sys_ptrace_common.c revision 1.58.2.7
1 /* $NetBSD: sys_ptrace_common.c,v 1.58.2.7 2019/10/15 19:07:14 martin Exp $ */ 2 3 /*- 4 * Copyright (c) 2008, 2009 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Andrew Doran. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1982, 1986, 1989, 1993 34 * The Regents of the University of California. All rights reserved. 35 * (c) UNIX System Laboratories, Inc. 36 * All or some portions of this file are derived from material licensed 37 * to the University of California by American Telephone and Telegraph 38 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 39 * the permission of UNIX System Laboratories, Inc. 40 * 41 * This code is derived from software contributed to Berkeley by 42 * Jan-Simon Pendry. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 * 68 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 69 */ 70 71 /*- 72 * Copyright (c) 1993 Jan-Simon Pendry. 73 * Copyright (c) 1994 Christopher G. Demetriou. All rights reserved. 74 * 75 * This code is derived from software contributed to Berkeley by 76 * Jan-Simon Pendry. 77 * 78 * Redistribution and use in source and binary forms, with or without 79 * modification, are permitted provided that the following conditions 80 * are met: 81 * 1. Redistributions of source code must retain the above copyright 82 * notice, this list of conditions and the following disclaimer. 83 * 2. Redistributions in binary form must reproduce the above copyright 84 * notice, this list of conditions and the following disclaimer in the 85 * documentation and/or other materials provided with the distribution. 86 * 3. All advertising materials mentioning features or use of this software 87 * must display the following acknowledgement: 88 * This product includes software developed by the University of 89 * California, Berkeley and its contributors. 90 * 4. Neither the name of the University nor the names of its contributors 91 * may be used to endorse or promote products derived from this software 92 * without specific prior written permission. 93 * 94 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 95 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 96 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 97 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 98 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 99 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 100 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 101 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 102 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 103 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 104 * SUCH DAMAGE. 105 * 106 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 107 */ 108 109 /* 110 * References: 111 * (1) Bach's "The Design of the UNIX Operating System", 112 * (2) sys/miscfs/procfs from UCB's 4.4BSD-Lite distribution, 113 * (3) the "4.4BSD Programmer's Reference Manual" published 114 * by USENIX and O'Reilly & Associates. 115 * The 4.4BSD PRM does a reasonably good job of documenting what the various 116 * ptrace() requests should actually do, and its text is quoted several times 117 * in this file. 118 */ 119 120 #include <sys/cdefs.h> 121 __KERNEL_RCSID(0, "$NetBSD: sys_ptrace_common.c,v 1.58.2.7 2019/10/15 19:07:14 martin Exp $"); 122 123 #ifdef _KERNEL_OPT 124 #include "opt_ptrace.h" 125 #include "opt_ktrace.h" 126 #include "opt_pax.h" 127 #include "opt_compat_netbsd32.h" 128 #endif 129 130 #if defined(__HAVE_COMPAT_NETBSD32) && !defined(COMPAT_NETBSD32) \ 131 && !defined(_RUMPKERNEL) 132 #define COMPAT_NETBSD32 133 #endif 134 135 #include <sys/param.h> 136 #include <sys/systm.h> 137 #include <sys/proc.h> 138 #include <sys/errno.h> 139 #include <sys/exec.h> 140 #include <sys/pax.h> 141 #include <sys/ptrace.h> 142 #include <sys/uio.h> 143 #include <sys/ras.h> 144 #include <sys/kmem.h> 145 #include <sys/kauth.h> 146 #include <sys/mount.h> 147 #include <sys/syscallargs.h> 148 #include <sys/module.h> 149 #include <sys/condvar.h> 150 #include <sys/mutex.h> 151 152 #include <uvm/uvm_extern.h> 153 154 #include <machine/reg.h> 155 156 #ifdef PTRACE 157 # ifdef PTRACE_DEBUG 158 # define DPRINTF(a) uprintf a 159 # else 160 # define DPRINTF(a) 161 # endif 162 163 static kauth_listener_t ptrace_listener; 164 static int process_auxv_offset(struct proc *, struct uio *); 165 166 extern int user_va0_disable; 167 168 #if 0 169 static int ptrace_cbref; 170 static kmutex_t ptrace_mtx; 171 static kcondvar_t ptrace_cv; 172 #endif 173 174 #ifdef PT_GETREGS 175 # define case_PT_GETREGS case PT_GETREGS: 176 #else 177 # define case_PT_GETREGS 178 #endif 179 180 #ifdef PT_SETREGS 181 # define case_PT_SETREGS case PT_SETREGS: 182 #else 183 # define case_PT_SETREGS 184 #endif 185 186 #ifdef PT_GETFPREGS 187 # define case_PT_GETFPREGS case PT_GETFPREGS: 188 #else 189 # define case_PT_GETFPREGS 190 #endif 191 192 #ifdef PT_SETFPREGS 193 # define case_PT_SETFPREGS case PT_SETFPREGS: 194 #else 195 # define case_PT_SETFPREGS 196 #endif 197 198 #ifdef PT_GETDBREGS 199 # define case_PT_GETDBREGS case PT_GETDBREGS: 200 #else 201 # define case_PT_GETDBREGS 202 #endif 203 204 #ifdef PT_SETDBREGS 205 # define case_PT_SETDBREGS case PT_SETDBREGS: 206 #else 207 # define case_PT_SETDBREGS 208 #endif 209 210 #if defined(PT_SETREGS) || defined(PT_GETREGS) || \ 211 defined(PT_SETFPREGS) || defined(PT_GETFPREGS) || \ 212 defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 213 # define PT_REGISTERS 214 #endif 215 216 static int 217 ptrace_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 218 void *arg0, void *arg1, void *arg2, void *arg3) 219 { 220 struct proc *p; 221 int result; 222 #ifdef PT_SETDBREGS 223 extern int user_set_dbregs; 224 #endif 225 226 result = KAUTH_RESULT_DEFER; 227 p = arg0; 228 229 #if 0 230 mutex_enter(&ptrace_mtx); 231 ptrace_cbref++; 232 mutex_exit(&ptrace_mtx); 233 #endif 234 if (action != KAUTH_PROCESS_PTRACE) 235 goto out; 236 237 switch ((u_long)arg1) { 238 #ifdef PT_SETDBREGS 239 case_PT_SETDBREGS 240 if (kauth_cred_getuid(cred) != 0 && user_set_dbregs == 0) { 241 result = KAUTH_RESULT_DENY; 242 break; 243 } 244 #endif 245 /* FALLTHROUGH */ 246 case PT_TRACE_ME: 247 case PT_ATTACH: 248 case PT_WRITE_I: 249 case PT_WRITE_D: 250 case PT_READ_I: 251 case PT_READ_D: 252 case PT_IO: 253 case_PT_GETREGS 254 case_PT_SETREGS 255 case_PT_GETFPREGS 256 case_PT_SETFPREGS 257 case_PT_GETDBREGS 258 case PT_SET_EVENT_MASK: 259 case PT_GET_EVENT_MASK: 260 case PT_GET_PROCESS_STATE: 261 case PT_SET_SIGINFO: 262 case PT_GET_SIGINFO: 263 #ifdef __HAVE_PTRACE_MACHDEP 264 PTRACE_MACHDEP_REQUEST_CASES 265 #endif 266 if (kauth_cred_getuid(cred) != kauth_cred_getuid(p->p_cred) || 267 ISSET(p->p_flag, PK_SUGID)) { 268 break; 269 } 270 271 result = KAUTH_RESULT_ALLOW; 272 273 break; 274 275 #ifdef PT_STEP 276 case PT_STEP: 277 case PT_SETSTEP: 278 case PT_CLEARSTEP: 279 #endif 280 case PT_CONTINUE: 281 case PT_KILL: 282 case PT_DETACH: 283 case PT_LWPINFO: 284 case PT_SYSCALL: 285 case PT_SYSCALLEMU: 286 case PT_DUMPCORE: 287 case PT_RESUME: 288 case PT_SUSPEND: 289 result = KAUTH_RESULT_ALLOW; 290 break; 291 292 default: 293 break; 294 } 295 296 out: 297 #if 0 298 mutex_enter(&ptrace_mtx); 299 if (--ptrace_cbref == 0) 300 cv_broadcast(&ptrace_cv); 301 mutex_exit(&ptrace_mtx); 302 #endif 303 304 return result; 305 } 306 307 int 308 ptrace_init(void) 309 { 310 311 #if 0 312 mutex_init(&ptrace_mtx, MUTEX_DEFAULT, IPL_NONE); 313 cv_init(&ptrace_cv, "ptracecb"); 314 ptrace_cbref = 0; 315 #endif 316 ptrace_listener = kauth_listen_scope(KAUTH_SCOPE_PROCESS, 317 ptrace_listener_cb, NULL); 318 return 0; 319 } 320 321 int 322 ptrace_fini(void) 323 { 324 325 kauth_unlisten_scope(ptrace_listener); 326 327 #if 0 328 /* Make sure no-one is executing our kauth listener */ 329 330 mutex_enter(&ptrace_mtx); 331 while (ptrace_cbref != 0) 332 cv_wait(&ptrace_cv, &ptrace_mtx); 333 mutex_exit(&ptrace_mtx); 334 mutex_destroy(&ptrace_mtx); 335 cv_destroy(&ptrace_cv); 336 #endif 337 338 return 0; 339 } 340 341 static struct proc * 342 ptrace_find(struct lwp *l, int req, pid_t pid) 343 { 344 struct proc *t; 345 346 /* "A foolish consistency..." XXX */ 347 if (req == PT_TRACE_ME) { 348 t = l->l_proc; 349 mutex_enter(t->p_lock); 350 return t; 351 } 352 353 /* Find the process we're supposed to be operating on. */ 354 t = proc_find(pid); 355 if (t == NULL) 356 return NULL; 357 358 /* XXX-elad */ 359 mutex_enter(t->p_lock); 360 int error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, 361 t, KAUTH_ARG(KAUTH_REQ_PROCESS_CANSEE_ENTRY), NULL, NULL); 362 if (error) { 363 mutex_exit(t->p_lock); 364 return NULL; 365 } 366 return t; 367 } 368 369 static int 370 ptrace_allowed(struct lwp *l, int req, struct proc *t, struct proc *p, 371 bool *locked) 372 { 373 *locked = false; 374 375 /* 376 * Grab a reference on the process to prevent it from execing or 377 * exiting. 378 */ 379 if (!rw_tryenter(&t->p_reflock, RW_READER)) 380 return EBUSY; 381 382 *locked = true; 383 384 /* Make sure we can operate on it. */ 385 switch (req) { 386 case PT_TRACE_ME: 387 /* 388 * You can't say to the parent of a process to start tracing if: 389 * (1) the parent is initproc, 390 */ 391 if (p->p_pptr == initproc) 392 return EPERM; 393 394 /* 395 * (2) the process is initproc, or 396 */ 397 if (p == initproc) 398 return EPERM; 399 400 /* 401 * (3) the child is already traced. 402 */ 403 if (ISSET(p->p_slflag, PSL_TRACED)) 404 return EBUSY; 405 406 return 0; 407 408 case PT_ATTACH: 409 /* 410 * You can't attach to a process if: 411 * (1) it's the process that's doing the attaching, 412 */ 413 if (t == p) 414 return EINVAL; 415 416 /* 417 * (2) it's a system process, 418 */ 419 if (t->p_flag & PK_SYSTEM) 420 return EPERM; 421 422 /* 423 * (3) the tracer is initproc, 424 */ 425 if (p == initproc) 426 return EPERM; 427 428 /* 429 * (4) it's already being traced, 430 */ 431 if (ISSET(t->p_slflag, PSL_TRACED)) 432 return EBUSY; 433 434 /* 435 * (5) it's a vfork(2)ed parent of the current process, or 436 */ 437 if (ISSET(p->p_lflag, PL_PPWAIT) && p->p_pptr == t) 438 return EPERM; 439 440 /* 441 * (6) the tracer is chrooted, and its root directory is 442 * not at or above the root directory of the tracee 443 */ 444 mutex_exit(t->p_lock); /* XXXSMP */ 445 int tmp = proc_isunder(t, l); 446 mutex_enter(t->p_lock); /* XXXSMP */ 447 if (!tmp) 448 return EPERM; 449 return 0; 450 451 case PT_READ_I: 452 case PT_READ_D: 453 case PT_WRITE_I: 454 case PT_WRITE_D: 455 case PT_IO: 456 case PT_SET_SIGINFO: 457 case PT_GET_SIGINFO: 458 case_PT_GETREGS 459 case_PT_SETREGS 460 case_PT_GETFPREGS 461 case_PT_SETFPREGS 462 case_PT_GETDBREGS 463 case_PT_SETDBREGS 464 #ifdef __HAVE_PTRACE_MACHDEP 465 PTRACE_MACHDEP_REQUEST_CASES 466 #endif 467 /* 468 * You can't read/write the memory or registers of a process 469 * if the tracer is chrooted, and its root directory is not at 470 * or above the root directory of the tracee. 471 */ 472 mutex_exit(t->p_lock); /* XXXSMP */ 473 tmp = proc_isunder(t, l); 474 mutex_enter(t->p_lock); /* XXXSMP */ 475 if (!tmp) 476 return EPERM; 477 /*FALLTHROUGH*/ 478 479 case PT_CONTINUE: 480 case PT_KILL: 481 case PT_DETACH: 482 case PT_LWPINFO: 483 case PT_SYSCALL: 484 case PT_SYSCALLEMU: 485 case PT_DUMPCORE: 486 #ifdef PT_STEP 487 case PT_STEP: 488 case PT_SETSTEP: 489 case PT_CLEARSTEP: 490 #endif 491 case PT_SET_EVENT_MASK: 492 case PT_GET_EVENT_MASK: 493 case PT_GET_PROCESS_STATE: 494 case PT_RESUME: 495 case PT_SUSPEND: 496 /* 497 * You can't do what you want to the process if: 498 * (1) It's not being traced at all, 499 */ 500 if (!ISSET(t->p_slflag, PSL_TRACED)) 501 return EPERM; 502 503 /* 504 * (2) it's not being traced by _you_, or 505 */ 506 if (t->p_pptr != p) { 507 DPRINTF(("parent %d != %d\n", t->p_pptr->p_pid, 508 p->p_pid)); 509 return EBUSY; 510 } 511 512 /* 513 * (3) it's not currently stopped. 514 */ 515 if (t->p_stat != SSTOP || !t->p_waited /* XXXSMP */) { 516 DPRINTF(("stat %d flag %d\n", t->p_stat, 517 !t->p_waited)); 518 return EBUSY; 519 } 520 return 0; 521 522 default: /* It was not a legal request. */ 523 return EINVAL; 524 } 525 } 526 527 static int 528 ptrace_needs_hold(int req) 529 { 530 switch (req) { 531 #ifdef PT_STEP 532 case PT_STEP: 533 #endif 534 case PT_CONTINUE: 535 case PT_DETACH: 536 case PT_KILL: 537 case PT_SYSCALL: 538 case PT_SYSCALLEMU: 539 case PT_ATTACH: 540 case PT_TRACE_ME: 541 case PT_GET_SIGINFO: 542 case PT_SET_SIGINFO: 543 return 1; 544 default: 545 return 0; 546 } 547 } 548 549 static int 550 ptrace_update_lwp(struct proc *t, struct lwp **lt, lwpid_t lid) 551 { 552 if (lid == 0 || lid == (*lt)->l_lid || t->p_nlwps == 1) 553 return 0; 554 555 mutex_enter(t->p_lock); 556 lwp_delref2(*lt); 557 558 *lt = lwp_find(t, lid); 559 if (*lt == NULL) { 560 mutex_exit(t->p_lock); 561 return ESRCH; 562 } 563 564 if ((*lt)->l_flag & LW_SYSTEM) { 565 mutex_exit(t->p_lock); 566 *lt = NULL; 567 return EINVAL; 568 } 569 570 lwp_addref(*lt); 571 mutex_exit(t->p_lock); 572 573 return 0; 574 } 575 576 static int 577 ptrace_get_siginfo(struct proc *t, struct ptrace_methods *ptm, void *addr, 578 size_t data) 579 { 580 struct ptrace_siginfo psi; 581 582 memset(&psi, 0, sizeof(psi)); 583 psi.psi_siginfo._info = t->p_sigctx.ps_info; 584 psi.psi_lwpid = t->p_sigctx.ps_lwp; 585 DPRINTF(("%s: lwp=%d signal=%d\n", __func__, psi.psi_lwpid, 586 psi.psi_siginfo.si_signo)); 587 588 return ptm->ptm_copyout_siginfo(&psi, addr, data); 589 } 590 591 static int 592 ptrace_set_siginfo(struct proc *t, struct lwp **lt, struct ptrace_methods *ptm, 593 void *addr, size_t data) 594 { 595 struct ptrace_siginfo psi; 596 597 int error = ptm->ptm_copyin_siginfo(&psi, addr, data); 598 if (error) 599 return error; 600 601 /* Check that the data is a valid signal number or zero. */ 602 if (psi.psi_siginfo.si_signo < 0 || psi.psi_siginfo.si_signo >= NSIG) 603 return EINVAL; 604 605 t->p_sigctx.ps_faked = true; 606 t->p_sigctx.ps_info = psi.psi_siginfo._info; 607 t->p_sigctx.ps_lwp = psi.psi_lwpid; 608 DPRINTF(("%s: lwp=%d signal=%d\n", __func__, psi.psi_lwpid, 609 psi.psi_siginfo.si_signo)); 610 return 0; 611 } 612 613 static int 614 ptrace_get_event_mask(struct proc *t, void *addr, size_t data) 615 { 616 struct ptrace_event pe; 617 618 if (data != sizeof(pe)) { 619 DPRINTF(("%s: %zu != %zu\n", __func__, data, sizeof(pe))); 620 return EINVAL; 621 } 622 memset(&pe, 0, sizeof(pe)); 623 pe.pe_set_event = ISSET(t->p_slflag, PSL_TRACEFORK) ? 624 PTRACE_FORK : 0; 625 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACEVFORK) ? 626 PTRACE_VFORK : 0; 627 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACEVFORK_DONE) ? 628 PTRACE_VFORK_DONE : 0; 629 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACELWP_CREATE) ? 630 PTRACE_LWP_CREATE : 0; 631 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACELWP_EXIT) ? 632 PTRACE_LWP_EXIT : 0; 633 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACEPOSIX_SPAWN) ? 634 PTRACE_POSIX_SPAWN : 0; 635 DPRINTF(("%s: lwp=%d event=%#x\n", __func__, 636 t->p_sigctx.ps_lwp, pe.pe_set_event)); 637 return copyout(&pe, addr, sizeof(pe)); 638 } 639 640 static int 641 ptrace_set_event_mask(struct proc *t, void *addr, size_t data) 642 { 643 struct ptrace_event pe; 644 int error; 645 646 if (data != sizeof(pe)) { 647 DPRINTF(("%s: %zu != %zu\n", __func__, data, sizeof(pe))); 648 return EINVAL; 649 } 650 if ((error = copyin(addr, &pe, sizeof(pe))) != 0) 651 return error; 652 653 DPRINTF(("%s: lwp=%d event=%#x\n", __func__, 654 t->p_sigctx.ps_lwp, pe.pe_set_event)); 655 if (pe.pe_set_event & PTRACE_FORK) 656 SET(t->p_slflag, PSL_TRACEFORK); 657 else 658 CLR(t->p_slflag, PSL_TRACEFORK); 659 660 if (pe.pe_set_event & PTRACE_VFORK) 661 SET(t->p_slflag, PSL_TRACEVFORK); 662 else 663 CLR(t->p_slflag, PSL_TRACEVFORK); 664 665 if (pe.pe_set_event & PTRACE_VFORK_DONE) 666 SET(t->p_slflag, PSL_TRACEVFORK_DONE); 667 else 668 CLR(t->p_slflag, PSL_TRACEVFORK_DONE); 669 670 if (pe.pe_set_event & PTRACE_LWP_CREATE) 671 SET(t->p_slflag, PSL_TRACELWP_CREATE); 672 else 673 CLR(t->p_slflag, PSL_TRACELWP_CREATE); 674 675 if (pe.pe_set_event & PTRACE_LWP_EXIT) 676 SET(t->p_slflag, PSL_TRACELWP_EXIT); 677 else 678 CLR(t->p_slflag, PSL_TRACELWP_EXIT); 679 680 if (pe.pe_set_event & PTRACE_POSIX_SPAWN) 681 SET(t->p_slflag, PSL_TRACEPOSIX_SPAWN); 682 else 683 CLR(t->p_slflag, PSL_TRACEPOSIX_SPAWN); 684 685 return 0; 686 } 687 688 static int 689 ptrace_get_process_state(struct proc *t, void *addr, size_t data) 690 { 691 struct _ksiginfo *si; 692 struct ptrace_state ps; 693 694 if (data != sizeof(ps)) { 695 DPRINTF(("%s: %zu != %zu\n", __func__, data, sizeof(ps))); 696 return EINVAL; 697 } 698 699 if (t->p_sigctx.ps_info._signo != SIGTRAP || 700 (t->p_sigctx.ps_info._code != TRAP_CHLD && 701 t->p_sigctx.ps_info._code != TRAP_LWP)) { 702 memset(&ps, 0, sizeof(ps)); 703 } else { 704 si = &t->p_sigctx.ps_info; 705 706 KASSERT(si->_reason._ptrace_state._pe_report_event > 0); 707 KASSERT(si->_reason._ptrace_state._option._pe_other_pid > 0); 708 709 ps.pe_report_event = si->_reason._ptrace_state._pe_report_event; 710 711 CTASSERT(sizeof(ps.pe_other_pid) == sizeof(ps.pe_lwp)); 712 ps.pe_other_pid = 713 si->_reason._ptrace_state._option._pe_other_pid; 714 } 715 716 DPRINTF(("%s: lwp=%d event=%#x pid=%d lwp=%d\n", __func__, 717 t->p_sigctx.ps_lwp, ps.pe_report_event, 718 ps.pe_other_pid, ps.pe_lwp)); 719 return copyout(&ps, addr, sizeof(ps)); 720 } 721 722 static int 723 ptrace_lwpinfo(struct proc *t, struct lwp **lt, void *addr, size_t data) 724 { 725 struct ptrace_lwpinfo pl; 726 727 if (data != sizeof(pl)) { 728 DPRINTF(("%s: %zu != %zu\n", __func__, data, sizeof(pl))); 729 return EINVAL; 730 } 731 int error = copyin(addr, &pl, sizeof(pl)); 732 if (error) 733 return error; 734 735 lwpid_t tmp = pl.pl_lwpid; 736 lwp_delref(*lt); 737 mutex_enter(t->p_lock); 738 if (tmp == 0) 739 *lt = lwp_find_first(t); 740 else { 741 *lt = lwp_find(t, tmp); 742 if (*lt == NULL) { 743 mutex_exit(t->p_lock); 744 return ESRCH; 745 } 746 *lt = LIST_NEXT(*lt, l_sibling); 747 } 748 749 while (*lt != NULL && !lwp_alive(*lt)) 750 *lt = LIST_NEXT(*lt, l_sibling); 751 752 pl.pl_lwpid = 0; 753 pl.pl_event = 0; 754 if (*lt) { 755 lwp_addref(*lt); 756 pl.pl_lwpid = (*lt)->l_lid; 757 758 if ((*lt)->l_flag & LW_WSUSPEND) 759 pl.pl_event = PL_EVENT_SUSPENDED; 760 /* 761 * If we match the lwp, or it was sent to every lwp, 762 * we set PL_EVENT_SIGNAL. 763 * XXX: ps_lwp == 0 means everyone and noone, so 764 * check ps_signo too. 765 */ 766 else if ((*lt)->l_lid == t->p_sigctx.ps_lwp 767 || (t->p_sigctx.ps_lwp == 0 && 768 t->p_sigctx.ps_info._signo)) { 769 DPRINTF(("%s: lwp=%d siglwp=%d signo %d\n", __func__, 770 pl.pl_lwpid, t->p_sigctx.ps_lwp, 771 t->p_sigctx.ps_info._signo)); 772 pl.pl_event = PL_EVENT_SIGNAL; 773 } 774 } 775 mutex_exit(t->p_lock); 776 DPRINTF(("%s: lwp=%d event=%#x\n", __func__, 777 pl.pl_lwpid, pl.pl_event)); 778 779 return copyout(&pl, addr, sizeof(pl)); 780 } 781 782 static int 783 ptrace_startstop(struct proc *t, struct lwp **lt, int rq, void *addr, 784 size_t data) 785 { 786 int error; 787 788 if ((error = ptrace_update_lwp(t, lt, data)) != 0) 789 return error; 790 791 DPRINTF(("%s: lwp=%d request=%d\n", __func__, (*lt)->l_lid, rq)); 792 lwp_lock(*lt); 793 if (rq == PT_SUSPEND) 794 (*lt)->l_flag |= LW_DBGSUSPEND; 795 else { 796 (*lt)->l_flag &= ~LW_DBGSUSPEND; 797 if ((*lt)->l_flag != LSSUSPENDED) 798 (*lt)->l_stat = LSSTOP; 799 } 800 lwp_unlock(*lt); 801 return 0; 802 } 803 804 #ifdef PT_REGISTERS 805 static int 806 ptrace_uio_dir(int req) 807 { 808 switch (req) { 809 case_PT_GETREGS 810 case_PT_GETFPREGS 811 case_PT_GETDBREGS 812 return UIO_READ; 813 case_PT_SETREGS 814 case_PT_SETFPREGS 815 case_PT_SETDBREGS 816 return UIO_WRITE; 817 default: 818 return -1; 819 } 820 } 821 822 static int 823 ptrace_regs(struct lwp *l, struct lwp **lt, int rq, struct ptrace_methods *ptm, 824 void *addr, size_t data) 825 { 826 int error; 827 struct proc *t = (*lt)->l_proc; 828 struct vmspace *vm; 829 830 if ((error = ptrace_update_lwp(t, lt, data)) != 0) 831 return error; 832 833 int dir = ptrace_uio_dir(rq); 834 size_t size; 835 int (*func)(struct lwp *, struct lwp *, struct uio *); 836 837 DPRINTF(("%s: lwp=%d request=%d\n", __func__, l->l_lid, rq)); 838 839 switch (rq) { 840 #if defined(PT_SETREGS) || defined(PT_GETREGS) 841 case_PT_GETREGS 842 case_PT_SETREGS 843 if (!process_validregs(*lt)) 844 return EINVAL; 845 size = PROC_REGSZ(t); 846 func = ptm->ptm_doregs; 847 break; 848 #endif 849 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 850 case_PT_GETFPREGS 851 case_PT_SETFPREGS 852 if (!process_validfpregs(*lt)) 853 return EINVAL; 854 size = PROC_FPREGSZ(t); 855 func = ptm->ptm_dofpregs; 856 break; 857 #endif 858 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 859 case_PT_GETDBREGS 860 case_PT_SETDBREGS 861 if (!process_validdbregs(*lt)) 862 return EINVAL; 863 size = PROC_DBREGSZ(t); 864 func = ptm->ptm_dodbregs; 865 break; 866 #endif 867 default: 868 return EINVAL; 869 } 870 871 error = proc_vmspace_getref(l->l_proc, &vm); 872 if (error) 873 return error; 874 875 struct uio uio; 876 struct iovec iov; 877 878 iov.iov_base = addr; 879 iov.iov_len = size; 880 uio.uio_iov = &iov; 881 uio.uio_iovcnt = 1; 882 uio.uio_offset = 0; 883 uio.uio_resid = iov.iov_len; 884 uio.uio_rw = dir; 885 uio.uio_vmspace = vm; 886 887 error = (*func)(l, *lt, &uio); 888 uvmspace_free(vm); 889 return error; 890 } 891 #endif 892 893 static int 894 ptrace_sendsig(struct proc *t, struct lwp *lt, int signo, int resume_all) 895 { 896 ksiginfo_t ksi; 897 898 /* Finally, deliver the requested signal (or none). */ 899 if (t->p_stat == SSTOP) { 900 /* 901 * Unstop the process. If it needs to take a 902 * signal, make all efforts to ensure that at 903 * an LWP runs to see it. 904 */ 905 t->p_xsig = signo; 906 907 /* 908 * signo > 0 check prevents a potential panic, as 909 * sigismember(&...,0) is invalid check and signo 910 * can be equal to 0 as a special case of no-signal. 911 */ 912 if (signo > 0 && sigismember(&stopsigmask, signo)) { 913 t->p_waited = 0; 914 child_psignal(t, 0); 915 } else if (resume_all) 916 proc_unstop(t); 917 else 918 lwp_unstop(lt); 919 return 0; 920 } 921 922 KSI_INIT_EMPTY(&ksi); 923 if (t->p_sigctx.ps_faked) { 924 if (signo != t->p_sigctx.ps_info._signo) 925 return EINVAL; 926 t->p_sigctx.ps_faked = false; 927 ksi.ksi_info = t->p_sigctx.ps_info; 928 ksi.ksi_lid = t->p_sigctx.ps_lwp; 929 } else if (signo == 0) { 930 return 0; 931 } else { 932 ksi.ksi_signo = signo; 933 } 934 DPRINTF(("%s: pid=%d.%d signal=%d resume_all=%d\n", __func__, t->p_pid, 935 t->p_sigctx.ps_lwp, signo, resume_all)); 936 937 kpsignal2(t, &ksi); 938 return 0; 939 } 940 941 static int 942 ptrace_dumpcore(struct lwp *lt, char *path, size_t len) 943 { 944 int error; 945 if (path != NULL) { 946 947 if (len >= MAXPATHLEN) 948 return EINVAL; 949 950 char *src = path; 951 path = kmem_alloc(len + 1, KM_SLEEP); 952 error = copyin(src, path, len); 953 if (error) 954 goto out; 955 path[len] = '\0'; 956 } 957 DPRINTF(("%s: lwp=%d\n", __func__, lt->l_lid)); 958 error = (*coredump_vec)(lt, path); 959 out: 960 if (path) 961 kmem_free(path, len + 1); 962 return error; 963 } 964 965 static int 966 ptrace_doio(struct lwp *l, struct proc *t, struct lwp *lt, 967 struct ptrace_io_desc *piod, void *addr, bool sysspace) 968 { 969 struct uio uio; 970 struct iovec iov; 971 int error, tmp; 972 973 error = 0; 974 iov.iov_base = piod->piod_addr; 975 iov.iov_len = piod->piod_len; 976 uio.uio_iov = &iov; 977 uio.uio_iovcnt = 1; 978 uio.uio_offset = (off_t)(unsigned long)piod->piod_offs; 979 uio.uio_resid = piod->piod_len; 980 981 DPRINTF(("%s: lwp=%d request=%d\n", __func__, l->l_lid, piod->piod_op)); 982 983 switch (piod->piod_op) { 984 case PIOD_READ_D: 985 case PIOD_READ_I: 986 uio.uio_rw = UIO_READ; 987 break; 988 case PIOD_WRITE_D: 989 case PIOD_WRITE_I: 990 /* 991 * Can't write to a RAS 992 */ 993 if (ras_lookup(t, addr) != (void *)-1) { 994 return EACCES; 995 } 996 uio.uio_rw = UIO_WRITE; 997 break; 998 case PIOD_READ_AUXV: 999 uio.uio_rw = UIO_READ; 1000 tmp = t->p_execsw->es_arglen; 1001 if (uio.uio_offset > tmp) 1002 return EIO; 1003 if (uio.uio_resid > tmp - uio.uio_offset) 1004 uio.uio_resid = tmp - uio.uio_offset; 1005 piod->piod_len = iov.iov_len = uio.uio_resid; 1006 error = process_auxv_offset(t, &uio); 1007 break; 1008 default: 1009 error = EINVAL; 1010 break; 1011 } 1012 1013 if (error) 1014 return error; 1015 1016 if (sysspace) { 1017 uio.uio_vmspace = vmspace_kernel(); 1018 } else { 1019 error = proc_vmspace_getref(l->l_proc, &uio.uio_vmspace); 1020 if (error) 1021 return error; 1022 } 1023 1024 error = process_domem(l, lt, &uio); 1025 if (!sysspace) 1026 uvmspace_free(uio.uio_vmspace); 1027 if (error) 1028 return error; 1029 piod->piod_len -= uio.uio_resid; 1030 return 0; 1031 } 1032 1033 int 1034 do_ptrace(struct ptrace_methods *ptm, struct lwp *l, int req, pid_t pid, 1035 void *addr, int data, register_t *retval) 1036 { 1037 struct proc *p = l->l_proc; 1038 struct lwp *lt = NULL; 1039 struct lwp *lt2; 1040 struct proc *t; /* target process */ 1041 struct ptrace_io_desc piod; 1042 int error, write, tmp, pheld; 1043 int signo = 0; 1044 int resume_all; 1045 bool locked; 1046 error = 0; 1047 1048 /* 1049 * If attaching or detaching, we need to get a write hold on the 1050 * proclist lock so that we can re-parent the target process. 1051 */ 1052 mutex_enter(proc_lock); 1053 1054 t = ptrace_find(l, req, pid); 1055 if (t == NULL) { 1056 mutex_exit(proc_lock); 1057 return ESRCH; 1058 } 1059 1060 pheld = 1; 1061 if ((error = ptrace_allowed(l, req, t, p, &locked)) != 0) 1062 goto out; 1063 1064 if ((error = kauth_authorize_process(l->l_cred, 1065 KAUTH_PROCESS_PTRACE, t, KAUTH_ARG(req), NULL, NULL)) != 0) 1066 goto out; 1067 1068 if ((lt = lwp_find_first(t)) == NULL) { 1069 error = ESRCH; 1070 goto out; 1071 } 1072 1073 /* Do single-step fixup if needed. */ 1074 FIX_SSTEP(t); 1075 KASSERT(lt != NULL); 1076 lwp_addref(lt); 1077 1078 /* 1079 * Which locks do we need held? XXX Ugly. 1080 */ 1081 if ((pheld = ptrace_needs_hold(req)) == 0) { 1082 mutex_exit(t->p_lock); 1083 mutex_exit(proc_lock); 1084 } 1085 1086 /* Now do the operation. */ 1087 write = 0; 1088 *retval = 0; 1089 tmp = 0; 1090 resume_all = 1; 1091 1092 switch (req) { 1093 case PT_TRACE_ME: 1094 /* Just set the trace flag. */ 1095 SET(t->p_slflag, PSL_TRACED); 1096 t->p_opptr = t->p_pptr; 1097 break; 1098 1099 /* 1100 * The I and D separate address space has been inherited from PDP-11. 1101 * The 16-bit UNIX started with a single address space per program, 1102 * but was extended to two 16-bit (2 x 64kb) address spaces. 1103 * 1104 * We no longer maintain this feature in maintained architectures, but 1105 * we keep the API for backward compatiblity. Currently the I and D 1106 * operations are exactly the same and not distinguished in debuggers. 1107 */ 1108 case PT_WRITE_I: 1109 case PT_WRITE_D: 1110 write = 1; 1111 tmp = data; 1112 /* FALLTHROUGH */ 1113 case PT_READ_I: 1114 case PT_READ_D: 1115 piod.piod_addr = &tmp; 1116 piod.piod_len = sizeof(tmp); 1117 piod.piod_offs = addr; 1118 piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D; 1119 if ((error = ptrace_doio(l, t, lt, &piod, addr, true)) != 0) 1120 break; 1121 /* 1122 * For legacy reasons we treat here two results as success: 1123 * - incomplete transfer piod.piod_len < sizeof(tmp) 1124 * - no transfer piod.piod_len == 0 1125 * 1126 * This means that there is no way to determine whether 1127 * transfer operation was performed in PT_WRITE and PT_READ 1128 * calls. 1129 */ 1130 if (!write) 1131 *retval = tmp; 1132 break; 1133 1134 case PT_IO: 1135 if ((error = ptm->ptm_copyin_piod(&piod, addr, data)) != 0) 1136 break; 1137 if (piod.piod_len < 1) { 1138 error = EINVAL; 1139 break; 1140 } 1141 if ((error = ptrace_doio(l, t, lt, &piod, addr, false)) != 0) 1142 break; 1143 /* 1144 * For legacy reasons we treat here two results as success: 1145 * - incomplete transfer piod.piod_len < sizeof(tmp) 1146 * - no transfer piod.piod_len == 0 1147 */ 1148 error = ptm->ptm_copyout_piod(&piod, addr, data); 1149 break; 1150 1151 case PT_DUMPCORE: 1152 error = ptrace_dumpcore(lt, addr, data); 1153 break; 1154 1155 #ifdef PT_STEP 1156 case PT_STEP: 1157 /* 1158 * From the 4.4BSD PRM: 1159 * "Execution continues as in request PT_CONTINUE; however 1160 * as soon as possible after execution of at least one 1161 * instruction, execution stops again. [ ... ]" 1162 */ 1163 #endif 1164 case PT_CONTINUE: 1165 case PT_SYSCALL: 1166 case PT_DETACH: 1167 if (req == PT_SYSCALL) { 1168 if (!ISSET(t->p_slflag, PSL_SYSCALL)) { 1169 SET(t->p_slflag, PSL_SYSCALL); 1170 #ifdef __HAVE_SYSCALL_INTERN 1171 (*t->p_emul->e_syscall_intern)(t); 1172 #endif 1173 } 1174 } else { 1175 if (ISSET(t->p_slflag, PSL_SYSCALL)) { 1176 CLR(t->p_slflag, PSL_SYSCALL); 1177 #ifdef __HAVE_SYSCALL_INTERN 1178 (*t->p_emul->e_syscall_intern)(t); 1179 #endif 1180 } 1181 } 1182 t->p_trace_enabled = trace_is_enabled(t); 1183 1184 /* 1185 * Pick up the LWPID, if supplied. There are two cases: 1186 * data < 0 : step or continue single thread, lwp = -data 1187 * data > 0 in PT_STEP : step this thread, continue others 1188 * For operations other than PT_STEP, data > 0 means 1189 * data is the signo to deliver to the process. 1190 */ 1191 tmp = data; 1192 if (tmp >= 0) { 1193 #ifdef PT_STEP 1194 if (req == PT_STEP) 1195 signo = 0; 1196 else 1197 #endif 1198 { 1199 signo = tmp; 1200 tmp = 0; /* don't search for LWP */ 1201 } 1202 } else if (tmp == INT_MIN) { 1203 error = ESRCH; 1204 break; 1205 } else { 1206 tmp = -tmp; 1207 } 1208 1209 if (tmp > 0) { 1210 if (req == PT_DETACH) { 1211 error = EINVAL; 1212 break; 1213 } 1214 lwp_delref2 (lt); 1215 lt = lwp_find(t, tmp); 1216 if (lt == NULL) { 1217 error = ESRCH; 1218 break; 1219 } 1220 lwp_addref(lt); 1221 resume_all = 0; 1222 signo = 0; 1223 } 1224 1225 /* 1226 * From the 4.4BSD PRM: 1227 * "The data argument is taken as a signal number and the 1228 * child's execution continues at location addr as if it 1229 * incurred that signal. Normally the signal number will 1230 * be either 0 to indicate that the signal that caused the 1231 * stop should be ignored, or that value fetched out of 1232 * the process's image indicating which signal caused 1233 * the stop. If addr is (int *)1 then execution continues 1234 * from where it stopped." 1235 */ 1236 1237 /* Check that the data is a valid signal number or zero. */ 1238 if (signo < 0 || signo >= NSIG) { 1239 error = EINVAL; 1240 break; 1241 } 1242 1243 /* Prevent process deadlock */ 1244 if (resume_all) { 1245 #ifdef PT_STEP 1246 if (req == PT_STEP) { 1247 if (lt->l_flag & 1248 (LW_WSUSPEND | LW_DBGSUSPEND)) { 1249 error = EDEADLK; 1250 break; 1251 } 1252 } else 1253 #endif 1254 { 1255 error = EDEADLK; 1256 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1257 if ((lt2->l_flag & 1258 (LW_WSUSPEND | LW_DBGSUSPEND)) == 0 1259 ) { 1260 error = 0; 1261 break; 1262 } 1263 } 1264 if (error != 0) 1265 break; 1266 } 1267 } else { 1268 if (lt->l_flag & (LW_WSUSPEND | LW_DBGSUSPEND)) { 1269 error = EDEADLK; 1270 break; 1271 } 1272 } 1273 1274 /* 1275 * Reject setting program cunter to 0x0 if VA0 is disabled. 1276 * 1277 * Not all kernels implement this feature to set Program 1278 * Counter in one go in PT_CONTINUE and similar operations. 1279 * This causes portability issues as passing address 0x0 1280 * on these kernels is no-operation, but can cause failure 1281 * in most cases on NetBSD. 1282 */ 1283 if (user_va0_disable && addr == 0) { 1284 error = EINVAL; 1285 break; 1286 } 1287 1288 /* If the address parameter is not (int *)1, set the pc. */ 1289 if ((int *)addr != (int *)1) { 1290 error = process_set_pc(lt, addr); 1291 if (error != 0) 1292 break; 1293 } 1294 #ifdef PT_STEP 1295 /* 1296 * Arrange for a single-step, if that's requested and possible. 1297 * More precisely, set the single step status as requested for 1298 * the requested thread, and clear it for other threads. 1299 */ 1300 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1301 if (ISSET(lt2->l_pflag, LP_SINGLESTEP)) { 1302 lwp_lock(lt2); 1303 process_sstep(lt2, 1); 1304 lwp_unlock(lt2); 1305 } else if (lt != lt2) { 1306 lwp_lock(lt2); 1307 process_sstep(lt2, 0); 1308 lwp_unlock(lt2); 1309 } 1310 } 1311 error = process_sstep(lt, 1312 ISSET(lt->l_pflag, LP_SINGLESTEP) || req == PT_STEP); 1313 if (error) 1314 break; 1315 #endif 1316 if (req == PT_DETACH) { 1317 CLR(t->p_slflag, PSL_TRACED|PSL_SYSCALL); 1318 1319 /* give process back to original parent or init */ 1320 if (t->p_opptr != t->p_pptr) { 1321 struct proc *pp = t->p_opptr; 1322 proc_reparent(t, pp ? pp : initproc); 1323 } 1324 1325 /* not being traced any more */ 1326 t->p_opptr = NULL; 1327 1328 /* clear single step */ 1329 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1330 CLR(lt2->l_pflag, LP_SINGLESTEP); 1331 } 1332 CLR(lt->l_pflag, LP_SINGLESTEP); 1333 } 1334 sendsig: 1335 error = ptrace_sendsig(t, lt, signo, resume_all); 1336 break; 1337 1338 case PT_SYSCALLEMU: 1339 if (!ISSET(t->p_slflag, PSL_SYSCALL) || t->p_stat != SSTOP) { 1340 error = EINVAL; 1341 break; 1342 } 1343 SET(t->p_slflag, PSL_SYSCALLEMU); 1344 break; 1345 1346 #ifdef PT_STEP 1347 case PT_SETSTEP: 1348 write = 1; 1349 1350 /* FALLTHROUGH */ 1351 case PT_CLEARSTEP: 1352 /* write = 0 done above. */ 1353 if ((error = ptrace_update_lwp(t, <, data)) != 0) 1354 break; 1355 1356 if (write) 1357 SET(lt->l_pflag, LP_SINGLESTEP); 1358 else 1359 CLR(lt->l_pflag, LP_SINGLESTEP); 1360 break; 1361 #endif 1362 1363 case PT_KILL: 1364 /* just send the process a KILL signal. */ 1365 signo = SIGKILL; 1366 goto sendsig; /* in PT_CONTINUE, above. */ 1367 1368 case PT_ATTACH: 1369 /* 1370 * Go ahead and set the trace flag. 1371 * Save the old parent (it's reset in 1372 * _DETACH, and also in kern_exit.c:wait4() 1373 * Reparent the process so that the tracing 1374 * proc gets to see all the action. 1375 * Stop the target. 1376 */ 1377 proc_changeparent(t, p); 1378 signo = SIGSTOP; 1379 goto sendsig; 1380 1381 case PT_GET_EVENT_MASK: 1382 error = ptrace_get_event_mask(t, addr, data); 1383 break; 1384 1385 case PT_SET_EVENT_MASK: 1386 error = ptrace_set_event_mask(t, addr, data); 1387 break; 1388 1389 case PT_GET_PROCESS_STATE: 1390 error = ptrace_get_process_state(t, addr, data); 1391 break; 1392 1393 case PT_LWPINFO: 1394 error = ptrace_lwpinfo(t, <, addr, data); 1395 break; 1396 1397 case PT_SET_SIGINFO: 1398 error = ptrace_set_siginfo(t, <, ptm, addr, data); 1399 break; 1400 1401 case PT_GET_SIGINFO: 1402 error = ptrace_get_siginfo(t, ptm, addr, data); 1403 break; 1404 1405 case PT_RESUME: 1406 case PT_SUSPEND: 1407 error = ptrace_startstop(t, <, req, addr, data); 1408 break; 1409 1410 #ifdef PT_REGISTERS 1411 case_PT_SETREGS 1412 case_PT_GETREGS 1413 case_PT_SETFPREGS 1414 case_PT_GETFPREGS 1415 case_PT_SETDBREGS 1416 case_PT_GETDBREGS 1417 error = ptrace_regs(l, <, req, ptm, addr, data); 1418 break; 1419 #endif 1420 1421 #ifdef __HAVE_PTRACE_MACHDEP 1422 PTRACE_MACHDEP_REQUEST_CASES 1423 error = ptrace_machdep_dorequest(l, lt, req, addr, data); 1424 break; 1425 #endif 1426 } 1427 1428 out: 1429 if (pheld) { 1430 mutex_exit(t->p_lock); 1431 mutex_exit(proc_lock); 1432 } 1433 if (lt != NULL) 1434 lwp_delref(lt); 1435 if (locked) 1436 rw_exit(&t->p_reflock); 1437 1438 return error; 1439 } 1440 1441 typedef int (*regrfunc_t)(struct lwp *, void *, size_t *); 1442 typedef int (*regwfunc_t)(struct lwp *, void *, size_t); 1443 1444 #ifdef PT_REGISTERS 1445 static int 1446 proc_regio(struct lwp *l, struct uio *uio, size_t ks, regrfunc_t r, 1447 regwfunc_t w) 1448 { 1449 char buf[1024]; 1450 int error; 1451 char *kv; 1452 size_t kl; 1453 1454 if (ks > sizeof(buf)) 1455 return E2BIG; 1456 1457 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)ks) 1458 return EINVAL; 1459 1460 kv = buf + uio->uio_offset; 1461 kl = ks - uio->uio_offset; 1462 1463 if (kl > uio->uio_resid) 1464 kl = uio->uio_resid; 1465 1466 error = (*r)(l, buf, &ks); 1467 if (error == 0) 1468 error = uiomove(kv, kl, uio); 1469 if (error == 0 && uio->uio_rw == UIO_WRITE) { 1470 if (l->l_stat != LSSTOP) 1471 error = EBUSY; 1472 else 1473 error = (*w)(l, buf, ks); 1474 } 1475 1476 uio->uio_offset = 0; 1477 return error; 1478 } 1479 #endif 1480 1481 int 1482 process_doregs(struct lwp *curl /*tracer*/, 1483 struct lwp *l /*traced*/, 1484 struct uio *uio) 1485 { 1486 #if defined(PT_GETREGS) || defined(PT_SETREGS) 1487 size_t s; 1488 regrfunc_t r; 1489 regwfunc_t w; 1490 1491 #ifdef COMPAT_NETBSD32 1492 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1493 1494 if (__predict_false(pk32)) { 1495 if ((l->l_proc->p_flag & PK_32) == 0) { 1496 // 32 bit tracer can't trace 64 bit process 1497 return EINVAL; 1498 } 1499 s = sizeof(process_reg32); 1500 r = (regrfunc_t)process_read_regs32; 1501 w = (regwfunc_t)process_write_regs32; 1502 } else 1503 #endif 1504 { 1505 s = sizeof(struct reg); 1506 r = (regrfunc_t)process_read_regs; 1507 w = (regwfunc_t)process_write_regs; 1508 } 1509 return proc_regio(l, uio, s, r, w); 1510 #else 1511 return EINVAL; 1512 #endif 1513 } 1514 1515 int 1516 process_validregs(struct lwp *l) 1517 { 1518 1519 #if defined(PT_SETREGS) || defined(PT_GETREGS) 1520 return (l->l_flag & LW_SYSTEM) == 0; 1521 #else 1522 return 0; 1523 #endif 1524 } 1525 1526 int 1527 process_dofpregs(struct lwp *curl /*tracer*/, 1528 struct lwp *l /*traced*/, 1529 struct uio *uio) 1530 { 1531 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 1532 size_t s; 1533 regrfunc_t r; 1534 regwfunc_t w; 1535 1536 #ifdef COMPAT_NETBSD32 1537 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1538 1539 if (__predict_false(pk32)) { 1540 if ((l->l_proc->p_flag & PK_32) == 0) { 1541 // 32 bit tracer can't trace 64 bit process 1542 return EINVAL; 1543 } 1544 s = sizeof(process_fpreg32); 1545 r = (regrfunc_t)process_read_fpregs32; 1546 w = (regwfunc_t)process_write_fpregs32; 1547 } else 1548 #endif 1549 { 1550 s = sizeof(struct fpreg); 1551 r = (regrfunc_t)process_read_fpregs; 1552 w = (regwfunc_t)process_write_fpregs; 1553 } 1554 return proc_regio(l, uio, s, r, w); 1555 #else 1556 return EINVAL; 1557 #endif 1558 } 1559 1560 int 1561 process_validfpregs(struct lwp *l) 1562 { 1563 1564 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 1565 return (l->l_flag & LW_SYSTEM) == 0; 1566 #else 1567 return 0; 1568 #endif 1569 } 1570 1571 int 1572 process_dodbregs(struct lwp *curl /*tracer*/, 1573 struct lwp *l /*traced*/, 1574 struct uio *uio) 1575 { 1576 #if defined(PT_GETDBREGS) || defined(PT_SETDBREGS) 1577 size_t s; 1578 regrfunc_t r; 1579 regwfunc_t w; 1580 1581 #ifdef COMPAT_NETBSD32 1582 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1583 1584 if (__predict_false(pk32)) { 1585 if ((l->l_proc->p_flag & PK_32) == 0) { 1586 // 32 bit tracer can't trace 64 bit process 1587 return EINVAL; 1588 } 1589 s = sizeof(process_dbreg32); 1590 r = (regrfunc_t)process_read_dbregs32; 1591 w = (regwfunc_t)process_write_dbregs32; 1592 } else 1593 #endif 1594 { 1595 s = sizeof(struct dbreg); 1596 r = (regrfunc_t)process_read_dbregs; 1597 w = (regwfunc_t)process_write_dbregs; 1598 } 1599 return proc_regio(l, uio, s, r, w); 1600 #else 1601 return EINVAL; 1602 #endif 1603 } 1604 1605 int 1606 process_validdbregs(struct lwp *l) 1607 { 1608 1609 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 1610 return (l->l_flag & LW_SYSTEM) == 0; 1611 #else 1612 return 0; 1613 #endif 1614 } 1615 1616 static int 1617 process_auxv_offset(struct proc *p, struct uio *uio) 1618 { 1619 struct ps_strings pss; 1620 int error; 1621 off_t off = (off_t)p->p_psstrp; 1622 1623 if ((error = copyin_psstrings(p, &pss)) != 0) 1624 return error; 1625 1626 if (pss.ps_envstr == NULL) 1627 return EIO; 1628 1629 uio->uio_offset += (off_t)(vaddr_t)(pss.ps_envstr + pss.ps_nenvstr + 1); 1630 #ifdef __MACHINE_STACK_GROWS_UP 1631 if (uio->uio_offset < off) 1632 return EIO; 1633 #else 1634 if (uio->uio_offset > off) 1635 return EIO; 1636 if ((uio->uio_offset + uio->uio_resid) > off) 1637 uio->uio_resid = off - uio->uio_offset; 1638 #endif 1639 return 0; 1640 } 1641 #endif /* PTRACE */ 1642 1643 MODULE(MODULE_CLASS_EXEC, ptrace_common, NULL); 1644 1645 static int 1646 ptrace_common_modcmd(modcmd_t cmd, void *arg) 1647 { 1648 int error; 1649 1650 switch (cmd) { 1651 case MODULE_CMD_INIT: 1652 error = ptrace_init(); 1653 break; 1654 case MODULE_CMD_FINI: 1655 error = ptrace_fini(); 1656 break; 1657 default: 1658 ptrace_hooks(); 1659 error = ENOTTY; 1660 break; 1661 } 1662 return error; 1663 } 1664
Indexes created Tue Sep 30 20:09:53 GMT 2025