sys_ptrace_common.c revision 1.58.2.5
1 /* $NetBSD: sys_ptrace_common.c,v 1.58.2.5 2019/10/15 19:01:06 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 1.58.2.5 2019/10/15 19:01:06 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) == sizeof(ps.pe_lwp)); 708 ps.pe_other_pid = 709 si->_reason._ptrace_state._option._pe_other_pid; 710 } 711 712 DPRINTF(("%s: lwp=%d event=%#x pid=%d lwp=%d\n", __func__, 713 t->p_sigctx.ps_lwp, ps.pe_report_event, 714 ps.pe_other_pid, ps.pe_lwp)); 715 return copyout(&ps, addr, sizeof(ps)); 716 } 717 718 static int 719 ptrace_lwpinfo(struct proc *t, struct lwp **lt, void *addr, size_t data) 720 { 721 struct ptrace_lwpinfo pl; 722 723 if (data != sizeof(pl)) { 724 DPRINTF(("%s: %zu != %zu\n", __func__, data, sizeof(pl))); 725 return EINVAL; 726 } 727 int error = copyin(addr, &pl, sizeof(pl)); 728 if (error) 729 return error; 730 731 lwpid_t tmp = pl.pl_lwpid; 732 lwp_delref(*lt); 733 mutex_enter(t->p_lock); 734 if (tmp == 0) 735 *lt = lwp_find_first(t); 736 else { 737 *lt = lwp_find(t, tmp); 738 if (*lt == NULL) { 739 mutex_exit(t->p_lock); 740 return ESRCH; 741 } 742 *lt = LIST_NEXT(*lt, l_sibling); 743 } 744 745 while (*lt != NULL && !lwp_alive(*lt)) 746 *lt = LIST_NEXT(*lt, l_sibling); 747 748 pl.pl_lwpid = 0; 749 pl.pl_event = 0; 750 if (*lt) { 751 lwp_addref(*lt); 752 pl.pl_lwpid = (*lt)->l_lid; 753 754 if ((*lt)->l_flag & LW_WSUSPEND) 755 pl.pl_event = PL_EVENT_SUSPENDED; 756 /* 757 * If we match the lwp, or it was sent to every lwp, 758 * we set PL_EVENT_SIGNAL. 759 * XXX: ps_lwp == 0 means everyone and noone, so 760 * check ps_signo too. 761 */ 762 else if ((*lt)->l_lid == t->p_sigctx.ps_lwp 763 || (t->p_sigctx.ps_lwp == 0 && 764 t->p_sigctx.ps_info._signo)) { 765 DPRINTF(("%s: lwp=%d siglwp=%d signo %d\n", __func__, 766 pl.pl_lwpid, t->p_sigctx.ps_lwp, 767 t->p_sigctx.ps_info._signo)); 768 pl.pl_event = PL_EVENT_SIGNAL; 769 } 770 } 771 mutex_exit(t->p_lock); 772 DPRINTF(("%s: lwp=%d event=%#x\n", __func__, 773 pl.pl_lwpid, pl.pl_event)); 774 775 return copyout(&pl, addr, sizeof(pl)); 776 } 777 778 static int 779 ptrace_startstop(struct proc *t, struct lwp **lt, int rq, void *addr, 780 size_t data) 781 { 782 int error; 783 784 if ((error = ptrace_update_lwp(t, lt, data)) != 0) 785 return error; 786 787 DPRINTF(("%s: lwp=%d request=%d\n", __func__, (*lt)->l_lid, rq)); 788 lwp_lock(*lt); 789 if (rq == PT_SUSPEND) 790 (*lt)->l_flag |= LW_DBGSUSPEND; 791 else { 792 (*lt)->l_flag &= ~LW_DBGSUSPEND; 793 if ((*lt)->l_flag != LSSUSPENDED) 794 (*lt)->l_stat = LSSTOP; 795 } 796 lwp_unlock(*lt); 797 return 0; 798 } 799 800 #ifdef PT_REGISTERS 801 static int 802 ptrace_uio_dir(int req) 803 { 804 switch (req) { 805 case_PT_GETREGS 806 case_PT_GETFPREGS 807 case_PT_GETDBREGS 808 return UIO_READ; 809 case_PT_SETREGS 810 case_PT_SETFPREGS 811 case_PT_SETDBREGS 812 return UIO_WRITE; 813 default: 814 return -1; 815 } 816 } 817 818 static int 819 ptrace_regs(struct lwp *l, struct lwp **lt, int rq, struct ptrace_methods *ptm, 820 void *addr, size_t data) 821 { 822 int error; 823 struct proc *t = (*lt)->l_proc; 824 struct vmspace *vm; 825 826 if ((error = ptrace_update_lwp(t, lt, data)) != 0) 827 return error; 828 829 int dir = ptrace_uio_dir(rq); 830 size_t size; 831 int (*func)(struct lwp *, struct lwp *, struct uio *); 832 833 DPRINTF(("%s: lwp=%d request=%d\n", __func__, l->l_lid, rq)); 834 835 switch (rq) { 836 #if defined(PT_SETREGS) || defined(PT_GETREGS) 837 case_PT_GETREGS 838 case_PT_SETREGS 839 if (!process_validregs(*lt)) 840 return EINVAL; 841 size = PROC_REGSZ(t); 842 func = ptm->ptm_doregs; 843 break; 844 #endif 845 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 846 case_PT_GETFPREGS 847 case_PT_SETFPREGS 848 if (!process_validfpregs(*lt)) 849 return EINVAL; 850 size = PROC_FPREGSZ(t); 851 func = ptm->ptm_dofpregs; 852 break; 853 #endif 854 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 855 case_PT_GETDBREGS 856 case_PT_SETDBREGS 857 if (!process_validdbregs(*lt)) 858 return EINVAL; 859 size = PROC_DBREGSZ(t); 860 func = ptm->ptm_dodbregs; 861 break; 862 #endif 863 default: 864 return EINVAL; 865 } 866 867 error = proc_vmspace_getref(l->l_proc, &vm); 868 if (error) 869 return error; 870 871 struct uio uio; 872 struct iovec iov; 873 874 iov.iov_base = addr; 875 iov.iov_len = size; 876 uio.uio_iov = &iov; 877 uio.uio_iovcnt = 1; 878 uio.uio_offset = 0; 879 uio.uio_resid = iov.iov_len; 880 uio.uio_rw = dir; 881 uio.uio_vmspace = vm; 882 883 error = (*func)(l, *lt, &uio); 884 uvmspace_free(vm); 885 return error; 886 } 887 #endif 888 889 static int 890 ptrace_sendsig(struct proc *t, struct lwp *lt, int signo, int resume_all) 891 { 892 ksiginfo_t ksi; 893 894 /* Finally, deliver the requested signal (or none). */ 895 if (t->p_stat == SSTOP) { 896 /* 897 * Unstop the process. If it needs to take a 898 * signal, make all efforts to ensure that at 899 * an LWP runs to see it. 900 */ 901 t->p_xsig = signo; 902 903 /* 904 * signo > 0 check prevents a potential panic, as 905 * sigismember(&...,0) is invalid check and signo 906 * can be equal to 0 as a special case of no-signal. 907 */ 908 if (signo > 0 && sigismember(&stopsigmask, signo)) { 909 t->p_waited = 0; 910 child_psignal(t, 0); 911 } else if (resume_all) 912 proc_unstop(t); 913 else 914 lwp_unstop(lt); 915 return 0; 916 } 917 918 KSI_INIT_EMPTY(&ksi); 919 if (t->p_sigctx.ps_faked) { 920 if (signo != t->p_sigctx.ps_info._signo) 921 return EINVAL; 922 t->p_sigctx.ps_faked = false; 923 ksi.ksi_info = t->p_sigctx.ps_info; 924 ksi.ksi_lid = t->p_sigctx.ps_lwp; 925 } else if (signo == 0) { 926 return 0; 927 } else { 928 ksi.ksi_signo = signo; 929 } 930 DPRINTF(("%s: pid=%d.%d signal=%d resume_all=%d\n", __func__, t->p_pid, 931 t->p_sigctx.ps_lwp, signo, resume_all)); 932 933 kpsignal2(t, &ksi); 934 return 0; 935 } 936 937 static int 938 ptrace_dumpcore(struct lwp *lt, char *path, size_t len) 939 { 940 int error; 941 if (path != NULL) { 942 943 if (len >= MAXPATHLEN) 944 return EINVAL; 945 946 char *src = path; 947 path = kmem_alloc(len + 1, KM_SLEEP); 948 error = copyin(src, path, len); 949 if (error) 950 goto out; 951 path[len] = '\0'; 952 } 953 DPRINTF(("%s: lwp=%d\n", __func__, lt->l_lid)); 954 error = (*coredump_vec)(lt, path); 955 out: 956 if (path) 957 kmem_free(path, len + 1); 958 return error; 959 } 960 961 static int 962 ptrace_doio(struct lwp *l, struct proc *t, struct lwp *lt, 963 struct ptrace_io_desc *piod, void *addr, bool sysspace) 964 { 965 struct uio uio; 966 struct iovec iov; 967 int error, tmp; 968 969 error = 0; 970 iov.iov_base = piod->piod_addr; 971 iov.iov_len = piod->piod_len; 972 uio.uio_iov = &iov; 973 uio.uio_iovcnt = 1; 974 uio.uio_offset = (off_t)(unsigned long)piod->piod_offs; 975 uio.uio_resid = piod->piod_len; 976 977 DPRINTF(("%s: lwp=%d request=%d\n", __func__, l->l_lid, piod->piod_op)); 978 979 switch (piod->piod_op) { 980 case PIOD_READ_D: 981 case PIOD_READ_I: 982 uio.uio_rw = UIO_READ; 983 break; 984 case PIOD_WRITE_D: 985 case PIOD_WRITE_I: 986 /* 987 * Can't write to a RAS 988 */ 989 if (ras_lookup(t, addr) != (void *)-1) { 990 return EACCES; 991 } 992 uio.uio_rw = UIO_WRITE; 993 break; 994 case PIOD_READ_AUXV: 995 uio.uio_rw = UIO_READ; 996 tmp = t->p_execsw->es_arglen; 997 if (uio.uio_offset > tmp) 998 return EIO; 999 if (uio.uio_resid > tmp - uio.uio_offset) 1000 uio.uio_resid = tmp - uio.uio_offset; 1001 piod->piod_len = iov.iov_len = uio.uio_resid; 1002 error = process_auxv_offset(t, &uio); 1003 break; 1004 default: 1005 error = EINVAL; 1006 break; 1007 } 1008 1009 if (error) 1010 return error; 1011 1012 if (sysspace) { 1013 uio.uio_vmspace = vmspace_kernel(); 1014 } else { 1015 error = proc_vmspace_getref(l->l_proc, &uio.uio_vmspace); 1016 if (error) 1017 return error; 1018 } 1019 1020 error = process_domem(l, lt, &uio); 1021 if (!sysspace) 1022 uvmspace_free(uio.uio_vmspace); 1023 if (error) 1024 return error; 1025 piod->piod_len -= uio.uio_resid; 1026 return 0; 1027 } 1028 1029 int 1030 do_ptrace(struct ptrace_methods *ptm, struct lwp *l, int req, pid_t pid, 1031 void *addr, int data, register_t *retval) 1032 { 1033 struct proc *p = l->l_proc; 1034 struct lwp *lt = NULL; 1035 struct lwp *lt2; 1036 struct proc *t; /* target process */ 1037 struct ptrace_io_desc piod; 1038 int error, write, tmp, pheld; 1039 int signo = 0; 1040 int resume_all; 1041 bool locked; 1042 error = 0; 1043 1044 /* 1045 * If attaching or detaching, we need to get a write hold on the 1046 * proclist lock so that we can re-parent the target process. 1047 */ 1048 mutex_enter(proc_lock); 1049 1050 t = ptrace_find(l, req, pid); 1051 if (t == NULL) { 1052 mutex_exit(proc_lock); 1053 return ESRCH; 1054 } 1055 1056 pheld = 1; 1057 if ((error = ptrace_allowed(l, req, t, p, &locked)) != 0) 1058 goto out; 1059 1060 if ((error = kauth_authorize_process(l->l_cred, 1061 KAUTH_PROCESS_PTRACE, t, KAUTH_ARG(req), NULL, NULL)) != 0) 1062 goto out; 1063 1064 if ((lt = lwp_find_first(t)) == NULL) { 1065 error = ESRCH; 1066 goto out; 1067 } 1068 1069 /* Do single-step fixup if needed. */ 1070 FIX_SSTEP(t); 1071 KASSERT(lt != NULL); 1072 lwp_addref(lt); 1073 1074 /* 1075 * Which locks do we need held? XXX Ugly. 1076 */ 1077 if ((pheld = ptrace_needs_hold(req)) == 0) { 1078 mutex_exit(t->p_lock); 1079 mutex_exit(proc_lock); 1080 } 1081 1082 /* Now do the operation. */ 1083 write = 0; 1084 *retval = 0; 1085 tmp = 0; 1086 resume_all = 1; 1087 1088 switch (req) { 1089 case PT_TRACE_ME: 1090 /* Just set the trace flag. */ 1091 SET(t->p_slflag, PSL_TRACED); 1092 t->p_opptr = t->p_pptr; 1093 break; 1094 1095 /* 1096 * The I and D separate address space has been inherited from PDP-11. 1097 * The 16-bit UNIX started with a single address space per program, 1098 * but was extended to two 16-bit (2 x 64kb) address spaces. 1099 * 1100 * We no longer maintain this feature in maintained architectures, but 1101 * we keep the API for backward compatiblity. Currently the I and D 1102 * operations are exactly the same and not distinguished in debuggers. 1103 */ 1104 case PT_WRITE_I: 1105 case PT_WRITE_D: 1106 write = 1; 1107 tmp = data; 1108 /* FALLTHROUGH */ 1109 case PT_READ_I: 1110 case PT_READ_D: 1111 piod.piod_addr = &tmp; 1112 piod.piod_len = sizeof(tmp); 1113 piod.piod_offs = addr; 1114 piod.piod_op = write ? PIOD_WRITE_D : PIOD_READ_D; 1115 if ((error = ptrace_doio(l, t, lt, &piod, addr, true)) != 0) 1116 break; 1117 /* 1118 * For legacy reasons we treat here two results as success: 1119 * - incomplete transfer piod.piod_len < sizeof(tmp) 1120 * - no transfer piod.piod_len == 0 1121 * 1122 * This means that there is no way to determine whether 1123 * transfer operation was performed in PT_WRITE and PT_READ 1124 * calls. 1125 */ 1126 if (!write) 1127 *retval = tmp; 1128 break; 1129 1130 case PT_IO: 1131 if ((error = ptm->ptm_copyin_piod(&piod, addr, data)) != 0) 1132 break; 1133 if (piod.piod_len < 1) { 1134 error = EINVAL; 1135 break; 1136 } 1137 if ((error = ptrace_doio(l, t, lt, &piod, addr, false)) != 0) 1138 break; 1139 /* 1140 * For legacy reasons we treat here two results as success: 1141 * - incomplete transfer piod.piod_len < sizeof(tmp) 1142 * - no transfer piod.piod_len == 0 1143 */ 1144 error = ptm->ptm_copyout_piod(&piod, addr, data); 1145 break; 1146 1147 case PT_DUMPCORE: 1148 error = ptrace_dumpcore(lt, addr, data); 1149 break; 1150 1151 #ifdef PT_STEP 1152 case PT_STEP: 1153 /* 1154 * From the 4.4BSD PRM: 1155 * "Execution continues as in request PT_CONTINUE; however 1156 * as soon as possible after execution of at least one 1157 * instruction, execution stops again. [ ... ]" 1158 */ 1159 #endif 1160 case PT_CONTINUE: 1161 case PT_SYSCALL: 1162 case PT_DETACH: 1163 if (req == PT_SYSCALL) { 1164 if (!ISSET(t->p_slflag, PSL_SYSCALL)) { 1165 SET(t->p_slflag, PSL_SYSCALL); 1166 #ifdef __HAVE_SYSCALL_INTERN 1167 (*t->p_emul->e_syscall_intern)(t); 1168 #endif 1169 } 1170 } else { 1171 if (ISSET(t->p_slflag, PSL_SYSCALL)) { 1172 CLR(t->p_slflag, PSL_SYSCALL); 1173 #ifdef __HAVE_SYSCALL_INTERN 1174 (*t->p_emul->e_syscall_intern)(t); 1175 #endif 1176 } 1177 } 1178 t->p_trace_enabled = trace_is_enabled(t); 1179 1180 /* 1181 * Pick up the LWPID, if supplied. There are two cases: 1182 * data < 0 : step or continue single thread, lwp = -data 1183 * data > 0 in PT_STEP : step this thread, continue others 1184 * For operations other than PT_STEP, data > 0 means 1185 * data is the signo to deliver to the process. 1186 */ 1187 tmp = data; 1188 if (tmp >= 0) { 1189 #ifdef PT_STEP 1190 if (req == PT_STEP) 1191 signo = 0; 1192 else 1193 #endif 1194 { 1195 signo = tmp; 1196 tmp = 0; /* don't search for LWP */ 1197 } 1198 } else if (tmp == INT_MIN) { 1199 error = ESRCH; 1200 break; 1201 } else { 1202 tmp = -tmp; 1203 } 1204 1205 if (tmp > 0) { 1206 if (req == PT_DETACH) { 1207 error = EINVAL; 1208 break; 1209 } 1210 lwp_delref2 (lt); 1211 lt = lwp_find(t, tmp); 1212 if (lt == NULL) { 1213 error = ESRCH; 1214 break; 1215 } 1216 lwp_addref(lt); 1217 resume_all = 0; 1218 signo = 0; 1219 } 1220 1221 /* 1222 * From the 4.4BSD PRM: 1223 * "The data argument is taken as a signal number and the 1224 * child's execution continues at location addr as if it 1225 * incurred that signal. Normally the signal number will 1226 * be either 0 to indicate that the signal that caused the 1227 * stop should be ignored, or that value fetched out of 1228 * the process's image indicating which signal caused 1229 * the stop. If addr is (int *)1 then execution continues 1230 * from where it stopped." 1231 */ 1232 1233 /* Check that the data is a valid signal number or zero. */ 1234 if (signo < 0 || signo >= NSIG) { 1235 error = EINVAL; 1236 break; 1237 } 1238 1239 /* Prevent process deadlock */ 1240 if (resume_all) { 1241 #ifdef PT_STEP 1242 if (req == PT_STEP) { 1243 if (lt->l_flag & 1244 (LW_WSUSPEND | LW_DBGSUSPEND)) { 1245 error = EDEADLK; 1246 break; 1247 } 1248 } else 1249 #endif 1250 { 1251 error = EDEADLK; 1252 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1253 if ((lt2->l_flag & 1254 (LW_WSUSPEND | LW_DBGSUSPEND)) == 0 1255 ) { 1256 error = 0; 1257 break; 1258 } 1259 } 1260 if (error != 0) 1261 break; 1262 } 1263 } else { 1264 if (lt->l_flag & (LW_WSUSPEND | LW_WSUSPEND)) { 1265 error = EDEADLK; 1266 break; 1267 } 1268 } 1269 1270 /* 1271 * Reject setting program cunter to 0x0 if VA0 is disabled. 1272 * 1273 * Not all kernels implement this feature to set Program 1274 * Counter in one go in PT_CONTINUE and similar operations. 1275 * This causes portability issues as passing address 0x0 1276 * on these kernels is no-operation, but can cause failure 1277 * in most cases on NetBSD. 1278 */ 1279 if (user_va0_disable && addr == 0) { 1280 error = EINVAL; 1281 break; 1282 } 1283 1284 /* If the address parameter is not (int *)1, set the pc. */ 1285 if ((int *)addr != (int *)1) { 1286 error = process_set_pc(lt, addr); 1287 if (error != 0) 1288 break; 1289 } 1290 #ifdef PT_STEP 1291 /* 1292 * Arrange for a single-step, if that's requested and possible. 1293 * More precisely, set the single step status as requested for 1294 * the requested thread, and clear it for other threads. 1295 */ 1296 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1297 if (ISSET(lt2->l_pflag, LP_SINGLESTEP)) { 1298 lwp_lock(lt2); 1299 process_sstep(lt2, 1); 1300 lwp_unlock(lt2); 1301 } else if (lt != lt2) { 1302 lwp_lock(lt2); 1303 process_sstep(lt2, 0); 1304 lwp_unlock(lt2); 1305 } 1306 } 1307 error = process_sstep(lt, 1308 ISSET(lt->l_pflag, LP_SINGLESTEP) || req == PT_STEP); 1309 if (error) 1310 break; 1311 #endif 1312 if (req == PT_DETACH) { 1313 CLR(t->p_slflag, PSL_TRACED|PSL_SYSCALL); 1314 1315 /* give process back to original parent or init */ 1316 if (t->p_opptr != t->p_pptr) { 1317 struct proc *pp = t->p_opptr; 1318 proc_reparent(t, pp ? pp : initproc); 1319 } 1320 1321 /* not being traced any more */ 1322 t->p_opptr = NULL; 1323 1324 /* clear single step */ 1325 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 1326 CLR(lt2->l_pflag, LP_SINGLESTEP); 1327 } 1328 CLR(lt->l_pflag, LP_SINGLESTEP); 1329 } 1330 sendsig: 1331 error = ptrace_sendsig(t, lt, signo, resume_all); 1332 break; 1333 1334 case PT_SYSCALLEMU: 1335 if (!ISSET(t->p_slflag, PSL_SYSCALL) || t->p_stat != SSTOP) { 1336 error = EINVAL; 1337 break; 1338 } 1339 SET(t->p_slflag, PSL_SYSCALLEMU); 1340 break; 1341 1342 #ifdef PT_STEP 1343 case PT_SETSTEP: 1344 write = 1; 1345 1346 /* FALLTHROUGH */ 1347 case PT_CLEARSTEP: 1348 /* write = 0 done above. */ 1349 if ((error = ptrace_update_lwp(t, <, data)) != 0) 1350 break; 1351 1352 if (write) 1353 SET(lt->l_pflag, LP_SINGLESTEP); 1354 else 1355 CLR(lt->l_pflag, LP_SINGLESTEP); 1356 break; 1357 #endif 1358 1359 case PT_KILL: 1360 /* just send the process a KILL signal. */ 1361 signo = SIGKILL; 1362 goto sendsig; /* in PT_CONTINUE, above. */ 1363 1364 case PT_ATTACH: 1365 /* 1366 * Go ahead and set the trace flag. 1367 * Save the old parent (it's reset in 1368 * _DETACH, and also in kern_exit.c:wait4() 1369 * Reparent the process so that the tracing 1370 * proc gets to see all the action. 1371 * Stop the target. 1372 */ 1373 proc_changeparent(t, p); 1374 signo = SIGSTOP; 1375 goto sendsig; 1376 1377 case PT_GET_EVENT_MASK: 1378 error = ptrace_get_event_mask(t, addr, data); 1379 break; 1380 1381 case PT_SET_EVENT_MASK: 1382 error = ptrace_set_event_mask(t, addr, data); 1383 break; 1384 1385 case PT_GET_PROCESS_STATE: 1386 error = ptrace_get_process_state(t, addr, data); 1387 break; 1388 1389 case PT_LWPINFO: 1390 error = ptrace_lwpinfo(t, <, addr, data); 1391 break; 1392 1393 case PT_SET_SIGINFO: 1394 error = ptrace_set_siginfo(t, <, ptm, addr, data); 1395 break; 1396 1397 case PT_GET_SIGINFO: 1398 error = ptrace_get_siginfo(t, ptm, addr, data); 1399 break; 1400 1401 case PT_RESUME: 1402 case PT_SUSPEND: 1403 error = ptrace_startstop(t, <, req, addr, data); 1404 break; 1405 1406 #ifdef PT_REGISTERS 1407 case_PT_SETREGS 1408 case_PT_GETREGS 1409 case_PT_SETFPREGS 1410 case_PT_GETFPREGS 1411 case_PT_SETDBREGS 1412 case_PT_GETDBREGS 1413 error = ptrace_regs(l, <, req, ptm, addr, data); 1414 break; 1415 #endif 1416 1417 #ifdef __HAVE_PTRACE_MACHDEP 1418 PTRACE_MACHDEP_REQUEST_CASES 1419 error = ptrace_machdep_dorequest(l, lt, req, addr, data); 1420 break; 1421 #endif 1422 } 1423 1424 out: 1425 if (pheld) { 1426 mutex_exit(t->p_lock); 1427 mutex_exit(proc_lock); 1428 } 1429 if (lt != NULL) 1430 lwp_delref(lt); 1431 if (locked) 1432 rw_exit(&t->p_reflock); 1433 1434 return error; 1435 } 1436 1437 typedef int (*regrfunc_t)(struct lwp *, void *, size_t *); 1438 typedef int (*regwfunc_t)(struct lwp *, void *, size_t); 1439 1440 #ifdef PT_REGISTERS 1441 static int 1442 proc_regio(struct lwp *l, struct uio *uio, size_t ks, regrfunc_t r, 1443 regwfunc_t w) 1444 { 1445 char buf[1024]; 1446 int error; 1447 char *kv; 1448 size_t kl; 1449 1450 if (ks > sizeof(buf)) 1451 return E2BIG; 1452 1453 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)ks) 1454 return EINVAL; 1455 1456 kv = buf + uio->uio_offset; 1457 kl = ks - uio->uio_offset; 1458 1459 if (kl > uio->uio_resid) 1460 kl = uio->uio_resid; 1461 1462 error = (*r)(l, buf, &ks); 1463 if (error == 0) 1464 error = uiomove(kv, kl, uio); 1465 if (error == 0 && uio->uio_rw == UIO_WRITE) { 1466 if (l->l_stat != LSSTOP) 1467 error = EBUSY; 1468 else 1469 error = (*w)(l, buf, ks); 1470 } 1471 1472 uio->uio_offset = 0; 1473 return error; 1474 } 1475 #endif 1476 1477 int 1478 process_doregs(struct lwp *curl /*tracer*/, 1479 struct lwp *l /*traced*/, 1480 struct uio *uio) 1481 { 1482 #if defined(PT_GETREGS) || defined(PT_SETREGS) 1483 size_t s; 1484 regrfunc_t r; 1485 regwfunc_t w; 1486 1487 #ifdef COMPAT_NETBSD32 1488 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1489 1490 if (__predict_false(pk32)) { 1491 if ((l->l_proc->p_flag & PK_32) == 0) { 1492 // 32 bit tracer can't trace 64 bit process 1493 return EINVAL; 1494 } 1495 s = sizeof(process_reg32); 1496 r = (regrfunc_t)process_read_regs32; 1497 w = (regwfunc_t)process_write_regs32; 1498 } else 1499 #endif 1500 { 1501 s = sizeof(struct reg); 1502 r = (regrfunc_t)process_read_regs; 1503 w = (regwfunc_t)process_write_regs; 1504 } 1505 return proc_regio(l, uio, s, r, w); 1506 #else 1507 return EINVAL; 1508 #endif 1509 } 1510 1511 int 1512 process_validregs(struct lwp *l) 1513 { 1514 1515 #if defined(PT_SETREGS) || defined(PT_GETREGS) 1516 return (l->l_flag & LW_SYSTEM) == 0; 1517 #else 1518 return 0; 1519 #endif 1520 } 1521 1522 int 1523 process_dofpregs(struct lwp *curl /*tracer*/, 1524 struct lwp *l /*traced*/, 1525 struct uio *uio) 1526 { 1527 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 1528 size_t s; 1529 regrfunc_t r; 1530 regwfunc_t w; 1531 1532 #ifdef COMPAT_NETBSD32 1533 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1534 1535 if (__predict_false(pk32)) { 1536 if ((l->l_proc->p_flag & PK_32) == 0) { 1537 // 32 bit tracer can't trace 64 bit process 1538 return EINVAL; 1539 } 1540 s = sizeof(process_fpreg32); 1541 r = (regrfunc_t)process_read_fpregs32; 1542 w = (regwfunc_t)process_write_fpregs32; 1543 } else 1544 #endif 1545 { 1546 s = sizeof(struct fpreg); 1547 r = (regrfunc_t)process_read_fpregs; 1548 w = (regwfunc_t)process_write_fpregs; 1549 } 1550 return proc_regio(l, uio, s, r, w); 1551 #else 1552 return EINVAL; 1553 #endif 1554 } 1555 1556 int 1557 process_validfpregs(struct lwp *l) 1558 { 1559 1560 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 1561 return (l->l_flag & LW_SYSTEM) == 0; 1562 #else 1563 return 0; 1564 #endif 1565 } 1566 1567 int 1568 process_dodbregs(struct lwp *curl /*tracer*/, 1569 struct lwp *l /*traced*/, 1570 struct uio *uio) 1571 { 1572 #if defined(PT_GETDBREGS) || defined(PT_SETDBREGS) 1573 size_t s; 1574 regrfunc_t r; 1575 regwfunc_t w; 1576 1577 #ifdef COMPAT_NETBSD32 1578 const bool pk32 = (curl->l_proc->p_flag & PK_32) != 0; 1579 1580 if (__predict_false(pk32)) { 1581 if ((l->l_proc->p_flag & PK_32) == 0) { 1582 // 32 bit tracer can't trace 64 bit process 1583 return EINVAL; 1584 } 1585 s = sizeof(process_dbreg32); 1586 r = (regrfunc_t)process_read_dbregs32; 1587 w = (regwfunc_t)process_write_dbregs32; 1588 } else 1589 #endif 1590 { 1591 s = sizeof(struct dbreg); 1592 r = (regrfunc_t)process_read_dbregs; 1593 w = (regwfunc_t)process_write_dbregs; 1594 } 1595 return proc_regio(l, uio, s, r, w); 1596 #else 1597 return EINVAL; 1598 #endif 1599 } 1600 1601 int 1602 process_validdbregs(struct lwp *l) 1603 { 1604 1605 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 1606 return (l->l_flag & LW_SYSTEM) == 0; 1607 #else 1608 return 0; 1609 #endif 1610 } 1611 1612 static int 1613 process_auxv_offset(struct proc *p, struct uio *uio) 1614 { 1615 struct ps_strings pss; 1616 int error; 1617 off_t off = (off_t)p->p_psstrp; 1618 1619 if ((error = copyin_psstrings(p, &pss)) != 0) 1620 return error; 1621 1622 if (pss.ps_envstr == NULL) 1623 return EIO; 1624 1625 uio->uio_offset += (off_t)(vaddr_t)(pss.ps_envstr + pss.ps_nenvstr + 1); 1626 #ifdef __MACHINE_STACK_GROWS_UP 1627 if (uio->uio_offset < off) 1628 return EIO; 1629 #else 1630 if (uio->uio_offset > off) 1631 return EIO; 1632 if ((uio->uio_offset + uio->uio_resid) > off) 1633 uio->uio_resid = off - uio->uio_offset; 1634 #endif 1635 return 0; 1636 } 1637 #endif /* PTRACE */ 1638 1639 MODULE(MODULE_CLASS_EXEC, ptrace_common, NULL); 1640 1641 static int 1642 ptrace_common_modcmd(modcmd_t cmd, void *arg) 1643 { 1644 int error; 1645 1646 switch (cmd) { 1647 case MODULE_CMD_INIT: 1648 error = ptrace_init(); 1649 break; 1650 case MODULE_CMD_FINI: 1651 error = ptrace_fini(); 1652 break; 1653 default: 1654 ptrace_hooks(); 1655 error = ENOTTY; 1656 break; 1657 } 1658 return error; 1659 } 1660
Indexes created Tue Sep 30 20:09:53 GMT 2025