1 /*- 2 * Copyright (c) 1994, Sean Eric Fagan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Sean Eric Fagan. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_compat.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/syscallsubr.h> 42 #include <sys/sysent.h> 43 #include <sys/sysproto.h> 44 #include <sys/proc.h> 45 #include <sys/vnode.h> 46 #include <sys/ptrace.h> 47 #include <sys/sx.h> 48 #include <sys/malloc.h> 49 #include <sys/signalvar.h> 50 51 #include <machine/reg.h> 52 53 #include <security/audit/audit.h> 54 55 #include <vm/vm.h> 56 #include <vm/pmap.h> 57 #include <vm/vm_extern.h> 58 #include <vm/vm_map.h> 59 #include <vm/vm_kern.h> 60 #include <vm/vm_object.h> 61 #include <vm/vm_page.h> 62 #include <vm/vm_param.h> 63 64 #ifdef COMPAT_IA32 65 #include <sys/procfs.h> 66 #include <machine/fpu.h> 67 #include <compat/ia32/ia32_reg.h> 68 69 struct ptrace_io_desc32 { 70 int piod_op; 71 u_int32_t piod_offs; 72 u_int32_t piod_addr; 73 u_int32_t piod_len; 74 }; 75 #endif 76 77 /* 78 * Functions implemented using PROC_ACTION(): 79 * 80 * proc_read_regs(proc, regs) 81 * Get the current user-visible register set from the process 82 * and copy it into the regs structure (<machine/reg.h>). 83 * The process is stopped at the time read_regs is called. 84 * 85 * proc_write_regs(proc, regs) 86 * Update the current register set from the passed in regs 87 * structure. Take care to avoid clobbering special CPU 88 * registers or privileged bits in the PSL. 89 * Depending on the architecture this may have fix-up work to do, 90 * especially if the IAR or PCW are modified. 91 * The process is stopped at the time write_regs is called. 92 * 93 * proc_read_fpregs, proc_write_fpregs 94 * deal with the floating point register set, otherwise as above. 95 * 96 * proc_read_dbregs, proc_write_dbregs 97 * deal with the processor debug register set, otherwise as above. 98 * 99 * proc_sstep(proc) 100 * Arrange for the process to trap after executing a single instruction. 101 */ 102 103 #define PROC_ACTION(action) do { \ 104 int error; \ 105 \ 106 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 107 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 108 error = EIO; \ 109 else \ 110 error = (action); \ 111 return (error); \ 112 } while(0) 113 114 int 115 proc_read_regs(struct thread *td, struct reg *regs) 116 { 117 118 PROC_ACTION(fill_regs(td, regs)); 119 } 120 121 int 122 proc_write_regs(struct thread *td, struct reg *regs) 123 { 124 125 PROC_ACTION(set_regs(td, regs)); 126 } 127 128 int 129 proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 130 { 131 132 PROC_ACTION(fill_dbregs(td, dbregs)); 133 } 134 135 int 136 proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 137 { 138 139 PROC_ACTION(set_dbregs(td, dbregs)); 140 } 141 142 /* 143 * Ptrace doesn't support fpregs at all, and there are no security holes 144 * or translations for fpregs, so we can just copy them. 145 */ 146 int 147 proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 148 { 149 150 PROC_ACTION(fill_fpregs(td, fpregs)); 151 } 152 153 int 154 proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 155 { 156 157 PROC_ACTION(set_fpregs(td, fpregs)); 158 } 159 160 #ifdef COMPAT_IA32 161 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 162 int 163 proc_read_regs32(struct thread *td, struct reg32 *regs32) 164 { 165 166 PROC_ACTION(fill_regs32(td, regs32)); 167 } 168 169 int 170 proc_write_regs32(struct thread *td, struct reg32 *regs32) 171 { 172 173 PROC_ACTION(set_regs32(td, regs32)); 174 } 175 176 int 177 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 178 { 179 180 PROC_ACTION(fill_dbregs32(td, dbregs32)); 181 } 182 183 int 184 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 185 { 186 187 PROC_ACTION(set_dbregs32(td, dbregs32)); 188 } 189 190 int 191 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 192 { 193 194 PROC_ACTION(fill_fpregs32(td, fpregs32)); 195 } 196 197 int 198 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 199 { 200 201 PROC_ACTION(set_fpregs32(td, fpregs32)); 202 } 203 #endif 204 205 int 206 proc_sstep(struct thread *td) 207 { 208 209 PROC_ACTION(ptrace_single_step(td)); 210 } 211 212 int 213 proc_rwmem(struct proc *p, struct uio *uio) 214 { 215 vm_map_t map; 216 vm_object_t backing_object, object = NULL; 217 vm_offset_t pageno = 0; /* page number */ 218 vm_prot_t reqprot; 219 int error, fault_flags, writing; 220 221 /* 222 * Assert that someone has locked this vmspace. (Should be 223 * curthread but we can't assert that.) This keeps the process 224 * from exiting out from under us until this operation completes. 225 */ 226 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__, 227 p, p->p_pid)); 228 229 /* 230 * The map we want... 231 */ 232 map = &p->p_vmspace->vm_map; 233 234 writing = uio->uio_rw == UIO_WRITE; 235 reqprot = writing ? (VM_PROT_WRITE | VM_PROT_OVERRIDE_WRITE) : 236 VM_PROT_READ; 237 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 238 239 /* 240 * Only map in one page at a time. We don't have to, but it 241 * makes things easier. This way is trivial - right? 242 */ 243 do { 244 vm_map_t tmap; 245 vm_offset_t uva; 246 int page_offset; /* offset into page */ 247 vm_map_entry_t out_entry; 248 vm_prot_t out_prot; 249 boolean_t wired; 250 vm_pindex_t pindex; 251 u_int len; 252 vm_page_t m; 253 254 object = NULL; 255 256 uva = (vm_offset_t)uio->uio_offset; 257 258 /* 259 * Get the page number of this segment. 260 */ 261 pageno = trunc_page(uva); 262 page_offset = uva - pageno; 263 264 /* 265 * How many bytes to copy 266 */ 267 len = min(PAGE_SIZE - page_offset, uio->uio_resid); 268 269 /* 270 * Fault the page on behalf of the process 271 */ 272 error = vm_fault(map, pageno, reqprot, fault_flags); 273 if (error) { 274 if (error == KERN_RESOURCE_SHORTAGE) 275 error = ENOMEM; 276 else 277 error = EFAULT; 278 break; 279 } 280 281 /* 282 * Now we need to get the page. out_entry, out_prot, wired, 283 * and single_use aren't used. One would think the vm code 284 * would be a *bit* nicer... We use tmap because 285 * vm_map_lookup() can change the map argument. 286 */ 287 tmap = map; 288 error = vm_map_lookup(&tmap, pageno, reqprot, &out_entry, 289 &object, &pindex, &out_prot, &wired); 290 if (error) { 291 error = EFAULT; 292 break; 293 } 294 VM_OBJECT_LOCK(object); 295 while ((m = vm_page_lookup(object, pindex)) == NULL && 296 !writing && 297 (backing_object = object->backing_object) != NULL) { 298 /* 299 * Allow fallback to backing objects if we are reading. 300 */ 301 VM_OBJECT_LOCK(backing_object); 302 pindex += OFF_TO_IDX(object->backing_object_offset); 303 VM_OBJECT_UNLOCK(object); 304 object = backing_object; 305 } 306 VM_OBJECT_UNLOCK(object); 307 if (m == NULL) { 308 vm_map_lookup_done(tmap, out_entry); 309 error = EFAULT; 310 break; 311 } 312 313 /* 314 * Hold the page in memory. 315 */ 316 vm_page_lock_queues(); 317 vm_page_hold(m); 318 vm_page_unlock_queues(); 319 320 /* 321 * We're done with tmap now. 322 */ 323 vm_map_lookup_done(tmap, out_entry); 324 325 /* 326 * Now do the i/o move. 327 */ 328 error = uiomove_fromphys(&m, page_offset, len, uio); 329 330 /* 331 * Release the page. 332 */ 333 vm_page_lock_queues(); 334 vm_page_unhold(m); 335 vm_page_unlock_queues(); 336 337 } while (error == 0 && uio->uio_resid > 0); 338 339 return (error); 340 } 341 342 /* 343 * Process debugging system call. 344 */ 345 #ifndef _SYS_SYSPROTO_H_ 346 struct ptrace_args { 347 int req; 348 pid_t pid; 349 caddr_t addr; 350 int data; 351 }; 352 #endif 353 354 #ifdef COMPAT_IA32 355 /* 356 * This CPP subterfuge is to try and reduce the number of ifdefs in 357 * the body of the code. 358 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 359 * becomes either: 360 * copyin(uap->addr, &r.reg, sizeof r.reg); 361 * or 362 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 363 * .. except this is done at runtime. 364 */ 365 #define COPYIN(u, k, s) wrap32 ? \ 366 copyin(u, k ## 32, s ## 32) : \ 367 copyin(u, k, s) 368 #define COPYOUT(k, u, s) wrap32 ? \ 369 copyout(k ## 32, u, s ## 32) : \ 370 copyout(k, u, s) 371 #else 372 #define COPYIN(u, k, s) copyin(u, k, s) 373 #define COPYOUT(k, u, s) copyout(k, u, s) 374 #endif 375 int 376 ptrace(struct thread *td, struct ptrace_args *uap) 377 { 378 /* 379 * XXX this obfuscation is to reduce stack usage, but the register 380 * structs may be too large to put on the stack anyway. 381 */ 382 union { 383 struct ptrace_io_desc piod; 384 struct ptrace_lwpinfo pl; 385 struct dbreg dbreg; 386 struct fpreg fpreg; 387 struct reg reg; 388 #ifdef COMPAT_IA32 389 struct dbreg32 dbreg32; 390 struct fpreg32 fpreg32; 391 struct reg32 reg32; 392 struct ptrace_io_desc32 piod32; 393 #endif 394 } r; 395 void *addr; 396 int error = 0; 397 #ifdef COMPAT_IA32 398 int wrap32 = 0; 399 400 if (SV_CURPROC_FLAG(SV_ILP32)) 401 wrap32 = 1; 402 #endif 403 AUDIT_ARG_PID(uap->pid); 404 AUDIT_ARG_CMD(uap->req); 405 AUDIT_ARG_ADDR(uap->addr); 406 AUDIT_ARG_VALUE(uap->data); 407 addr = &r; 408 switch (uap->req) { 409 case PT_GETREGS: 410 case PT_GETFPREGS: 411 case PT_GETDBREGS: 412 case PT_LWPINFO: 413 break; 414 case PT_SETREGS: 415 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 416 break; 417 case PT_SETFPREGS: 418 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 419 break; 420 case PT_SETDBREGS: 421 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 422 break; 423 case PT_IO: 424 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 425 break; 426 default: 427 addr = uap->addr; 428 break; 429 } 430 if (error) 431 return (error); 432 433 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 434 if (error) 435 return (error); 436 437 switch (uap->req) { 438 case PT_IO: 439 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 440 break; 441 case PT_GETREGS: 442 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 443 break; 444 case PT_GETFPREGS: 445 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 446 break; 447 case PT_GETDBREGS: 448 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 449 break; 450 case PT_LWPINFO: 451 error = copyout(&r.pl, uap->addr, uap->data); 452 break; 453 } 454 455 return (error); 456 } 457 #undef COPYIN 458 #undef COPYOUT 459 460 #ifdef COMPAT_IA32 461 /* 462 * PROC_READ(regs, td2, addr); 463 * becomes either: 464 * proc_read_regs(td2, addr); 465 * or 466 * proc_read_regs32(td2, addr); 467 * .. except this is done at runtime. There is an additional 468 * complication in that PROC_WRITE disallows 32 bit consumers 469 * from writing to 64 bit address space targets. 470 */ 471 #define PROC_READ(w, t, a) wrap32 ? \ 472 proc_read_ ## w ## 32(t, a) : \ 473 proc_read_ ## w (t, a) 474 #define PROC_WRITE(w, t, a) wrap32 ? \ 475 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 476 proc_write_ ## w (t, a) 477 #else 478 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 479 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 480 #endif 481 482 int 483 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 484 { 485 struct iovec iov; 486 struct uio uio; 487 struct proc *curp, *p, *pp; 488 struct thread *td2 = NULL; 489 struct ptrace_io_desc *piod = NULL; 490 struct ptrace_lwpinfo *pl; 491 int error, write, tmp, num; 492 int proctree_locked = 0; 493 lwpid_t tid = 0, *buf; 494 #ifdef COMPAT_IA32 495 int wrap32 = 0, safe = 0; 496 struct ptrace_io_desc32 *piod32 = NULL; 497 #endif 498 499 curp = td->td_proc; 500 501 /* Lock proctree before locking the process. */ 502 switch (req) { 503 case PT_TRACE_ME: 504 case PT_ATTACH: 505 case PT_STEP: 506 case PT_CONTINUE: 507 case PT_TO_SCE: 508 case PT_TO_SCX: 509 case PT_SYSCALL: 510 case PT_DETACH: 511 sx_xlock(&proctree_lock); 512 proctree_locked = 1; 513 break; 514 default: 515 break; 516 } 517 518 write = 0; 519 if (req == PT_TRACE_ME) { 520 p = td->td_proc; 521 PROC_LOCK(p); 522 } else { 523 if (pid <= PID_MAX) { 524 if ((p = pfind(pid)) == NULL) { 525 if (proctree_locked) 526 sx_xunlock(&proctree_lock); 527 return (ESRCH); 528 } 529 } else { 530 /* this is slow, should be optimized */ 531 sx_slock(&allproc_lock); 532 FOREACH_PROC_IN_SYSTEM(p) { 533 PROC_LOCK(p); 534 FOREACH_THREAD_IN_PROC(p, td2) { 535 if (td2->td_tid == pid) 536 break; 537 } 538 if (td2 != NULL) 539 break; /* proc lock held */ 540 PROC_UNLOCK(p); 541 } 542 sx_sunlock(&allproc_lock); 543 if (p == NULL) { 544 if (proctree_locked) 545 sx_xunlock(&proctree_lock); 546 return (ESRCH); 547 } 548 tid = pid; 549 pid = p->p_pid; 550 } 551 } 552 AUDIT_ARG_PROCESS(p); 553 554 if ((p->p_flag & P_WEXIT) != 0) { 555 error = ESRCH; 556 goto fail; 557 } 558 if ((error = p_cansee(td, p)) != 0) 559 goto fail; 560 561 if ((error = p_candebug(td, p)) != 0) 562 goto fail; 563 564 /* 565 * System processes can't be debugged. 566 */ 567 if ((p->p_flag & P_SYSTEM) != 0) { 568 error = EINVAL; 569 goto fail; 570 } 571 572 if (tid == 0) { 573 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 574 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 575 td2 = p->p_xthread; 576 } else { 577 td2 = FIRST_THREAD_IN_PROC(p); 578 } 579 tid = td2->td_tid; 580 } 581 582 #ifdef COMPAT_IA32 583 /* 584 * Test if we're a 32 bit client and what the target is. 585 * Set the wrap controls accordingly. 586 */ 587 if (SV_CURPROC_FLAG(SV_ILP32)) { 588 if (td2->td_proc->p_sysent->sv_flags & SV_ILP32) 589 safe = 1; 590 wrap32 = 1; 591 } 592 #endif 593 /* 594 * Permissions check 595 */ 596 switch (req) { 597 case PT_TRACE_ME: 598 /* Always legal. */ 599 break; 600 601 case PT_ATTACH: 602 /* Self */ 603 if (p->p_pid == td->td_proc->p_pid) { 604 error = EINVAL; 605 goto fail; 606 } 607 608 /* Already traced */ 609 if (p->p_flag & P_TRACED) { 610 error = EBUSY; 611 goto fail; 612 } 613 614 /* Can't trace an ancestor if you're being traced. */ 615 if (curp->p_flag & P_TRACED) { 616 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 617 if (pp == p) { 618 error = EINVAL; 619 goto fail; 620 } 621 } 622 } 623 624 625 /* OK */ 626 break; 627 628 case PT_CLEARSTEP: 629 /* Allow thread to clear single step for itself */ 630 if (td->td_tid == tid) 631 break; 632 633 /* FALLTHROUGH */ 634 default: 635 /* not being traced... */ 636 if ((p->p_flag & P_TRACED) == 0) { 637 error = EPERM; 638 goto fail; 639 } 640 641 /* not being traced by YOU */ 642 if (p->p_pptr != td->td_proc) { 643 error = EBUSY; 644 goto fail; 645 } 646 647 /* not currently stopped */ 648 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 || 649 p->p_suspcount != p->p_numthreads || 650 (p->p_flag & P_WAITED) == 0) { 651 error = EBUSY; 652 goto fail; 653 } 654 655 if ((p->p_flag & P_STOPPED_TRACE) == 0) { 656 static int count = 0; 657 if (count++ == 0) 658 printf("P_STOPPED_TRACE not set.\n"); 659 } 660 661 /* OK */ 662 break; 663 } 664 665 /* Keep this process around until we finish this request. */ 666 _PHOLD(p); 667 668 #ifdef FIX_SSTEP 669 /* 670 * Single step fixup ala procfs 671 */ 672 FIX_SSTEP(td2); 673 #endif 674 675 /* 676 * Actually do the requests 677 */ 678 679 td->td_retval[0] = 0; 680 681 switch (req) { 682 case PT_TRACE_ME: 683 /* set my trace flag and "owner" so it can read/write me */ 684 p->p_flag |= P_TRACED; 685 p->p_oppid = p->p_pptr->p_pid; 686 break; 687 688 case PT_ATTACH: 689 /* security check done above */ 690 p->p_flag |= P_TRACED; 691 p->p_oppid = p->p_pptr->p_pid; 692 if (p->p_pptr != td->td_proc) 693 proc_reparent(p, td->td_proc); 694 data = SIGSTOP; 695 goto sendsig; /* in PT_CONTINUE below */ 696 697 case PT_CLEARSTEP: 698 error = ptrace_clear_single_step(td2); 699 break; 700 701 case PT_SETSTEP: 702 error = ptrace_single_step(td2); 703 break; 704 705 case PT_SUSPEND: 706 td2->td_dbgflags |= TDB_SUSPEND; 707 thread_lock(td2); 708 td2->td_flags |= TDF_NEEDSUSPCHK; 709 thread_unlock(td2); 710 break; 711 712 case PT_RESUME: 713 td2->td_dbgflags &= ~TDB_SUSPEND; 714 break; 715 716 case PT_STEP: 717 case PT_CONTINUE: 718 case PT_TO_SCE: 719 case PT_TO_SCX: 720 case PT_SYSCALL: 721 case PT_DETACH: 722 /* Zero means do not send any signal */ 723 if (data < 0 || data > _SIG_MAXSIG) { 724 error = EINVAL; 725 break; 726 } 727 728 switch (req) { 729 case PT_STEP: 730 error = ptrace_single_step(td2); 731 if (error) 732 goto out; 733 break; 734 case PT_TO_SCE: 735 p->p_stops |= S_PT_SCE; 736 break; 737 case PT_TO_SCX: 738 p->p_stops |= S_PT_SCX; 739 break; 740 case PT_SYSCALL: 741 p->p_stops |= S_PT_SCE | S_PT_SCX; 742 break; 743 } 744 745 if (addr != (void *)1) { 746 error = ptrace_set_pc(td2, (u_long)(uintfptr_t)addr); 747 if (error) 748 break; 749 } 750 751 if (req == PT_DETACH) { 752 /* reset process parent */ 753 if (p->p_oppid != p->p_pptr->p_pid) { 754 struct proc *pp; 755 756 PROC_LOCK(p->p_pptr); 757 sigqueue_take(p->p_ksi); 758 PROC_UNLOCK(p->p_pptr); 759 760 PROC_UNLOCK(p); 761 pp = pfind(p->p_oppid); 762 if (pp == NULL) 763 pp = initproc; 764 else 765 PROC_UNLOCK(pp); 766 PROC_LOCK(p); 767 proc_reparent(p, pp); 768 if (pp == initproc) 769 p->p_sigparent = SIGCHLD; 770 } 771 p->p_flag &= ~(P_TRACED | P_WAITED); 772 p->p_oppid = 0; 773 774 /* should we send SIGCHLD? */ 775 /* childproc_continued(p); */ 776 } 777 778 sendsig: 779 if (proctree_locked) { 780 sx_xunlock(&proctree_lock); 781 proctree_locked = 0; 782 } 783 p->p_xstat = data; 784 p->p_xthread = NULL; 785 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) { 786 /* deliver or queue signal */ 787 td2->td_dbgflags &= ~TDB_XSIG; 788 td2->td_xsig = data; 789 790 if (req == PT_DETACH) { 791 struct thread *td3; 792 FOREACH_THREAD_IN_PROC(p, td3) { 793 td3->td_dbgflags &= ~TDB_SUSPEND; 794 } 795 } 796 /* 797 * unsuspend all threads, to not let a thread run, 798 * you should use PT_SUSPEND to suspend it before 799 * continuing process. 800 */ 801 PROC_SLOCK(p); 802 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED); 803 thread_unsuspend(p); 804 PROC_SUNLOCK(p); 805 } else { 806 if (data) 807 psignal(p, data); 808 } 809 break; 810 811 case PT_WRITE_I: 812 case PT_WRITE_D: 813 write = 1; 814 /* FALLTHROUGH */ 815 case PT_READ_I: 816 case PT_READ_D: 817 PROC_UNLOCK(p); 818 tmp = 0; 819 /* write = 0 set above */ 820 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp; 821 iov.iov_len = sizeof(int); 822 uio.uio_iov = &iov; 823 uio.uio_iovcnt = 1; 824 uio.uio_offset = (off_t)(uintptr_t)addr; 825 uio.uio_resid = sizeof(int); 826 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */ 827 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 828 uio.uio_td = td; 829 error = proc_rwmem(p, &uio); 830 if (uio.uio_resid != 0) { 831 /* 832 * XXX proc_rwmem() doesn't currently return ENOSPC, 833 * so I think write() can bogusly return 0. 834 * XXX what happens for short writes? We don't want 835 * to write partial data. 836 * XXX proc_rwmem() returns EPERM for other invalid 837 * addresses. Convert this to EINVAL. Does this 838 * clobber returns of EPERM for other reasons? 839 */ 840 if (error == 0 || error == ENOSPC || error == EPERM) 841 error = EINVAL; /* EOF */ 842 } 843 if (!write) 844 td->td_retval[0] = tmp; 845 PROC_LOCK(p); 846 break; 847 848 case PT_IO: 849 #ifdef COMPAT_IA32 850 if (wrap32) { 851 piod32 = addr; 852 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 853 iov.iov_len = piod32->piod_len; 854 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 855 uio.uio_resid = piod32->piod_len; 856 } else 857 #endif 858 { 859 piod = addr; 860 iov.iov_base = piod->piod_addr; 861 iov.iov_len = piod->piod_len; 862 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 863 uio.uio_resid = piod->piod_len; 864 } 865 uio.uio_iov = &iov; 866 uio.uio_iovcnt = 1; 867 uio.uio_segflg = UIO_USERSPACE; 868 uio.uio_td = td; 869 #ifdef COMPAT_IA32 870 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 871 #else 872 tmp = piod->piod_op; 873 #endif 874 switch (tmp) { 875 case PIOD_READ_D: 876 case PIOD_READ_I: 877 uio.uio_rw = UIO_READ; 878 break; 879 case PIOD_WRITE_D: 880 case PIOD_WRITE_I: 881 uio.uio_rw = UIO_WRITE; 882 break; 883 default: 884 error = EINVAL; 885 goto out; 886 } 887 PROC_UNLOCK(p); 888 error = proc_rwmem(p, &uio); 889 #ifdef COMPAT_IA32 890 if (wrap32) 891 piod32->piod_len -= uio.uio_resid; 892 else 893 #endif 894 piod->piod_len -= uio.uio_resid; 895 PROC_LOCK(p); 896 break; 897 898 case PT_KILL: 899 data = SIGKILL; 900 goto sendsig; /* in PT_CONTINUE above */ 901 902 case PT_SETREGS: 903 error = PROC_WRITE(regs, td2, addr); 904 break; 905 906 case PT_GETREGS: 907 error = PROC_READ(regs, td2, addr); 908 break; 909 910 case PT_SETFPREGS: 911 error = PROC_WRITE(fpregs, td2, addr); 912 break; 913 914 case PT_GETFPREGS: 915 error = PROC_READ(fpregs, td2, addr); 916 break; 917 918 case PT_SETDBREGS: 919 error = PROC_WRITE(dbregs, td2, addr); 920 break; 921 922 case PT_GETDBREGS: 923 error = PROC_READ(dbregs, td2, addr); 924 break; 925 926 case PT_LWPINFO: 927 if (data <= 0 || data > sizeof(*pl)) { 928 error = EINVAL; 929 break; 930 } 931 pl = addr; 932 pl->pl_lwpid = td2->td_tid; 933 if (td2->td_dbgflags & TDB_XSIG) 934 pl->pl_event = PL_EVENT_SIGNAL; 935 else 936 pl->pl_event = 0; 937 pl->pl_flags = 0; 938 pl->pl_sigmask = td2->td_sigmask; 939 pl->pl_siglist = td2->td_siglist; 940 break; 941 942 case PT_GETNUMLWPS: 943 td->td_retval[0] = p->p_numthreads; 944 break; 945 946 case PT_GETLWPLIST: 947 if (data <= 0) { 948 error = EINVAL; 949 break; 950 } 951 num = imin(p->p_numthreads, data); 952 PROC_UNLOCK(p); 953 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 954 tmp = 0; 955 PROC_LOCK(p); 956 FOREACH_THREAD_IN_PROC(p, td2) { 957 if (tmp >= num) 958 break; 959 buf[tmp++] = td2->td_tid; 960 } 961 PROC_UNLOCK(p); 962 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 963 free(buf, M_TEMP); 964 if (!error) 965 td->td_retval[0] = tmp; 966 PROC_LOCK(p); 967 break; 968 969 default: 970 #ifdef __HAVE_PTRACE_MACHDEP 971 if (req >= PT_FIRSTMACH) { 972 PROC_UNLOCK(p); 973 error = cpu_ptrace(td2, req, addr, data); 974 PROC_LOCK(p); 975 } else 976 #endif 977 /* Unknown request. */ 978 error = EINVAL; 979 break; 980 } 981 982 out: 983 /* Drop our hold on this process now that the request has completed. */ 984 _PRELE(p); 985 fail: 986 PROC_UNLOCK(p); 987 if (proctree_locked) 988 sx_xunlock(&proctree_lock); 989 return (error); 990 } 991 #undef PROC_READ 992 #undef PROC_WRITE 993 994 /* 995 * Stop a process because of a debugging event; 996 * stay stopped until p->p_step is cleared 997 * (cleared by PIOCCONT in procfs). 998 */ 999 void 1000 stopevent(struct proc *p, unsigned int event, unsigned int val) 1001 { 1002 1003 PROC_LOCK_ASSERT(p, MA_OWNED); 1004 p->p_step = 1; 1005 do { 1006 p->p_xstat = val; 1007 p->p_xthread = NULL; 1008 p->p_stype = event; /* Which event caused the stop? */ 1009 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1010 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1011 } while (p->p_step); 1012 } 1013