sys_ptrace_common.c revision 1.22.2.1
1 /* $NetBSD: sys_ptrace_common.c,v 1.22.2.1 2018/03/06 09:52:09 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 1.22.2.1 2018/03/06 09:52:09 martin Exp $"); 122 123 #ifdef _KERNEL_OPT 124 #include "opt_ptrace.h" 125 #include "opt_ktrace.h" 126 #include "opt_pax.h" 127 #endif 128 129 #include <sys/param.h> 130 #include <sys/systm.h> 131 #include <sys/proc.h> 132 #include <sys/errno.h> 133 #include <sys/exec.h> 134 #include <sys/pax.h> 135 #include <sys/ptrace.h> 136 #include <sys/uio.h> 137 #include <sys/ras.h> 138 #include <sys/kmem.h> 139 #include <sys/kauth.h> 140 #include <sys/mount.h> 141 #include <sys/syscallargs.h> 142 #include <sys/module.h> 143 #include <sys/condvar.h> 144 #include <sys/mutex.h> 145 146 #include <uvm/uvm_extern.h> 147 148 #include <machine/reg.h> 149 150 #ifdef PTRACE 151 152 # ifdef DEBUG 153 # define DPRINTF(a) uprintf a 154 # else 155 # define DPRINTF(a) 156 # endif 157 158 static kauth_listener_t ptrace_listener; 159 static int process_auxv_offset(struct proc *, struct uio *); 160 161 #if 0 162 static int ptrace_cbref; 163 static kmutex_t ptrace_mtx; 164 static kcondvar_t ptrace_cv; 165 #endif 166 167 static int 168 ptrace_listener_cb(kauth_cred_t cred, kauth_action_t action, void *cookie, 169 void *arg0, void *arg1, void *arg2, void *arg3) 170 { 171 struct proc *p; 172 int result; 173 174 result = KAUTH_RESULT_DEFER; 175 p = arg0; 176 177 #if 0 178 mutex_enter(&ptrace_mtx); 179 ptrace_cbref++; 180 mutex_exit(&ptrace_mtx); 181 #endif 182 if (action != KAUTH_PROCESS_PTRACE) 183 goto out; 184 185 switch ((u_long)arg1) { 186 case PT_TRACE_ME: 187 case PT_ATTACH: 188 case PT_WRITE_I: 189 case PT_WRITE_D: 190 case PT_READ_I: 191 case PT_READ_D: 192 case PT_IO: 193 #ifdef PT_GETREGS 194 case PT_GETREGS: 195 #endif 196 #ifdef PT_SETREGS 197 case PT_SETREGS: 198 #endif 199 #ifdef PT_GETFPREGS 200 case PT_GETFPREGS: 201 #endif 202 #ifdef PT_SETFPREGS 203 case PT_SETFPREGS: 204 #endif 205 #ifdef PT_GETDBREGS 206 case PT_GETDBREGS: 207 #endif 208 #ifdef PT_SETDBREGS 209 case PT_SETDBREGS: 210 #endif 211 case PT_SET_EVENT_MASK: 212 case PT_GET_EVENT_MASK: 213 case PT_GET_PROCESS_STATE: 214 case PT_SET_SIGINFO: 215 case PT_GET_SIGINFO: 216 #ifdef __HAVE_PTRACE_MACHDEP 217 PTRACE_MACHDEP_REQUEST_CASES 218 #endif 219 if (kauth_cred_getuid(cred) != kauth_cred_getuid(p->p_cred) || 220 ISSET(p->p_flag, PK_SUGID)) { 221 break; 222 } 223 224 result = KAUTH_RESULT_ALLOW; 225 226 break; 227 228 #ifdef PT_STEP 229 case PT_STEP: 230 case PT_SETSTEP: 231 case PT_CLEARSTEP: 232 #endif 233 case PT_CONTINUE: 234 case PT_KILL: 235 case PT_DETACH: 236 case PT_LWPINFO: 237 case PT_SYSCALL: 238 case PT_SYSCALLEMU: 239 case PT_DUMPCORE: 240 case PT_RESUME: 241 case PT_SUSPEND: 242 result = KAUTH_RESULT_ALLOW; 243 break; 244 245 default: 246 break; 247 } 248 249 out: 250 #if 0 251 mutex_enter(&ptrace_mtx); 252 if (--ptrace_cbref == 0) 253 cv_broadcast(&ptrace_cv); 254 mutex_exit(&ptrace_mtx); 255 #endif 256 257 return result; 258 } 259 260 int 261 ptrace_init(void) 262 { 263 264 #if 0 265 mutex_init(&ptrace_mtx, MUTEX_DEFAULT, IPL_NONE); 266 cv_init(&ptrace_cv, "ptracecb"); 267 ptrace_cbref = 0; 268 #endif 269 ptrace_listener = kauth_listen_scope(KAUTH_SCOPE_PROCESS, 270 ptrace_listener_cb, NULL); 271 return 0; 272 } 273 274 int 275 ptrace_fini(void) 276 { 277 278 kauth_unlisten_scope(ptrace_listener); 279 280 #if 0 281 /* Make sure no-one is executing our kauth listener */ 282 283 mutex_enter(&ptrace_mtx); 284 while (ptrace_cbref != 0) 285 cv_wait(&ptrace_cv, &ptrace_mtx); 286 mutex_exit(&ptrace_mtx); 287 mutex_destroy(&ptrace_mtx); 288 cv_destroy(&ptrace_cv); 289 #endif 290 291 return 0; 292 } 293 294 int 295 do_ptrace(struct ptrace_methods *ptm, struct lwp *l, int req, pid_t pid, 296 void *addr, int data, register_t *retval) 297 { 298 struct proc *p = l->l_proc; 299 struct lwp *lt; 300 struct lwp *lt2; 301 struct proc *t; /* target process */ 302 struct uio uio; 303 struct iovec iov; 304 struct ptrace_io_desc piod; 305 struct ptrace_event pe; 306 struct ptrace_state ps; 307 struct ptrace_lwpinfo pl; 308 struct ptrace_siginfo psi; 309 struct vmspace *vm; 310 int error, write, tmp, pheld; 311 int signo = 0; 312 int resume_all; 313 ksiginfo_t ksi; 314 char *path; 315 int len = 0; 316 error = 0; 317 318 /* 319 * If attaching or detaching, we need to get a write hold on the 320 * proclist lock so that we can re-parent the target process. 321 */ 322 mutex_enter(proc_lock); 323 324 /* "A foolish consistency..." XXX */ 325 if (req == PT_TRACE_ME) { 326 t = p; 327 mutex_enter(t->p_lock); 328 } else { 329 /* Find the process we're supposed to be operating on. */ 330 t = proc_find(pid); 331 if (t == NULL) { 332 mutex_exit(proc_lock); 333 return ESRCH; 334 } 335 336 /* XXX-elad */ 337 mutex_enter(t->p_lock); 338 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, 339 t, KAUTH_ARG(KAUTH_REQ_PROCESS_CANSEE_ENTRY), NULL, NULL); 340 if (error) { 341 mutex_exit(proc_lock); 342 mutex_exit(t->p_lock); 343 return ESRCH; 344 } 345 } 346 347 /* 348 * Grab a reference on the process to prevent it from execing or 349 * exiting. 350 */ 351 if (!rw_tryenter(&t->p_reflock, RW_READER)) { 352 mutex_exit(proc_lock); 353 mutex_exit(t->p_lock); 354 return EBUSY; 355 } 356 357 /* Make sure we can operate on it. */ 358 switch (req) { 359 case PT_TRACE_ME: 360 /* Saying that you're being traced is always legal. */ 361 break; 362 363 case PT_ATTACH: 364 /* 365 * You can't attach to a process if: 366 * (1) it's the process that's doing the attaching, 367 */ 368 if (t->p_pid == p->p_pid) { 369 error = EINVAL; 370 break; 371 } 372 373 /* 374 * (2) it's a system process 375 */ 376 if (t->p_flag & PK_SYSTEM) { 377 error = EPERM; 378 break; 379 } 380 381 /* 382 * (3) it's already being traced, or 383 */ 384 if (ISSET(t->p_slflag, PSL_TRACED)) { 385 error = EBUSY; 386 break; 387 } 388 389 /* 390 * (4) the tracer is chrooted, and its root directory is 391 * not at or above the root directory of the tracee 392 */ 393 mutex_exit(t->p_lock); /* XXXSMP */ 394 tmp = proc_isunder(t, l); 395 mutex_enter(t->p_lock); /* XXXSMP */ 396 if (!tmp) { 397 error = EPERM; 398 break; 399 } 400 break; 401 402 case PT_READ_I: 403 case PT_READ_D: 404 case PT_WRITE_I: 405 case PT_WRITE_D: 406 case PT_IO: 407 case PT_SET_SIGINFO: 408 case PT_GET_SIGINFO: 409 #ifdef PT_GETREGS 410 case PT_GETREGS: 411 #endif 412 #ifdef PT_SETREGS 413 case PT_SETREGS: 414 #endif 415 #ifdef PT_GETFPREGS 416 case PT_GETFPREGS: 417 #endif 418 #ifdef PT_SETFPREGS 419 case PT_SETFPREGS: 420 #endif 421 #ifdef PT_GETDBREGS 422 case PT_GETDBREGS: 423 #endif 424 #ifdef PT_SETDBREGS 425 case PT_SETDBREGS: 426 #endif 427 #ifdef __HAVE_PTRACE_MACHDEP 428 PTRACE_MACHDEP_REQUEST_CASES 429 #endif 430 /* 431 * You can't read/write the memory or registers of a process 432 * if the tracer is chrooted, and its root directory is not at 433 * or above the root directory of the tracee. 434 */ 435 mutex_exit(t->p_lock); /* XXXSMP */ 436 tmp = proc_isunder(t, l); 437 mutex_enter(t->p_lock); /* XXXSMP */ 438 if (!tmp) { 439 error = EPERM; 440 break; 441 } 442 /*FALLTHROUGH*/ 443 444 case PT_CONTINUE: 445 case PT_KILL: 446 case PT_DETACH: 447 case PT_LWPINFO: 448 case PT_SYSCALL: 449 case PT_SYSCALLEMU: 450 case PT_DUMPCORE: 451 #ifdef PT_STEP 452 case PT_STEP: 453 case PT_SETSTEP: 454 case PT_CLEARSTEP: 455 #endif 456 case PT_SET_EVENT_MASK: 457 case PT_GET_EVENT_MASK: 458 case PT_GET_PROCESS_STATE: 459 case PT_RESUME: 460 case PT_SUSPEND: 461 /* 462 * You can't do what you want to the process if: 463 * (1) It's not being traced at all, 464 */ 465 if (!ISSET(t->p_slflag, PSL_TRACED)) { 466 error = EPERM; 467 break; 468 } 469 470 /* 471 * (2) it's being traced by procfs (which has 472 * different signal delivery semantics), 473 */ 474 if (ISSET(t->p_slflag, PSL_FSTRACE)) { 475 DPRINTF(("file system traced\n")); 476 error = EBUSY; 477 break; 478 } 479 480 /* 481 * (3) it's not being traced by _you_, or 482 */ 483 if (t->p_pptr != p) { 484 DPRINTF(("parent %d != %d\n", t->p_pptr->p_pid, 485 p->p_pid)); 486 error = EBUSY; 487 break; 488 } 489 490 /* 491 * (4) it's not currently stopped. 492 */ 493 if (t->p_stat != SSTOP || !t->p_waited /* XXXSMP */) { 494 DPRINTF(("stat %d flag %d\n", t->p_stat, 495 !t->p_waited)); 496 error = EBUSY; 497 break; 498 } 499 break; 500 501 default: /* It was not a legal request. */ 502 error = EINVAL; 503 break; 504 } 505 506 if (error == 0) { 507 error = kauth_authorize_process(l->l_cred, 508 KAUTH_PROCESS_PTRACE, t, KAUTH_ARG(req), 509 NULL, NULL); 510 } 511 if (error == 0) { 512 lt = lwp_find_first(t); 513 if (lt == NULL) 514 error = ESRCH; 515 } 516 517 if (error != 0) { 518 mutex_exit(proc_lock); 519 mutex_exit(t->p_lock); 520 rw_exit(&t->p_reflock); 521 return error; 522 } 523 524 /* Do single-step fixup if needed. */ 525 FIX_SSTEP(t); 526 KASSERT(lt != NULL); 527 lwp_addref(lt); 528 529 /* 530 * Which locks do we need held? XXX Ugly. 531 */ 532 switch (req) { 533 #ifdef PT_STEP 534 case PT_STEP: 535 #endif 536 case PT_CONTINUE: 537 case PT_DETACH: 538 case PT_KILL: 539 case PT_SYSCALL: 540 case PT_SYSCALLEMU: 541 case PT_ATTACH: 542 case PT_TRACE_ME: 543 pheld = 1; 544 break; 545 default: 546 mutex_exit(proc_lock); 547 mutex_exit(t->p_lock); 548 pheld = 0; 549 break; 550 } 551 552 /* Now do the operation. */ 553 write = 0; 554 *retval = 0; 555 tmp = 0; 556 resume_all = 1; 557 558 switch (req) { 559 case PT_TRACE_ME: 560 /* Just set the trace flag. */ 561 SET(t->p_slflag, PSL_TRACED); 562 t->p_opptr = t->p_pptr; 563 break; 564 565 case PT_WRITE_I: /* XXX no separate I and D spaces */ 566 case PT_WRITE_D: 567 #if defined(__HAVE_RAS) 568 /* 569 * Can't write to a RAS 570 */ 571 if (ras_lookup(t, addr) != (void *)-1) { 572 error = EACCES; 573 break; 574 } 575 #endif 576 write = 1; 577 tmp = data; 578 /* FALLTHROUGH */ 579 580 case PT_READ_I: /* XXX no separate I and D spaces */ 581 case PT_READ_D: 582 /* write = 0 done above. */ 583 iov.iov_base = (void *)&tmp; 584 iov.iov_len = sizeof(tmp); 585 uio.uio_iov = &iov; 586 uio.uio_iovcnt = 1; 587 uio.uio_offset = (off_t)(unsigned long)addr; 588 uio.uio_resid = sizeof(tmp); 589 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 590 UIO_SETUP_SYSSPACE(&uio); 591 592 error = process_domem(l, lt, &uio); 593 if (!write) 594 *retval = tmp; 595 break; 596 597 case PT_IO: 598 error = ptm->ptm_copyinpiod(&piod, addr); 599 if (error) 600 break; 601 602 iov.iov_base = piod.piod_addr; 603 iov.iov_len = piod.piod_len; 604 uio.uio_iov = &iov; 605 uio.uio_iovcnt = 1; 606 uio.uio_offset = (off_t)(unsigned long)piod.piod_offs; 607 uio.uio_resid = piod.piod_len; 608 609 switch (piod.piod_op) { 610 case PIOD_READ_D: 611 case PIOD_READ_I: 612 uio.uio_rw = UIO_READ; 613 break; 614 case PIOD_WRITE_D: 615 case PIOD_WRITE_I: 616 /* 617 * Can't write to a RAS 618 */ 619 if (ras_lookup(t, addr) != (void *)-1) { 620 return EACCES; 621 } 622 uio.uio_rw = UIO_WRITE; 623 break; 624 case PIOD_READ_AUXV: 625 req = PT_READ_D; 626 uio.uio_rw = UIO_READ; 627 tmp = t->p_execsw->es_arglen; 628 if (uio.uio_offset > tmp) 629 return EIO; 630 if (uio.uio_resid > tmp - uio.uio_offset) 631 uio.uio_resid = tmp - uio.uio_offset; 632 piod.piod_len = iov.iov_len = uio.uio_resid; 633 error = process_auxv_offset(t, &uio); 634 break; 635 default: 636 error = EINVAL; 637 break; 638 } 639 if (error) 640 break; 641 error = proc_vmspace_getref(l->l_proc, &vm); 642 if (error) 643 break; 644 uio.uio_vmspace = vm; 645 646 error = process_domem(l, lt, &uio); 647 piod.piod_len -= uio.uio_resid; 648 (void) ptm->ptm_copyoutpiod(&piod, addr); 649 650 uvmspace_free(vm); 651 break; 652 653 case PT_DUMPCORE: 654 if ((path = addr) != NULL) { 655 char *dst; 656 len = data; 657 658 if (len < 0 || len >= MAXPATHLEN) { 659 error = EINVAL; 660 break; 661 } 662 dst = kmem_alloc(len + 1, KM_SLEEP); 663 if ((error = copyin(path, dst, len)) != 0) { 664 kmem_free(dst, len + 1); 665 break; 666 } 667 path = dst; 668 path[len] = '\0'; 669 } 670 error = (*coredump_vec)(lt, path); 671 if (path) 672 kmem_free(path, len + 1); 673 break; 674 675 #ifdef PT_STEP 676 case PT_STEP: 677 /* 678 * From the 4.4BSD PRM: 679 * "Execution continues as in request PT_CONTINUE; however 680 * as soon as possible after execution of at least one 681 * instruction, execution stops again. [ ... ]" 682 */ 683 #endif 684 case PT_CONTINUE: 685 case PT_SYSCALL: 686 case PT_DETACH: 687 if (req == PT_SYSCALL) { 688 if (!ISSET(t->p_slflag, PSL_SYSCALL)) { 689 SET(t->p_slflag, PSL_SYSCALL); 690 #ifdef __HAVE_SYSCALL_INTERN 691 (*t->p_emul->e_syscall_intern)(t); 692 #endif 693 } 694 } else { 695 if (ISSET(t->p_slflag, PSL_SYSCALL)) { 696 CLR(t->p_slflag, PSL_SYSCALL); 697 #ifdef __HAVE_SYSCALL_INTERN 698 (*t->p_emul->e_syscall_intern)(t); 699 #endif 700 } 701 } 702 t->p_trace_enabled = trace_is_enabled(t); 703 704 /* 705 * Pick up the LWPID, if supplied. There are two cases: 706 * data < 0 : step or continue single thread, lwp = -data 707 * data > 0 in PT_STEP : step this thread, continue others 708 * For operations other than PT_STEP, data > 0 means 709 * data is the signo to deliver to the process. 710 */ 711 tmp = data; 712 if (tmp >= 0) { 713 #ifdef PT_STEP 714 if (req == PT_STEP) 715 signo = 0; 716 else 717 #endif 718 { 719 signo = tmp; 720 tmp = 0; /* don't search for LWP */ 721 } 722 } else 723 tmp = -tmp; 724 725 if (tmp > 0) { 726 if (req == PT_DETACH) { 727 error = EINVAL; 728 break; 729 } 730 lwp_delref2 (lt); 731 lt = lwp_find(t, tmp); 732 if (lt == NULL) { 733 error = ESRCH; 734 break; 735 } 736 lwp_addref(lt); 737 resume_all = 0; 738 signo = 0; 739 } 740 741 /* 742 * From the 4.4BSD PRM: 743 * "The data argument is taken as a signal number and the 744 * child's execution continues at location addr as if it 745 * incurred that signal. Normally the signal number will 746 * be either 0 to indicate that the signal that caused the 747 * stop should be ignored, or that value fetched out of 748 * the process's image indicating which signal caused 749 * the stop. If addr is (int *)1 then execution continues 750 * from where it stopped." 751 */ 752 753 /* Check that the data is a valid signal number or zero. */ 754 if (signo < 0 || signo >= NSIG) { 755 error = EINVAL; 756 break; 757 } 758 759 /* Prevent process deadlock */ 760 if (resume_all) { 761 #ifdef PT_STEP 762 if (req == PT_STEP) { 763 if (lt->l_flag & LW_WSUSPEND) { 764 error = EDEADLK; 765 break; 766 } 767 } else 768 #endif 769 { 770 error = EDEADLK; 771 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 772 if ((lt2->l_flag & LW_WSUSPEND) == 0) { 773 error = 0; 774 break; 775 } 776 } 777 if (error != 0) 778 break; 779 } 780 } else { 781 if (lt->l_flag & LW_WSUSPEND) { 782 error = EDEADLK; 783 break; 784 } 785 } 786 787 /* If the address parameter is not (int *)1, set the pc. */ 788 if ((int *)addr != (int *)1) { 789 error = process_set_pc(lt, addr); 790 if (error != 0) 791 break; 792 } 793 #ifdef PT_STEP 794 /* 795 * Arrange for a single-step, if that's requested and possible. 796 * More precisely, set the single step status as requested for 797 * the requested thread, and clear it for other threads. 798 */ 799 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 800 if (ISSET(lt2->l_pflag, LP_SINGLESTEP)) { 801 lwp_lock(lt2); 802 process_sstep(lt2, 1); 803 lwp_unlock(lt2); 804 } else if (lt != lt2) { 805 lwp_lock(lt2); 806 process_sstep(lt2, 0); 807 lwp_unlock(lt2); 808 } 809 } 810 error = process_sstep(lt, 811 ISSET(lt->l_pflag, LP_SINGLESTEP) || req == PT_STEP); 812 if (error) 813 break; 814 #endif 815 if (req == PT_DETACH) { 816 CLR(t->p_slflag, PSL_TRACED|PSL_FSTRACE|PSL_SYSCALL); 817 818 /* give process back to original parent or init */ 819 if (t->p_opptr != t->p_pptr) { 820 struct proc *pp = t->p_opptr; 821 proc_reparent(t, pp ? pp : initproc); 822 } 823 824 /* not being traced any more */ 825 t->p_opptr = NULL; 826 827 /* clear single step */ 828 LIST_FOREACH(lt2, &t->p_lwps, l_sibling) { 829 CLR(lt2->l_pflag, LP_SINGLESTEP); 830 } 831 CLR(lt->l_pflag, LP_SINGLESTEP); 832 } 833 sendsig: 834 t->p_fpid = 0; 835 t->p_vfpid = 0; 836 t->p_vfpid_done = 0; 837 t->p_lwp_created = 0; 838 t->p_lwp_exited = 0; 839 /* Finally, deliver the requested signal (or none). */ 840 if (t->p_stat == SSTOP) { 841 /* 842 * Unstop the process. If it needs to take a 843 * signal, make all efforts to ensure that at 844 * an LWP runs to see it. 845 */ 846 t->p_xsig = signo; 847 if (resume_all) 848 proc_unstop(t); 849 else 850 lwp_unstop(lt); 851 } else if (t->p_sigctx.ps_faked) { 852 if (signo != t->p_sigctx.ps_info._signo) { 853 error = EINVAL; 854 break; 855 } 856 t->p_sigctx.ps_faked = false; 857 KSI_INIT_EMPTY(&ksi); 858 ksi.ksi_info = t->p_sigctx.ps_info; 859 ksi.ksi_lid = t->p_sigctx.ps_lwp; 860 kpsignal2(t, &ksi); 861 } else if (signo != 0) { 862 KSI_INIT_EMPTY(&ksi); 863 ksi.ksi_signo = signo; 864 kpsignal2(t, &ksi); 865 } 866 break; 867 868 case PT_SYSCALLEMU: 869 if (!ISSET(t->p_slflag, PSL_SYSCALL) || t->p_stat != SSTOP) { 870 error = EINVAL; 871 break; 872 } 873 SET(t->p_slflag, PSL_SYSCALLEMU); 874 break; 875 876 #ifdef PT_STEP 877 case PT_SETSTEP: 878 write = 1; 879 880 case PT_CLEARSTEP: 881 /* write = 0 done above. */ 882 883 tmp = data; 884 if (tmp != 0 && t->p_nlwps > 1) { 885 lwp_delref(lt); 886 mutex_enter(t->p_lock); 887 lt = lwp_find(t, tmp); 888 if (lt == NULL) { 889 mutex_exit(t->p_lock); 890 error = ESRCH; 891 break; 892 } 893 lwp_addref(lt); 894 mutex_exit(t->p_lock); 895 } 896 897 if (ISSET(lt->l_flag, LW_SYSTEM)) 898 error = EINVAL; 899 else if (write) 900 SET(lt->l_pflag, LP_SINGLESTEP); 901 else 902 CLR(lt->l_pflag, LP_SINGLESTEP); 903 break; 904 #endif 905 906 case PT_KILL: 907 /* just send the process a KILL signal. */ 908 signo = SIGKILL; 909 goto sendsig; /* in PT_CONTINUE, above. */ 910 911 case PT_ATTACH: 912 /* 913 * Go ahead and set the trace flag. 914 * Save the old parent (it's reset in 915 * _DETACH, and also in kern_exit.c:wait4() 916 * Reparent the process so that the tracing 917 * proc gets to see all the action. 918 * Stop the target. 919 */ 920 proc_changeparent(t, p); 921 signo = SIGSTOP; 922 goto sendsig; 923 924 case PT_GET_EVENT_MASK: 925 if (data != sizeof(pe)) { 926 DPRINTF(("ptrace(%d): %d != %zu\n", req, 927 data, sizeof(pe))); 928 error = EINVAL; 929 break; 930 } 931 memset(&pe, 0, sizeof(pe)); 932 pe.pe_set_event = ISSET(t->p_slflag, PSL_TRACEFORK) ? 933 PTRACE_FORK : 0; 934 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACEVFORK) ? 935 PTRACE_VFORK : 0; 936 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACEVFORK_DONE) ? 937 PTRACE_VFORK_DONE : 0; 938 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACELWP_CREATE) ? 939 PTRACE_LWP_CREATE : 0; 940 pe.pe_set_event |= ISSET(t->p_slflag, PSL_TRACELWP_EXIT) ? 941 PTRACE_LWP_EXIT : 0; 942 error = copyout(&pe, addr, sizeof(pe)); 943 break; 944 945 case PT_SET_EVENT_MASK: 946 if (data != sizeof(pe)) { 947 DPRINTF(("ptrace(%d): %d != %zu\n", req, data, 948 sizeof(pe))); 949 error = EINVAL; 950 break; 951 } 952 if ((error = copyin(addr, &pe, sizeof(pe))) != 0) 953 return error; 954 if (pe.pe_set_event & PTRACE_FORK) 955 SET(t->p_slflag, PSL_TRACEFORK); 956 else 957 CLR(t->p_slflag, PSL_TRACEFORK); 958 #if notyet 959 if (pe.pe_set_event & PTRACE_VFORK) 960 SET(t->p_slflag, PSL_TRACEVFORK); 961 else 962 CLR(t->p_slflag, PSL_TRACEVFORK); 963 #else 964 if (pe.pe_set_event & PTRACE_VFORK) { 965 error = ENOTSUP; 966 break; 967 } 968 #endif 969 if (pe.pe_set_event & PTRACE_VFORK_DONE) 970 SET(t->p_slflag, PSL_TRACEVFORK_DONE); 971 else 972 CLR(t->p_slflag, PSL_TRACEVFORK_DONE); 973 if (pe.pe_set_event & PTRACE_LWP_CREATE) 974 SET(t->p_slflag, PSL_TRACELWP_CREATE); 975 else 976 CLR(t->p_slflag, PSL_TRACELWP_CREATE); 977 if (pe.pe_set_event & PTRACE_LWP_EXIT) 978 SET(t->p_slflag, PSL_TRACELWP_EXIT); 979 else 980 CLR(t->p_slflag, PSL_TRACELWP_EXIT); 981 break; 982 983 case PT_GET_PROCESS_STATE: 984 if (data != sizeof(ps)) { 985 DPRINTF(("ptrace(%d): %d != %zu\n", req, data, 986 sizeof(ps))); 987 error = EINVAL; 988 break; 989 } 990 memset(&ps, 0, sizeof(ps)); 991 if (t->p_fpid) { 992 ps.pe_report_event = PTRACE_FORK; 993 ps.pe_other_pid = t->p_fpid; 994 } else if (t->p_vfpid) { 995 ps.pe_report_event = PTRACE_VFORK; 996 ps.pe_other_pid = t->p_vfpid; 997 } else if (t->p_vfpid_done) { 998 ps.pe_report_event = PTRACE_VFORK_DONE; 999 ps.pe_other_pid = t->p_vfpid_done; 1000 } else if (t->p_lwp_created) { 1001 ps.pe_report_event = PTRACE_LWP_CREATE; 1002 ps.pe_lwp = t->p_lwp_created; 1003 } else if (t->p_lwp_exited) { 1004 ps.pe_report_event = PTRACE_LWP_EXIT; 1005 ps.pe_lwp = t->p_lwp_exited; 1006 } 1007 error = copyout(&ps, addr, sizeof(ps)); 1008 break; 1009 1010 case PT_LWPINFO: 1011 if (data != sizeof(pl)) { 1012 DPRINTF(("ptrace(%d): %d != %zu\n", req, data, 1013 sizeof(pl))); 1014 error = EINVAL; 1015 break; 1016 } 1017 error = copyin(addr, &pl, sizeof(pl)); 1018 if (error) 1019 break; 1020 tmp = pl.pl_lwpid; 1021 lwp_delref(lt); 1022 mutex_enter(t->p_lock); 1023 if (tmp == 0) 1024 lt = lwp_find_first(t); 1025 else { 1026 lt = lwp_find(t, tmp); 1027 if (lt == NULL) { 1028 mutex_exit(t->p_lock); 1029 error = ESRCH; 1030 break; 1031 } 1032 lt = LIST_NEXT(lt, l_sibling); 1033 } 1034 while (lt != NULL && !lwp_alive(lt)) 1035 lt = LIST_NEXT(lt, l_sibling); 1036 pl.pl_lwpid = 0; 1037 pl.pl_event = 0; 1038 if (lt) { 1039 lwp_addref(lt); 1040 pl.pl_lwpid = lt->l_lid; 1041 1042 if (lt->l_flag & LW_WSUSPEND) 1043 pl.pl_event = PL_EVENT_SUSPENDED; 1044 /* 1045 * If we match the lwp, or it was sent to every lwp, 1046 * we set PL_EVENT_SIGNAL. 1047 * XXX: ps_lwp == 0 means everyone and noone, so 1048 * check ps_signo too. 1049 */ 1050 else if (lt->l_lid == t->p_sigctx.ps_lwp 1051 || (t->p_sigctx.ps_lwp == 0 && 1052 t->p_sigctx.ps_info._signo)) 1053 pl.pl_event = PL_EVENT_SIGNAL; 1054 } 1055 mutex_exit(t->p_lock); 1056 1057 error = copyout(&pl, addr, sizeof(pl)); 1058 break; 1059 1060 case PT_SET_SIGINFO: 1061 if (data != sizeof(psi)) { 1062 DPRINTF(("ptrace(%d): %d != %zu\n", req, data, 1063 sizeof(psi))); 1064 error = EINVAL; 1065 break; 1066 } 1067 1068 error = copyin(addr, &psi, sizeof(psi)); 1069 if (error) 1070 break; 1071 1072 /* Check that the data is a valid signal number or zero. */ 1073 if (psi.psi_siginfo.si_signo < 0 || 1074 psi.psi_siginfo.si_signo >= NSIG) { 1075 error = EINVAL; 1076 break; 1077 } 1078 1079 tmp = psi.psi_lwpid; 1080 if (tmp != 0) 1081 lwp_delref(lt); 1082 1083 mutex_enter(t->p_lock); 1084 1085 if (tmp != 0) { 1086 lt = lwp_find(t, tmp); 1087 if (lt == NULL) { 1088 mutex_exit(t->p_lock); 1089 error = ESRCH; 1090 break; 1091 } 1092 lwp_addref(lt); 1093 } 1094 1095 t->p_sigctx.ps_faked = true; 1096 t->p_sigctx.ps_info = psi.psi_siginfo._info; 1097 t->p_sigctx.ps_lwp = psi.psi_lwpid; 1098 mutex_exit(t->p_lock); 1099 break; 1100 1101 case PT_GET_SIGINFO: 1102 if (data != sizeof(psi)) { 1103 DPRINTF(("ptrace(%d): %d != %zu\n", req, data, 1104 sizeof(psi))); 1105 error = EINVAL; 1106 break; 1107 } 1108 mutex_enter(t->p_lock); 1109 psi.psi_siginfo._info = t->p_sigctx.ps_info; 1110 psi.psi_lwpid = t->p_sigctx.ps_lwp; 1111 mutex_exit(t->p_lock); 1112 1113 error = copyout(&psi, addr, sizeof(psi)); 1114 if (error) 1115 break; 1116 1117 break; 1118 1119 case PT_RESUME: 1120 write = 1; 1121 1122 case PT_SUSPEND: 1123 /* write = 0 done above. */ 1124 1125 tmp = data; 1126 if (tmp != 0 && t->p_nlwps > 1) { 1127 lwp_delref(lt); 1128 mutex_enter(t->p_lock); 1129 lt = lwp_find(t, tmp); 1130 if (lt == NULL) { 1131 mutex_exit(t->p_lock); 1132 error = ESRCH; 1133 break; 1134 } 1135 lwp_addref(lt); 1136 mutex_exit(t->p_lock); 1137 } 1138 if (lt->l_flag & LW_SYSTEM) { 1139 error = EINVAL; 1140 } else { 1141 lwp_lock(lt); 1142 if (write == 0) 1143 lt->l_flag |= LW_WSUSPEND; 1144 else 1145 lt->l_flag &= ~LW_WSUSPEND; 1146 lwp_unlock(lt); 1147 } 1148 break; 1149 1150 #ifdef PT_SETREGS 1151 case PT_SETREGS: 1152 write = 1; 1153 #endif 1154 #ifdef PT_GETREGS 1155 case PT_GETREGS: 1156 /* write = 0 done above. */ 1157 #endif 1158 #if defined(PT_SETREGS) || defined(PT_GETREGS) 1159 tmp = data; 1160 if (tmp != 0 && t->p_nlwps > 1) { 1161 lwp_delref(lt); 1162 mutex_enter(t->p_lock); 1163 lt = lwp_find(t, tmp); 1164 if (lt == NULL) { 1165 mutex_exit(t->p_lock); 1166 error = ESRCH; 1167 break; 1168 } 1169 lwp_addref(lt); 1170 mutex_exit(t->p_lock); 1171 } 1172 if (!process_validregs(lt)) 1173 error = EINVAL; 1174 else { 1175 error = proc_vmspace_getref(p, &vm); 1176 if (error) 1177 break; 1178 iov.iov_base = addr; 1179 iov.iov_len = PROC_REGSZ(p); 1180 uio.uio_iov = &iov; 1181 uio.uio_iovcnt = 1; 1182 uio.uio_offset = 0; 1183 uio.uio_resid = iov.iov_len; 1184 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 1185 uio.uio_vmspace = vm; 1186 1187 error = ptm->ptm_doregs(l, lt, &uio); 1188 uvmspace_free(vm); 1189 } 1190 break; 1191 #endif 1192 1193 #ifdef PT_SETFPREGS 1194 case PT_SETFPREGS: 1195 write = 1; 1196 /*FALLTHROUGH*/ 1197 #endif 1198 #ifdef PT_GETFPREGS 1199 case PT_GETFPREGS: 1200 /* write = 0 done above. */ 1201 #endif 1202 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 1203 tmp = data; 1204 if (tmp != 0 && t->p_nlwps > 1) { 1205 lwp_delref(lt); 1206 mutex_enter(t->p_lock); 1207 lt = lwp_find(t, tmp); 1208 if (lt == NULL) { 1209 mutex_exit(t->p_lock); 1210 error = ESRCH; 1211 break; 1212 } 1213 lwp_addref(lt); 1214 mutex_exit(t->p_lock); 1215 } 1216 if (!process_validfpregs(lt)) 1217 error = EINVAL; 1218 else { 1219 error = proc_vmspace_getref(p, &vm); 1220 if (error) 1221 break; 1222 iov.iov_base = addr; 1223 iov.iov_len = PROC_FPREGSZ(p); 1224 uio.uio_iov = &iov; 1225 uio.uio_iovcnt = 1; 1226 uio.uio_offset = 0; 1227 uio.uio_resid = iov.iov_len; 1228 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 1229 uio.uio_vmspace = vm; 1230 1231 error = ptm->ptm_dofpregs(l, lt, &uio); 1232 uvmspace_free(vm); 1233 } 1234 break; 1235 #endif 1236 1237 #ifdef PT_SETDBREGS 1238 case PT_SETDBREGS: 1239 write = 1; 1240 /*FALLTHROUGH*/ 1241 #endif 1242 #ifdef PT_GETDBREGS 1243 case PT_GETDBREGS: 1244 /* write = 0 done above. */ 1245 #endif 1246 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 1247 tmp = data; 1248 if (tmp != 0 && t->p_nlwps > 1) { 1249 lwp_delref(lt); 1250 mutex_enter(t->p_lock); 1251 lt = lwp_find(t, tmp); 1252 if (lt == NULL) { 1253 mutex_exit(t->p_lock); 1254 error = ESRCH; 1255 break; 1256 } 1257 lwp_addref(lt); 1258 mutex_exit(t->p_lock); 1259 } 1260 if (!process_validdbregs(lt)) 1261 error = EINVAL; 1262 else { 1263 error = proc_vmspace_getref(p, &vm); 1264 if (error) 1265 break; 1266 iov.iov_base = addr; 1267 iov.iov_len = PROC_DBREGSZ(p); 1268 uio.uio_iov = &iov; 1269 uio.uio_iovcnt = 1; 1270 uio.uio_offset = 0; 1271 uio.uio_resid = iov.iov_len; 1272 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 1273 uio.uio_vmspace = vm; 1274 1275 error = ptm->ptm_dodbregs(l, lt, &uio); 1276 uvmspace_free(vm); 1277 } 1278 break; 1279 #endif 1280 1281 #ifdef __HAVE_PTRACE_MACHDEP 1282 PTRACE_MACHDEP_REQUEST_CASES 1283 error = ptrace_machdep_dorequest(l, lt, req, addr, data); 1284 break; 1285 #endif 1286 } 1287 1288 if (pheld) { 1289 mutex_exit(t->p_lock); 1290 mutex_exit(proc_lock); 1291 } 1292 if (lt != NULL) 1293 lwp_delref(lt); 1294 rw_exit(&t->p_reflock); 1295 1296 return error; 1297 } 1298 1299 int 1300 process_doregs(struct lwp *curl /*tracer*/, 1301 struct lwp *l /*traced*/, 1302 struct uio *uio) 1303 { 1304 #if defined(PT_GETREGS) || defined(PT_SETREGS) 1305 int error; 1306 struct reg r; 1307 char *kv; 1308 int kl; 1309 1310 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r)) 1311 return EINVAL; 1312 1313 kl = sizeof(r); 1314 kv = (char *)&r; 1315 1316 kv += uio->uio_offset; 1317 kl -= uio->uio_offset; 1318 if ((size_t)kl > uio->uio_resid) 1319 kl = uio->uio_resid; 1320 1321 error = process_read_regs(l, &r); 1322 if (error == 0) 1323 error = uiomove(kv, kl, uio); 1324 if (error == 0 && uio->uio_rw == UIO_WRITE) { 1325 if (l->l_stat != LSSTOP) 1326 error = EBUSY; 1327 else 1328 error = process_write_regs(l, &r); 1329 } 1330 1331 uio->uio_offset = 0; 1332 return error; 1333 #else 1334 return EINVAL; 1335 #endif 1336 } 1337 1338 int 1339 process_validregs(struct lwp *l) 1340 { 1341 1342 #if defined(PT_SETREGS) || defined(PT_GETREGS) 1343 return (l->l_flag & LW_SYSTEM) == 0; 1344 #else 1345 return 0; 1346 #endif 1347 } 1348 1349 int 1350 process_dofpregs(struct lwp *curl /*tracer*/, 1351 struct lwp *l /*traced*/, 1352 struct uio *uio) 1353 { 1354 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 1355 int error; 1356 struct fpreg r; 1357 char *kv; 1358 size_t kl; 1359 1360 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r)) 1361 return EINVAL; 1362 1363 kl = sizeof(r); 1364 kv = (char *)&r; 1365 1366 kv += uio->uio_offset; 1367 kl -= uio->uio_offset; 1368 if (kl > uio->uio_resid) 1369 kl = uio->uio_resid; 1370 1371 error = process_read_fpregs(l, &r, &kl); 1372 if (error == 0) 1373 error = uiomove(kv, kl, uio); 1374 if (error == 0 && uio->uio_rw == UIO_WRITE) { 1375 if (l->l_stat != LSSTOP) 1376 error = EBUSY; 1377 else 1378 error = process_write_fpregs(l, &r, kl); 1379 } 1380 uio->uio_offset = 0; 1381 return error; 1382 #else 1383 return EINVAL; 1384 #endif 1385 } 1386 1387 int 1388 process_validfpregs(struct lwp *l) 1389 { 1390 1391 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 1392 return (l->l_flag & LW_SYSTEM) == 0; 1393 #else 1394 return 0; 1395 #endif 1396 } 1397 1398 int 1399 process_dodbregs(struct lwp *curl /*tracer*/, 1400 struct lwp *l /*traced*/, 1401 struct uio *uio) 1402 { 1403 #if defined(PT_GETDBREGS) || defined(PT_SETDBREGS) 1404 int error; 1405 struct dbreg r; 1406 char *kv; 1407 size_t kl; 1408 1409 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r)) 1410 return EINVAL; 1411 1412 kl = sizeof(r); 1413 kv = (char *)&r; 1414 1415 kv += uio->uio_offset; 1416 kl -= uio->uio_offset; 1417 if (kl > uio->uio_resid) 1418 kl = uio->uio_resid; 1419 1420 error = process_read_dbregs(l, &r, &kl); 1421 if (error == 0) 1422 error = uiomove(kv, kl, uio); 1423 if (error == 0 && uio->uio_rw == UIO_WRITE) { 1424 if (l->l_stat != LSSTOP) 1425 error = EBUSY; 1426 else 1427 error = process_write_dbregs(l, &r, kl); 1428 } 1429 uio->uio_offset = 0; 1430 return error; 1431 #else 1432 return EINVAL; 1433 #endif 1434 } 1435 1436 int 1437 process_validdbregs(struct lwp *l) 1438 { 1439 1440 #if defined(PT_SETDBREGS) || defined(PT_GETDBREGS) 1441 return (l->l_flag & LW_SYSTEM) == 0; 1442 #else 1443 return 0; 1444 #endif 1445 } 1446 1447 static int 1448 process_auxv_offset(struct proc *p, struct uio *uio) 1449 { 1450 struct ps_strings pss; 1451 int error; 1452 off_t off = (off_t)p->p_psstrp; 1453 1454 if ((error = copyin_psstrings(p, &pss)) != 0) 1455 return error; 1456 1457 if (pss.ps_envstr == NULL) 1458 return EIO; 1459 1460 uio->uio_offset += (off_t)(vaddr_t)(pss.ps_envstr + pss.ps_nenvstr + 1); 1461 #ifdef __MACHINE_STACK_GROWS_UP 1462 if (uio->uio_offset < off) 1463 return EIO; 1464 #else 1465 if (uio->uio_offset > off) 1466 return EIO; 1467 if ((uio->uio_offset + uio->uio_resid) > off) 1468 uio->uio_resid = off - uio->uio_offset; 1469 #endif 1470 return 0; 1471 } 1472 #endif /* PTRACE */ 1473 1474 MODULE(MODULE_CLASS_EXEC, ptrace_common, ""); 1475 1476 static int 1477 ptrace_common_modcmd(modcmd_t cmd, void *arg) 1478 { 1479 int error; 1480 1481 switch (cmd) { 1482 case MODULE_CMD_INIT: 1483 error = ptrace_init(); 1484 break; 1485 case MODULE_CMD_FINI: 1486 error = ptrace_fini(); 1487 break; 1488 default: 1489 ptrace_hooks(); 1490 error = ENOTTY; 1491 break; 1492 } 1493 return error; 1494 } 1495
Indexes created Tue Sep 30 20:09:53 GMT 2025