arg1; 1408 u_int namelen = arg2; 1409 struct proc *p; 1410 int flags, doingzomb, oid_number; 1411 int error = 0; 1412 1413 oid_number = oidp->oid_number; 1414 if (oid_number != KERN_PROC_ALL && 1415 (oid_number & KERN_PROC_INC_THREAD) == 0) 1416 flags = KERN_PROC_NOTHREADS; 1417 else { 1418 flags = 0; 1419 oid_number &= ~KERN_PROC_INC_THREAD; 1420 } 1421#ifdef COMPAT_FREEBSD32 1422 if (req->flags & SCTL_MASK32) 1423 flags |= KERN_PROC_MASK32; 1424#endif 1425 if (oid_number == KERN_PROC_PID) { 1426 if (namelen != 1) 1427 return (EINVAL); 1428 error = sysctl_wire_old_buffer(req, 0); 1429 if (error) 1430 return (error); 1431 sx_slock(&proctree_lock); 1432 error = pget((pid_t)name[0], PGET_CANSEE, &p); 1433 if (error == 0) 1434 error = sysctl_out_proc(p, req, flags, 0); 1435 sx_sunlock(&proctree_lock); 1436 return (error); 1437 } 1438 1439 switch (oid_number) { 1440 case KERN_PROC_ALL: 1441 if (namelen != 0) 1442 return (EINVAL); 1443 break; 1444 case KERN_PROC_PROC: 1445 if (namelen != 0 && namelen != 1) 1446 return (EINVAL); 1447 break; 1448 default: 1449 if (namelen != 1) 1450 return (EINVAL); 1451 break; 1452 } 1453 1454 if (!req->oldptr) { 1455 /* overestimate by 5 procs */ 1456 error = SYSCTL_OUT(req, 0, sizeof (struct kinfo_proc) * 5); 1457 if (error) 1458 return (error); 1459 } 1460 error = sysctl_wire_old_buffer(req, 0); 1461 if (error != 0) 1462 return (error); 1463 sx_slock(&proctree_lock); 1464 sx_slock(&allproc_lock); 1465 for (doingzomb=0 ; doingzomb < 2 ; doingzomb++) { 1466 if (!doingzomb) 1467 p = LIST_FIRST(&allproc); 1468 else 1469 p = LIST_FIRST(&zombproc); 1470 for (; p != NULL; p = LIST_NEXT(p, p_list)) { 1471 /* 1472 * Skip embryonic processes. 1473 */ 1474 PROC_LOCK(p); 1475 if (p->p_state == PRS_NEW) { 1476 PROC_UNLOCK(p); 1477 continue; 1478 } 1479 KASSERT(p->p_ucred != NULL, 1480 ("process credential is NULL for non-NEW proc")); 1481 /* 1482 * Show a user only appropriate processes. 1483 */ 1484 if (p_cansee(curthread, p)) { 1485 PROC_UNLOCK(p); 1486 continue; 1487 } 1488 /* 1489 * TODO - make more efficient (see notes below). 1490 * do by session. 1491 */ 1492 switch (oid_number) { 1493 1494 case KERN_PROC_GID: 1495 if (p->p_ucred->cr_gid != (gid_t)name[0]) { 1496 PROC_UNLOCK(p); 1497 continue; 1498 } 1499 break; 1500 1501 case KERN_PROC_PGRP: 1502 /* could do this by traversing pgrp */ 1503 if (p->p_pgrp == NULL || 1504 p->p_pgrp->pg_id != (pid_t)name[0]) { 1505 PROC_UNLOCK(p); 1506 continue; 1507 } 1508 break; 1509 1510 case KERN_PROC_RGID: 1511 if (p->p_ucred->cr_rgid != (gid_t)name[0]) { 1512 PROC_UNLOCK(p); 1513 continue; 1514 } 1515 break; 1516 1517 case KERN_PROC_SESSION: 1518 if (p->p_session == NULL || 1519 p->p_session->s_sid != (pid_t)name[0]) { 1520 PROC_UNLOCK(p); 1521 continue; 1522 } 1523 break; 1524 1525 case KERN_PROC_TTY: 1526 if ((p->p_flag & P_CONTROLT) == 0 || 1527 p->p_session == NULL) { 1528 PROC_UNLOCK(p); 1529 continue; 1530 } 1531 /* XXX proctree_lock */ 1532 SESS_LOCK(p->p_session); 1533 if (p->p_session->s_ttyp == NULL || 1534 tty_udev(p->p_session->s_ttyp) != 1535 (dev_t)name[0]) { 1536 SESS_UNLOCK(p->p_session); 1537 PROC_UNLOCK(p); 1538 continue; 1539 } 1540 SESS_UNLOCK(p->p_session); 1541 break; 1542 1543 case KERN_PROC_UID: 1544 if (p->p_ucred->cr_uid != (uid_t)name[0]) { 1545 PROC_UNLOCK(p); 1546 continue; 1547 } 1548 break; 1549 1550 case KERN_PROC_RUID: 1551 if (p->p_ucred->cr_ruid != (uid_t)name[0]) { 1552 PROC_UNLOCK(p); 1553 continue; 1554 } 1555 break; 1556 1557 case KERN_PROC_PROC: 1558 break; 1559 1560 default: 1561 break; 1562 1563 } 1564 1565 error = sysctl_out_proc(p, req, flags, doingzomb); 1566 if (error) { 1567 sx_sunlock(&allproc_lock); 1568 sx_sunlock(&proctree_lock); 1569 return (error); 1570 } 1571 } 1572 } 1573 sx_sunlock(&allproc_lock); 1574 sx_sunlock(&proctree_lock); 1575 return (0); 1576} 1577 1578struct pargs * 1579pargs_alloc(int len) 1580{ 1581 struct pargs *pa; 1582 1583 pa = malloc(sizeof(struct pargs) + len, M_PARGS, 1584 M_WAITOK); 1585 refcount_init(&pa->ar_ref, 1); 1586 pa->ar_length = len; 1587 return (pa); 1588} 1589 1590static void 1591pargs_free(struct pargs *pa) 1592{ 1593 1594 free(pa, M_PARGS); 1595} 1596 1597void 1598pargs_hold(struct pargs *pa) 1599{ 1600 1601 if (pa == NULL) 1602 return; 1603 refcount_acquire(&pa->ar_ref); 1604} 1605 1606void 1607pargs_drop(struct pargs *pa) 1608{ 1609 1610 if (pa == NULL) 1611 return; 1612 if (refcount_release(&pa->ar_ref)) 1613 pargs_free(pa); 1614} 1615 1616static int 1617proc_read_string(struct thread *td, struct proc *p, const char *sptr, char *buf, 1618 size_t len) 1619{ 1620 ssize_t n; 1621 1622 /* 1623 * This may return a short read if the string is shorter than the chunk 1624 * and is aligned at the end of the page, and the following page is not 1625 * mapped. 1626 */ 1627 n = proc_readmem(td, p, (vm_offset_t)sptr, buf, len); 1628 if (n <= 0) 1629 return (ENOMEM); 1630 return (0); 1631} 1632 1633#define PROC_AUXV_MAX 256 /* Safety limit on auxv size. */ 1634 1635enum proc_vector_type { 1636 PROC_ARG, 1637 PROC_ENV, 1638 PROC_AUX, 1639}; 1640 1641#ifdef COMPAT_FREEBSD32 1642static int 1643get_proc_vector32(struct thread *td, struct proc *p, char ***proc_vectorp, 1644 size_t *vsizep, enum proc_vector_type type) 1645{ 1646 struct freebsd32_ps_strings pss; 1647 Elf32_Auxinfo aux; 1648 vm_offset_t vptr, ptr; 1649 uint32_t *proc_vector32; 1650 char **proc_vector; 1651 size_t vsize, size; 1652 int i, error; 1653 1654 error = 0; 1655 if (proc_readmem(td, p, (vm_offset_t)p->p_sysent->sv_psstrings, &pss, 1656 sizeof(pss)) != sizeof(pss)) 1657 return (ENOMEM); 1658 switch (type) { 1659 case PROC_ARG: 1660 vptr = (vm_offset_t)PTRIN(pss.ps_argvstr); 1661 vsize = pss.ps_nargvstr; 1662 if (vsize > ARG_MAX) 1663 return (ENOEXEC); 1664 size = vsize * sizeof(int32_t); 1665 break; 1666 case PROC_ENV: 1667 vptr = (vm_offset_t)PTRIN(pss.ps_envstr); 1668 vsize = pss.ps_nenvstr; 1669 if (vsize > ARG_MAX) 1670 return (ENOEXEC); 1671 size = vsize * sizeof(int32_t); 1672 break; 1673 case PROC_AUX: 1674 vptr = (vm_offset_t)PTRIN(pss.ps_envstr) + 1675 (pss.ps_nenvstr + 1) * sizeof(int32_t); 1676 if (vptr % 4 != 0) 1677 return (ENOEXEC); 1678 for (ptr = vptr, i = 0; i < PROC_AUXV_MAX; i++) { 1679 if (proc_readmem(td, p, ptr, &aux, sizeof(aux)) != 1680 sizeof(aux)) 1681 return (ENOMEM); 1682 if (aux.a_type == AT_NULL) 1683 break; 1684 ptr += sizeof(aux); 1685 } 1686 if (aux.a_type != AT_NULL) 1687 return (ENOEXEC); 1688 vsize = i + 1; 1689 size = vsize * sizeof(aux); 1690 break; 1691 default: 1692 KASSERT(0, ("Wrong proc vector type: %d", type)); 1693 return (EINVAL); 1694 } 1695 proc_vector32 = malloc(size, M_TEMP, M_WAITOK); 1696 if (proc_readmem(td, p, vptr, proc_vector32, size) != size) { 1697 error = ENOMEM; 1698 goto done; 1699 } 1700 if (type == PROC_AUX) { 1701 *proc_vectorp = (char **)proc_vector32; 1702 *vsizep = vsize; 1703 return (0); 1704 } 1705 proc_vector = malloc(vsize * sizeof(char *), M_TEMP, M_WAITOK); 1706 for (i = 0; i < (int)vsize; i++) 1707 proc_vector[i] = PTRIN(proc_vector32[i]); 1708 *proc_vectorp = proc_vector; 1709 *vsizep = vsize; 1710done: 1711 free(proc_vector32, M_TEMP); 1712 return (error); 1713} 1714#endif 1715 1716static int 1717get_proc_vector(struct thread *td, struct proc *p, char ***proc_vectorp, 1718 size_t *vsizep, enum proc_vector_type type) 1719{ 1720 struct ps_strings pss; 1721 Elf_Auxinfo aux; 1722 vm_offset_t vptr, ptr; 1723 char **proc_vector; 1724 size_t vsize, size; 1725 int i; 1726 1727#ifdef COMPAT_FREEBSD32 1728 if (SV_PROC_FLAG(p, SV_ILP32) != 0) 1729 return (get_proc_vector32(td, p, proc_vectorp, vsizep, type)); 1730#endif 1731 if (proc_readmem(td, p, (vm_offset_t)p->p_sysent->sv_psstrings, &pss, 1732 sizeof(pss)) != sizeof(pss)) 1733 return (ENOMEM); 1734 switch (type) { 1735 case PROC_ARG: 1736 vptr = (vm_offset_t)pss.ps_argvstr; 1737 vsize = pss.ps_nargvstr; 1738 if (vsize > ARG_MAX) 1739 return (ENOEXEC); 1740 size = vsize * sizeof(char *); 1741 break; 1742 case PROC_ENV: 1743 vptr = (vm_offset_t)pss.ps_envstr; 1744 vsize = pss.ps_nenvstr; 1745 if (vsize > ARG_MAX) 1746 return (ENOEXEC); 1747 size = vsize * sizeof(char *); 1748 break; 1749 case PROC_AUX: 1750 /* 1751 * The aux array is just above env array on the stack. Check 1752 * that the address is naturally aligned. 1753 */ 1754 vptr = (vm_offset_t)pss.ps_envstr + (pss.ps_nenvstr + 1) 1755 * sizeof(char *); 1756#if __ELF_WORD_SIZE == 64 1757 if (vptr % sizeof(uint64_t) != 0) 1758#else 1759 if (vptr % sizeof(uint32_t) != 0) 1760#endif 1761 return (ENOEXEC); 1762 /* 1763 * We count the array size reading the aux vectors from the 1764 * stack until AT_NULL vector is returned. So (to keep the code 1765 * simple) we read the process stack twice: the first time here 1766 * to find the size and the second time when copying the vectors 1767 * to the allocated proc_vector. 1768 */ 1769 for (ptr = vptr, i = 0; i < PROC_AUXV_MAX; i++) { 1770 if (proc_readmem(td, p, ptr, &aux, sizeof(aux)) != 1771 sizeof(aux)) 1772 return (ENOMEM); 1773 if (aux.a_type == AT_NULL) 1774 break; 1775 ptr += sizeof(aux); 1776 } 1777 /* 1778 * If the PROC_AUXV_MAX entries are iterated over, and we have 1779 * not reached AT_NULL, it is most likely we are reading wrong 1780 * data: either the process doesn't have auxv array or data has 1781 * been modified. Return the error in this case. 1782 */ 1783 if (aux.a_type != AT_NULL) 1784 return (ENOEXEC); 1785 vsize = i + 1; 1786 size = vsize * sizeof(aux); 1787 break; 1788 default: 1789 KASSERT(0, ("Wrong proc vector type: %d", type)); 1790 return (EINVAL); /* In case we are built without INVARIANTS. */ 1791 } 1792 proc_vector = malloc(size, M_TEMP, M_WAITOK); 1793 if (proc_readmem(td, p, vptr, proc_vector, size) != size) { 1794 free(proc_vector, M_TEMP); 1795 return (ENOMEM); 1796 } 1797 *proc_vectorp = proc_vector; 1798 *vsizep = vsize; 1799 1800 return (0); 1801} 1802 1803#define GET_PS_STRINGS_CHUNK_SZ 256 /* Chunk size (bytes) for ps_strings operations. */ 1804 1805static int 1806get_ps_strings(struct thread *td, struct proc *p, struct sbuf *sb, 1807 enum proc_vector_type type) 1808{ 1809 size_t done, len, nchr, vsize; 1810 int error, i; 1811 char **proc_vector, *sptr; 1812 char pss_string[GET_PS_STRINGS_CHUNK_SZ]; 1813 1814 PROC_ASSERT_HELD(p); 1815 1816 /* 1817 * We are not going to read more than 2 * (PATH_MAX + ARG_MAX) bytes. 1818 */ 1819 nchr = 2 * (PATH_MAX + ARG_MAX); 1820 1821 error = get_proc_vector(td, p, &proc_vector, &vsize, type); 1822 if (error != 0) 1823 return (error); 1824 for (done = 0, i = 0; i < (int)vsize && done < nchr; i++) { 1825 /* 1826 * The program may have scribbled into its argv array, e.g. to 1827 * remove some arguments. If that has happened, break out 1828 * before trying to read from NULL. 1829 */ 1830 if (proc_vector[i] == NULL) 1831 break; 1832 for (sptr = proc_vector[i]; ; sptr += GET_PS_STRINGS_CHUNK_SZ) { 1833 error = proc_read_string(td, p, sptr, pss_string, 1834 sizeof(pss_string)); 1835 if (error != 0) 1836 goto done; 1837 len = strnlen(pss_string, GET_PS_STRINGS_CHUNK_SZ); 1838 if (done + len >= nchr) 1839 len = nchr - done - 1; 1840 sbuf_bcat(sb, pss_string, len); 1841 if (len != GET_PS_STRINGS_CHUNK_SZ) 1842 break; 1843 done += GET_PS_STRINGS_CHUNK_SZ; 1844 } 1845 sbuf_bcat(sb, "", 1); 1846 done += len + 1; 1847 } 1848done: 1849 free(proc_vector, M_TEMP); 1850 return (error); 1851} 1852 1853int 1854proc_getargv(struct thread *td, struct proc *p, struct sbuf *sb) 1855{ 1856 1857 return (get_ps_strings(curthread, p, sb, PROC_ARG)); 1858} 1859 1860int 1861proc_getenvv(struct thread *td, struct proc *p, struct sbuf *sb) 1862{ 1863 1864 return (get_ps_strings(curthread, p, sb, PROC_ENV)); 1865} 1866 1867int 1868proc_getauxv(struct thread *td, struct proc *p, struct sbuf *sb) 1869{ 1870 size_t vsize, size; 1871 char **auxv; 1872 int error; 1873 1874 error = get_proc_vector(td, p, &auxv, &vsize, PROC_AUX); 1875 if (error == 0) { 1876#ifdef COMPAT_FREEBSD32 1877 if (SV_PROC_FLAG(p, SV_ILP32) != 0) 1878 size = vsize * sizeof(Elf32_Auxinfo); 1879 else 1880#endif 1881 size = vsize * sizeof(Elf_Auxinfo); 1882 if (sbuf_bcat(sb, auxv, size) != 0) 1883 error = ENOMEM; 1884 free(auxv, M_TEMP); 1885 } 1886 return (error); 1887} 1888 1889/* 1890 * This sysctl allows a process to retrieve the argument list or process 1891 * title for another process without groping around in the address space 1892 * of the other process. It also allow a process to set its own "process 1893 * title to a string of its own choice. 1894 */ 1895static int 1896sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS) 1897{ 1898 int *name = (int *)arg1; 1899 u_int namelen = arg2; 1900 struct pargs *newpa, *pa; 1901 struct proc *p; 1902 struct sbuf sb; 1903 int flags, error = 0, error2; 1904 1905 if (namelen != 1) 1906 return (EINVAL); 1907 1908 flags = PGET_CANSEE; 1909 if (req->newptr != NULL) 1910 flags |= PGET_ISCURRENT; 1911 error = pget((pid_t)name[0], flags, &p); 1912 if (error) 1913 return (error); 1914 1915 pa = p->p_args; 1916 if (pa != NULL) { 1917 pargs_hold(pa); 1918 PROC_UNLOCK(p); 1919 error = SYSCTL_OUT(req, pa->ar_args, pa->ar_length); 1920 pargs_drop(pa); 1921 } else if ((p->p_flag & (P_WEXIT | P_SYSTEM)) == 0) { 1922 _PHOLD(p); 1923 PROC_UNLOCK(p); 1924 sbuf_new_for_sysctl(&sb, NULL, GET_PS_STRINGS_CHUNK_SZ, req); 1925 sbuf_clear_flags(&sb, SBUF_INCLUDENUL); 1926 error = proc_getargv(curthread, p, &sb); 1927 error2 = sbuf_finish(&sb); 1928 PRELE(p); 1929 sbuf_delete(&sb); 1930 if (error == 0 && error2 != 0) 1931 error = error2; 1932 } else { 1933 PROC_UNLOCK(p); 1934 } 1935 if (error != 0 || req->newptr == NULL) 1936 return (error); 1937 1938 if (req->newlen > ps_arg_cache_limit - sizeof(struct pargs)) 1939 return (ENOMEM); 1940 newpa = pargs_alloc(req->newlen); 1941 error = SYSCTL_IN(req, newpa->ar_args, req->newlen); 1942 if (error != 0) { 1943 pargs_free(newpa); 1944 return (error); 1945 } 1946 PROC_LOCK(p); 1947 pa = p->p_args; 1948 p->p_args = newpa; 1949 PROC_UNLOCK(p); 1950 pargs_drop(pa); 1951 return (0); 1952} 1953 1954/* 1955 * This sysctl allows a process to retrieve environment of another process. 1956 */ 1957static int 1958sysctl_kern_proc_env(SYSCTL_HANDLER_ARGS) 1959{ 1960 int *name = (int *)arg1; 1961 u_int namelen = arg2; 1962 struct proc *p; 1963 struct sbuf sb; 1964 int error, error2; 1965 1966 if (namelen != 1) 1967 return (EINVAL); 1968 1969 error = pget((pid_t)name[0], PGET_WANTREAD, &p); 1970 if (error != 0) 1971 return (error); 1972 if ((p->p_flag & P_SYSTEM) != 0) { 1973 PRELE(p); 1974 return (0); 1975 } 1976 1977 sbuf_new_for_sysctl(&sb, NULL, GET_PS_STRINGS_CHUNK_SZ, req); 1978 sbuf_clear_flags(&sb, SBUF_INCLUDENUL); 1979 error = proc_getenvv(curthread, p, &sb); 1980 error2 = sbuf_finish(&sb); 1981 PRELE(p); 1982 sbuf_delete(&sb); 1983 return (error != 0 ? error : error2); 1984} 1985 1986/* 1987 * This sysctl allows a process to retrieve ELF auxiliary vector of 1988 * another process. 1989 */ 1990static int 1991sysctl_kern_proc_auxv(SYSCTL_HANDLER_ARGS) 1992{ 1993 int *name = (int *)arg1; 1994 u_int namelen = arg2; 1995 struct proc *p; 1996 struct sbuf sb; 1997 int error, error2; 1998 1999 if (namelen != 1) 2000 return (EINVAL); 2001 2002 error = pget((pid_t)name[0], PGET_WANTREAD, &p); 2003 if (error != 0) 2004 return (error); 2005 if ((p->p_flag & P_SYSTEM) != 0) { 2006 PRELE(p); 2007 return (0); 2008 } 2009 sbuf_new_for_sysctl(&sb, NULL, GET_PS_STRINGS_CHUNK_SZ, req); 2010 sbuf_clear_flags(&sb, SBUF_INCLUDENUL); 2011 error = proc_getauxv(curthread, p, &sb); 2012 error2 = sbuf_finish(&sb); 2013 PRELE(p); 2014 sbuf_delete(&sb); 2015 return (error != 0 ? error : error2); 2016} 2017 2018/* 2019 * This sysctl allows a process to retrieve the path of the executable for 2020 * itself or another process. 2021 */ 2022static int 2023sysctl_kern_proc_pathname(SYSCTL_HANDLER_ARGS) 2024{ 2025 pid_t *pidp = (pid_t *)arg1; 2026 unsigned int arglen = arg2; 2027 struct proc *p; 2028 struct vnode *vp; 2029 char *retbuf, *freebuf; 2030 int error; 2031 2032 if (arglen != 1) 2033 return (EINVAL); 2034 if (*pidp == -1) { /* -1 means this process */ 2035 p = req->td->td_proc; 2036 } else { 2037 error = pget(*pidp, PGET_CANSEE, &p); 2038 if (error != 0) 2039 return (error); 2040 } 2041 2042 vp = p->p_textvp; 2043 if (vp == NULL) { 2044 if (*pidp != -1) 2045 PROC_UNLOCK(p); 2046 return (0); 2047 } 2048 vref(vp); 2049 if (*pidp != -1) 2050 PROC_UNLOCK(p); 2051 error = vn_fullpath(req->td, vp, &retbuf, &freebuf); 2052 vrele(vp); 2053 if (error) 2054 return (error); 2055 error = SYSCTL_OUT(req, retbuf, strlen(retbuf) + 1); 2056 free(freebuf, M_TEMP); 2057 return (error); 2058} 2059 2060static int 2061sysctl_kern_proc_sv_name(SYSCTL_HANDLER_ARGS) 2062{ 2063 struct proc *p; 2064 char *sv_name; 2065 int *name; 2066 int namelen; 2067 int error; 2068 2069 namelen = arg2; 2070 if (namelen != 1) 2071 return (EINVAL); 2072 2073 name = (int *)arg1; 2074 error = pget((pid_t)name[0], PGET_CANSEE, &p); 2075 if (error != 0) 2076 return (error); 2077 sv_name = p->p_sysent->sv_name; 2078 PROC_UNLOCK(p); 2079 return (sysctl_handle_string(oidp, sv_name, 0, req)); 2080} 2081 2082#ifdef KINFO_OVMENTRY_SIZE 2083CTASSERT(sizeof(struct kinfo_ovmentry) == KINFO_OVMENTRY_SIZE); 2084#endif 2085 2086#ifdef COMPAT_FREEBSD7 2087static int 2088sysctl_kern_proc_ovmmap(SYSCTL_HANDLER_ARGS) 2089{ 2090 vm_map_entry_t entry, tmp_entry; 2091 unsigned int last_timestamp; 2092 char *fullpath, *freepath; 2093 struct kinfo_ovmentry *kve; 2094 struct vattr va; 2095 struct ucred *cred; 2096 int error, *name; 2097 struct vnode *vp; 2098 struct proc *p; 2099 vm_map_t map; 2100 struct vmspace *vm; 2101 2102 name = (int *)arg1; 2103 error = pget((pid_t)name[0], PGET_WANTREAD, &p); 2104 if (error != 0) 2105 return (error); 2106 vm = vmspace_acquire_ref(p); 2107 if (vm == NULL) { 2108 PRELE(p); 2109 return (ESRCH); 2110 } 2111 kve = malloc(sizeof(*kve), M_TEMP, M_WAITOK); 2112 2113 map = &vm->vm_map; 2114 vm_map_lock_read(map); 2115 for (entry = map->header.next; entry != &map->header; 2116 entry = entry->next) { 2117 vm_object_t obj, tobj, lobj; 2118 vm_offset_t addr; 2119 2120 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) 2121 continue; 2122 2123 bzero(kve, sizeof(*kve)); 2124 kve->kve_structsize = sizeof(*kve); 2125 2126 kve->kve_private_resident = 0; 2127 obj = entry->object.vm_object; 2128 if (obj != NULL) { 2129 VM_OBJECT_RLOCK(obj); 2130 if (obj->shadow_count == 1) 2131 kve->kve_private_resident = 2132 obj->resident_page_count; 2133 } 2134 kve->kve_resident = 0; 2135 addr = entry->start; 2136 while (addr < entry->end) { 2137 if (pmap_extract(map->pmap, addr)) 2138 kve->kve_resident++; 2139 addr += PAGE_SIZE; 2140 } 2141 2142 for (lobj = tobj = obj; tobj; tobj = tobj->backing_object) { 2143 if (tobj != obj) { 2144 VM_OBJECT_RLOCK(tobj); 2145 kve->kve_offset += tobj->backing_object_offset; 2146 } 2147 if (lobj != obj) 2148 VM_OBJECT_RUNLOCK(lobj); 2149 lobj = tobj; 2150 } 2151 2152 kve->kve_start = (void*)entry->start; 2153 kve->kve_end = (void*)entry->end; 2154 kve->kve_offset += (off_t)entry->offset; 2155 2156 if (entry->protection & VM_PROT_READ) 2157 kve->kve_protection |= KVME_PROT_READ; 2158 if (entry->protection & VM_PROT_WRITE) 2159 kve->kve_protection |= KVME_PROT_WRITE; 2160 if (entry->protection & VM_PROT_EXECUTE) 2161 kve->kve_protection |= KVME_PROT_EXEC; 2162 2163 if (entry->eflags & MAP_ENTRY_COW) 2164 kve->kve_flags |= KVME_FLAG_COW; 2165 if (entry->eflags & MAP_ENTRY_NEEDS_COPY) 2166 kve->kve_flags |= KVME_FLAG_NEEDS_COPY; 2167 if (entry->eflags & MAP_ENTRY_NOCOREDUMP) 2168 kve->kve_flags |= KVME_FLAG_NOCOREDUMP; 2169 2170 last_timestamp = map->timestamp; 2171 vm_map_unlock_read(map); 2172 2173 kve->kve_fileid = 0; 2174 kve->kve_fsid = 0; 2175 freepath = NULL; 2176 fullpath = ""; 2177 if (lobj) { 2178 vp = NULL; 2179 switch (lobj->type) { 2180 case OBJT_DEFAULT: 2181 kve->kve_type = KVME_TYPE_DEFAULT; 2182 break; 2183 case OBJT_VNODE: 2184 kve->kve_type = KVME_TYPE_VNODE; 2185 vp = lobj->handle; 2186 vref(vp); 2187 break; 2188 case OBJT_SWAP: 2189 if ((lobj->flags & OBJ_TMPFS_NODE) != 0) { 2190 kve->kve_type = KVME_TYPE_VNODE; 2191 if ((lobj->flags & OBJ_TMPFS) != 0) { 2192 vp = lobj->un_pager.swp.swp_tmpfs; 2193 vref(vp); 2194 } 2195 } else { 2196 kve->kve_type = KVME_TYPE_SWAP; 2197 } 2198 break; 2199 case OBJT_DEVICE: 2200 kve->kve_type = KVME_TYPE_DEVICE; 2201 break; 2202 case OBJT_PHYS: 2203 kve->kve_type = KVME_TYPE_PHYS; 2204 break; 2205 case OBJT_DEAD: 2206 kve->kve_type = KVME_TYPE_DEAD; 2207 break; 2208 case OBJT_SG: 2209 kve->kve_type = KVME_TYPE_SG; 2210 break; 2211 default: 2212 kve->kve_type = KVME_TYPE_UNKNOWN; 2213 break; 2214 } 2215 if (lobj != obj) 2216 VM_OBJECT_RUNLOCK(lobj); 2217 2218 kve->kve_ref_count = obj->ref_count; 2219 kve->kve_shadow_count = obj->shadow_count; 2220 VM_OBJECT_RUNLOCK(obj); 2221 if (vp != NULL) { 2222 vn_fullpath(curthread, vp, &fullpath, 2223 &freepath); 2224 cred = curthread->td_ucred; 2225 vn_lock(vp, LK_SHARED | LK_RETRY); 2226 if (VOP_GETATTR(vp, &va, cred) == 0) { 2227 kve->kve_fileid = va.va_fileid; 2228 kve->kve_fsid = va.va_fsid; 2229 } 2230 vput(vp); 2231 } 2232 } else { 2233 kve->kve_type = KVME_TYPE_NONE; 2234 kve->kve_ref_count = 0; 2235 kve->kve_shadow_count = 0; 2236 } 2237 2238 strlcpy(kve->kve_path, fullpath, sizeof(kve->kve_path)); 2239 if (freepath != NULL) 2240 free(freepath, M_TEMP); 2241 2242 error = SYSCTL_OUT(req, kve, sizeof(*kve)); 2243 vm_map_lock_read(map); 2244 if (error) 2245 break; 2246 if (last_timestamp != map->timestamp) { 2247 vm_map_lookup_entry(map, addr - 1, &tmp_entry); 2248 entry = tmp_entry; 2249 } 2250 } 2251 vm_map_unlock_read(map); 2252 vmspace_free(vm); 2253 PRELE(p); 2254 free(kve, M_TEMP); 2255 return (error); 2256} 2257#endif /* COMPAT_FREEBSD7 */ 2258 2259#ifdef KINFO_VMENTRY_SIZE 2260CTASSERT(sizeof(struct kinfo_vmentry) == KINFO_VMENTRY_SIZE); 2261#endif 2262 2263void 2264kern_proc_vmmap_resident(vm_map_t map, vm_map_entry_t entry, 2265 int *resident_count, bool *super) 2266{ 2267 vm_object_t obj, tobj; 2268 vm_page_t m, m_adv; 2269 vm_offset_t addr; 2270 vm_paddr_t locked_pa; 2271 vm_pindex_t pi, pi_adv, pindex; 2272 2273 *super = false; 2274 *resident_count = 0; 2275 if (vmmap_skip_res_cnt) 2276 return; 2277 2278 locked_pa = 0; 2279 obj = entry->object.vm_object; 2280 addr = entry->start; 2281 m_adv = NULL; 2282 pi = OFF_TO_IDX(entry->offset); 2283 for (; addr < entry->end; addr += IDX_TO_OFF(pi_adv), pi += pi_adv) { 2284 if (m_adv != NULL) { 2285 m = m_adv; 2286 } else { 2287 pi_adv = atop(entry->end - addr); 2288 pindex = pi; 2289 for (tobj = obj;; tobj = tobj->backing_object) { 2290 m = vm_page_find_least(tobj, pindex); 2291 if (m != NULL) { 2292 if (m->pindex == pindex) 2293 break; 2294 if (pi_adv > m->pindex - pindex) { 2295 pi_adv = m->pindex - pindex; 2296 m_adv = m; 2297 } 2298 } 2299 if (tobj->backing_object == NULL) 2300 goto next; 2301 pindex += OFF_TO_IDX(tobj-> 2302 backing_object_offset); 2303 } 2304 } 2305 m_adv = NULL; 2306 if (m->psind != 0 && addr + pagesizes[1] <= entry->end && 2307 (addr & (pagesizes[1] - 1)) == 0 && 2308 (pmap_mincore(map->pmap, addr, &locked_pa) & 2309 MINCORE_SUPER) != 0) { 2310 *super = true; 2311 pi_adv = atop(pagesizes[1]); 2312 } else { 2313 /* 2314 * We do not test the found page on validity. 2315 * Either the page is busy and being paged in, 2316 * or it was invalidated. The first case 2317 * should be counted as resident, the second 2318 * is not so clear; we do account both. 2319 */ 2320 pi_adv = 1; 2321 } 2322 *resident_count += pi_adv; 2323next:; 2324 } 2325 PA_UNLOCK_COND(locked_pa); 2326} 2327 2328/* 2329 * Must be called with the process locked and will return unlocked. 2330 */ 2331int 2332kern_proc_vmmap_out(struct proc *p, struct sbuf *sb, ssize_t maxlen, int flags) 2333{ 2334 vm_map_entry_t entry, tmp_entry; 2335 struct vattr va; 2336 vm_map_t map; 2337 vm_object_t obj, tobj, lobj; 2338 char *fullpath, *freepath; 2339 struct kinfo_vmentry *kve; 2340 struct ucred *cred; 2341 struct vnode *vp; 2342 struct vmspace *vm; 2343 vm_offset_t addr; 2344 unsigned int last_timestamp; 2345 int error; 2346 bool super; 2347 2348 PROC_LOCK_ASSERT(p, MA_OWNED); 2349 2350 _PHOLD(p); 2351 PROC_UNLOCK(p); 2352 vm = vmspace_acquire_ref(p); 2353 if (vm == NULL) { 2354 PRELE(p); 2355 return (ESRCH); 2356 } 2357 kve = malloc(sizeof(*kve), M_TEMP, M_WAITOK | M_ZERO); 2358 2359 error = 0; 2360 map = &vm->vm_map; 2361 vm_map_lock_read(map); 2362 for (entry = map->header.next; entry != &map->header; 2363 entry = entry->next) { 2364 if (entry->eflags & MAP_ENTRY_IS_SUB_MAP) 2365 continue; 2366 2367 addr = entry->end; 2368 bzero(kve, sizeof(*kve)); 2369 obj = entry->object.vm_object; 2370 if (obj != NULL) { 2371 for (tobj = obj; tobj != NULL; 2372 tobj = tobj->backing_object) { 2373 VM_OBJECT_RLOCK(tobj); 2374 kve->kve_offset += tobj->backing_object_offset; 2375 lobj = tobj; 2376 } 2377 if (obj->backing_object == NULL) 2378 kve->kve_private_resident = 2379 obj->resident_page_count; 2380 kern_proc_vmmap_resident(map, entry, 2381 &kve->kve_resident, &super); 2382 if (super) 2383 kve->kve_flags |= KVME_FLAG_SUPER; 2384 for (tobj = obj; tobj != NULL; 2385 tobj = tobj->backing_object) { 2386 if (tobj != obj && tobj != lobj) 2387 VM_OBJECT_RUNLOCK(tobj); 2388 } 2389 } else { 2390 lobj = NULL; 2391 } 2392 2393 kve->kve_start = entry->start; 2394 kve->kve_end = entry->end; 2395 kve->kve_offset += entry->offset; 2396 2397 if (entry->protection & VM_PROT_READ) 2398 kve->kve_protection |= KVME_PROT_READ; 2399 if (entry->protection & VM_PROT_WRITE) 2400 kve->kve_protection |= KVME_PROT_WRITE; 2401 if (entry->protection & VM_PROT_EXECUTE) 2402 kve->kve_protection |= KVME_PROT_EXEC; 2403 2404 if (entry->eflags & MAP_ENTRY_COW) 2405 kve->kve_flags |= KVME_FLAG_COW; 2406 if (entry->eflags & MAP_ENTRY_NEEDS_COPY) 2407 kve->kve_flags |= KVME_FLAG_NEEDS_COPY; 2408 if (entry->eflags & MAP_ENTRY_NOCOREDUMP) 2409 kve->kve_flags |= KVME_FLAG_NOCOREDUMP; 2410 if (entry->eflags & MAP_ENTRY_GROWS_UP) 2411 kve->kve_flags |= KVME_FLAG_GROWS_UP; 2412 if (entry->eflags & MAP_ENTRY_GROWS_DOWN) 2413 kve->kve_flags |= KVME_FLAG_GROWS_DOWN; 2414 2415 last_timestamp = map->timestamp; 2416 vm_map_unlock_read(map); 2417 2418 freepath = NULL; 2419 fullpath = ""; 2420 if (lobj != NULL) { 2421 vp = NULL; 2422 switch (lobj->type) { 2423 case OBJT_DEFAULT: 2424 kve->kve_type = KVME_TYPE_DEFAULT; 2425 break; 2426 case OBJT_VNODE: 2427 kve->kve_type = KVME_TYPE_VNODE; 2428 vp = lobj->handle; 2429 vref(vp); 2430 break; 2431 case OBJT_SWAP: 2432 if ((lobj->flags & OBJ_TMPFS_NODE) != 0) { 2433 kve->kve_type = KVME_TYPE_VNODE; 2434 if ((lobj->flags & OBJ_TMPFS) != 0) { 2435 vp = lobj->un_pager.swp.swp_tmpfs; 2436 vref(vp); 2437 } 2438 } else { 2439 kve->kve_type = KVME_TYPE_SWAP; 2440 } 2441 break; 2442 case OBJT_DEVICE: 2443 kve->kve_type = KVME_TYPE_DEVICE; 2444 break; 2445 case OBJT_PHYS: 2446 kve->kve_type = KVME_TYPE_PHYS; 2447 break; 2448 case OBJT_DEAD: 2449 kve->kve_type = KVME_TYPE_DEAD; 2450 break; 2451 case OBJT_SG: 2452 kve->kve_type = KVME_TYPE_SG; 2453 break; 2454 case OBJT_MGTDEVICE: 2455 kve->kve_type = KVME_TYPE_MGTDEVICE; 2456 break; 2457 default: 2458 kve->kve_type = KVME_TYPE_UNKNOWN; 2459 break; 2460 } 2461 if (lobj != obj) 2462 VM_OBJECT_RUNLOCK(lobj); 2463 2464 kve->kve_ref_count = obj->ref_count; 2465 kve->kve_shadow_count = obj->shadow_count; 2466 VM_OBJECT_RUNLOCK(obj); 2467 if (vp != NULL) { 2468 vn_fullpath(curthread, vp, &fullpath, 2469 &freepath); 2470 kve->kve_vn_type = vntype_to_kinfo(vp->v_type); 2471 cred = curthread->td_ucred; 2472 vn_lock(vp, LK_SHARED | LK_RETRY); 2473 if (VOP_GETATTR(vp, &va, cred) == 0) { 2474 kve->kve_vn_fileid = va.va_fileid; 2475 kve->kve_vn_fsid = va.va_fsid; 2476 kve->kve_vn_mode = 2477 MAKEIMODE(va.va_type, va.va_mode); 2478 kve->kve_vn_size = va.va_size; 2479 kve->kve_vn_rdev = va.va_rdev; 2480 kve->kve_status = KF_ATTR_VALID; 2481 } 2482 vput(vp); 2483 } 2484 } else { 2485 kve->kve_type = KVME_TYPE_NONE; 2486 kve->kve_ref_count = 0; 2487 kve->kve_shadow_count = 0; 2488 } 2489 2490 strlcpy(kve->kve_path, fullpath, sizeof(kve->kve_path)); 2491 if (freepath != NULL) 2492 free(freepath, M_TEMP); 2493 2494 /* Pack record size down */ 2495 if ((flags & KERN_VMMAP_PACK_KINFO) != 0) 2496 kve->kve_structsize = 2497 offsetof(struct kinfo_vmentry, kve_path) + 2498 strlen(kve->kve_path) + 1; 2499 else 2500 kve->kve_structsize = sizeof(*kve); 2501 kve->kve_structsize = roundup(kve->kve_structsize, 2502 sizeof(uint64_t)); 2503 2504 /* Halt filling and truncate rather than exceeding maxlen */ 2505 if (maxlen != -1 && maxlen < kve->kve_structsize) { 2506 error = 0; 2507 vm_map_lock_read(map); 2508 break; 2509 } else if (maxlen != -1) 2510 maxlen -= kve->kve_structsize; 2511 2512 if (sbuf_bcat(sb, kve, kve->kve_structsize) != 0) 2513 error = ENOMEM; 2514 vm_map_lock_read(map); 2515 if (error != 0) 2516 break; 2517 if (last_timestamp != map->timestamp) { 2518 vm_map_lookup_entry(map, addr - 1, &tmp_entry); 2519 entry = tmp_entry; 2520 } 2521 } 2522 vm_map_unlock_read(map); 2523 vmspace_free(vm); 2524 PRELE(p); 2525 free(kve, M_TEMP); 2526 return (error); 2527} 2528 2529static int 2530sysctl_kern_proc_vmmap(SYSCTL_HANDLER_ARGS) 2531{ 2532 struct proc *p; 2533 struct sbuf sb; 2534 int error, error2, *name; 2535 2536 name = (int *)arg1; 2537 sbuf_new_for_sysctl(&sb, NULL, sizeof(struct kinfo_vmentry), req); 2538 sbuf_clear_flags(&sb, SBUF_INCLUDENUL); 2539 error = pget((pid_t)name[0], PGET_CANDEBUG | PGET_NOTWEXIT, &p); 2540 if (error != 0) { 2541 sbuf_delete(&sb); 2542 return (error); 2543 } 2544 error = kern_proc_vmmap_out(p, &sb, -1, KERN_VMMAP_PACK_KINFO); 2545 error2 = sbuf_finish(&sb); 2546 sbuf_delete(&sb); 2547 return (error != 0 ? error : error2); 2548} 2549 2550#if defined(STACK) || defined(DDB) 2551static int 2552sysctl_kern_proc_kstack(SYSCTL_HANDLER_ARGS) 2553{ 2554 struct kinfo_kstack *kkstp; 2555 int error, i, *name, numthreads; 2556 lwpid_t *lwpidarray; 2557 struct thread *td; 2558 struct stack *st; 2559 struct sbuf sb; 2560 struct proc *p; 2561 2562 name = (int *)arg1; 2563 error = pget((pid_t)name[0], PGET_NOTINEXEC | PGET_WANTREAD, &p); 2564 if (error != 0) 2565 return (error); 2566 2567 kkstp = malloc(sizeof(*kkstp), M_TEMP, M_WAITOK); 2568 st = stack_create(); 2569 2570 lwpidarray = NULL; 2571 PROC_LOCK(p); 2572 do { 2573 if (lwpidarray != NULL) { 2574 free(lwpidarray, M_TEMP); 2575 lwpidarray = NULL; 2576 } 2577 numthreads = p->p_numthreads; 2578 PROC_UNLOCK(p); 2579 lwpidarray = malloc(sizeof(*lwpidarray) * numthreads, M_TEMP, 2580 M_WAITOK | M_ZERO); 2581 PROC_LOCK(p); 2582 } while (numthreads < p->p_numthreads); 2583 2584 /* 2585 * XXXRW: During the below loop, execve(2) and countless other sorts 2586 * of changes could have taken place. Should we check to see if the 2587 * vmspace has been replaced, or the like, in order to prevent 2588 * giving a snapshot that spans, say, execve(2), with some threads 2589 * before and some after? Among other things, the credentials could 2590 * have changed, in which case the right to extract debug info might 2591 * no longer be assured. 2592 */ 2593 i = 0; 2594 FOREACH_THREAD_IN_PROC(p, td) { 2595 KASSERT(i < numthreads, 2596 ("sysctl_kern_proc_kstack: numthreads")); 2597 lwpidarray[i] = td->td_tid; 2598 i++; 2599 } 2600 numthreads = i; 2601 for (i = 0; i < numthreads; i++) { 2602 td = thread_find(p, lwpidarray[i]); 2603 if (td == NULL) { 2604 continue; 2605 } 2606 bzero(kkstp, sizeof(*kkstp)); 2607 (void)sbuf_new(&sb, kkstp->kkst_trace, 2608 sizeof(kkstp->kkst_trace), SBUF_FIXEDLEN); 2609 thread_lock(td); 2610 kkstp->kkst_tid = td->td_tid; 2611 if (TD_IS_SWAPPED(td)) { 2612 kkstp->kkst_state = KKST_STATE_SWAPPED; 2613 } else if (TD_IS_RUNNING(td)) { 2614 if (stack_save_td_running(st, td) == 0) 2615 kkstp->kkst_state = KKST_STATE_STACKOK; 2616 else 2617 kkstp->kkst_state = KKST_STATE_RUNNING; 2618 } else { 2619 kkstp->kkst_state = KKST_STATE_STACKOK; 2620 stack_save_td(st, td); 2621 } 2622 thread_unlock(td); 2623 PROC_UNLOCK(p); 2624 stack_sbuf_print(&sb, st); 2625 sbuf_finish(&sb); 2626 sbuf_delete(&sb); 2627 error = SYSCTL_OUT(req, kkstp, sizeof(*kkstp)); 2628 PROC_LOCK(p); 2629 if (error) 2630 break; 2631 } 2632 _PRELE(p); 2633 PROC_UNLOCK(p); 2634 if (lwpidarray != NULL) 2635 free(lwpidarray, M_TEMP); 2636 stack_destroy(st); 2637 free(kkstp, M_TEMP); 2638 return (error); 2639} 2640#endif 2641 2642/* 2643 * This sysctl allows a process to retrieve the full list of groups from 2644 * itself or another process. 2645 */ 2646static int 2647sysctl_kern_proc_groups(SYSCTL_HANDLER_ARGS) 2648{ 2649 pid_t *pidp = (pid_t *)arg1; 2650 unsigned int arglen = arg2; 2651 struct proc *p; 2652 struct ucred *cred; 2653 int error; 2654 2655 if (arglen != 1) 2656 return (EINVAL); 2657 if (*pidp == -1) { /* -1 means this process */ 2658 p = req->td->td_proc; 2659 PROC_LOCK(p); 2660 } else { 2661 error = pget(*pidp, PGET_CANSEE, &p); 2662 if (error != 0) 2663 return (error); 2664 } 2665 2666 cred = crhold(p->p_ucred); 2667 PROC_UNLOCK(p); 2668 2669 error = SYSCTL_OUT(req, cred->cr_groups, 2670 cred->cr_ngroups * sizeof(gid_t)); 2671 crfree(cred); 2672 return (error); 2673} 2674 2675/* 2676 * This sysctl allows a process to retrieve or/and set the resource limit for 2677 * another process. 2678 */ 2679static int 2680sysctl_kern_proc_rlimit(SYSCTL_HANDLER_ARGS) 2681{ 2682 int *name = (int *)arg1; 2683 u_int namelen = arg2; 2684 struct rlimit rlim; 2685 struct proc *p; 2686 u_int which; 2687 int flags, error; 2688 2689 if (namelen != 2) 2690 return (EINVAL); 2691 2692 which = (u_int)name[1]; 2693 if (which >= RLIM_NLIMITS) 2694 return (EINVAL); 2695 2696 if (req->newptr != NULL && req->newlen != sizeof(rlim)) 2697 return (EINVAL); 2698 2699 flags = PGET_HOLD | PGET_NOTWEXIT; 2700 if (req->newptr != NULL) 2701 flags |= PGET_CANDEBUG; 2702 else 2703 flags |= PGET_CANSEE; 2704 error = pget((pid_t)name[0], flags, &p); 2705 if (error != 0) 2706 return (error); 2707 2708 /* 2709 * Retrieve limit. 2710 */ 2711 if (req->oldptr != NULL) { 2712 PROC_LOCK(p); 2713 lim_rlimit_proc(p, which, &rlim); 2714 PROC_UNLOCK(p); 2715 } 2716 error = SYSCTL_OUT(req, &rlim, sizeof(rlim)); 2717 if (error != 0) 2718 goto errout; 2719 2720 /* 2721 * Set limit. 2722 */ 2723 if (req->newptr != NULL) { 2724 error = SYSCTL_IN(req, &rlim, sizeof(rlim)); 2725 if (error == 0) 2726 error = kern_proc_setrlimit(curthread, p, which, &rlim); 2727 } 2728 2729errout: 2730 PRELE(p); 2731 return (error); 2732} 2733 2734/* 2735 * This sysctl allows a process to retrieve ps_strings structure location of 2736 * another process. 2737 */ 2738static int 2739sysctl_kern_proc_ps_strings(SYSCTL_HANDLER_ARGS) 2740{ 2741 int *name = (int *)arg1; 2742 u_int namelen = arg2; 2743 struct proc *p; 2744 vm_offset_t ps_strings; 2745 int error; 2746#ifdef COMPAT_FREEBSD32 2747 uint32_t ps_strings32; 2748#endif 2749 2750 if (namelen != 1) 2751 return (EINVAL); 2752 2753 error = pget((pid_t)name[0], PGET_CANDEBUG, &p); 2754 if (error != 0) 2755 return (error); 2756#ifdef COMPAT_FREEBSD32 2757 if ((req->flags & SCTL_MASK32) != 0) { 2758 /* 2759 * We return 0 if the 32 bit emulation request is for a 64 bit 2760 * process. 2761 */ 2762 ps_strings32 = SV_PROC_FLAG(p, SV_ILP32) != 0 ? 2763 PTROUT(p->p_sysent->sv_psstrings) : 0; 2764 PROC_UNLOCK(p); 2765 error = SYSCTL_OUT(req, &ps_strings32, sizeof(ps_strings32)); 2766 return (error); 2767 } 2768#endif 2769 ps_strings = p->p_sysent->sv_psstrings; 2770 PROC_UNLOCK(p); 2771 error = SYSCTL_OUT(req, &ps_strings, sizeof(ps_strings)); 2772 return (error); 2773} 2774 2775/* 2776 * This sysctl allows a process to retrieve umask of another process. 2777 */ 2778static int 2779sysctl_kern_proc_umask(SYSCTL_HANDLER_ARGS) 2780{ 2781 int *name = (int *)arg1; 2782 u_int namelen = arg2; 2783 struct proc *p; 2784 int error; 2785 u_short fd_cmask; 2786 2787 if (namelen != 1) 2788 return (EINVAL); 2789 2790 error = pget((pid_t)name[0], PGET_WANTREAD, &p); 2791 if (error != 0) 2792 return (error); 2793 2794 FILEDESC_SLOCK(p->p_fd); 2795 fd_cmask = p->p_fd->fd_cmask; 2796 FILEDESC_SUNLOCK(p->p_fd); 2797 PRELE(p); 2798 error = SYSCTL_OUT(req, &fd_cmask, sizeof(fd_cmask)); 2799 return (error); 2800} 2801 2802/* 2803 * This sysctl allows a process to set and retrieve binary osreldate of 2804 * another process. 2805 */ 2806static int 2807sysctl_kern_proc_osrel(SYSCTL_HANDLER_ARGS) 2808{ 2809 int *name = (int *)arg1; 2810 u_int namelen = arg2; 2811 struct proc *p; 2812 int flags, error, osrel; 2813 2814 if (namelen != 1) 2815 return (EINVAL); 2816 2817 if (req->newptr != NULL && req->newlen != sizeof(osrel)) 2818 return (EINVAL); 2819 2820 flags = PGET_HOLD | PGET_NOTWEXIT; 2821 if (req->newptr != NULL) 2822 flags |= PGET_CANDEBUG; 2823 else 2824 flags |= PGET_CANSEE; 2825 error = pget((pid_t)name[0], flags, &p); 2826 if (error != 0) 2827 return (error); 2828 2829 error = SYSCTL_OUT(req, &p->p_osrel, sizeof(p->p_osrel)); 2830 if (error != 0) 2831 goto errout; 2832 2833 if (req->newptr != NULL) { 2834 error = SYSCTL_IN(req, &osrel, sizeof(osrel)); 2835 if (error != 0) 2836 goto errout; 2837 if (osrel < 0) { 2838 error = EINVAL; 2839 goto errout; 2840 } 2841 p->p_osrel = osrel; 2842 } 2843errout: 2844 PRELE(p); 2845 return (error); 2846} 2847 2848static int 2849sysctl_kern_proc_sigtramp(SYSCTL_HANDLER_ARGS) 2850{ 2851 int *name = (int *)arg1; 2852 u_int namelen = arg2; 2853 struct proc *p; 2854 struct kinfo_sigtramp kst; 2855 const struct sysentvec *sv; 2856 int error; 2857#ifdef COMPAT_FREEBSD32 2858 struct kinfo_sigtramp32 kst32; 2859#endif 2860 2861 if (namelen != 1) 2862 return (EINVAL); 2863 2864 error = pget((pid_t)name[0], PGET_CANDEBUG, &p); 2865 if (error != 0) 2866 return (error); 2867 sv = p->p_sysent; 2868#ifdef COMPAT_FREEBSD32 2869 if ((req->flags & SCTL_MASK32) != 0) { 2870 bzero(&kst32, sizeof(kst32)); 2871 if (SV_PROC_FLAG(p, SV_ILP32)) { 2872 if (sv->sv_sigcode_base != 0) { 2873 kst32.ksigtramp_start = sv->sv_sigcode_base; 2874 kst32.ksigtramp_end = sv->sv_sigcode_base + 2875 *sv->sv_szsigcode; 2876 } else { 2877 kst32.ksigtramp_start = sv->sv_psstrings - 2878 *sv->sv_szsigcode; 2879 kst32.ksigtramp_end = sv->sv_psstrings; 2880 } 2881 } 2882 PROC_UNLOCK(p); 2883 error = SYSCTL_OUT(req, &kst32, sizeof(kst32)); 2884 return (error); 2885 } 2886#endif 2887 bzero(&kst, sizeof(kst)); 2888 if (sv->sv_sigcode_base != 0) { 2889 kst.ksigtramp_start = (char *)sv->sv_sigcode_base; 2890 kst.ksigtramp_end = (char *)sv->sv_sigcode_base + 2891 *sv->sv_szsigcode; 2892 } else { 2893 kst.ksigtramp_start = (char *)sv->sv_psstrings - 2894 *sv->sv_szsigcode; 2895 kst.ksigtramp_end = (char *)sv->sv_psstrings; 2896 } 2897 PROC_UNLOCK(p); 2898 error = SYSCTL_OUT(req, &kst, sizeof(kst)); 2899 return (error); 2900} 2901 2902SYSCTL_NODE(_kern, KERN_PROC, proc, CTLFLAG_RD, 0, "Process table"); 2903 2904SYSCTL_PROC(_kern_proc, KERN_PROC_ALL, all, CTLFLAG_RD|CTLTYPE_STRUCT| 2905 CTLFLAG_MPSAFE, 0, 0, sysctl_kern_proc, "S,proc", 2906 "Return entire process table"); 2907 2908static SYSCTL_NODE(_kern_proc, KERN_PROC_GID, gid, CTLFLAG_RD | CTLFLAG_MPSAFE, 2909 sysctl_kern_proc, "Process table"); 2910 2911static SYSCTL_NODE(_kern_proc, KERN_PROC_PGRP, pgrp, CTLFLAG_RD | CTLFLAG_MPSAFE, 2912 sysctl_kern_proc, "Process table"); 2913 2914static SYSCTL_NODE(_kern_proc, KERN_PROC_RGID, rgid, CTLFLAG_RD | CTLFLAG_MPSAFE, 2915 sysctl_kern_proc, "Process table"); 2916 2917static SYSCTL_NODE(_kern_proc, KERN_PROC_SESSION, sid, CTLFLAG_RD | 2918 CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2919 2920static SYSCTL_NODE(_kern_proc, KERN_PROC_TTY, tty, CTLFLAG_RD | CTLFLAG_MPSAFE, 2921 sysctl_kern_proc, "Process table"); 2922 2923static SYSCTL_NODE(_kern_proc, KERN_PROC_UID, uid, CTLFLAG_RD | CTLFLAG_MPSAFE, 2924 sysctl_kern_proc, "Process table"); 2925 2926static SYSCTL_NODE(_kern_proc, KERN_PROC_RUID, ruid, CTLFLAG_RD | CTLFLAG_MPSAFE, 2927 sysctl_kern_proc, "Process table"); 2928 2929static SYSCTL_NODE(_kern_proc, KERN_PROC_PID, pid, CTLFLAG_RD | CTLFLAG_MPSAFE, 2930 sysctl_kern_proc, "Process table"); 2931 2932static SYSCTL_NODE(_kern_proc, KERN_PROC_PROC, proc, CTLFLAG_RD | CTLFLAG_MPSAFE, 2933 sysctl_kern_proc, "Return process table, no threads"); 2934 2935static SYSCTL_NODE(_kern_proc, KERN_PROC_ARGS, args, 2936 CTLFLAG_RW | CTLFLAG_CAPWR | CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, 2937 sysctl_kern_proc_args, "Process argument list"); 2938 2939static SYSCTL_NODE(_kern_proc, KERN_PROC_ENV, env, CTLFLAG_RD | CTLFLAG_MPSAFE, 2940 sysctl_kern_proc_env, "Process environment"); 2941 2942static SYSCTL_NODE(_kern_proc, KERN_PROC_AUXV, auxv, CTLFLAG_RD | 2943 CTLFLAG_MPSAFE, sysctl_kern_proc_auxv, "Process ELF auxiliary vector"); 2944 2945static SYSCTL_NODE(_kern_proc, KERN_PROC_PATHNAME, pathname, CTLFLAG_RD | 2946 CTLFLAG_MPSAFE, sysctl_kern_proc_pathname, "Process executable path"); 2947 2948static SYSCTL_NODE(_kern_proc, KERN_PROC_SV_NAME, sv_name, CTLFLAG_RD | 2949 CTLFLAG_MPSAFE, sysctl_kern_proc_sv_name, 2950 "Process syscall vector name (ABI type)"); 2951 2952static SYSCTL_NODE(_kern_proc, (KERN_PROC_GID | KERN_PROC_INC_THREAD), gid_td, 2953 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2954 2955static SYSCTL_NODE(_kern_proc, (KERN_PROC_PGRP | KERN_PROC_INC_THREAD), pgrp_td, 2956 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2957 2958static SYSCTL_NODE(_kern_proc, (KERN_PROC_RGID | KERN_PROC_INC_THREAD), rgid_td, 2959 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2960 2961static SYSCTL_NODE(_kern_proc, (KERN_PROC_SESSION | KERN_PROC_INC_THREAD), 2962 sid_td, CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2963 2964static SYSCTL_NODE(_kern_proc, (KERN_PROC_TTY | KERN_PROC_INC_THREAD), tty_td, 2965 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2966 2967static SYSCTL_NODE(_kern_proc, (KERN_PROC_UID | KERN_PROC_INC_THREAD), uid_td, 2968 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2969 2970static SYSCTL_NODE(_kern_proc, (KERN_PROC_RUID | KERN_PROC_INC_THREAD), ruid_td, 2971 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2972 2973static SYSCTL_NODE(_kern_proc, (KERN_PROC_PID | KERN_PROC_INC_THREAD), pid_td, 2974 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, "Process table"); 2975 2976static SYSCTL_NODE(_kern_proc, (KERN_PROC_PROC | KERN_PROC_INC_THREAD), proc_td, 2977 CTLFLAG_RD | CTLFLAG_MPSAFE, sysctl_kern_proc, 2978 "Return process table, no threads"); 2979 2980#ifdef COMPAT_FREEBSD7 2981static SYSCTL_NODE(_kern_proc, KERN_PROC_OVMMAP, ovmmap, CTLFLAG_RD | 2982 CTLFLAG_MPSAFE, sysctl_kern_proc_ovmmap, "Old Process vm map entries"); 2983#endif 2984 2985static SYSCTL_NODE(_kern_proc, KERN_PROC_VMMAP, vmmap, CTLFLAG_RD | 2986 CTLFLAG_MPSAFE, sysctl_kern_proc_vmmap, "Process vm map entries"); 2987 2988#if defined(STACK) || defined(DDB) 2989static SYSCTL_NODE(_kern_proc, KERN_PROC_KSTACK, kstack, CTLFLAG_RD | 2990 CTLFLAG_MPSAFE, sysctl_kern_proc_kstack, "Process kernel stacks"); 2991#endif 2992 2993static SYSCTL_NODE(_kern_proc, KERN_PROC_GROUPS, groups, CTLFLAG_RD | 2994 CTLFLAG_MPSAFE, sysctl_kern_proc_groups, "Process groups"); 2995 2996static SYSCTL_NODE(_kern_proc, KERN_PROC_RLIMIT, rlimit, CTLFLAG_RW | 2997 CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, sysctl_kern_proc_rlimit, 2998 "Process resource limits"); 2999 3000static SYSCTL_NODE(_kern_proc, KERN_PROC_PS_STRINGS, ps_strings, CTLFLAG_RD | 3001 CTLFLAG_MPSAFE, sysctl_kern_proc_ps_strings, 3002 "Process ps_strings location"); 3003 3004static SYSCTL_NODE(_kern_proc, KERN_PROC_UMASK, umask, CTLFLAG_RD | 3005 CTLFLAG_MPSAFE, sysctl_kern_proc_umask, "Process umask"); 3006 3007static SYSCTL_NODE(_kern_proc, KERN_PROC_OSREL, osrel, CTLFLAG_RW | 3008 CTLFLAG_ANYBODY | CTLFLAG_MPSAFE, sysctl_kern_proc_osrel, 3009 "Process binary osreldate"); 3010 3011static SYSCTL_NODE(_kern_proc, KERN_PROC_SIGTRAMP, sigtramp, CTLFLAG_RD | 3012 CTLFLAG_MPSAFE, sysctl_kern_proc_sigtramp, 3013 "Process signal trampoline location"); 3014 3015int allproc_gen; 3016 3017/* 3018 * stop_all_proc() purpose is to stop all process which have usermode, 3019 * except current process for obvious reasons. This makes it somewhat 3020 * unreliable when invoked from multithreaded process. The service 3021 * must not be user-callable anyway. 3022 */ 3023void 3024stop_all_proc(void) 3025{ 3026 struct proc *cp, *p; 3027 int r, gen; 3028 bool restart, seen_stopped, seen_exiting, stopped_some; 3029 3030 cp = curproc; 3031allproc_loop: 3032 sx_xlock(&allproc_lock); 3033 gen = allproc_gen; 3034 seen_exiting = seen_stopped = stopped_some = restart = false; 3035 LIST_REMOVE(cp, p_list); 3036 LIST_INSERT_HEAD(&allproc, cp, p_list); 3037 for (;;) { 3038 p = LIST_NEXT(cp, p_list); 3039 if (p == NULL) 3040 break; 3041 LIST_REMOVE(cp, p_list); 3042 LIST_INSERT_AFTER(p, cp, p_list); 3043 PROC_LOCK(p); 3044 if ((p->p_flag & (P_KPROC | P_SYSTEM | P_TOTAL_STOP)) != 0) { 3045 PROC_UNLOCK(p); 3046 continue; 3047 } 3048 if ((p->p_flag & P_WEXIT) != 0) { 3049 seen_exiting = true; 3050 PROC_UNLOCK(p); 3051 continue; 3052 } 3053 if (P_SHOULDSTOP(p) == P_STOPPED_SINGLE) { 3054 /* 3055 * Stopped processes are tolerated when there 3056 * are no other processes which might continue 3057 * them. P_STOPPED_SINGLE but not 3058 * P_TOTAL_STOP process still has at least one 3059 * thread running. 3060 */ 3061 seen_stopped = true; 3062 PROC_UNLOCK(p); 3063 continue; 3064 } 3065 _PHOLD(p); 3066 sx_xunlock(&allproc_lock); 3067 r = thread_single(p, SINGLE_ALLPROC); 3068 if (r != 0) 3069 restart = true; 3070 else 3071 stopped_some = true; 3072 _PRELE(p); 3073 PROC_UNLOCK(p); 3074 sx_xlock(&allproc_lock); 3075 } 3076 /* Catch forked children we did not see in iteration. */ 3077 if (gen != allproc_gen) 3078 restart = true; 3079 sx_xunlock(&allproc_lock); 3080 if (restart || stopped_some || seen_exiting || seen_stopped) { 3081 kern_yield(PRI_USER); 3082 goto allproc_loop; 3083 } 3084} 3085 3086void 3087resume_all_proc(void) 3088{ 3089 struct proc *cp, *p; 3090 3091 cp = curproc; 3092 sx_xlock(&allproc_lock); 3093again: 3094 LIST_REMOVE(cp, p_list); 3095 LIST_INSERT_HEAD(&allproc, cp, p_list); 3096 for (;;) { 3097 p = LIST_NEXT(cp, p_list); 3098 if (p == NULL) 3099 break; 3100 LIST_REMOVE(cp, p_list); 3101 LIST_INSERT_AFTER(p, cp, p_list); 3102 PROC_LOCK(p); 3103 if ((p->p_flag & P_TOTAL_STOP) != 0) { 3104 sx_xunlock(&allproc_lock); 3105 _PHOLD(p); 3106 thread_single_end(p, SINGLE_ALLPROC); 3107 _PRELE(p); 3108 PROC_UNLOCK(p); 3109 sx_xlock(&allproc_lock); 3110 } else { 3111 PROC_UNLOCK(p); 3112 } 3113 } 3114 /* Did the loop above missed any stopped process ? */ 3115 LIST_FOREACH(p, &allproc, p_list) { 3116 /* No need for proc lock. */ 3117 if ((p->p_flag & P_TOTAL_STOP) != 0) 3118 goto again; 3119 } 3120 sx_xunlock(&allproc_lock); 3121} 3122 3123/* #define TOTAL_STOP_DEBUG 1 */ 3124#ifdef TOTAL_STOP_DEBUG 3125volatile static int ap_resume; 3126#include <sys/mount.h> 3127 3128static int 3129sysctl_debug_stop_all_proc(SYSCTL_HANDLER_ARGS) 3130{ 3131 int error, val; 3132 3133 val = 0; 3134 ap_resume = 0; 3135 error = sysctl_handle_int(oidp, &val, 0, req); 3136 if (error != 0 || req->newptr == NULL) 3137 return (error); 3138 if (val != 0) { 3139 stop_all_proc(); 3140 syncer_suspend(); 3141 while (ap_resume == 0) 3142 ; 3143 syncer_resume(); 3144 resume_all_proc(); 3145 } 3146 return (0); 3147} 3148 3149SYSCTL_PROC(_debug, OID_AUTO, stop_all_proc, CTLTYPE_INT | CTLFLAG_RW | 3150 CTLFLAG_MPSAFE, __DEVOLATILE(int *, &ap_resume), 0, 3151 sysctl_debug_stop_all_proc, "I", 3152 ""); 3153#endif 3154