sys_ptrace_common.c revision 1.58.2.3
1 /* $NetBSD: sys_ptrace_common.c,v 1.58.2.3 2019/10/15 18:38:39 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 1.58.2.3 2019/10/15 18:38:39 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 ps.pe_report_event = si->_reason._ptrace_state._pe_report_event; 706 707 CTASSERT(sizeof(ps.pe_other_pid) == 708 sizeof(si->_reason._ptrace_state._option._pe_other_pid)); 709 CTASSERT(sizeof(ps.pe_lwp) == 710 sizeof(si->_reason._ptrace_state._option._pe_other_pid)); 711 CTASSERT(sizeof(ps.pe_other_pid) == sizeof(ps.pe_lwp)); 712 713 ps.pe_other_pid = 714 si->_reason._ptrace_state._option._pe_other_pid; 715 } 716 717 DPRINTF(("%s: lwp=%d event=%#x pid=%d lwp=%d\n", __func__, 718 t->p_sigctx.ps_lwp, ps.pe_report_event, 719 ps.pe_other_pid, ps.pe_lwp)); 720 return copyout(&ps, addr, sizeof(ps)); 721 } 722 723 static int 724 ptrace_lwpinfo(struct proc *t, struct lwp **lt, void *addr, size_t data) 725 { 726 struct ptrace_lwpinfo pl; 727 728 if (data != sizeof(pl)) { 729 DPRINTF(("%s: %zu != %zu\n", __func__, data, sizeof(pl))); 730 return EINVAL; 731 } 732 int error = copyin(addr, &pl, sizeof(pl)); 733 if (error) 734 return error; 735 736 lwpid_t tmp = pl.pl_lwpid; 737 lwp_delref(*lt); 738 mutex_enter(t->p_lock); 739 if (tmp == 0) 740 *lt = lwp_find_first(t); 741 else { 742 *lt = lwp_find(t, tmp); 743 if (*lt == NULL) { 744 mutex_exit(t->p_lock); 745 return ESRCH; 746 } 747 *lt = LIST_NEXT(*lt, l_sibling); 748 } 749 750 while (*lt != NULL && !lwp_alive(*lt)) 751 *lt = LIST_NEXT(*lt, l_sibling); 752 753 pl.pl_lwpid = 0; 754 pl.pl_event = 0; 755 if (*lt) { 756 lwp_addref(*lt); 757 pl.pl_lwpid = (*lt)->l_lid; 758 759 if ((*lt)->l_flag & LW_WSUSPEND) 760 pl.pl_event = PL_EVENT_SUSPENDED; 761 /* 762 * If we match the lwp, or it was sent to every lwp, 763 * we set PL_EVENT_SIGNAL. 764 * XXX: ps_lwp == 0 means everyone and noone, so 765 * check ps_signo too. 766 */ 767 else if ((*lt)->l_lid == t->p_sigctx.ps_lwp 768 || (t->p_sigctx.ps_lwp == 0 && 769 t->p_sigctx.ps_info._signo)) { 770 DPRINTF(("%s: lwp=%d siglwp=%d signo %d\n", __func__, 771 pl.pl_lwpid, t->p_sigctx.ps_lwp, 772 t->p_sigctx.ps_info._signo)); 773 pl.pl_event = PL_EVENT_SIGNAL; 774 } 775 } 776 mutex_exit(t->p_lock); 777 DPRINTF(("%s: lwp=%d event=%#x\n", __func__, 778 pl.pl_lwpid, pl.pl_event)); 779 780 return copyout(&pl, addr, sizeof(pl)); 781 } 782 783 static int 784 ptrace_startstop(struct proc *t, struct lwp **lt, int rq, void *addr, 785 size_t data) 786 { 787 int error; 788 789 if ((error = ptrace_update_lwp(t, lt, data)) != 0) 790 return error; 791 792 DPRINTF(("%s: lwp=%d request=%d\n", __func__, (*lt)->l_lid, rq)); 793 lwp_lock(*lt); 794 if (rq == PT_SUSPEND) 795 (*lt)->l_flag |= LW_WSUSPEND; 796 else 797 (*lt)->l_flag &= ~LW_WSUSPEND; 798 lwp_unlock(*lt); 799 return 0; 800 } 801 802 #ifdef PT_REGISTERS 803 static int 804 ptrace_uio_dir(int req) 805 { 806 switch (req) { 807 case_PT_GETREGS 808 case_PT_GETFPREGS 809 case_PT_GETDBREGS 810 return UIO_READ; 811 case_PT_SETREGS 812 case_PT_SETFPREGS 813 case_PT_SETDBREGS 814 return UIO_WRITE; 815 default: 816 return -1; 817 } 818 } 819 820 static int 821 ptrace_regs(struct lwp *l, struct lwp **lt, int rq, struct ptrace_methods *ptm, 822 void *addr, size_t data) 823 { 824 int error; 825 struct proc *t = (*lt)->l_proc; 826 struct vmspace *vm; 827 828 if ((error = ptrace_update_lwp(t, lt, data)) != 0) 829 return error; 830 831 int dir = ptrace_uio_dir(rq); 832 size_t size; 833 int (*func)(struct lwp *, struct lwp *, struct uio *); 834 835 DPRINTF(("%s: lwp=%d request=%d\n", __func__, l->l_lid, rq)); 836 837 switch (rq) { 838 #if defined(PT_SETREGS) || defined(PT_GETREGS) 839 case_PT_GETREGS 840 case_PT_SETREGS 841 if (!process_validregs(*lt)) 842 return EINVAL; 843 size = PROC_REGSZ(t); 844 func = ptm->ptm_doregs; 845 break; 846 #endif 847 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 848 case_PT_GETFPREGS 849 case_PT_SETFPREGS 850 if (!process_validfpregs(*lt)) 851 return EINVAL; 852 size = PROC_FPREGSZ(t); 853 func = ptm->ptm_dofpregs; 854 break; 855 #endif 856 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 857 case_PT_GETDBREGS 858 case_PT_SETDBREGS 859 if (!process_validdbregs(*lt)) 860 return EINVAL; 861 size = PROC_DBREGSZ(t); 862 func = ptm->ptm_dodbregs; 863 break; 864 #endif 865 default: 866 return EINVAL; 867 } 868 869 error = proc_vmspace_getref(l->l_proc, &vm); 870 if (error) 871 return error; 872 873 struct uio uio; 874 struct iovec iov; 875 876 iov.iov_base = addr; 877 iov.iov_len = size; 878 uio.uio_iov = &iov; 879 uio.uio_iovcnt = 1; 880 uio.uio_offset = 0; 881 uio.uio_resid = iov.iov_len; 882 uio.uio_rw = dir; 883 uio.uio_vmspace = vm; 884 885 error = (*func)(l, *lt, &uio); 886 uvmspace_free(vm); 887 return error; 888 } 889 #endif 890 891 static int 892 ptrace_sendsig(struct proc *t, struct lwp *lt, int signo, int resume_all) 893 { 894 ksiginfo_t ksi; 895 896 /* Finally, deliver the requested signal (or none). */ 897 if (t->p_stat == SSTOP) { 898 /* 899 * Unstop the process. If it needs to take a 900 * signal, make all efforts to ensure that at 901 * an LWP runs to see it. 902 */ 903 t->p_xsig = signo; 904 905 /* 906 * signo > 0 check prevents a potential panic, as 907 * sigismember(&...,0) is invalid check and signo 908 * can be equal to 0 as a special case of no-signal. 909 */ 910 if (signo > 0 && sigismember(&stopsigmask, signo)) { 911 t->p_waited = 0; 912 child_psignal(t, 0); 913 } else if (resume_all) 914 proc_unstop(t); 915 else 916 lwp_unstop(lt); 917 return 0; 918 } 919 920 KSI_INIT_EMPTY(&ksi); 921 if (t->p_sigctx.ps_faked) { 922 if (signo != t->p_sigctx.ps_info._signo) 923 return EINVAL; 924 t->p_sigctx.ps_faked = false; 925 ksi.ksi_info = t->p_sigctx.ps_info; 926 ksi.ksi_lid = t->p_sigctx.ps_lwp; 927 } else if (signo == 0) { 928 return 0; 929 } else { 930 ksi.ksi_signo = signo; 931 } 932 DPRINTF(("%s: pid=%d.%d signal=%d resume_all=%d\n", __func__, t->p_pid, 933 t->p_sigctx.ps_lwp, signo, resume_all)); 934 935 kpsignal2(t, &ksi); 936 return 0; 937 } 938 939 static int 940 ptrace_dumpcore(struct lwp *lt, char *path, size_t len) 941 { 942 int error; 943 if (path != NULL) { 944 945 if (len >= MAXPATHLEN) 946 return EINVAL; 947 948 char *src = path; 949 path = kmem_alloc(len + 1, KM_SLEEP); 950 error = copyin(src, path, len); 951 if (error) 952 goto out; 953 path[len] = '\0'; 954 } 955 DPRINTF(("%s: lwp=%d\n", __func__, lt->l_lid)); 956 error = (*coredump_vec)(lt, path); 957 out: 958 if (path) 959 kmem_free(path, len + 1); 960 return error; 961 } 962 963 static int 964 ptrace_doio(struct lwp *l, struct proc *t, struct lwp *lt, 965 struct ptrace_io_desc *piod, void *addr, bool sysspace) 966 { 967 struct uio uio; 968 struct iovec iov; 969 int error, tmp; 970 971 error = 0; 972 iov.iov_base = piod->piod_addr; 973 iov.iov_len = piod->piod_len; 974 uio.uio_iov = &iov; 975 uio.uio_iovcnt = 1; 976 uio.uio_offset = (off_t)(unsigned long)piod->piod_offs; 977 uio.uio_resid = piod->piod_len; 978 979 DPRINTF(("%s: lwp=%d request=%d\n", __func__, l->l_lid, piod->piod_op)); 980 981 switch (piod->piod_op) { 982 case PIOD_READ_D: 983 case PIOD_READ_I: 984 uio.uio_rw = UIO_READ; 985 break; 986 case PIOD_WRITE_D: 987 case PIOD_WRITE_I: 988 /* 989 * Can't write to a RAS 990 */ 991 if (ras_lookup(t, addr) != (void *)-1) { 992 return EACCES; 993 } 994 uio.uio_rw = UIO_WRITE; 995 break; 996 case PIOD_READ_AUXV: 997 uio.uio_rw = UIO_READ; 998 tmp = t->p_execsw->es_arglen; 999 if (uio.uio_offset > tmp) 1000 return EIO; 1001 if (uio.uio_resid > tmp - uio.uio_offset) 1002 uio.uio_resid = tmp - uio.uio_offset; 1003 piod->piod_len = iov.iov_len = uio.uio_resid; 1004 error = process_auxv_offset(t, &uio); 1005 break; 1006 default: 1007 error = EINVAL; 1008 break; 1009 } 1010 1011 if (error) 1012 return error; 1013 1014 if (sysspace) { 1015 uio.uio_vmspace = vmspace_kernel(); 1016 } else { 1017 error = proc_vmspace_getref(l->l_proc, &uio.uio_vmspace); 1018 if (error) 1019 return error; 1020 } 1021 1022 error = process_domem(l, lt, &uio); 1023 if (!sysspace) 1024 uvmspace_free(uio.uio_vmspace); 1025 if (error) 1026 return error; 1027 piod->piod_len -= uio.uio_resid; 1028 return 0; 1029 } 1030 1031 int 1032 do_ptrace(struct ptrace_methods *ptm, struct lwp *l, int req, pid_t pid, 1033 void *addr, int data, register_t *retval) 1034 { 1035 struct proc *p = l->l_proc; 1036 struct lwp *lt = NULL; 1037 struct lwp *lt2; 1038 struct proc *t; /* target process */ 1039 struct ptrace_io_desc piod; 1040 int error, write, tmp, pheld; 1041 int signo = 0; 1042 int resume_all; 1043 bool locked; 1044 error = 0; 1045 1046 /* 1047 * If attaching or detaching, we need to get a write hold on the 1048 * proclist lock so that we can re-parent the target process. 1049 */ 1050 mutex_enter(proc_lock); 1051 1052 t = ptrace_find(l, req, pid); 1053 if (t == NULL) { 1054 mutex_exit(proc_lock); 1055 return ESRCH; 1056 } 1057 1058 pheld = 1; 1059 if ((error = ptrace_allowed(l, req, t, p, &locked)) != 0) 1060 goto out; 1061 1062 if ((error = kauth_authorize_process(l->l_cred, 1063 KAUTH_PROCESS_PTRACE, t, KAUTH_ARG(req), NULL, NULL)) != 0) 1064 goto out; 1065 1066 if ((lt = lwp_find_first(t)) == NULL) { 1067 error = ESRCH; 1068 goto out; 1069 } 1070 1071 /* Do single-step fixup if needed. */ 1072 FIX_SSTEP(t); 1073 KASSERT(lt != NULL); 1074 lwp_addref(lt); 1075 1076 /* 1077 * Which locks do we need held? XXX Ugly. 1078 */ 1079 if ((pheld = ptrace_needs_hold(req)) == 0) { 1080 mutex_exit(t->p_lock); 1081 mutex_exit(proc_lock); 1082 } 1083 1084 /* Now do the operation. */ 1085 write = 0; 1086 *retval = 0; 1087 tmp = 0; 1088 resume_all = 1; 1089 1090 switch (req) { 1091 case PT_TRACE_ME: 1092 /* Just set the trace flag. */ 1093 SET(t->p_slflag, PSL_TRACED); 1094 t->p_opptr = t->p_pptr; 1095 break; 1096 1097 /* 1098 * The I and D separate address space has been inherited from PDP-11. 1099 * The 16-bit UNIX started with a single address space per program, 1100 * but was extended to two 16-bit (2 x 64kb) address spaces. 1101 * 1102 * We no longer maintain this feature in maintained architectures, but 1103 * we keep the API for backward compatiblity. Currently the I and D 1104 * operations are exactly the same and not distinguished in debuggers. 1105 */ 1106 case PT_WRITE_I: 1107 case PT_WRITE_D: 1108 write = 1; 1109 tmp = data; 1110 /* FALLTHROUGH */ 1111 case PT_READ_I: 1112 case PT_READ_D: 1113 piod.piod_addr = &tmp; 1114 piod.piod_len = sizeof(tmp); 1115 piod.piod_offs = addr; 1116 piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D; 1117 if ((error = ptrace_doio(l, t, lt, &piod, addr, true)) != 0) 1118 break; 1119 /* 1120 * For legacy reasons we treat here two results as success: 1121 * - incomplete transfer piod.piod_len < sizeof(tmp) 1122 * - no transfer piod.piod_len == 0 1123 * 1124 * This means that there is no way to determine whether 1125 * transfer operation was performed in PT_WRITE and PT_READ 1126 * calls. 1127 */ 1128 if (!write) 1129 *retval = tmp; 1130 break; 1131 1132 case PT_IO: 1133 if ((error = ptm->ptm_copyin_piod(&piod, addr, data)) != 0) 1134 break; 1135 if (piod.piod_len < 1) { 1136 error = EINVAL; 1137 break; 1138 } 1139 if ((error = ptrace_doio(l, t, lt, &piod, addr, false)) != 0) 1140 break; 1141 /* 1142 * For legacy reasons we treat here two results as success: 1143 * - incomplete transfer piod.piod_len < sizeof(tmp) 1144 * - no transfer piod.piod_len == 0 1145 */ 1146 error = ptm->ptm_copyout_piod(&piod, addr, data); 1147 break; 1148 1149 case PT_DUMPCORE: 1150 error = ptrace_dumpcore(lt, addr, data); 1151 break; 1152 1153 #ifdef PT_STEP 1154 case PT_STEP: 1155 /* 1156 * From the 4.4BSD PRM: 1157 * "Execution continues as in request PT_CONTINUE; however 1158 * as soon as possible after execution of at least one 1159 * instruction, execution stops again. [ ... ]" 1160 */ 1161 #endif 1162 case PT_CONTINUE: 1163 case PT_SYSCALL: 1164 case PT_DETACH: 1165 if (req == PT_SYSCALL) { 1166 if (!ISSET(t->p_slflag, PSL_SYSCALL)) { 1167 SET(t->p_slflag, PSL_SYSCALL); 1168 #ifdef __HAVE_SYSCALL_INTERN 1169 (*t->p_emul->e_syscall_intern)(t); 1170 #endif 1171 } 1172 } else { 1173 if (ISSET(t->p_slflag, PSL_SYSCALL)) { 1174 CLR(t->p_slflag, PSL_SYSCALL); 1175 #ifdef __HAVE_SYSCALL_INTERN 1176 (*t->p_emul->e_syscall_intern)(t); 1177 #endif 1178 } 1179 } 1180 t->p_trace_enabled = trace_is_enabled(t); 1181 1182 /* 1183 * Pick up the LWPID, if supplied. There are two cases: 1184 * data < 0 : step or continue single thread, lwp = -data 1185 * data > 0 in PT_STEP : step this thread, continue others 1186 * For operations other than PT_STEP, data > 0 means 1187 * data is the signo to deliver to the process. 1188 */ 1189 tmp = data; 1190 if (tmp >= 0) { 1191 #ifdef PT_STEP 1192 if (req == PT_STEP) 1193 signo = 0; 1194 else 1195 #endif 1196 { 1197 signo = tmp; 1198 tmp = 0; /* don't search for LWP */ 1199 } 1200 } else if (tmp == INT_MIN) { 1201 error = ESRCH; 1202 break; 1203 } else { 1204 tmp = -tmp; 1205 } 1206 1207 if (tmp > 0) { 1208 if (req == PT_DETACH) { 1209 error = EINVAL; 1210 break; 1211 } 1212 lwp_delref2 (lt); 1213 lt = lwp_find(t, tmp); 1214 if (lt == NULL) { 1215 error = ESRCH; 1216 break; 1217 } 1218 lwp_addref(lt); 1219 resume_all = 0; 1220 signo = 0; 1221 } 1222 1223 /* 1224 * From the 4.4BSD PRM: 1225 * "The data argument is taken as a signal number and the 1226 * child's execution continues at location addr as if it 1227 * incurred that signal. Normally the signal number will 1228 * be either 0 to indicate that the signal that caused the 1229 * stop should be ignored, or that value fetched out of 1230 * the process's image indicating which signal caused 1231 * the stop. If addr is (int *)1 then execution continues 1232 * from where it stopped." 1233 */ 1234 1235 /* Check that the data is a valid signal number or zero. */ 1236 if (signo < 0 || signo >= NSIG) { 1237 error = EINVAL; 1238 break; 1239 } 1240 1241 /* Prevent process deadlock */ 1242 if (resume_all) { 1243 #ifdef PT_STEP 1244 if (req == PT_STEP) { 1245 if (lt->l_flag & LW_WSUSPEND) { 1246 error = EDEADLK; 1247 break; 1248 } 1249 } else 1250 #endif 1251 { 1252 error = EDEADLK; 1253 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1254 if ((lt2->l_flag & LW_WSUSPEND) == 0) { 1255 error = 0; 1256 break; 1257 } 1258 } 1259 if (error != 0) 1260 break; 1261 } 1262 } else { 1263 if (lt->l_flag & LW_WSUSPEND) { 1264 error = EDEADLK; 1265 break; 1266 } 1267 } 1268 1269 /* 1270 * Reject setting program cunter to 0x0 if VA0 is disabled. 1271 * 1272 * Not all kernels implement this feature to set Program 1273 * Counter in one go in PT_CONTINUE and similar operations. 1274 * This causes portability issues as passing address 0x0 1275 * on these kernels is no-operation, but can cause failure 1276 * in most cases on NetBSD. 1277 */ 1278 if (user_va0_disable && addr == 0) { 1279 error = EINVAL; 1280 break; 1281 } 1282 1283 /* If the address parameter is not (int *)1, set the pc. */ 1284 if ((int *)addr != (int *)1) { 1285 error = process_set_pc(lt, addr); 1286 if (error != 0) 1287 break; 1288 } 1289 #ifdef PT_STEP 1290 /* 1291 * Arrange for a single-step, if that's requested and possible. 1292 * More precisely, set the single step status as requested for 1293 * the requested thread, and clear it for other threads. 1294 */ 1295 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1296 if (ISSET(lt2->l_pflag, LP_SINGLESTEP)) { 1297 lwp_lock(lt2); 1298 process_sstep(lt2, 1); 1299 lwp_unlock(lt2); 1300 } else if (lt != lt2) { 1301 lwp_lock(lt2); 1302 process_sstep(lt2, 0); 1303 lwp_unlock(lt2); 1304 } 1305 } 1306 error = process_sstep(lt, 1307 ISSET(lt->l_pflag, LP_SINGLESTEP) || req == PT_STEP); 1308 if (error) 1309 break; 1310 #endif 1311 if (req == PT_DETACH) { 1312 CLR(t->p_slflag, PSL_TRACED|PSL_SYSCALL); 1313 1314 /* give process back to original parent or init */ 1315 if (t->p_opptr != t->p_pptr) { 1316 struct proc *pp = t->p_opptr; 1317 proc_reparent(t, pp ? pp : initproc); 1318 } 1319 1320 /* not being traced any more */ 1321 t->p_opptr = NULL; 1322 1323 /* clear single step */ 1324 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1325 CLR(lt2->l_pflag, LP_SINGLESTEP); 1326 } 1327 CLR(lt->l_pflag, LP_SINGLESTEP); 1328 } 1329 sendsig: 1330 error = ptrace_sendsig(t, lt, signo, resume_all); 1331 break; 1332 1333 case PT_SYSCALLEMU: 1334 if (!ISSET(t->p_slflag, PSL_SYSCALL) || t->p_stat != SSTOP) { 1335 error = EINVAL; 1336 break; 1337 } 1338 SET(t->p_slflag, PSL_SYSCALLEMU); 1339 break; 1340 1341 #ifdef PT_STEP 1342 case PT_SETSTEP: 1343 write = 1; 1344 1345 /* FALLTHROUGH */ 1346 case PT_CLEARSTEP: 1347 /* write = 0 done above. */ 1348 if ((error = ptrace_update_lwp(t, <, data)) != 0) 1349 break; 1350 1351 if (write) 1352 SET(lt->l_pflag, LP_SINGLESTEP); 1353 else 1354 CLR(lt->l_pflag, LP_SINGLESTEP); 1355 break; 1356 #endif 1357 1358 case PT_KILL: 1359 /* just send the process a KILL signal. */ 1360 signo = SIGKILL; 1361 goto sendsig; /* in PT_CONTINUE, above. */ 1362 1363 case PT_ATTACH: 1364 /* 1365 * Go ahead and set the trace flag. 1366 * Save the old parent (it's reset in 1367 * _DETACH, and also in kern_exit.c:wait4() 1368 * Reparent the process so that the tracing 1369 * proc gets to see all the action. 1370 * Stop the target. 1371 */ 1372 proc_changeparent(t, p); 1373 signo = SIGSTOP; 1374 goto sendsig; 1375 1376 case PT_GET_EVENT_MASK: 1377 error = ptrace_get_event_mask(t, addr, data); 1378 break; 1379 1380 case PT_SET_EVENT_MASK: 1381 error = ptrace_set_event_mask(t, addr, data); 1382 break; 1383 1384 case PT_GET_PROCESS_STATE: 1385 error = ptrace_get_process_state(t, addr, data); 1386 break; 1387 1388 case PT_LWPINFO: 1389 error = ptrace_lwpinfo(t, <, addr, data); 1390 break; 1391 1392 case PT_SET_SIGINFO: 1393 error = ptrace_set_siginfo(t, <, ptm, addr, data); 1394 break; 1395 1396 case PT_GET_SIGINFO: 1397 error = ptrace_get_siginfo(t, ptm, addr, data); 1398 break; 1399 1400 case PT_RESUME: 1401 case PT_SUSPEND: 1402 error = ptrace_startstop(t, <, req, addr, data); 1403 break; 1404 1405 #ifdef PT_REGISTERS 1406 case_PT_SETREGS 1407 case_PT_GETREGS 1408 case_PT_SETFPREGS 1409 case_PT_GETFPREGS 1410 case_PT_SETDBREGS 1411 case_PT_GETDBREGS 1412 error = ptrace_regs(l, <, req, ptm, addr, data); 1413 break; 1414 #endif 1415 1416 #ifdef __HAVE_PTRACE_MACHDEP 1417 PTRACE_MACHDEP_REQUEST_CASES 1418 error = ptrace_machdep_dorequest(l, lt, req, addr, data); 1419 break; 1420 #endif 1421 } 1422 1423 out: 1424 if (pheld) { 1425 mutex_exit(t->p_lock); 1426 mutex_exit(proc_lock); 1427 } 1428 if (lt != NULL) 1429 lwp_delref(lt); 1430 if (locked) 1431 rw_exit(&t->p_reflock); 1432 1433 return error; 1434 } 1435 1436 typedef int (*regrfunc_t)(struct lwp *, void *, size_t *); 1437 typedef int (*regwfunc_t)(struct lwp *, void *, size_t); 1438 1439 #ifdef PT_REGISTERS 1440 static int 1441 proc_regio(struct lwp *l, struct uio *uio, size_t ks, regrfunc_t r, 1442 regwfunc_t w) 1443 { 1444 char buf[1024]; 1445 int error; 1446 char *kv; 1447 size_t kl; 1448 1449 if (ks > sizeof(buf)) 1450 return E2BIG; 1451 1452 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)ks) 1453 return EINVAL; 1454 1455 kv = buf + uio->uio_offset; 1456 kl = ks - uio->uio_offset; 1457 1458 if (kl > uio->uio_resid) 1459 kl = uio->uio_resid; 1460 1461 error = (*r)(l, buf, &ks); 1462 if (error == 0) 1463 error = uiomove(kv, kl, uio); 1464 if (error == 0 && uio->uio_rw == UIO_WRITE) { 1465 if (l->l_stat != LSSTOP) 1466 error = EBUSY; 1467 else 1468 error = (*w)(l, buf, ks); 1469 } 1470 1471 uio->uio_offset = 0; 1472 return error; 1473 } 1474 #endif 1475 1476 int 1477 process_doregs(struct lwp *curl /*tracer*/, 1478 struct lwp *l /*traced*/, 1479 struct uio *uio) 1480 { 1481 #if defined(PT_GETREGS) || defined(PT_SETREGS) 1482 size_t s; 1483 regrfunc_t r; 1484 regwfunc_t w; 1485 1486 #ifdef COMPAT_NETBSD32 1487 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1488 1489 if (__predict_false(pk32)) { 1490 if ((l->l_proc->p_flag & PK_32) == 0) { 1491 // 32 bit tracer can't trace 64 bit process 1492 return EINVAL; 1493 } 1494 s = sizeof(process_reg32); 1495 r = (regrfunc_t)process_read_regs32; 1496 w = (regwfunc_t)process_write_regs32; 1497 } else 1498 #endif 1499 { 1500 s = sizeof(struct reg); 1501 r = (regrfunc_t)process_read_regs; 1502 w = (regwfunc_t)process_write_regs; 1503 } 1504 return proc_regio(l, uio, s, r, w); 1505 #else 1506 return EINVAL; 1507 #endif 1508 } 1509 1510 int 1511 process_validregs(struct lwp *l) 1512 { 1513 1514 #if defined(PT_SETREGS) || defined(PT_GETREGS) 1515 return (l->l_flag & LW_SYSTEM) == 0; 1516 #else 1517 return 0; 1518 #endif 1519 } 1520 1521 int 1522 process_dofpregs(struct lwp *curl /*tracer*/, 1523 struct lwp *l /*traced*/, 1524 struct uio *uio) 1525 { 1526 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 1527 size_t s; 1528 regrfunc_t r; 1529 regwfunc_t w; 1530 1531 #ifdef COMPAT_NETBSD32 1532 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1533 1534 if (__predict_false(pk32)) { 1535 if ((l->l_proc->p_flag & PK_32) == 0) { 1536 // 32 bit tracer can't trace 64 bit process 1537 return EINVAL; 1538 } 1539 s = sizeof(process_fpreg32); 1540 r = (regrfunc_t)process_read_fpregs32; 1541 w = (regwfunc_t)process_write_fpregs32; 1542 } else 1543 #endif 1544 { 1545 s = sizeof(struct fpreg); 1546 r = (regrfunc_t)process_read_fpregs; 1547 w = (regwfunc_t)process_write_fpregs; 1548 } 1549 return proc_regio(l, uio, s, r, w); 1550 #else 1551 return EINVAL; 1552 #endif 1553 } 1554 1555 int 1556 process_validfpregs(struct lwp *l) 1557 { 1558 1559 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 1560 return (l->l_flag & LW_SYSTEM) == 0; 1561 #else 1562 return 0; 1563 #endif 1564 } 1565 1566 int 1567 process_dodbregs(struct lwp *curl /*tracer*/, 1568 struct lwp *l /*traced*/, 1569 struct uio *uio) 1570 { 1571 #if defined(PT_GETDBREGS) || defined(PT_SETDBREGS) 1572 size_t s; 1573 regrfunc_t r; 1574 regwfunc_t w; 1575 1576 #ifdef COMPAT_NETBSD32 1577 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1578 1579 if (__predict_false(pk32)) { 1580 if ((l->l_proc->p_flag & PK_32) == 0) { 1581 // 32 bit tracer can't trace 64 bit process 1582 return EINVAL; 1583 } 1584 s = sizeof(process_dbreg32); 1585 r = (regrfunc_t)process_read_dbregs32; 1586 w = (regwfunc_t)process_write_dbregs32; 1587 } else 1588 #endif 1589 { 1590 s = sizeof(struct dbreg); 1591 r = (regrfunc_t)process_read_dbregs; 1592 w = (regwfunc_t)process_write_dbregs; 1593 } 1594 return proc_regio(l, uio, s, r, w); 1595 #else 1596 return EINVAL; 1597 #endif 1598 } 1599 1600 int 1601 process_validdbregs(struct lwp *l) 1602 { 1603 1604 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 1605 return (l->l_flag & LW_SYSTEM) == 0; 1606 #else 1607 return 0; 1608 #endif 1609 } 1610 1611 static int 1612 process_auxv_offset(struct proc *p, struct uio *uio) 1613 { 1614 struct ps_strings pss; 1615 int error; 1616 off_t off = (off_t)p->p_psstrp; 1617 1618 if ((error = copyin_psstrings(p, &pss)) != 0) 1619 return error; 1620 1621 if (pss.ps_envstr == NULL) 1622 return EIO; 1623 1624 uio->uio_offset += (off_t)(vaddr_t)(pss.ps_envstr + pss.ps_nenvstr + 1); 1625 #ifdef __MACHINE_STACK_GROWS_UP 1626 if (uio->uio_offset < off) 1627 return EIO; 1628 #else 1629 if (uio->uio_offset > off) 1630 return EIO; 1631 if ((uio->uio_offset + uio->uio_resid) > off) 1632 uio->uio_resid = off - uio->uio_offset; 1633 #endif 1634 return 0; 1635 } 1636 #endif /* PTRACE */ 1637 1638 MODULE(MODULE_CLASS_EXEC, ptrace_common, NULL); 1639 1640 static int 1641 ptrace_common_modcmd(modcmd_t cmd, void *arg) 1642 { 1643 int error; 1644 1645 switch (cmd) { 1646 case MODULE_CMD_INIT: 1647 error = ptrace_init(); 1648 break; 1649 case MODULE_CMD_FINI: 1650 error = ptrace_fini(); 1651 break; 1652 default: 1653 ptrace_hooks(); 1654 error = ENOTTY; 1655 break; 1656 } 1657 return error; 1658 } 1659
Indexes created Tue Sep 30 20:09:53 GMT 2025