1 /*- 2 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1994, Sean Eric Fagan 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Sean Eric Fagan. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/imgact.h> 37 #include <sys/ktr.h> 38 #include <sys/limits.h> 39 #include <sys/lock.h> 40 #include <sys/mman.h> 41 #include <sys/mutex.h> 42 #include <sys/reg.h> 43 #include <sys/sleepqueue.h> 44 #include <sys/syscallsubr.h> 45 #include <sys/sysent.h> 46 #include <sys/sysproto.h> 47 #include <sys/priv.h> 48 #include <sys/proc.h> 49 #include <sys/vnode.h> 50 #include <sys/ptrace.h> 51 #include <sys/rwlock.h> 52 #include <sys/sx.h> 53 #include <sys/malloc.h> 54 #include <sys/signalvar.h> 55 #include <sys/caprights.h> 56 #include <sys/filedesc.h> 57 58 #include <security/audit/audit.h> 59 60 #include <vm/vm.h> 61 #include <vm/pmap.h> 62 #include <vm/vm_extern.h> 63 #include <vm/vm_map.h> 64 #include <vm/vm_kern.h> 65 #include <vm/vm_object.h> 66 #include <vm/vm_page.h> 67 #include <vm/vm_param.h> 68 69 #ifdef COMPAT_FREEBSD32 70 #include <sys/procfs.h> 71 #endif 72 73 /* Assert it's safe to unlock a process, e.g. to allocate working memory */ 74 #define PROC_ASSERT_TRACEREQ(p) MPASS(((p)->p_flag2 & P2_PTRACEREQ) != 0) 75 76 /* 77 * Functions implemented below: 78 * 79 * proc_read_regs(proc, regs) 80 * Get the current user-visible register set from the process 81 * and copy it into the regs structure (<machine/reg.h>). 82 * The process is stopped at the time read_regs is called. 83 * 84 * proc_write_regs(proc, regs) 85 * Update the current register set from the passed in regs 86 * structure. Take care to avoid clobbering special CPU 87 * registers or privileged bits in the PSL. 88 * Depending on the architecture this may have fix-up work to do, 89 * especially if the IAR or PCW are modified. 90 * The process is stopped at the time write_regs is called. 91 * 92 * proc_read_fpregs, proc_write_fpregs 93 * deal with the floating point register set, otherwise as above. 94 * 95 * proc_read_dbregs, proc_write_dbregs 96 * deal with the processor debug register set, otherwise as above. 97 * 98 * proc_sstep(proc) 99 * Arrange for the process to trap after executing a single instruction. 100 */ 101 102 int 103 proc_read_regs(struct thread *td, struct reg *regs) 104 { 105 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 106 return (fill_regs(td, regs)); 107 } 108 109 int 110 proc_write_regs(struct thread *td, struct reg *regs) 111 { 112 int error; 113 114 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 115 error = priv_check(curthread, PRIV_PROC_MEM_WRITE); 116 if (error != 0) 117 return (error); 118 return (set_regs(td, regs)); 119 } 120 121 int 122 proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 123 { 124 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 125 return (fill_dbregs(td, dbregs)); 126 } 127 128 int 129 proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 130 { 131 int error; 132 133 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 134 error = priv_check(curthread, PRIV_PROC_MEM_WRITE); 135 if (error != 0) 136 return (error); 137 return (set_dbregs(td, dbregs)); 138 } 139 140 /* 141 * Ptrace doesn't support fpregs at all, and there are no security holes 142 * or translations for fpregs, so we can just copy them. 143 */ 144 int 145 proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 146 { 147 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 148 return (fill_fpregs(td, fpregs)); 149 } 150 151 int 152 proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 153 { 154 int error; 155 156 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 157 error = priv_check(curthread, PRIV_PROC_MEM_WRITE); 158 if (error != 0) 159 return (error); 160 return (set_fpregs(td, fpregs)); 161 } 162 163 static struct regset * 164 proc_find_regset(struct thread *td, int note) 165 { 166 struct regset **regsetp, **regset_end, *regset; 167 struct sysentvec *sv; 168 169 sv = td->td_proc->p_sysent; 170 regsetp = sv->sv_regset_begin; 171 if (regsetp == NULL) 172 return (NULL); 173 regset_end = sv->sv_regset_end; 174 MPASS(regset_end != NULL); 175 for (; regsetp < regset_end; regsetp++) { 176 regset = *regsetp; 177 if (regset->note != note) 178 continue; 179 180 return (regset); 181 } 182 183 return (NULL); 184 } 185 186 static int 187 proc_read_regset(struct thread *td, int note, struct iovec *iov) 188 { 189 struct regset *regset; 190 struct proc *p; 191 void *buf; 192 size_t size; 193 int error; 194 195 regset = proc_find_regset(td, note); 196 if (regset == NULL) 197 return (EINVAL); 198 199 if (regset->get == NULL) 200 return (EINVAL); 201 202 size = regset->size; 203 /* 204 * The regset is dynamically sized, e.g. the size could change 205 * depending on the hardware, or may have a per-thread size. 206 */ 207 if (size == 0) { 208 if (!regset->get(regset, td, NULL, &size)) 209 return (EINVAL); 210 } 211 212 if (iov->iov_base == NULL) { 213 iov->iov_len = size; 214 if (iov->iov_len == 0) 215 return (EINVAL); 216 217 return (0); 218 } 219 220 /* The length is wrong, return an error */ 221 if (iov->iov_len != size) 222 return (EINVAL); 223 224 error = 0; 225 p = td->td_proc; 226 227 /* Drop the proc lock while allocating the temp buffer */ 228 PROC_ASSERT_TRACEREQ(p); 229 PROC_UNLOCK(p); 230 buf = malloc(size, M_TEMP, M_WAITOK); 231 PROC_LOCK(p); 232 233 if (!regset->get(regset, td, buf, &size)) { 234 error = EINVAL; 235 } else { 236 KASSERT(size == regset->size || regset->size == 0, 237 ("%s: Getter function changed the size", __func__)); 238 239 iov->iov_len = size; 240 PROC_UNLOCK(p); 241 error = copyout(buf, iov->iov_base, size); 242 PROC_LOCK(p); 243 } 244 245 free(buf, M_TEMP); 246 247 return (error); 248 } 249 250 static int 251 proc_write_regset(struct thread *td, int note, struct iovec *iov) 252 { 253 struct regset *regset; 254 struct proc *p; 255 void *buf; 256 size_t size; 257 int error; 258 259 regset = proc_find_regset(td, note); 260 if (regset == NULL) 261 return (EINVAL); 262 263 size = regset->size; 264 /* 265 * The regset is dynamically sized, e.g. the size could change 266 * depending on the hardware, or may have a per-thread size. 267 */ 268 if (size == 0) { 269 if (!regset->get(regset, td, NULL, &size)) 270 return (EINVAL); 271 } 272 273 /* The length is wrong, return an error */ 274 if (iov->iov_len != size) 275 return (EINVAL); 276 277 if (regset->set == NULL) 278 return (EINVAL); 279 280 error = priv_check(curthread, PRIV_PROC_MEM_WRITE); 281 if (error != 0) 282 return (error); 283 284 p = td->td_proc; 285 286 /* Drop the proc lock while allocating the temp buffer */ 287 PROC_ASSERT_TRACEREQ(p); 288 PROC_UNLOCK(p); 289 buf = malloc(size, M_TEMP, M_WAITOK); 290 error = copyin(iov->iov_base, buf, size); 291 PROC_LOCK(p); 292 293 if (error == 0) { 294 if (!regset->set(regset, td, buf, size)) { 295 error = EINVAL; 296 } 297 } 298 299 free(buf, M_TEMP); 300 301 return (error); 302 } 303 304 #ifdef COMPAT_FREEBSD32 305 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 306 int 307 proc_read_regs32(struct thread *td, struct reg32 *regs32) 308 { 309 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 310 return (fill_regs32(td, regs32)); 311 } 312 313 int 314 proc_write_regs32(struct thread *td, struct reg32 *regs32) 315 { 316 int error; 317 318 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 319 error = priv_check(curthread, PRIV_PROC_MEM_WRITE); 320 if (error != 0) 321 return (error); 322 return (set_regs32(td, regs32)); 323 } 324 325 int 326 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 327 { 328 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 329 return (fill_dbregs32(td, dbregs32)); 330 } 331 332 int 333 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 334 { 335 int error; 336 337 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 338 error = priv_check(curthread, PRIV_PROC_MEM_WRITE); 339 if (error != 0) 340 return (error); 341 return (set_dbregs32(td, dbregs32)); 342 } 343 344 int 345 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 346 { 347 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 348 return (fill_fpregs32(td, fpregs32)); 349 } 350 351 int 352 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 353 { 354 int error; 355 356 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 357 error = priv_check(curthread, PRIV_PROC_MEM_WRITE); 358 if (error != 0) 359 return (error); 360 return (set_fpregs32(td, fpregs32)); 361 } 362 #endif 363 364 int 365 proc_sstep(struct thread *td) 366 { 367 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); 368 return (ptrace_single_step(td)); 369 } 370 371 static int 372 proc_vmspace_check_access(struct thread *td, struct proc *p, int flags) 373 { 374 PROC_ASSERT_HELD(p); 375 if ((flags & PRVM_CHECK_DEBUG) != 0) 376 return (p_candebug(td, p)); 377 if ((flags & PRVM_CHECK_VISIBILITY) != 0) 378 return (p_cansee(td, p)); 379 return (0); 380 } 381 382 int 383 proc_vmspace_ref(struct thread *td, struct proc *p, int flags, 384 struct vmspace **vmp) 385 { 386 struct vmspace *vm; 387 int error; 388 389 MPASS((flags & ~(PRVM_BLOCK_EXEC | PRVM_CHECK_VISIBILITY | 390 PRVM_CHECK_DEBUG)) == 0); 391 MPASS((flags & (PRVM_CHECK_VISIBILITY | PRVM_CHECK_DEBUG)) != 392 (PRVM_CHECK_VISIBILITY | PRVM_CHECK_DEBUG)); 393 394 PROC_LOCK(p); 395 if (p != td->td_proc) { 396 PROC_ASSERT_HELD(p); 397 398 /* 399 * Make sure that the vmspace doesn't switch out from 400 * under us. 401 */ 402 if ((flags & PRVM_BLOCK_EXEC) != 0) { 403 for (;;) { 404 if (!execve_block(td, p)) { 405 PROC_LOCK(p); 406 continue; 407 } 408 error = proc_vmspace_check_access(td, p, flags); 409 if (error != 0) { 410 execve_unblock(td, p); 411 PROC_UNLOCK(p); 412 return (error); 413 } 414 break; 415 } 416 } else { 417 error = proc_vmspace_check_access(td, p, flags); 418 if (error != 0) { 419 PROC_UNLOCK(p); 420 return (error); 421 } 422 } 423 } 424 vm = vmspace_acquire_ref(p); 425 if (vm == NULL) { 426 if (p != td->td_proc && (flags & PRVM_BLOCK_EXEC) != 0) 427 execve_unblock(td, p); 428 PROC_UNLOCK(p); 429 return (ESRCH); 430 } 431 PROC_UNLOCK(p); 432 *vmp = vm; 433 return (0); 434 } 435 436 void 437 proc_vmspace_unref(struct thread *td, struct proc *p, int flags, 438 struct vmspace *vm) 439 { 440 vmspace_free(vm); 441 if (p != td->td_proc && (flags & PRVM_BLOCK_EXEC) != 0) { 442 PROC_LOCK(p); 443 PROC_ASSERT_HELD(p); 444 execve_unblock(td, p); 445 PROC_UNLOCK(p); 446 } 447 } 448 449 static int 450 vmspace_rwmem(struct vmspace *vm, struct uio *uio) 451 { 452 vm_map_t map; 453 vm_offset_t pageno; /* page number */ 454 vm_prot_t reqprot; 455 int error, fault_flags, page_offset, writing; 456 457 map = &vm->vm_map; 458 459 /* 460 * If we are writing, then we request vm_fault() to create a private 461 * copy of each page. Since these copies will not be writeable by the 462 * process, we must explicitly request that they be dirtied. 463 */ 464 writing = uio->uio_rw == UIO_WRITE; 465 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 466 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 467 468 if (writing) { 469 error = priv_check(curthread, PRIV_PROC_MEM_WRITE); 470 if (error != 0) 471 goto out; 472 } 473 474 /* 475 * Only map in one page at a time. We don't have to, but it 476 * makes things easier. This way is trivial - right? 477 */ 478 do { 479 vm_offset_t uva; 480 u_int len; 481 vm_page_t m; 482 483 uva = (vm_offset_t)uio->uio_offset; 484 485 /* 486 * Get the page number of this segment. 487 */ 488 pageno = trunc_page(uva); 489 page_offset = uva - pageno; 490 491 /* 492 * How many bytes to copy 493 */ 494 len = MIN(PAGE_SIZE - page_offset, uio->uio_resid); 495 496 /* 497 * Fault and hold the page on behalf of the process. 498 */ 499 error = vm_fault(map, pageno, reqprot, fault_flags, &m); 500 if (error != KERN_SUCCESS) { 501 if (error == KERN_RESOURCE_SHORTAGE) 502 error = ENOMEM; 503 else 504 error = EFAULT; 505 break; 506 } 507 508 /* 509 * Now do the i/o move. 510 */ 511 error = uiomove_fromphys(&m, page_offset, len, uio); 512 513 /* Make the I-cache coherent for breakpoints. */ 514 if (writing && error == 0) { 515 vm_map_lock_read(map); 516 if (vm_map_check_protection(map, pageno, pageno + 517 PAGE_SIZE, VM_PROT_EXECUTE)) 518 vm_sync_icache(map, uva, len); 519 vm_map_unlock_read(map); 520 } 521 522 /* 523 * Release the page. 524 */ 525 vm_page_unwire(m, PQ_ACTIVE); 526 527 } while (error == 0 && uio->uio_resid > 0); 528 529 out: 530 return (error); 531 } 532 533 int 534 proc_rwmem(struct proc *p, struct uio *uio, int flags) 535 { 536 struct vmspace *vm; 537 struct thread *td; 538 int error; 539 540 td = curthread; 541 error = proc_vmspace_ref(td, p, flags, &vm); 542 if (error != 0) 543 return (error); 544 error = vmspace_rwmem(vm, uio); 545 proc_vmspace_unref(td, p, flags, vm); 546 return (error); 547 } 548 549 ssize_t 550 vmspace_iop(struct thread *td, struct vmspace *vm, vm_offset_t va, void *buf, 551 size_t len, enum uio_rw rw) 552 { 553 struct iovec iov; 554 struct uio uio; 555 ssize_t slen; 556 int error; 557 558 MPASS(len < SSIZE_MAX); 559 slen = (ssize_t)len; 560 561 iov.iov_base = (caddr_t)buf; 562 iov.iov_len = len; 563 uio.uio_iov = &iov; 564 uio.uio_iovcnt = 1; 565 uio.uio_offset = va; 566 uio.uio_resid = slen; 567 uio.uio_segflg = UIO_SYSSPACE; 568 uio.uio_rw = rw; 569 uio.uio_td = td; 570 error = vmspace_rwmem(vm, &uio); 571 if (error != 0 || uio.uio_resid == slen) 572 return (-1); 573 return (slen - uio.uio_resid); 574 } 575 576 ssize_t 577 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 578 size_t len) 579 { 580 581 return (vmspace_iop(td, p->p_vmspace, va, buf, len, UIO_READ)); 582 } 583 584 ssize_t 585 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 586 size_t len) 587 { 588 589 return (vmspace_iop(td, p->p_vmspace, va, buf, len, UIO_WRITE)); 590 } 591 592 static int 593 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 594 { 595 struct vattr vattr; 596 vm_map_t map; 597 vm_map_entry_t entry; 598 vm_object_t obj, tobj, lobj; 599 struct vmspace *vm; 600 struct vnode *vp; 601 char *freepath, *fullpath; 602 u_int pathlen; 603 int error, index; 604 605 error = 0; 606 obj = NULL; 607 608 vm = vmspace_acquire_ref(p); 609 map = &vm->vm_map; 610 vm_map_lock_read(map); 611 612 do { 613 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0, 614 ("Submap in map header")); 615 index = 0; 616 VM_MAP_ENTRY_FOREACH(entry, map) { 617 if (index >= pve->pve_entry && 618 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0) 619 break; 620 index++; 621 } 622 if (index < pve->pve_entry) { 623 error = EINVAL; 624 break; 625 } 626 if (entry == &map->header) { 627 error = ENOENT; 628 break; 629 } 630 631 /* We got an entry. */ 632 pve->pve_entry = index + 1; 633 pve->pve_timestamp = map->timestamp; 634 pve->pve_start = entry->start; 635 pve->pve_end = entry->end - 1; 636 pve->pve_offset = entry->offset; 637 pve->pve_prot = entry->protection | 638 PROT_MAX(entry->max_protection); 639 640 /* Backing object's path needed? */ 641 if (pve->pve_pathlen == 0) 642 break; 643 644 pathlen = pve->pve_pathlen; 645 pve->pve_pathlen = 0; 646 647 obj = entry->object.vm_object; 648 if (obj != NULL) 649 VM_OBJECT_RLOCK(obj); 650 } while (0); 651 652 vm_map_unlock_read(map); 653 654 pve->pve_fsid = VNOVAL; 655 pve->pve_fileid = VNOVAL; 656 657 if (error == 0 && obj != NULL) { 658 lobj = obj; 659 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 660 if (tobj != obj) 661 VM_OBJECT_RLOCK(tobj); 662 if (lobj != obj) 663 VM_OBJECT_RUNLOCK(lobj); 664 lobj = tobj; 665 pve->pve_offset += tobj->backing_object_offset; 666 } 667 vp = vm_object_vnode(lobj); 668 if (vp != NULL) 669 vref(vp); 670 if (lobj != obj) 671 VM_OBJECT_RUNLOCK(lobj); 672 VM_OBJECT_RUNLOCK(obj); 673 674 if (vp != NULL) { 675 freepath = NULL; 676 fullpath = NULL; 677 vn_fullpath(vp, &fullpath, &freepath); 678 vn_lock(vp, LK_SHARED | LK_RETRY); 679 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 680 pve->pve_fileid = vattr.va_fileid; 681 pve->pve_fsid = vattr.va_fsid; 682 } 683 vput(vp); 684 685 if (fullpath != NULL) { 686 pve->pve_pathlen = strlen(fullpath) + 1; 687 if (pve->pve_pathlen <= pathlen) { 688 error = copyout(fullpath, pve->pve_path, 689 pve->pve_pathlen); 690 } else 691 error = ENAMETOOLONG; 692 } 693 if (freepath != NULL) 694 free(freepath, M_TEMP); 695 } 696 } 697 vmspace_free(vm); 698 if (error == 0) 699 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 700 p->p_pid, pve->pve_entry, pve->pve_start); 701 702 return (error); 703 } 704 705 /* 706 * Process debugging system call. 707 */ 708 #ifndef _SYS_SYSPROTO_H_ 709 struct ptrace_args { 710 int req; 711 pid_t pid; 712 caddr_t addr; 713 int data; 714 }; 715 #endif 716 717 int 718 sys_ptrace(struct thread *td, struct ptrace_args *uap) 719 { 720 /* 721 * XXX this obfuscation is to reduce stack usage, but the register 722 * structs may be too large to put on the stack anyway. 723 */ 724 union { 725 struct ptrace_io_desc piod; 726 struct ptrace_lwpinfo pl; 727 struct ptrace_vm_entry pve; 728 struct ptrace_coredump pc; 729 struct ptrace_sc_remote sr; 730 struct dbreg dbreg; 731 struct fpreg fpreg; 732 struct reg reg; 733 struct iovec vec; 734 syscallarg_t args[nitems(td->td_sa.args)]; 735 struct ptrace_sc_ret psr; 736 int ptevents; 737 } r; 738 syscallarg_t pscr_args[nitems(td->td_sa.args)]; 739 void *addr; 740 int error; 741 742 if (!allow_ptrace) 743 return (ENOSYS); 744 error = 0; 745 746 AUDIT_ARG_PID(uap->pid); 747 AUDIT_ARG_CMD(uap->req); 748 AUDIT_ARG_VALUE(uap->data); 749 addr = &r; 750 switch (uap->req) { 751 case PT_GET_EVENT_MASK: 752 case PT_LWPINFO: 753 case PT_GET_SC_ARGS: 754 case PT_GET_SC_RET: 755 break; 756 case PT_GETREGS: 757 bzero(&r.reg, sizeof(r.reg)); 758 break; 759 case PT_GETFPREGS: 760 bzero(&r.fpreg, sizeof(r.fpreg)); 761 break; 762 case PT_GETDBREGS: 763 bzero(&r.dbreg, sizeof(r.dbreg)); 764 break; 765 case PT_GETREGSET: 766 case PT_SETREGSET: 767 error = copyin(uap->addr, &r.vec, sizeof(r.vec)); 768 break; 769 case PT_SETREGS: 770 error = copyin(uap->addr, &r.reg, sizeof(r.reg)); 771 break; 772 case PT_SETFPREGS: 773 error = copyin(uap->addr, &r.fpreg, sizeof(r.fpreg)); 774 break; 775 case PT_SETDBREGS: 776 error = copyin(uap->addr, &r.dbreg, sizeof(r.dbreg)); 777 break; 778 case PT_SET_EVENT_MASK: 779 if (uap->data != sizeof(r.ptevents)) 780 error = EINVAL; 781 else 782 error = copyin(uap->addr, &r.ptevents, uap->data); 783 break; 784 case PT_IO: 785 error = copyin(uap->addr, &r.piod, sizeof(r.piod)); 786 break; 787 case PT_VM_ENTRY: 788 error = copyin(uap->addr, &r.pve, sizeof(r.pve)); 789 break; 790 case PT_COREDUMP: 791 if (uap->data != sizeof(r.pc)) 792 error = EINVAL; 793 else 794 error = copyin(uap->addr, &r.pc, uap->data); 795 break; 796 case PT_SC_REMOTE: 797 if (uap->data != sizeof(r.sr)) { 798 error = EINVAL; 799 break; 800 } 801 error = copyin(uap->addr, &r.sr, uap->data); 802 if (error != 0) 803 break; 804 if (r.sr.pscr_nargs > nitems(td->td_sa.args)) { 805 error = EINVAL; 806 break; 807 } 808 error = copyin(r.sr.pscr_args, pscr_args, 809 sizeof(u_long) * r.sr.pscr_nargs); 810 if (error != 0) 811 break; 812 r.sr.pscr_args = pscr_args; 813 break; 814 case PTINTERNAL_FIRST ... PTINTERNAL_LAST: 815 error = EINVAL; 816 break; 817 default: 818 addr = uap->addr; 819 break; 820 } 821 if (error != 0) 822 return (error); 823 824 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 825 if (error != 0) 826 return (error); 827 828 switch (uap->req) { 829 case PT_VM_ENTRY: 830 error = copyout(&r.pve, uap->addr, sizeof(r.pve)); 831 break; 832 case PT_IO: 833 error = copyout(&r.piod, uap->addr, sizeof(r.piod)); 834 break; 835 case PT_GETREGS: 836 error = copyout(&r.reg, uap->addr, sizeof(r.reg)); 837 break; 838 case PT_GETFPREGS: 839 error = copyout(&r.fpreg, uap->addr, sizeof(r.fpreg)); 840 break; 841 case PT_GETDBREGS: 842 error = copyout(&r.dbreg, uap->addr, sizeof(r.dbreg)); 843 break; 844 case PT_GETREGSET: 845 error = copyout(&r.vec, uap->addr, sizeof(r.vec)); 846 break; 847 case PT_GET_EVENT_MASK: 848 /* NB: The size in uap->data is validated in kern_ptrace(). */ 849 error = copyout(&r.ptevents, uap->addr, uap->data); 850 break; 851 case PT_LWPINFO: 852 /* NB: The size in uap->data is validated in kern_ptrace(). */ 853 error = copyout(&r.pl, uap->addr, uap->data); 854 break; 855 case PT_GET_SC_ARGS: 856 error = copyout(r.args, uap->addr, MIN(uap->data, 857 sizeof(r.args))); 858 break; 859 case PT_GET_SC_RET: 860 error = copyout(&r.psr, uap->addr, MIN(uap->data, 861 sizeof(r.psr))); 862 break; 863 case PT_SC_REMOTE: 864 error = copyout(&r.sr.pscr_ret, uap->addr + 865 offsetof(struct ptrace_sc_remote, pscr_ret), 866 sizeof(r.sr.pscr_ret)); 867 break; 868 } 869 870 return (error); 871 } 872 873 #ifdef COMPAT_FREEBSD32 874 /* 875 * PROC_READ(regs, td2, addr); 876 * becomes either: 877 * proc_read_regs(td2, addr); 878 * or 879 * proc_read_regs32(td2, addr); 880 * .. except this is done at runtime. There is an additional 881 * complication in that PROC_WRITE disallows 32 bit consumers 882 * from writing to 64 bit address space targets. 883 */ 884 #define PROC_READ(w, t, a) wrap32 ? \ 885 proc_read_ ## w ## 32(t, a) : \ 886 proc_read_ ## w (t, a) 887 #define PROC_WRITE(w, t, a) wrap32 ? \ 888 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 889 proc_write_ ## w (t, a) 890 #else 891 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 892 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 893 #endif 894 895 void 896 proc_set_traced(struct proc *p, bool stop) 897 { 898 899 sx_assert(&proctree_lock, SX_XLOCKED); 900 PROC_LOCK_ASSERT(p, MA_OWNED); 901 p->p_flag |= P_TRACED; 902 if (stop) 903 p->p_flag2 |= P2_PTRACE_FSTP; 904 p->p_ptevents = PTRACE_DEFAULT; 905 } 906 907 void 908 ptrace_unsuspend(struct proc *p) 909 { 910 PROC_LOCK_ASSERT(p, MA_OWNED); 911 912 PROC_SLOCK(p); 913 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED); 914 thread_unsuspend(p); 915 PROC_SUNLOCK(p); 916 itimer_proc_continue(p); 917 kqtimer_proc_continue(p); 918 } 919 920 static int 921 proc_can_ptrace(struct thread *td, struct proc *p) 922 { 923 int error; 924 925 PROC_LOCK_ASSERT(p, MA_OWNED); 926 927 if ((p->p_flag & P_WEXIT) != 0) 928 return (ESRCH); 929 930 if ((error = p_cansee(td, p)) != 0) 931 return (error); 932 if ((error = p_candebug(td, p)) != 0) 933 return (error); 934 935 /* not being traced... */ 936 if ((p->p_flag & P_TRACED) == 0) 937 return (EPERM); 938 939 /* not being traced by YOU */ 940 if (p->p_pptr != td->td_proc) 941 return (EBUSY); 942 943 /* not currently stopped */ 944 if ((p->p_flag & P_STOPPED_TRACE) == 0 || 945 p->p_suspcount != p->p_numthreads || 946 (p->p_flag & P_WAITED) == 0) 947 return (EBUSY); 948 949 return (0); 950 } 951 952 static struct thread * 953 ptrace_sel_coredump_thread(struct proc *p) 954 { 955 struct thread *td2; 956 957 PROC_LOCK_ASSERT(p, MA_OWNED); 958 MPASS((p->p_flag & P_STOPPED_TRACE) != 0); 959 960 FOREACH_THREAD_IN_PROC(p, td2) { 961 if ((td2->td_dbgflags & TDB_SSWITCH) != 0) 962 return (td2); 963 } 964 return (NULL); 965 } 966 967 int 968 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 969 { 970 struct iovec iov; 971 struct uio uio; 972 struct proc *curp, *p, *pp; 973 struct thread *td2 = NULL, *td3; 974 struct ptrace_io_desc *piod = NULL; 975 struct ptrace_lwpinfo *pl; 976 struct ptrace_sc_ret *psr; 977 struct ptrace_sc_remote *pscr; 978 struct file *fp; 979 struct ptrace_coredump *pc; 980 struct thr_coredump_req *tcq; 981 struct thr_syscall_req *tsr; 982 int error, num, tmp; 983 lwpid_t tid = 0, *buf; 984 #ifdef COMPAT_FREEBSD32 985 int wrap32 = 0, safe = 0; 986 #endif 987 bool proctree_locked, p2_req_set; 988 989 curp = td->td_proc; 990 proctree_locked = false; 991 p2_req_set = false; 992 993 /* Lock proctree before locking the process. */ 994 switch (req) { 995 case PT_TRACE_ME: 996 case PT_ATTACH: 997 case PT_STEP: 998 case PT_CONTINUE: 999 case PT_TO_SCE: 1000 case PT_TO_SCX: 1001 case PT_SYSCALL: 1002 case PT_FOLLOW_FORK: 1003 case PT_LWP_EVENTS: 1004 case PT_GET_EVENT_MASK: 1005 case PT_SET_EVENT_MASK: 1006 case PT_DETACH: 1007 case PT_GET_SC_ARGS: 1008 sx_xlock(&proctree_lock); 1009 proctree_locked = true; 1010 break; 1011 default: 1012 break; 1013 } 1014 1015 if (req == PT_TRACE_ME) { 1016 p = td->td_proc; 1017 PROC_LOCK(p); 1018 } else { 1019 if (pid <= PID_MAX) { 1020 if ((p = pfind(pid)) == NULL) { 1021 if (proctree_locked) 1022 sx_xunlock(&proctree_lock); 1023 return (ESRCH); 1024 } 1025 } else { 1026 td2 = tdfind(pid, -1); 1027 if (td2 == NULL) { 1028 if (proctree_locked) 1029 sx_xunlock(&proctree_lock); 1030 return (ESRCH); 1031 } 1032 p = td2->td_proc; 1033 tid = pid; 1034 pid = p->p_pid; 1035 } 1036 } 1037 AUDIT_ARG_PROCESS(p); 1038 1039 if ((p->p_flag & P_WEXIT) != 0) { 1040 error = ESRCH; 1041 goto fail; 1042 } 1043 if ((error = p_cansee(td, p)) != 0) 1044 goto fail; 1045 1046 if ((error = p_candebug(td, p)) != 0) 1047 goto fail; 1048 1049 /* 1050 * System processes can't be debugged. 1051 */ 1052 if ((p->p_flag & P_SYSTEM) != 0) { 1053 error = EINVAL; 1054 goto fail; 1055 } 1056 1057 if (tid == 0) { 1058 if ((p->p_flag & P_STOPPED_TRACE) != 0) 1059 td2 = p->p_xthread; 1060 if (td2 == NULL) 1061 td2 = FIRST_THREAD_IN_PROC(p); 1062 tid = td2->td_tid; 1063 } 1064 1065 #ifdef COMPAT_FREEBSD32 1066 /* 1067 * Test if we're a 32 bit client and what the target is. 1068 * Set the wrap controls accordingly. 1069 */ 1070 if (SV_CURPROC_FLAG(SV_ILP32)) { 1071 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 1072 safe = 1; 1073 wrap32 = 1; 1074 } 1075 #endif 1076 /* 1077 * Permissions check 1078 */ 1079 switch (req) { 1080 case PT_TRACE_ME: 1081 /* 1082 * Always legal, when there is a parent process which 1083 * could trace us. Otherwise, reject. 1084 */ 1085 if ((p->p_flag & P_TRACED) != 0) { 1086 error = EBUSY; 1087 goto fail; 1088 } 1089 if (p->p_pptr == initproc) { 1090 error = EPERM; 1091 goto fail; 1092 } 1093 break; 1094 1095 case PT_ATTACH: 1096 /* Self */ 1097 if (p == td->td_proc) { 1098 error = EINVAL; 1099 goto fail; 1100 } 1101 1102 /* Already traced */ 1103 if (p->p_flag & P_TRACED) { 1104 error = EBUSY; 1105 goto fail; 1106 } 1107 1108 /* Can't trace an ancestor if you're being traced. */ 1109 if (curp->p_flag & P_TRACED) { 1110 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 1111 if (pp == p) { 1112 error = EINVAL; 1113 goto fail; 1114 } 1115 } 1116 } 1117 1118 /* OK */ 1119 break; 1120 1121 case PT_CLEARSTEP: 1122 /* Allow thread to clear single step for itself */ 1123 if (td->td_tid == tid) 1124 break; 1125 1126 /* FALLTHROUGH */ 1127 default: 1128 /* 1129 * Check for ptrace eligibility before waiting for 1130 * holds to drain. 1131 */ 1132 error = proc_can_ptrace(td, p); 1133 if (error != 0) 1134 goto fail; 1135 1136 /* 1137 * Block parallel ptrace requests. Most important, do 1138 * not allow other thread in debugger to continue the 1139 * debuggee until coredump finished. 1140 */ 1141 while ((p->p_flag2 & P2_PTRACEREQ) != 0) { 1142 if (proctree_locked) 1143 sx_xunlock(&proctree_lock); 1144 error = msleep(&p->p_flag2, &p->p_mtx, PPAUSE | PCATCH | 1145 (proctree_locked ? PDROP : 0), "pptrace", 0); 1146 if (proctree_locked) { 1147 sx_xlock(&proctree_lock); 1148 PROC_LOCK(p); 1149 } 1150 if (error == 0 && td2->td_proc != p) 1151 error = ESRCH; 1152 if (error == 0) 1153 error = proc_can_ptrace(td, p); 1154 if (error != 0) 1155 goto fail; 1156 } 1157 1158 /* Ok */ 1159 break; 1160 } 1161 1162 /* 1163 * Keep this process around and request parallel ptrace() 1164 * request to wait until we finish this request. 1165 */ 1166 MPASS((p->p_flag2 & P2_PTRACEREQ) == 0); 1167 p->p_flag2 |= P2_PTRACEREQ; 1168 p2_req_set = true; 1169 _PHOLD(p); 1170 1171 /* 1172 * Actually do the requests 1173 */ 1174 1175 td->td_retval[0] = 0; 1176 1177 switch (req) { 1178 case PT_TRACE_ME: 1179 /* set my trace flag and "owner" so it can read/write me */ 1180 proc_set_traced(p, false); 1181 if (p->p_flag & P_PPWAIT) 1182 p->p_flag |= P_PPTRACE; 1183 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 1184 break; 1185 1186 case PT_ATTACH: 1187 /* security check done above */ 1188 /* 1189 * It would be nice if the tracing relationship was separate 1190 * from the parent relationship but that would require 1191 * another set of links in the proc struct or for "wait" 1192 * to scan the entire proc table. To make life easier, 1193 * we just re-parent the process we're trying to trace. 1194 * The old parent is remembered so we can put things back 1195 * on a "detach". 1196 */ 1197 proc_set_traced(p, true); 1198 proc_reparent(p, td->td_proc, false); 1199 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 1200 p->p_oppid); 1201 1202 sx_xunlock(&proctree_lock); 1203 proctree_locked = false; 1204 MPASS(p->p_xthread == NULL); 1205 MPASS((p->p_flag & P_STOPPED_TRACE) == 0); 1206 1207 /* 1208 * If already stopped due to a stop signal, clear the 1209 * existing stop before triggering a traced SIGSTOP. 1210 */ 1211 if ((p->p_flag & P_STOPPED_SIG) != 0) { 1212 PROC_SLOCK(p); 1213 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED); 1214 thread_unsuspend(p); 1215 PROC_SUNLOCK(p); 1216 } 1217 1218 kern_psignal(p, SIGSTOP); 1219 break; 1220 1221 case PT_CLEARSTEP: 1222 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 1223 p->p_pid); 1224 error = ptrace_clear_single_step(td2); 1225 break; 1226 1227 case PT_SETSTEP: 1228 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 1229 p->p_pid); 1230 error = ptrace_single_step(td2); 1231 break; 1232 1233 case PT_SUSPEND: 1234 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 1235 p->p_pid); 1236 td2->td_dbgflags |= TDB_SUSPEND; 1237 ast_sched(td2, TDA_SUSPEND); 1238 break; 1239 1240 case PT_RESUME: 1241 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 1242 p->p_pid); 1243 td2->td_dbgflags &= ~TDB_SUSPEND; 1244 break; 1245 1246 case PT_FOLLOW_FORK: 1247 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 1248 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 1249 data ? "enabled" : "disabled"); 1250 if (data) 1251 p->p_ptevents |= PTRACE_FORK; 1252 else 1253 p->p_ptevents &= ~PTRACE_FORK; 1254 break; 1255 1256 case PT_LWP_EVENTS: 1257 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 1258 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 1259 data ? "enabled" : "disabled"); 1260 if (data) 1261 p->p_ptevents |= PTRACE_LWP; 1262 else 1263 p->p_ptevents &= ~PTRACE_LWP; 1264 break; 1265 1266 case PT_GET_EVENT_MASK: 1267 if (data != sizeof(p->p_ptevents)) { 1268 error = EINVAL; 1269 break; 1270 } 1271 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 1272 p->p_ptevents); 1273 *(int *)addr = p->p_ptevents; 1274 break; 1275 1276 case PT_SET_EVENT_MASK: 1277 if (data != sizeof(p->p_ptevents)) { 1278 error = EINVAL; 1279 break; 1280 } 1281 tmp = *(int *)addr; 1282 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 1283 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 1284 error = EINVAL; 1285 break; 1286 } 1287 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1288 p->p_pid, p->p_ptevents, tmp); 1289 p->p_ptevents = tmp; 1290 break; 1291 1292 case PT_GET_SC_ARGS: 1293 case PTLINUX_GET_SC_ARGS: 1294 CTR2(KTR_PTRACE, "%s: pid %d", req == PT_GET_SC_ARGS ? 1295 "PT_GET_SC_ARGS" : "PT_LINUX_GET_SC_ARGS", p->p_pid); 1296 if (((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 && 1297 td2->td_sa.code == 0) 1298 #ifdef COMPAT_FREEBSD32 1299 || (wrap32 && !safe) 1300 #endif 1301 ) { 1302 error = EINVAL; 1303 break; 1304 } 1305 if (req == PT_GET_SC_ARGS) { 1306 bzero(addr, sizeof(td2->td_sa.args)); 1307 bcopy(td2->td_sa.args, addr, td2->td_sa.callp->sy_narg * 1308 sizeof(syscallarg_t)); 1309 } else { 1310 /* 1311 * Emulate a Linux bug which which strace(1) depends on: 1312 * at initialization it tests whether ptrace works by 1313 * calling close(2), or some other single-argument 1314 * syscall, _with six arguments_, and then verifies 1315 * whether it can fetch them all using this API; 1316 * otherwise it bails out. 1317 */ 1318 bcopy(td2->td_sa.args, addr, 6 * sizeof(syscallarg_t)); 1319 } 1320 break; 1321 1322 case PT_GET_SC_RET: 1323 if ((td2->td_dbgflags & (TDB_SCX)) == 0 1324 #ifdef COMPAT_FREEBSD32 1325 || (wrap32 && !safe) 1326 #endif 1327 ) { 1328 error = EINVAL; 1329 break; 1330 } 1331 psr = addr; 1332 bzero(psr, sizeof(*psr)); 1333 psr->sr_error = td2->td_errno; 1334 if (psr->sr_error == 0) { 1335 psr->sr_retval[0] = td2->td_retval[0]; 1336 psr->sr_retval[1] = td2->td_retval[1]; 1337 } 1338 CTR4(KTR_PTRACE, 1339 "PT_GET_SC_RET: pid %d error %d retval %#lx,%#lx", 1340 p->p_pid, psr->sr_error, psr->sr_retval[0], 1341 psr->sr_retval[1]); 1342 break; 1343 1344 case PT_STEP: 1345 case PT_CONTINUE: 1346 case PT_TO_SCE: 1347 case PT_TO_SCX: 1348 case PT_SYSCALL: 1349 case PT_DETACH: 1350 /* Zero means do not send any signal */ 1351 if (data < 0 || data > _SIG_MAXSIG) { 1352 error = EINVAL; 1353 break; 1354 } 1355 1356 switch (req) { 1357 case PT_STEP: 1358 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1359 td2->td_tid, p->p_pid, data); 1360 error = ptrace_single_step(td2); 1361 if (error != 0) 1362 goto out; 1363 break; 1364 case PT_CONTINUE: 1365 case PT_TO_SCE: 1366 case PT_TO_SCX: 1367 case PT_SYSCALL: 1368 if (addr != (void *)1) { 1369 error = ptrace_set_pc(td2, 1370 (u_long)(uintfptr_t)addr); 1371 if (error != 0) 1372 goto out; 1373 td2->td_dbgflags |= TDB_USERWR; 1374 } 1375 switch (req) { 1376 case PT_TO_SCE: 1377 p->p_ptevents |= PTRACE_SCE; 1378 CTR4(KTR_PTRACE, 1379 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1380 p->p_pid, p->p_ptevents, 1381 (u_long)(uintfptr_t)addr, data); 1382 break; 1383 case PT_TO_SCX: 1384 p->p_ptevents |= PTRACE_SCX; 1385 CTR4(KTR_PTRACE, 1386 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1387 p->p_pid, p->p_ptevents, 1388 (u_long)(uintfptr_t)addr, data); 1389 break; 1390 case PT_SYSCALL: 1391 p->p_ptevents |= PTRACE_SYSCALL; 1392 CTR4(KTR_PTRACE, 1393 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1394 p->p_pid, p->p_ptevents, 1395 (u_long)(uintfptr_t)addr, data); 1396 break; 1397 case PT_CONTINUE: 1398 CTR3(KTR_PTRACE, 1399 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1400 p->p_pid, (u_long)(uintfptr_t)addr, data); 1401 break; 1402 } 1403 break; 1404 case PT_DETACH: 1405 /* 1406 * Clear P_TRACED before reparenting 1407 * a detached process back to its original 1408 * parent. Otherwise the debugee will be set 1409 * as an orphan of the debugger. 1410 */ 1411 p->p_flag &= ~(P_TRACED | P_WAITED); 1412 1413 /* 1414 * Reset the process parent. 1415 */ 1416 if (p->p_oppid != p->p_pptr->p_pid) { 1417 PROC_LOCK(p->p_pptr); 1418 sigqueue_take(p->p_ksi); 1419 PROC_UNLOCK(p->p_pptr); 1420 1421 pp = proc_realparent(p); 1422 proc_reparent(p, pp, false); 1423 if (pp == initproc) 1424 p->p_sigparent = SIGCHLD; 1425 CTR3(KTR_PTRACE, 1426 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1427 p->p_pid, pp->p_pid, data); 1428 } else { 1429 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1430 p->p_pid, data); 1431 } 1432 1433 p->p_ptevents = 0; 1434 FOREACH_THREAD_IN_PROC(p, td3) { 1435 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1436 sigqueue_delete(&td3->td_sigqueue, 1437 SIGSTOP); 1438 } 1439 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP | 1440 TDB_SUSPEND | TDB_BORN); 1441 } 1442 1443 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1444 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1445 p->p_flag2 &= ~P2_PTRACE_FSTP; 1446 } 1447 1448 /* 1449 * Send SIGCHLD and wakeup the parent as needed. It 1450 * may be the case that they had stopped the child 1451 * before it got ptraced, and now they're in the middle 1452 * of a wait(2) for it to continue. 1453 */ 1454 PROC_LOCK(p->p_pptr); 1455 childproc_continued(p); 1456 PROC_UNLOCK(p->p_pptr); 1457 break; 1458 } 1459 1460 sx_xunlock(&proctree_lock); 1461 proctree_locked = false; 1462 1463 sendsig: 1464 MPASS(!proctree_locked); 1465 1466 /* 1467 * Clear the pending event for the thread that just 1468 * reported its event (p_xthread), if any. This may 1469 * not be the thread passed to PT_CONTINUE, PT_STEP, 1470 * etc. if the debugger is resuming a different 1471 * thread. There might be no reporting thread if 1472 * the process was just attached. 1473 * 1474 * Deliver any pending signal via the reporting thread. 1475 */ 1476 if (p->p_xthread != NULL) { 1477 p->p_xthread->td_dbgflags &= ~TDB_XSIG; 1478 p->p_xthread->td_xsig = data; 1479 p->p_xthread = NULL; 1480 } 1481 p->p_xsig = data; 1482 1483 /* 1484 * P_WKILLED is insurance that a PT_KILL/SIGKILL 1485 * always works immediately, even if another thread is 1486 * unsuspended first and attempts to handle a 1487 * different signal or if the POSIX.1b style signal 1488 * queue cannot accommodate any new signals. 1489 */ 1490 if (data == SIGKILL) 1491 proc_wkilled(p); 1492 1493 /* 1494 * If the PT_CONTINUE-like operation is attempted on 1495 * the thread on sleepq, this is possible only after 1496 * the transparent PT_ATTACH. In this case, if the 1497 * caller modified the thread state, e.g. by writing 1498 * register file or specifying the pc, make the thread 1499 * xstopped by waking it up. 1500 */ 1501 if ((td2->td_dbgflags & TDB_USERWR) != 0 && 1502 pt_attach_transparent) { 1503 thread_lock(td2); 1504 if (TD_ON_SLEEPQ(td2) && 1505 (td2->td_flags & TDF_SINTR) != 0) { 1506 td2->td_dbgflags &= ~TDB_USERWR; 1507 sleepq_abort(td2, EINTR); 1508 } else { 1509 thread_unlock(td2); 1510 } 1511 } 1512 1513 /* 1514 * Unsuspend all threads. To leave a thread 1515 * suspended, use PT_SUSPEND to suspend it before 1516 * continuing the process. 1517 */ 1518 ptrace_unsuspend(p); 1519 break; 1520 1521 case PT_WRITE_I: 1522 case PT_WRITE_D: 1523 td2->td_dbgflags |= TDB_USERWR; 1524 PROC_UNLOCK(p); 1525 error = 0; 1526 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1527 sizeof(int)) != sizeof(int)) 1528 error = ENOMEM; 1529 else 1530 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1531 p->p_pid, addr, data); 1532 PROC_LOCK(p); 1533 break; 1534 1535 case PT_READ_I: 1536 case PT_READ_D: 1537 PROC_UNLOCK(p); 1538 error = tmp = 0; 1539 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1540 sizeof(int)) != sizeof(int)) 1541 error = ENOMEM; 1542 else 1543 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1544 p->p_pid, addr, tmp); 1545 td->td_retval[0] = tmp; 1546 PROC_LOCK(p); 1547 break; 1548 1549 case PT_IO: 1550 piod = addr; 1551 if (piod->piod_len > SSIZE_MAX) { 1552 error = EINVAL; 1553 goto out; 1554 } 1555 iov.iov_base = piod->piod_addr; 1556 iov.iov_len = piod->piod_len; 1557 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1558 uio.uio_resid = piod->piod_len; 1559 uio.uio_iov = &iov; 1560 uio.uio_iovcnt = 1; 1561 uio.uio_segflg = UIO_USERSPACE; 1562 uio.uio_td = td; 1563 switch (piod->piod_op) { 1564 case PIOD_READ_D: 1565 case PIOD_READ_I: 1566 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1567 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1568 uio.uio_rw = UIO_READ; 1569 break; 1570 case PIOD_WRITE_D: 1571 case PIOD_WRITE_I: 1572 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1573 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1574 td2->td_dbgflags |= TDB_USERWR; 1575 uio.uio_rw = UIO_WRITE; 1576 break; 1577 default: 1578 error = EINVAL; 1579 goto out; 1580 } 1581 PROC_UNLOCK(p); 1582 error = proc_rwmem(p, &uio, 0); 1583 piod->piod_len -= uio.uio_resid; 1584 PROC_LOCK(p); 1585 break; 1586 1587 case PT_KILL: 1588 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1589 data = SIGKILL; 1590 goto sendsig; /* in PT_CONTINUE above */ 1591 1592 case PT_SETREGS: 1593 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1594 p->p_pid); 1595 td2->td_dbgflags |= TDB_USERWR; 1596 error = PROC_WRITE(regs, td2, addr); 1597 break; 1598 1599 case PT_GETREGS: 1600 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1601 p->p_pid); 1602 error = PROC_READ(regs, td2, addr); 1603 break; 1604 1605 case PT_SETFPREGS: 1606 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1607 p->p_pid); 1608 td2->td_dbgflags |= TDB_USERWR; 1609 error = PROC_WRITE(fpregs, td2, addr); 1610 break; 1611 1612 case PT_GETFPREGS: 1613 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1614 p->p_pid); 1615 error = PROC_READ(fpregs, td2, addr); 1616 break; 1617 1618 case PT_SETDBREGS: 1619 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1620 p->p_pid); 1621 td2->td_dbgflags |= TDB_USERWR; 1622 error = PROC_WRITE(dbregs, td2, addr); 1623 break; 1624 1625 case PT_GETDBREGS: 1626 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1627 p->p_pid); 1628 error = PROC_READ(dbregs, td2, addr); 1629 break; 1630 1631 case PT_SETREGSET: 1632 CTR2(KTR_PTRACE, "PT_SETREGSET: tid %d (pid %d)", td2->td_tid, 1633 p->p_pid); 1634 error = proc_write_regset(td2, data, addr); 1635 break; 1636 1637 case PT_GETREGSET: 1638 CTR2(KTR_PTRACE, "PT_GETREGSET: tid %d (pid %d)", td2->td_tid, 1639 p->p_pid); 1640 error = proc_read_regset(td2, data, addr); 1641 break; 1642 1643 case PT_LWPINFO: 1644 if (data <= 0 || data > sizeof(*pl)) { 1645 error = EINVAL; 1646 break; 1647 } 1648 pl = addr; 1649 bzero(pl, sizeof(*pl)); 1650 pl->pl_lwpid = td2->td_tid; 1651 pl->pl_event = PL_EVENT_NONE; 1652 pl->pl_flags = 0; 1653 if (td2->td_dbgflags & TDB_XSIG) { 1654 pl->pl_event = PL_EVENT_SIGNAL; 1655 if (td2->td_si.si_signo != 0 && 1656 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1657 + sizeof(pl->pl_siginfo)){ 1658 pl->pl_flags |= PL_FLAG_SI; 1659 pl->pl_siginfo = td2->td_si; 1660 } 1661 } 1662 if (td2->td_dbgflags & TDB_SCE) 1663 pl->pl_flags |= PL_FLAG_SCE; 1664 else if (td2->td_dbgflags & TDB_SCX) 1665 pl->pl_flags |= PL_FLAG_SCX; 1666 if (td2->td_dbgflags & TDB_EXEC) 1667 pl->pl_flags |= PL_FLAG_EXEC; 1668 if (td2->td_dbgflags & TDB_FORK) { 1669 pl->pl_flags |= PL_FLAG_FORKED; 1670 pl->pl_child_pid = td2->td_dbg_forked; 1671 if (td2->td_dbgflags & TDB_VFORK) 1672 pl->pl_flags |= PL_FLAG_VFORKED; 1673 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1674 TDB_VFORK) 1675 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1676 if (td2->td_dbgflags & TDB_CHILD) 1677 pl->pl_flags |= PL_FLAG_CHILD; 1678 if (td2->td_dbgflags & TDB_BORN) 1679 pl->pl_flags |= PL_FLAG_BORN; 1680 if (td2->td_dbgflags & TDB_EXIT) 1681 pl->pl_flags |= PL_FLAG_EXITED; 1682 pl->pl_sigmask = td2->td_sigmask; 1683 pl->pl_siglist = td2->td_siglist; 1684 strcpy(pl->pl_tdname, td2->td_name); 1685 if (td2->td_sa.code != 0) { 1686 pl->pl_syscall_code = td2->td_sa.code; 1687 pl->pl_syscall_narg = td2->td_sa.callp->sy_narg; 1688 } 1689 CTR6(KTR_PTRACE, 1690 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1691 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1692 pl->pl_child_pid, pl->pl_syscall_code); 1693 break; 1694 1695 case PT_GETNUMLWPS: 1696 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1697 p->p_numthreads); 1698 td->td_retval[0] = p->p_numthreads; 1699 break; 1700 1701 case PT_GETLWPLIST: 1702 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1703 p->p_pid, data, p->p_numthreads); 1704 if (data <= 0) { 1705 error = EINVAL; 1706 break; 1707 } 1708 num = imin(p->p_numthreads, data); 1709 PROC_UNLOCK(p); 1710 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1711 tmp = 0; 1712 PROC_LOCK(p); 1713 FOREACH_THREAD_IN_PROC(p, td2) { 1714 if (tmp >= num) 1715 break; 1716 buf[tmp++] = td2->td_tid; 1717 } 1718 PROC_UNLOCK(p); 1719 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1720 free(buf, M_TEMP); 1721 if (!error) 1722 td->td_retval[0] = tmp; 1723 PROC_LOCK(p); 1724 break; 1725 1726 case PT_VM_TIMESTAMP: 1727 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1728 p->p_pid, p->p_vmspace->vm_map.timestamp); 1729 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1730 break; 1731 1732 case PT_VM_ENTRY: 1733 PROC_UNLOCK(p); 1734 error = ptrace_vm_entry(td, p, addr); 1735 PROC_LOCK(p); 1736 break; 1737 1738 case PT_COREDUMP: 1739 pc = addr; 1740 CTR2(KTR_PTRACE, "PT_COREDUMP: pid %d, fd %d", 1741 p->p_pid, pc->pc_fd); 1742 1743 if ((pc->pc_flags & ~(PC_COMPRESS | PC_ALL)) != 0) { 1744 error = EINVAL; 1745 break; 1746 } 1747 PROC_UNLOCK(p); 1748 1749 tcq = malloc(sizeof(*tcq), M_TEMP, M_WAITOK | M_ZERO); 1750 fp = NULL; 1751 error = fget_write(td, pc->pc_fd, &cap_write_rights, &fp); 1752 if (error != 0) 1753 goto coredump_cleanup_nofp; 1754 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VREG) { 1755 error = EPIPE; 1756 goto coredump_cleanup; 1757 } 1758 1759 PROC_LOCK(p); 1760 error = proc_can_ptrace(td, p); 1761 if (error != 0) 1762 goto coredump_cleanup_locked; 1763 1764 td2 = ptrace_sel_coredump_thread(p); 1765 if (td2 == NULL) { 1766 error = EBUSY; 1767 goto coredump_cleanup_locked; 1768 } 1769 KASSERT((td2->td_dbgflags & (TDB_COREDUMPREQ | 1770 TDB_SCREMOTEREQ)) == 0, 1771 ("proc %d tid %d req coredump", p->p_pid, td2->td_tid)); 1772 1773 tcq->tc_vp = fp->f_vnode; 1774 tcq->tc_limit = pc->pc_limit == 0 ? OFF_MAX : pc->pc_limit; 1775 tcq->tc_flags = SVC_PT_COREDUMP; 1776 if ((pc->pc_flags & PC_COMPRESS) == 0) 1777 tcq->tc_flags |= SVC_NOCOMPRESS; 1778 if ((pc->pc_flags & PC_ALL) != 0) 1779 tcq->tc_flags |= SVC_ALL; 1780 td2->td_remotereq = tcq; 1781 td2->td_dbgflags |= TDB_COREDUMPREQ; 1782 thread_run_flash(td2); 1783 while ((td2->td_dbgflags & TDB_COREDUMPREQ) != 0) 1784 msleep(p, &p->p_mtx, PPAUSE, "crdmp", 0); 1785 error = tcq->tc_error; 1786 coredump_cleanup_locked: 1787 PROC_UNLOCK(p); 1788 coredump_cleanup: 1789 fdrop(fp, td); 1790 coredump_cleanup_nofp: 1791 free(tcq, M_TEMP); 1792 PROC_LOCK(p); 1793 break; 1794 1795 case PT_SC_REMOTE: 1796 pscr = addr; 1797 CTR2(KTR_PTRACE, "PT_SC_REMOTE: pid %d, syscall %d", 1798 p->p_pid, pscr->pscr_syscall); 1799 if ((td2->td_dbgflags & TDB_BOUNDARY) == 0) { 1800 error = EBUSY; 1801 break; 1802 } 1803 PROC_UNLOCK(p); 1804 MPASS(pscr->pscr_nargs <= nitems(td->td_sa.args)); 1805 1806 tsr = malloc(sizeof(struct thr_syscall_req), M_TEMP, 1807 M_WAITOK | M_ZERO); 1808 1809 tsr->ts_sa.code = pscr->pscr_syscall; 1810 tsr->ts_nargs = pscr->pscr_nargs; 1811 memcpy(&tsr->ts_sa.args, pscr->pscr_args, 1812 sizeof(syscallarg_t) * tsr->ts_nargs); 1813 1814 PROC_LOCK(p); 1815 error = proc_can_ptrace(td, p); 1816 if (error != 0) { 1817 free(tsr, M_TEMP); 1818 break; 1819 } 1820 if (td2->td_proc != p) { 1821 free(tsr, M_TEMP); 1822 error = ESRCH; 1823 break; 1824 } 1825 KASSERT((td2->td_dbgflags & (TDB_COREDUMPREQ | 1826 TDB_SCREMOTEREQ)) == 0, 1827 ("proc %d tid %d req coredump", p->p_pid, td2->td_tid)); 1828 1829 td2->td_remotereq = tsr; 1830 td2->td_dbgflags |= TDB_SCREMOTEREQ; 1831 thread_run_flash(td2); 1832 while ((td2->td_dbgflags & TDB_SCREMOTEREQ) != 0) 1833 msleep(p, &p->p_mtx, PPAUSE, "pscrx", 0); 1834 error = 0; 1835 memcpy(&pscr->pscr_ret, &tsr->ts_ret, sizeof(tsr->ts_ret)); 1836 free(tsr, M_TEMP); 1837 break; 1838 1839 default: 1840 #ifdef __HAVE_PTRACE_MACHDEP 1841 if (req >= PT_FIRSTMACH) { 1842 PROC_UNLOCK(p); 1843 error = cpu_ptrace(td2, req, addr, data); 1844 PROC_LOCK(p); 1845 } else 1846 #endif 1847 /* Unknown request. */ 1848 error = EINVAL; 1849 break; 1850 } 1851 out: 1852 /* Drop our hold on this process now that the request has completed. */ 1853 _PRELE(p); 1854 fail: 1855 if (p2_req_set) { 1856 if ((p->p_flag2 & P2_PTRACEREQ) != 0) 1857 wakeup(&p->p_flag2); 1858 p->p_flag2 &= ~P2_PTRACEREQ; 1859 } 1860 PROC_UNLOCK(p); 1861 if (proctree_locked) 1862 sx_xunlock(&proctree_lock); 1863 return (error); 1864 } 1865 #undef PROC_READ 1866 #undef PROC_WRITE 1867