1 /* $NetBSD: sys_process.c,v 1.121 2007/02/17 22:31:44 pavel Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * (c) UNIX System Laboratories, Inc. 7 * All or some portions of this file are derived from material licensed 8 * to the University of California by American Telephone and Telegraph 9 * Co. or Unix System Laboratories, Inc. and are reproduced herein with 10 * the permission of UNIX System Laboratories, Inc. 11 * 12 * This code is derived from software contributed to Berkeley by 13 * Jan-Simon Pendry. 14 * 15 * Redistribution and use in source and binary forms, with or without 16 * modification, are permitted provided that the following conditions 17 * are met: 18 * 1. Redistributions of source code must retain the above copyright 19 * notice, this list of conditions and the following disclaimer. 20 * 2. Redistributions in binary form must reproduce the above copyright 21 * notice, this list of conditions and the following disclaimer in the 22 * documentation and/or other materials provided with the distribution. 23 * 3. Neither the name of the University nor the names of its contributors 24 * may be used to endorse or promote products derived from this software 25 * without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 37 * SUCH DAMAGE. 38 * 39 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 40 */ 41 42 /*- 43 * Copyright (c) 1993 Jan-Simon Pendry. 44 * Copyright (c) 1994 Christopher G. Demetriou. All rights reserved. 45 * 46 * This code is derived from software contributed to Berkeley by 47 * Jan-Simon Pendry. 48 * 49 * Redistribution and use in source and binary forms, with or without 50 * modification, are permitted provided that the following conditions 51 * are met: 52 * 1. Redistributions of source code must retain the above copyright 53 * notice, this list of conditions and the following disclaimer. 54 * 2. Redistributions in binary form must reproduce the above copyright 55 * notice, this list of conditions and the following disclaimer in the 56 * documentation and/or other materials provided with the distribution. 57 * 3. All advertising materials mentioning features or use of this software 58 * must display the following acknowledgement: 59 * This product includes software developed by the University of 60 * California, Berkeley and its contributors. 61 * 4. Neither the name of the University nor the names of its contributors 62 * may be used to endorse or promote products derived from this software 63 * without specific prior written permission. 64 * 65 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 66 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 67 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 68 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 69 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 70 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 71 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 72 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 73 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 74 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 75 * SUCH DAMAGE. 76 * 77 * from: @(#)sys_process.c 8.1 (Berkeley) 6/10/93 78 */ 79 80 /* 81 * References: 82 * (1) Bach's "The Design of the UNIX Operating System", 83 * (2) sys/miscfs/procfs from UCB's 4.4BSD-Lite distribution, 84 * (3) the "4.4BSD Programmer's Reference Manual" published 85 * by USENIX and O'Reilly & Associates. 86 * The 4.4BSD PRM does a reasonably good job of documenting what the various 87 * ptrace() requests should actually do, and its text is quoted several times 88 * in this file. 89 */ 90 91 #include "opt_coredump.h" 92 #include "opt_ptrace.h" 93 #include "opt_ktrace.h" 94 95 #include <sys/cdefs.h> 96 __KERNEL_RCSID(0, "$NetBSD: sys_process.c,v 1.121 2007/02/17 22:31:44 pavel Exp $"); 97 98 #include <sys/param.h> 99 #include <sys/systm.h> 100 #include <sys/proc.h> 101 #include <sys/errno.h> 102 #include <sys/ptrace.h> 103 #include <sys/uio.h> 104 #include <sys/user.h> 105 #include <sys/ras.h> 106 #include <sys/malloc.h> 107 #include <sys/kauth.h> 108 #include <sys/mount.h> 109 #include <sys/syscallargs.h> 110 111 #include <uvm/uvm_extern.h> 112 113 #include <machine/reg.h> 114 115 #ifdef PTRACE 116 /* 117 * Process debugging system call. 118 */ 119 int 120 sys_ptrace(struct lwp *l, void *v, register_t *retval) 121 { 122 struct sys_ptrace_args /* { 123 syscallarg(int) req; 124 syscallarg(pid_t) pid; 125 syscallarg(caddr_t) addr; 126 syscallarg(int) data; 127 } */ *uap = v; 128 struct proc *p = l->l_proc; 129 struct lwp *lt; 130 struct proc *t; /* target process */ 131 struct uio uio; 132 struct iovec iov; 133 struct ptrace_io_desc piod; 134 struct ptrace_lwpinfo pl; 135 struct vmspace *vm; 136 int error, write, tmp, req, pheld; 137 ksiginfo_t ksi; 138 #ifdef COREDUMP 139 char *path; 140 #endif 141 142 error = 0; 143 req = SCARG(uap, req); 144 145 /* 146 * If attaching or detaching, we need to get a write hold on the 147 * proclist lock so that we can re-parent the target process. 148 */ 149 rw_enter(&proclist_lock, RW_WRITER); 150 151 /* "A foolish consistency..." XXX */ 152 if (req == PT_TRACE_ME) 153 t = p; 154 else { 155 /* Find the process we're supposed to be operating on. */ 156 if ((t = p_find(SCARG(uap, pid), PFIND_LOCKED)) == NULL) { 157 rw_exit(&proclist_lock); 158 return (ESRCH); 159 } 160 161 /* XXX elad - this should be in pfind(). */ 162 error = kauth_authorize_process(l->l_cred, KAUTH_PROCESS_CANSEE, 163 t, NULL, NULL, NULL); 164 if (error) { 165 rw_exit(&proclist_lock); 166 return (ESRCH); 167 } 168 } 169 170 /* 171 * Grab a reference on the process to prevent it from execing or 172 * exiting. 173 */ 174 mutex_enter(&t->p_mutex); 175 error = proc_addref(t); 176 if (error != 0) { 177 mutex_exit(&t->p_mutex); 178 rw_exit(&proclist_lock); 179 return error; 180 } 181 182 /* Make sure we can operate on it. */ 183 switch (req) { 184 case PT_TRACE_ME: 185 /* Saying that you're being traced is always legal. */ 186 break; 187 188 case PT_ATTACH: 189 /* 190 * You can't attach to a process if: 191 * (1) it's the process that's doing the attaching, 192 */ 193 if (t->p_pid == p->p_pid) { 194 error = EINVAL; 195 break; 196 } 197 198 /* 199 * (2) it's a system process 200 */ 201 if (t->p_flag & PK_SYSTEM) { 202 error = EPERM; 203 break; 204 } 205 206 /* 207 * (3) it's already being traced, or 208 */ 209 if (ISSET(t->p_slflag, PSL_TRACED)) { 210 error = EBUSY; 211 break; 212 } 213 214 /* 215 * (4) the tracer is chrooted, and its root directory is 216 * not at or above the root directory of the tracee 217 */ 218 mutex_exit(&t->p_mutex); /* XXXSMP */ 219 tmp = proc_isunder(t, l); 220 mutex_enter(&t->p_mutex); /* XXXSMP */ 221 if (!tmp) { 222 error = EPERM; 223 break; 224 } 225 break; 226 227 case PT_READ_I: 228 case PT_READ_D: 229 case PT_WRITE_I: 230 case PT_WRITE_D: 231 case PT_IO: 232 #ifdef PT_GETREGS 233 case PT_GETREGS: 234 #endif 235 #ifdef PT_SETREGS 236 case PT_SETREGS: 237 #endif 238 #ifdef PT_GETFPREGS 239 case PT_GETFPREGS: 240 #endif 241 #ifdef PT_SETFPREGS 242 case PT_SETFPREGS: 243 #endif 244 #ifdef __HAVE_PTRACE_MACHDEP 245 PTRACE_MACHDEP_REQUEST_CASES 246 #endif 247 /* 248 * You can't read/write the memory or registers of a process 249 * if the tracer is chrooted, and its root directory is not at 250 * or above the root directory of the tracee. 251 */ 252 mutex_exit(&t->p_mutex); /* XXXSMP */ 253 tmp = proc_isunder(t, l); 254 mutex_enter(&t->p_mutex); /* XXXSMP */ 255 if (!tmp) { 256 error = EPERM; 257 break; 258 } 259 /*FALLTHROUGH*/ 260 261 case PT_CONTINUE: 262 case PT_KILL: 263 case PT_DETACH: 264 case PT_LWPINFO: 265 case PT_SYSCALL: 266 #ifdef COREDUMP 267 case PT_DUMPCORE: 268 #endif 269 #ifdef PT_STEP 270 case PT_STEP: 271 #endif 272 /* 273 * You can't do what you want to the process if: 274 * (1) It's not being traced at all, 275 */ 276 if (!ISSET(t->p_slflag, PSL_TRACED)) { 277 error = EPERM; 278 break; 279 } 280 281 /* 282 * (2) it's being traced by procfs (which has 283 * different signal delivery semantics), 284 */ 285 if (ISSET(t->p_slflag, PSL_FSTRACE)) { 286 uprintf("file system traced\n"); 287 error = EBUSY; 288 break; 289 } 290 291 /* 292 * (3) it's not being traced by _you_, or 293 */ 294 if (t->p_pptr != p) { 295 uprintf("parent %d != %d\n", t->p_pptr->p_pid, p->p_pid); 296 error = EBUSY; 297 break; 298 } 299 300 /* 301 * (4) it's not currently stopped. 302 */ 303 if (t->p_stat != SSTOP || !t->p_waited /* XXXSMP */) { 304 uprintf("stat %d flag %d\n", t->p_stat, 305 !t->p_waited); 306 error = EBUSY; 307 break; 308 } 309 break; 310 311 default: /* It was not a legal request. */ 312 error = EINVAL; 313 break; 314 } 315 316 if (error == 0) 317 error = kauth_authorize_process(l->l_cred, 318 KAUTH_PROCESS_CANPTRACE, t, KAUTH_ARG(req), 319 NULL, NULL); 320 321 if (error != 0) { 322 rw_exit(&proclist_lock); 323 proc_delref(t); 324 mutex_exit(&t->p_mutex); 325 return error; 326 } 327 328 /* 329 * Which locks do we need held? XXX Ugly. 330 */ 331 switch (req) { 332 #ifdef PT_STEP 333 case PT_STEP: 334 #endif 335 case PT_CONTINUE: 336 case PT_DETACH: 337 case PT_KILL: 338 case PT_SYSCALL: 339 case PT_ATTACH: 340 pheld = 1; 341 break; 342 default: 343 rw_exit(&proclist_lock); 344 mutex_exit(&t->p_mutex); 345 pheld = 0; 346 break; 347 } 348 349 350 /* Do single-step fixup if needed. */ 351 FIX_SSTEP(t); 352 353 /* 354 * XXX NJWLWP 355 * 356 * The entire ptrace interface needs work to be useful to a 357 * process with multiple LWPs. For the moment, we'll kluge 358 * this; memory access will be fine, but register access will 359 * be weird. 360 */ 361 mutex_enter(&t->p_smutex); 362 lt = proc_representative_lwp(t, NULL, 1); 363 lwp_addref(lt); 364 mutex_exit(&t->p_smutex); 365 366 /* Now do the operation. */ 367 write = 0; 368 *retval = 0; 369 tmp = 0; 370 371 switch (req) { 372 case PT_TRACE_ME: 373 /* Just set the trace flag. */ 374 mutex_enter(&t->p_smutex); 375 SET(t->p_slflag, PSL_TRACED); 376 mutex_exit(&t->p_smutex); 377 t->p_opptr = t->p_pptr; 378 break; 379 380 case PT_WRITE_I: /* XXX no separate I and D spaces */ 381 case PT_WRITE_D: 382 #if defined(__HAVE_RAS) 383 /* 384 * Can't write to a RAS 385 */ 386 if (ras_lookup(t, SCARG(uap, addr)) != (caddr_t)-1) { 387 error = EACCES; 388 break; 389 } 390 #endif 391 write = 1; 392 tmp = SCARG(uap, data); 393 /* FALLTHROUGH */ 394 395 case PT_READ_I: /* XXX no separate I and D spaces */ 396 case PT_READ_D: 397 /* write = 0 done above. */ 398 iov.iov_base = (caddr_t)&tmp; 399 iov.iov_len = sizeof(tmp); 400 uio.uio_iov = &iov; 401 uio.uio_iovcnt = 1; 402 uio.uio_offset = (off_t)(unsigned long)SCARG(uap, addr); 403 uio.uio_resid = sizeof(tmp); 404 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 405 UIO_SETUP_SYSSPACE(&uio); 406 407 error = process_domem(l, lt, &uio); 408 if (!write) 409 *retval = tmp; 410 break; 411 412 case PT_IO: 413 error = copyin(SCARG(uap, addr), &piod, sizeof(piod)); 414 if (error) 415 break; 416 switch (piod.piod_op) { 417 case PIOD_READ_D: 418 case PIOD_READ_I: 419 uio.uio_rw = UIO_READ; 420 break; 421 case PIOD_WRITE_D: 422 case PIOD_WRITE_I: 423 #if defined(__HAVE_RAS) 424 /* 425 * Can't write to a RAS 426 */ 427 if (!LIST_EMPTY(&t->p_raslist) && 428 (ras_lookup(t, SCARG(uap, addr)) != (caddr_t)-1)) { 429 return (EACCES); 430 } 431 #endif 432 uio.uio_rw = UIO_WRITE; 433 break; 434 default: 435 error = EINVAL; 436 break; 437 } 438 if (error) 439 break; 440 error = proc_vmspace_getref(l->l_proc, &vm); 441 if (error) 442 break; 443 iov.iov_base = piod.piod_addr; 444 iov.iov_len = piod.piod_len; 445 uio.uio_iov = &iov; 446 uio.uio_iovcnt = 1; 447 uio.uio_offset = (off_t)(unsigned long)piod.piod_offs; 448 uio.uio_resid = piod.piod_len; 449 uio.uio_vmspace = vm; 450 451 error = process_domem(l, lt, &uio); 452 piod.piod_len -= uio.uio_resid; 453 (void) copyout(&piod, SCARG(uap, addr), sizeof(piod)); 454 uvmspace_free(vm); 455 break; 456 457 #ifdef COREDUMP 458 case PT_DUMPCORE: 459 if ((path = SCARG(uap, addr)) != NULL) { 460 char *dst; 461 int len = SCARG(uap, data); 462 if (len < 0 || len >= MAXPATHLEN) { 463 error = EINVAL; 464 break; 465 } 466 dst = malloc(len + 1, M_TEMP, M_WAITOK); 467 if ((error = copyin(path, dst, len)) != 0) { 468 free(dst, M_TEMP); 469 break; 470 } 471 path = dst; 472 path[len] = '\0'; 473 } 474 error = coredump(lt, path); 475 if (path) 476 free(path, M_TEMP); 477 break; 478 #endif 479 480 #ifdef PT_STEP 481 case PT_STEP: 482 /* 483 * From the 4.4BSD PRM: 484 * "Execution continues as in request PT_CONTINUE; however 485 * as soon as possible after execution of at least one 486 * instruction, execution stops again. [ ... ]" 487 */ 488 #endif 489 case PT_CONTINUE: 490 case PT_SYSCALL: 491 case PT_DETACH: 492 mutex_enter(&t->p_smutex); 493 if (req == PT_SYSCALL) { 494 if (!ISSET(t->p_slflag, PSL_SYSCALL)) { 495 SET(t->p_slflag, PSL_SYSCALL); 496 #ifdef __HAVE_SYSCALL_INTERN 497 (*t->p_emul->e_syscall_intern)(t); 498 #endif 499 } 500 } else { 501 if (ISSET(t->p_slflag, PSL_SYSCALL)) { 502 CLR(t->p_slflag, PSL_SYSCALL); 503 #ifdef __HAVE_SYSCALL_INTERN 504 (*t->p_emul->e_syscall_intern)(t); 505 #endif 506 } 507 } 508 mutex_exit(&t->p_smutex); 509 510 /* 511 * From the 4.4BSD PRM: 512 * "The data argument is taken as a signal number and the 513 * child's execution continues at location addr as if it 514 * incurred that signal. Normally the signal number will 515 * be either 0 to indicate that the signal that caused the 516 * stop should be ignored, or that value fetched out of 517 * the process's image indicating which signal caused 518 * the stop. If addr is (int *)1 then execution continues 519 * from where it stopped." 520 */ 521 522 /* Check that the data is a valid signal number or zero. */ 523 if (SCARG(uap, data) < 0 || SCARG(uap, data) >= NSIG) { 524 error = EINVAL; 525 break; 526 } 527 528 PHOLD(lt); 529 530 /* If the address parameter is not (int *)1, set the pc. */ 531 if ((int *)SCARG(uap, addr) != (int *)1) 532 if ((error = process_set_pc(lt, SCARG(uap, addr))) != 0) { 533 PRELE(lt); 534 break; 535 } 536 537 #ifdef PT_STEP 538 /* 539 * Arrange for a single-step, if that's requested and possible. 540 */ 541 error = process_sstep(lt, req == PT_STEP); 542 if (error) { 543 PRELE(lt); 544 break; 545 } 546 #endif 547 548 PRELE(lt); 549 550 if (req == PT_DETACH) { 551 mutex_enter(&t->p_smutex); 552 CLR(t->p_slflag, PSL_TRACED|PSL_FSTRACE|PSL_SYSCALL); 553 mutex_exit(&t->p_smutex); 554 555 /* give process back to original parent or init */ 556 if (t->p_opptr != t->p_pptr) { 557 struct proc *pp = t->p_opptr; 558 proc_reparent(t, pp ? pp : initproc); 559 } 560 561 /* not being traced any more */ 562 t->p_opptr = NULL; 563 } 564 565 sendsig: 566 /* Finally, deliver the requested signal (or none). */ 567 mutex_enter(&proclist_mutex); 568 mutex_enter(&t->p_smutex); 569 if (t->p_stat == SSTOP) { 570 /* 571 * Unstop the process. If it needs to take a 572 * signal, make all efforts to ensure that at 573 * an LWP runs to see it. 574 */ 575 t->p_xstat = SCARG(uap, data); 576 proc_unstop(t); 577 } else if (SCARG(uap, data) != 0) { 578 KSI_INIT_EMPTY(&ksi); 579 ksi.ksi_signo = SCARG(uap, data); 580 kpsignal2(t, &ksi); 581 } 582 mutex_exit(&t->p_smutex); 583 mutex_exit(&proclist_mutex); 584 break; 585 586 case PT_KILL: 587 /* just send the process a KILL signal. */ 588 SCARG(uap, data) = SIGKILL; 589 goto sendsig; /* in PT_CONTINUE, above. */ 590 591 case PT_ATTACH: 592 /* 593 * Go ahead and set the trace flag. 594 * Save the old parent (it's reset in 595 * _DETACH, and also in kern_exit.c:wait4() 596 * Reparent the process so that the tracing 597 * proc gets to see all the action. 598 * Stop the target. 599 */ 600 t->p_opptr = t->p_pptr; 601 if (t->p_pptr != p) { 602 mutex_enter(&t->p_pptr->p_smutex); 603 t->p_pptr->p_slflag |= PSL_CHTRACED; 604 mutex_exit(&t->p_pptr->p_smutex); 605 proc_reparent(t, p); 606 } 607 mutex_enter(&t->p_smutex); 608 SET(t->p_slflag, PSL_TRACED); 609 mutex_exit(&t->p_smutex); 610 SCARG(uap, data) = SIGSTOP; 611 goto sendsig; 612 613 case PT_LWPINFO: 614 if (SCARG(uap, data) != sizeof(pl)) { 615 error = EINVAL; 616 break; 617 } 618 error = copyin(SCARG(uap, addr), &pl, sizeof(pl)); 619 if (error) 620 break; 621 tmp = pl.pl_lwpid; 622 lwp_delref(lt); 623 mutex_enter(&t->p_smutex); 624 if (tmp == 0) 625 lt = LIST_FIRST(&t->p_lwps); 626 else { 627 lt = lwp_find(p, tmp); 628 if (lt == NULL) { 629 mutex_exit(&t->p_smutex); 630 error = ESRCH; 631 break; 632 } 633 } 634 pl.pl_lwpid = 0; 635 pl.pl_event = 0; 636 if (lt) { 637 pl.pl_lwpid = lt->l_lid; 638 if (lt->l_lid == t->p_sigctx.ps_lwp) 639 pl.pl_event = PL_EVENT_SIGNAL; 640 } 641 mutex_exit(&t->p_smutex); 642 643 error = copyout(&pl, SCARG(uap, addr), sizeof(pl)); 644 break; 645 646 #ifdef PT_SETREGS 647 case PT_SETREGS: 648 write = 1; 649 #endif 650 #ifdef PT_GETREGS 651 case PT_GETREGS: 652 /* write = 0 done above. */ 653 #endif 654 #if defined(PT_SETREGS) || defined(PT_GETREGS) 655 tmp = SCARG(uap, data); 656 if (tmp != 0 && t->p_nlwps > 1) { 657 lwp_delref(lt); 658 mutex_enter(&t->p_smutex); 659 lt = lwp_find(t, tmp); 660 if (lt == NULL) { 661 mutex_exit(&t->p_smutex); 662 error = ESRCH; 663 break; 664 } 665 lwp_addref(lt); 666 mutex_exit(&t->p_smutex); 667 } 668 if (!process_validregs(lt)) 669 error = EINVAL; 670 else { 671 error = proc_vmspace_getref(l->l_proc, &vm); 672 if (error) 673 break; 674 iov.iov_base = SCARG(uap, addr); 675 iov.iov_len = sizeof(struct reg); 676 uio.uio_iov = &iov; 677 uio.uio_iovcnt = 1; 678 uio.uio_offset = 0; 679 uio.uio_resid = sizeof(struct reg); 680 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 681 uio.uio_vmspace = vm; 682 683 error = process_doregs(l, lt, &uio); 684 uvmspace_free(vm); 685 } 686 break; 687 #endif 688 689 #ifdef PT_SETFPREGS 690 case PT_SETFPREGS: 691 write = 1; 692 #endif 693 #ifdef PT_GETFPREGS 694 case PT_GETFPREGS: 695 /* write = 0 done above. */ 696 #endif 697 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 698 tmp = SCARG(uap, data); 699 if (tmp != 0 && t->p_nlwps > 1) { 700 lwp_delref(lt); 701 mutex_enter(&t->p_smutex); 702 lt = lwp_find(t, tmp); 703 if (lt == NULL) { 704 mutex_exit(&t->p_smutex); 705 error = ESRCH; 706 break; 707 } 708 lwp_addref(lt); 709 mutex_exit(&t->p_smutex); 710 } 711 if (!process_validfpregs(lt)) 712 error = EINVAL; 713 else { 714 error = proc_vmspace_getref(l->l_proc, &vm); 715 if (error) 716 break; 717 iov.iov_base = SCARG(uap, addr); 718 iov.iov_len = sizeof(struct fpreg); 719 uio.uio_iov = &iov; 720 uio.uio_iovcnt = 1; 721 uio.uio_offset = 0; 722 uio.uio_resid = sizeof(struct fpreg); 723 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 724 uio.uio_vmspace = vm; 725 726 error = process_dofpregs(l, lt, &uio); 727 uvmspace_free(vm); 728 } 729 break; 730 #endif 731 732 #ifdef __HAVE_PTRACE_MACHDEP 733 PTRACE_MACHDEP_REQUEST_CASES 734 error = ptrace_machdep_dorequest(l, lt, 735 req, SCARG(uap, addr), SCARG(uap, data)); 736 break; 737 #endif 738 } 739 740 if (lt != NULL) 741 lwp_delref(lt); 742 743 if (pheld) { 744 proc_delref(t); 745 mutex_exit(&t->p_mutex); 746 rw_exit(&proclist_lock); 747 } else { 748 mutex_enter(&t->p_mutex); 749 proc_delref(t); 750 mutex_exit(&t->p_mutex); 751 } 752 753 return error; 754 } 755 756 int 757 process_doregs(struct lwp *curl /*tracer*/, 758 struct lwp *l /*traced*/, 759 struct uio *uio) 760 { 761 #if defined(PT_GETREGS) || defined(PT_SETREGS) 762 int error; 763 struct reg r; 764 char *kv; 765 int kl; 766 767 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r)) 768 return EINVAL; 769 770 kl = sizeof(r); 771 kv = (char *)&r; 772 773 kv += uio->uio_offset; 774 kl -= uio->uio_offset; 775 if ((size_t)kl > uio->uio_resid) 776 kl = uio->uio_resid; 777 778 PHOLD(l); 779 780 error = process_read_regs(l, &r); 781 if (error == 0) 782 error = uiomove(kv, kl, uio); 783 if (error == 0 && uio->uio_rw == UIO_WRITE) { 784 if (l->l_stat != LSSTOP) 785 error = EBUSY; 786 else 787 error = process_write_regs(l, &r); 788 } 789 790 PRELE(l); 791 792 uio->uio_offset = 0; 793 return (error); 794 #else 795 return (EINVAL); 796 #endif 797 } 798 799 int 800 process_validregs(struct lwp *l) 801 { 802 803 #if defined(PT_SETREGS) || defined(PT_GETREGS) 804 return ((l->l_flag & LW_SYSTEM) == 0); 805 #else 806 return (0); 807 #endif 808 } 809 810 int 811 process_dofpregs(struct lwp *curl /*tracer*/, 812 struct lwp *l /*traced*/, 813 struct uio *uio) 814 { 815 #if defined(PT_GETFPREGS) || defined(PT_SETFPREGS) 816 int error; 817 struct fpreg r; 818 char *kv; 819 int kl; 820 821 if (uio->uio_offset < 0 || uio->uio_offset > (off_t)sizeof(r)) 822 return EINVAL; 823 824 kl = sizeof(r); 825 kv = (char *)&r; 826 827 kv += uio->uio_offset; 828 kl -= uio->uio_offset; 829 if ((size_t)kl > uio->uio_resid) 830 kl = uio->uio_resid; 831 832 PHOLD(l); 833 834 error = process_read_fpregs(l, &r); 835 if (error == 0) 836 error = uiomove(kv, kl, uio); 837 if (error == 0 && uio->uio_rw == UIO_WRITE) { 838 if (l->l_stat != LSSTOP) 839 error = EBUSY; 840 else 841 error = process_write_fpregs(l, &r); 842 } 843 844 PRELE(l); 845 846 uio->uio_offset = 0; 847 return (error); 848 #else 849 return (EINVAL); 850 #endif 851 } 852 853 int 854 process_validfpregs(struct lwp *l) 855 { 856 857 #if defined(PT_SETFPREGS) || defined(PT_GETFPREGS) 858 return ((l->l_flag & LW_SYSTEM) == 0); 859 #else 860 return (0); 861 #endif 862 } 863 #endif /* PTRACE */ 864 865 #if defined(KTRACE) || defined(PTRACE) || defined(SYSTRACE) 866 int 867 process_domem(struct lwp *curl /*tracer*/, 868 struct lwp *l /*traced*/, 869 struct uio *uio) 870 { 871 struct proc *p = l->l_proc; /* traced */ 872 struct vmspace *vm; 873 int error; 874 875 size_t len; 876 #ifdef PMAP_NEED_PROCWR 877 vaddr_t addr; 878 #endif 879 880 error = 0; 881 len = uio->uio_resid; 882 883 if (len == 0) 884 return (0); 885 886 #ifdef PMAP_NEED_PROCWR 887 addr = uio->uio_offset; 888 #endif 889 890 vm = p->p_vmspace; 891 892 simple_lock(&vm->vm_map.ref_lock); 893 if ((l->l_flag & LW_WEXIT) || vm->vm_refcnt < 1) 894 error = EFAULT; 895 if (error == 0) 896 p->p_vmspace->vm_refcnt++; /* XXX */ 897 simple_unlock(&vm->vm_map.ref_lock); 898 if (error != 0) 899 return (error); 900 error = uvm_io(&vm->vm_map, uio); 901 uvmspace_free(vm); 902 903 #ifdef PMAP_NEED_PROCWR 904 if (error == 0 && uio->uio_rw == UIO_WRITE) 905 pmap_procwr(p, addr, len); 906 #endif 907 return (error); 908 } 909 #endif /* KTRACE || PTRACE || SYSTRACE */ 910 911 #if defined(KTRACE) || defined(PTRACE) 912 void 913 process_stoptrace(struct lwp *l) 914 { 915 struct proc *p = l->l_proc, *pp; 916 917 mutex_enter(&proclist_mutex); 918 mutex_enter(&p->p_smutex); 919 pp = p->p_pptr; 920 if (pp->p_pid == 1) { 921 CLR(p->p_slflag, PSL_SYSCALL); /* XXXSMP */ 922 mutex_exit(&p->p_smutex); 923 mutex_exit(&proclist_mutex); 924 return; 925 } 926 927 p->p_xstat = SIGTRAP; 928 proc_stop(p, 1, SIGSTOP); 929 KERNEL_UNLOCK_ALL(l, &l->l_biglocks); 930 mutex_exit(&p->p_smutex); 931 mutex_exit(&proclist_mutex); 932 lwp_lock(l); 933 mi_switch(l, NULL); 934 KERNEL_LOCK(l->l_biglocks, l); 935 } 936 #endif /* KTRACE || PTRACE */ 937