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/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include "opt_compat.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/lock.h> 42 #include <sys/mutex.h> 43 #include <sys/syscallsubr.h> 44 #include <sys/sysent.h> 45 #include <sys/sysproto.h> 46 #include <sys/pioctl.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 56 #include <machine/reg.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 #include <compat/freebsd32/freebsd32_signal.h> 72 73 struct ptrace_io_desc32 { 74 int piod_op; 75 uint32_t piod_offs; 76 uint32_t piod_addr; 77 uint32_t piod_len; 78 }; 79 80 struct ptrace_vm_entry32 { 81 int pve_entry; 82 int pve_timestamp; 83 uint32_t pve_start; 84 uint32_t pve_end; 85 uint32_t pve_offset; 86 u_int pve_prot; 87 u_int pve_pathlen; 88 int32_t pve_fileid; 89 u_int pve_fsid; 90 uint32_t pve_path; 91 }; 92 #endif 93 94 /* 95 * Functions implemented using PROC_ACTION(): 96 * 97 * proc_read_regs(proc, regs) 98 * Get the current user-visible register set from the process 99 * and copy it into the regs structure (<machine/reg.h>). 100 * The process is stopped at the time read_regs is called. 101 * 102 * proc_write_regs(proc, regs) 103 * Update the current register set from the passed in regs 104 * structure. Take care to avoid clobbering special CPU 105 * registers or privileged bits in the PSL. 106 * Depending on the architecture this may have fix-up work to do, 107 * especially if the IAR or PCW are modified. 108 * The process is stopped at the time write_regs is called. 109 * 110 * proc_read_fpregs, proc_write_fpregs 111 * deal with the floating point register set, otherwise as above. 112 * 113 * proc_read_dbregs, proc_write_dbregs 114 * deal with the processor debug register set, otherwise as above. 115 * 116 * proc_sstep(proc) 117 * Arrange for the process to trap after executing a single instruction. 118 */ 119 120 #define PROC_ACTION(action) do { \ 121 int error; \ 122 \ 123 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 124 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 125 error = EIO; \ 126 else \ 127 error = (action); \ 128 return (error); \ 129 } while(0) 130 131 int 132 proc_read_regs(struct thread *td, struct reg *regs) 133 { 134 135 PROC_ACTION(fill_regs(td, regs)); 136 } 137 138 int 139 proc_write_regs(struct thread *td, struct reg *regs) 140 { 141 142 PROC_ACTION(set_regs(td, regs)); 143 } 144 145 int 146 proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 147 { 148 149 PROC_ACTION(fill_dbregs(td, dbregs)); 150 } 151 152 int 153 proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 154 { 155 156 PROC_ACTION(set_dbregs(td, dbregs)); 157 } 158 159 /* 160 * Ptrace doesn't support fpregs at all, and there are no security holes 161 * or translations for fpregs, so we can just copy them. 162 */ 163 int 164 proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 165 { 166 167 PROC_ACTION(fill_fpregs(td, fpregs)); 168 } 169 170 int 171 proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 172 { 173 174 PROC_ACTION(set_fpregs(td, fpregs)); 175 } 176 177 #ifdef COMPAT_FREEBSD32 178 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 179 int 180 proc_read_regs32(struct thread *td, struct reg32 *regs32) 181 { 182 183 PROC_ACTION(fill_regs32(td, regs32)); 184 } 185 186 int 187 proc_write_regs32(struct thread *td, struct reg32 *regs32) 188 { 189 190 PROC_ACTION(set_regs32(td, regs32)); 191 } 192 193 int 194 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 195 { 196 197 PROC_ACTION(fill_dbregs32(td, dbregs32)); 198 } 199 200 int 201 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 202 { 203 204 PROC_ACTION(set_dbregs32(td, dbregs32)); 205 } 206 207 int 208 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 209 { 210 211 PROC_ACTION(fill_fpregs32(td, fpregs32)); 212 } 213 214 int 215 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 216 { 217 218 PROC_ACTION(set_fpregs32(td, fpregs32)); 219 } 220 #endif 221 222 int 223 proc_sstep(struct thread *td) 224 { 225 226 PROC_ACTION(ptrace_single_step(td)); 227 } 228 229 int 230 proc_rwmem(struct proc *p, struct uio *uio) 231 { 232 vm_map_t map; 233 vm_offset_t pageno; /* page number */ 234 vm_prot_t reqprot; 235 int error, fault_flags, page_offset, writing; 236 237 /* 238 * Assert that someone has locked this vmspace. (Should be 239 * curthread but we can't assert that.) This keeps the process 240 * from exiting out from under us until this operation completes. 241 */ 242 PROC_ASSERT_HELD(p); 243 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 244 245 /* 246 * The map we want... 247 */ 248 map = &p->p_vmspace->vm_map; 249 250 /* 251 * If we are writing, then we request vm_fault() to create a private 252 * copy of each page. Since these copies will not be writeable by the 253 * process, we must explicity request that they be dirtied. 254 */ 255 writing = uio->uio_rw == UIO_WRITE; 256 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 257 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 258 259 /* 260 * Only map in one page at a time. We don't have to, but it 261 * makes things easier. This way is trivial - right? 262 */ 263 do { 264 vm_offset_t uva; 265 u_int len; 266 vm_page_t m; 267 268 uva = (vm_offset_t)uio->uio_offset; 269 270 /* 271 * Get the page number of this segment. 272 */ 273 pageno = trunc_page(uva); 274 page_offset = uva - pageno; 275 276 /* 277 * How many bytes to copy 278 */ 279 len = min(PAGE_SIZE - page_offset, uio->uio_resid); 280 281 /* 282 * Fault and hold the page on behalf of the process. 283 */ 284 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m); 285 if (error != KERN_SUCCESS) { 286 if (error == KERN_RESOURCE_SHORTAGE) 287 error = ENOMEM; 288 else 289 error = EFAULT; 290 break; 291 } 292 293 /* 294 * Now do the i/o move. 295 */ 296 error = uiomove_fromphys(&m, page_offset, len, uio); 297 298 /* Make the I-cache coherent for breakpoints. */ 299 if (writing && error == 0) { 300 vm_map_lock_read(map); 301 if (vm_map_check_protection(map, pageno, pageno + 302 PAGE_SIZE, VM_PROT_EXECUTE)) 303 vm_sync_icache(map, uva, len); 304 vm_map_unlock_read(map); 305 } 306 307 /* 308 * Release the page. 309 */ 310 vm_page_lock(m); 311 vm_page_unhold(m); 312 vm_page_unlock(m); 313 314 } while (error == 0 && uio->uio_resid > 0); 315 316 return (error); 317 } 318 319 static ssize_t 320 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 321 size_t len, enum uio_rw rw) 322 { 323 struct iovec iov; 324 struct uio uio; 325 ssize_t slen; 326 int error; 327 328 MPASS(len < SSIZE_MAX); 329 slen = (ssize_t)len; 330 331 iov.iov_base = (caddr_t)buf; 332 iov.iov_len = len; 333 uio.uio_iov = &iov; 334 uio.uio_iovcnt = 1; 335 uio.uio_offset = va; 336 uio.uio_resid = slen; 337 uio.uio_segflg = UIO_SYSSPACE; 338 uio.uio_rw = rw; 339 uio.uio_td = td; 340 error = proc_rwmem(p, &uio); 341 if (uio.uio_resid == slen) 342 return (-1); 343 return (slen - uio.uio_resid); 344 } 345 346 ssize_t 347 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 348 size_t len) 349 { 350 351 return (proc_iop(td, p, va, buf, len, UIO_READ)); 352 } 353 354 ssize_t 355 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 356 size_t len) 357 { 358 359 return (proc_iop(td, p, va, buf, len, UIO_WRITE)); 360 } 361 362 static int 363 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 364 { 365 struct vattr vattr; 366 vm_map_t map; 367 vm_map_entry_t entry; 368 vm_object_t obj, tobj, lobj; 369 struct vmspace *vm; 370 struct vnode *vp; 371 char *freepath, *fullpath; 372 u_int pathlen; 373 int error, index; 374 375 error = 0; 376 obj = NULL; 377 378 vm = vmspace_acquire_ref(p); 379 map = &vm->vm_map; 380 vm_map_lock_read(map); 381 382 do { 383 entry = map->header.next; 384 index = 0; 385 while (index < pve->pve_entry && entry != &map->header) { 386 entry = entry->next; 387 index++; 388 } 389 if (index != pve->pve_entry) { 390 error = EINVAL; 391 break; 392 } 393 while (entry != &map->header && 394 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 395 entry = entry->next; 396 index++; 397 } 398 if (entry == &map->header) { 399 error = ENOENT; 400 break; 401 } 402 403 /* We got an entry. */ 404 pve->pve_entry = index + 1; 405 pve->pve_timestamp = map->timestamp; 406 pve->pve_start = entry->start; 407 pve->pve_end = entry->end - 1; 408 pve->pve_offset = entry->offset; 409 pve->pve_prot = entry->protection; 410 411 /* Backing object's path needed? */ 412 if (pve->pve_pathlen == 0) 413 break; 414 415 pathlen = pve->pve_pathlen; 416 pve->pve_pathlen = 0; 417 418 obj = entry->object.vm_object; 419 if (obj != NULL) 420 VM_OBJECT_RLOCK(obj); 421 } while (0); 422 423 vm_map_unlock_read(map); 424 425 pve->pve_fsid = VNOVAL; 426 pve->pve_fileid = VNOVAL; 427 428 if (error == 0 && obj != NULL) { 429 lobj = obj; 430 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 431 if (tobj != obj) 432 VM_OBJECT_RLOCK(tobj); 433 if (lobj != obj) 434 VM_OBJECT_RUNLOCK(lobj); 435 lobj = tobj; 436 pve->pve_offset += tobj->backing_object_offset; 437 } 438 vp = vm_object_vnode(lobj); 439 if (vp != NULL) 440 vref(vp); 441 if (lobj != obj) 442 VM_OBJECT_RUNLOCK(lobj); 443 VM_OBJECT_RUNLOCK(obj); 444 445 if (vp != NULL) { 446 freepath = NULL; 447 fullpath = NULL; 448 vn_fullpath(td, vp, &fullpath, &freepath); 449 vn_lock(vp, LK_SHARED | LK_RETRY); 450 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 451 pve->pve_fileid = vattr.va_fileid; 452 pve->pve_fsid = vattr.va_fsid; 453 } 454 vput(vp); 455 456 if (fullpath != NULL) { 457 pve->pve_pathlen = strlen(fullpath) + 1; 458 if (pve->pve_pathlen <= pathlen) { 459 error = copyout(fullpath, pve->pve_path, 460 pve->pve_pathlen); 461 } else 462 error = ENAMETOOLONG; 463 } 464 if (freepath != NULL) 465 free(freepath, M_TEMP); 466 } 467 } 468 vmspace_free(vm); 469 if (error == 0) 470 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 471 p->p_pid, pve->pve_entry, pve->pve_start); 472 473 return (error); 474 } 475 476 #ifdef COMPAT_FREEBSD32 477 static int 478 ptrace_vm_entry32(struct thread *td, struct proc *p, 479 struct ptrace_vm_entry32 *pve32) 480 { 481 struct ptrace_vm_entry pve; 482 int error; 483 484 pve.pve_entry = pve32->pve_entry; 485 pve.pve_pathlen = pve32->pve_pathlen; 486 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 487 488 error = ptrace_vm_entry(td, p, &pve); 489 if (error == 0) { 490 pve32->pve_entry = pve.pve_entry; 491 pve32->pve_timestamp = pve.pve_timestamp; 492 pve32->pve_start = pve.pve_start; 493 pve32->pve_end = pve.pve_end; 494 pve32->pve_offset = pve.pve_offset; 495 pve32->pve_prot = pve.pve_prot; 496 pve32->pve_fileid = pve.pve_fileid; 497 pve32->pve_fsid = pve.pve_fsid; 498 } 499 500 pve32->pve_pathlen = pve.pve_pathlen; 501 return (error); 502 } 503 504 static void 505 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 506 struct ptrace_lwpinfo32 *pl32) 507 { 508 509 bzero(pl32, sizeof(*pl32)); 510 pl32->pl_lwpid = pl->pl_lwpid; 511 pl32->pl_event = pl->pl_event; 512 pl32->pl_flags = pl->pl_flags; 513 pl32->pl_sigmask = pl->pl_sigmask; 514 pl32->pl_siglist = pl->pl_siglist; 515 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 516 strcpy(pl32->pl_tdname, pl->pl_tdname); 517 pl32->pl_child_pid = pl->pl_child_pid; 518 pl32->pl_syscall_code = pl->pl_syscall_code; 519 pl32->pl_syscall_narg = pl->pl_syscall_narg; 520 } 521 #endif /* COMPAT_FREEBSD32 */ 522 523 /* 524 * Process debugging system call. 525 */ 526 #ifndef _SYS_SYSPROTO_H_ 527 struct ptrace_args { 528 int req; 529 pid_t pid; 530 caddr_t addr; 531 int data; 532 }; 533 #endif 534 535 #ifdef COMPAT_FREEBSD32 536 /* 537 * This CPP subterfuge is to try and reduce the number of ifdefs in 538 * the body of the code. 539 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 540 * becomes either: 541 * copyin(uap->addr, &r.reg, sizeof r.reg); 542 * or 543 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 544 * .. except this is done at runtime. 545 */ 546 #define COPYIN(u, k, s) wrap32 ? \ 547 copyin(u, k ## 32, s ## 32) : \ 548 copyin(u, k, s) 549 #define COPYOUT(k, u, s) wrap32 ? \ 550 copyout(k ## 32, u, s ## 32) : \ 551 copyout(k, u, s) 552 #else 553 #define COPYIN(u, k, s) copyin(u, k, s) 554 #define COPYOUT(k, u, s) copyout(k, u, s) 555 #endif 556 int 557 sys_ptrace(struct thread *td, struct ptrace_args *uap) 558 { 559 /* 560 * XXX this obfuscation is to reduce stack usage, but the register 561 * structs may be too large to put on the stack anyway. 562 */ 563 union { 564 struct ptrace_io_desc piod; 565 struct ptrace_lwpinfo pl; 566 struct ptrace_vm_entry pve; 567 struct dbreg dbreg; 568 struct fpreg fpreg; 569 struct reg reg; 570 #ifdef COMPAT_FREEBSD32 571 struct dbreg32 dbreg32; 572 struct fpreg32 fpreg32; 573 struct reg32 reg32; 574 struct ptrace_io_desc32 piod32; 575 struct ptrace_lwpinfo32 pl32; 576 struct ptrace_vm_entry32 pve32; 577 #endif 578 char args[nitems(td->td_sa.args) * sizeof(register_t)]; 579 int ptevents; 580 } r; 581 void *addr; 582 int error = 0; 583 #ifdef COMPAT_FREEBSD32 584 int wrap32 = 0; 585 586 if (SV_CURPROC_FLAG(SV_ILP32)) 587 wrap32 = 1; 588 #endif 589 AUDIT_ARG_PID(uap->pid); 590 AUDIT_ARG_CMD(uap->req); 591 AUDIT_ARG_VALUE(uap->data); 592 addr = &r; 593 switch (uap->req) { 594 case PT_GET_EVENT_MASK: 595 case PT_GETREGS: 596 case PT_GETFPREGS: 597 case PT_GETDBREGS: 598 case PT_LWPINFO: 599 case PT_GET_SC_ARGS: 600 break; 601 case PT_SETREGS: 602 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 603 break; 604 case PT_SETFPREGS: 605 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 606 break; 607 case PT_SETDBREGS: 608 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 609 break; 610 case PT_SET_EVENT_MASK: 611 if (uap->data != sizeof(r.ptevents)) 612 error = EINVAL; 613 else 614 error = copyin(uap->addr, &r.ptevents, uap->data); 615 break; 616 case PT_IO: 617 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 618 break; 619 case PT_VM_ENTRY: 620 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 621 break; 622 default: 623 addr = uap->addr; 624 break; 625 } 626 if (error) 627 return (error); 628 629 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 630 if (error) 631 return (error); 632 633 switch (uap->req) { 634 case PT_VM_ENTRY: 635 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 636 break; 637 case PT_IO: 638 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 639 break; 640 case PT_GETREGS: 641 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 642 break; 643 case PT_GETFPREGS: 644 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 645 break; 646 case PT_GETDBREGS: 647 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 648 break; 649 case PT_GET_EVENT_MASK: 650 /* NB: The size in uap->data is validated in kern_ptrace(). */ 651 error = copyout(&r.ptevents, uap->addr, uap->data); 652 break; 653 case PT_LWPINFO: 654 /* NB: The size in uap->data is validated in kern_ptrace(). */ 655 error = copyout(&r.pl, uap->addr, uap->data); 656 break; 657 case PT_GET_SC_ARGS: 658 error = copyout(r.args, uap->addr, MIN(uap->data, 659 sizeof(r.args))); 660 break; 661 } 662 663 return (error); 664 } 665 #undef COPYIN 666 #undef COPYOUT 667 668 #ifdef COMPAT_FREEBSD32 669 /* 670 * PROC_READ(regs, td2, addr); 671 * becomes either: 672 * proc_read_regs(td2, addr); 673 * or 674 * proc_read_regs32(td2, addr); 675 * .. except this is done at runtime. There is an additional 676 * complication in that PROC_WRITE disallows 32 bit consumers 677 * from writing to 64 bit address space targets. 678 */ 679 #define PROC_READ(w, t, a) wrap32 ? \ 680 proc_read_ ## w ## 32(t, a) : \ 681 proc_read_ ## w (t, a) 682 #define PROC_WRITE(w, t, a) wrap32 ? \ 683 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 684 proc_write_ ## w (t, a) 685 #else 686 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 687 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 688 #endif 689 690 void 691 proc_set_traced(struct proc *p, bool stop) 692 { 693 694 PROC_LOCK_ASSERT(p, MA_OWNED); 695 p->p_flag |= P_TRACED; 696 if (stop) 697 p->p_flag2 |= P2_PTRACE_FSTP; 698 p->p_ptevents = PTRACE_DEFAULT; 699 p->p_oppid = p->p_pptr->p_pid; 700 } 701 702 int 703 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 704 { 705 struct iovec iov; 706 struct uio uio; 707 struct proc *curp, *p, *pp; 708 struct thread *td2 = NULL, *td3; 709 struct ptrace_io_desc *piod = NULL; 710 struct ptrace_lwpinfo *pl; 711 int error, num, tmp; 712 int proctree_locked = 0; 713 lwpid_t tid = 0, *buf; 714 #ifdef COMPAT_FREEBSD32 715 int wrap32 = 0, safe = 0; 716 struct ptrace_io_desc32 *piod32 = NULL; 717 struct ptrace_lwpinfo32 *pl32 = NULL; 718 struct ptrace_lwpinfo plr; 719 #endif 720 721 curp = td->td_proc; 722 723 /* Lock proctree before locking the process. */ 724 switch (req) { 725 case PT_TRACE_ME: 726 case PT_ATTACH: 727 case PT_STEP: 728 case PT_CONTINUE: 729 case PT_TO_SCE: 730 case PT_TO_SCX: 731 case PT_SYSCALL: 732 case PT_FOLLOW_FORK: 733 case PT_LWP_EVENTS: 734 case PT_GET_EVENT_MASK: 735 case PT_SET_EVENT_MASK: 736 case PT_DETACH: 737 case PT_GET_SC_ARGS: 738 sx_xlock(&proctree_lock); 739 proctree_locked = 1; 740 break; 741 default: 742 break; 743 } 744 745 if (req == PT_TRACE_ME) { 746 p = td->td_proc; 747 PROC_LOCK(p); 748 } else { 749 if (pid <= PID_MAX) { 750 if ((p = pfind(pid)) == NULL) { 751 if (proctree_locked) 752 sx_xunlock(&proctree_lock); 753 return (ESRCH); 754 } 755 } else { 756 td2 = tdfind(pid, -1); 757 if (td2 == NULL) { 758 if (proctree_locked) 759 sx_xunlock(&proctree_lock); 760 return (ESRCH); 761 } 762 p = td2->td_proc; 763 tid = pid; 764 pid = p->p_pid; 765 } 766 } 767 AUDIT_ARG_PROCESS(p); 768 769 if ((p->p_flag & P_WEXIT) != 0) { 770 error = ESRCH; 771 goto fail; 772 } 773 if ((error = p_cansee(td, p)) != 0) 774 goto fail; 775 776 if ((error = p_candebug(td, p)) != 0) 777 goto fail; 778 779 /* 780 * System processes can't be debugged. 781 */ 782 if ((p->p_flag & P_SYSTEM) != 0) { 783 error = EINVAL; 784 goto fail; 785 } 786 787 if (tid == 0) { 788 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 789 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 790 td2 = p->p_xthread; 791 } else { 792 td2 = FIRST_THREAD_IN_PROC(p); 793 } 794 tid = td2->td_tid; 795 } 796 797 #ifdef COMPAT_FREEBSD32 798 /* 799 * Test if we're a 32 bit client and what the target is. 800 * Set the wrap controls accordingly. 801 */ 802 if (SV_CURPROC_FLAG(SV_ILP32)) { 803 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 804 safe = 1; 805 wrap32 = 1; 806 } 807 #endif 808 /* 809 * Permissions check 810 */ 811 switch (req) { 812 case PT_TRACE_ME: 813 /* 814 * Always legal, when there is a parent process which 815 * could trace us. Otherwise, reject. 816 */ 817 if ((p->p_flag & P_TRACED) != 0) { 818 error = EBUSY; 819 goto fail; 820 } 821 if (p->p_pptr == initproc) { 822 error = EPERM; 823 goto fail; 824 } 825 break; 826 827 case PT_ATTACH: 828 /* Self */ 829 if (p == td->td_proc) { 830 error = EINVAL; 831 goto fail; 832 } 833 834 /* Already traced */ 835 if (p->p_flag & P_TRACED) { 836 error = EBUSY; 837 goto fail; 838 } 839 840 /* Can't trace an ancestor if you're being traced. */ 841 if (curp->p_flag & P_TRACED) { 842 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 843 if (pp == p) { 844 error = EINVAL; 845 goto fail; 846 } 847 } 848 } 849 850 851 /* OK */ 852 break; 853 854 case PT_CLEARSTEP: 855 /* Allow thread to clear single step for itself */ 856 if (td->td_tid == tid) 857 break; 858 859 /* FALLTHROUGH */ 860 default: 861 /* not being traced... */ 862 if ((p->p_flag & P_TRACED) == 0) { 863 error = EPERM; 864 goto fail; 865 } 866 867 /* not being traced by YOU */ 868 if (p->p_pptr != td->td_proc) { 869 error = EBUSY; 870 goto fail; 871 } 872 873 /* not currently stopped */ 874 if ((p->p_flag & P_STOPPED_TRACE) == 0 || 875 p->p_suspcount != p->p_numthreads || 876 (p->p_flag & P_WAITED) == 0) { 877 error = EBUSY; 878 goto fail; 879 } 880 881 /* OK */ 882 break; 883 } 884 885 /* Keep this process around until we finish this request. */ 886 _PHOLD(p); 887 888 #ifdef FIX_SSTEP 889 /* 890 * Single step fixup ala procfs 891 */ 892 FIX_SSTEP(td2); 893 #endif 894 895 /* 896 * Actually do the requests 897 */ 898 899 td->td_retval[0] = 0; 900 901 switch (req) { 902 case PT_TRACE_ME: 903 /* set my trace flag and "owner" so it can read/write me */ 904 proc_set_traced(p, false); 905 if (p->p_flag & P_PPWAIT) 906 p->p_flag |= P_PPTRACE; 907 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 908 break; 909 910 case PT_ATTACH: 911 /* security check done above */ 912 /* 913 * It would be nice if the tracing relationship was separate 914 * from the parent relationship but that would require 915 * another set of links in the proc struct or for "wait" 916 * to scan the entire proc table. To make life easier, 917 * we just re-parent the process we're trying to trace. 918 * The old parent is remembered so we can put things back 919 * on a "detach". 920 */ 921 proc_set_traced(p, true); 922 if (p->p_pptr != td->td_proc) { 923 proc_reparent(p, td->td_proc); 924 } 925 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 926 p->p_oppid); 927 928 sx_xunlock(&proctree_lock); 929 proctree_locked = 0; 930 MPASS(p->p_xthread == NULL); 931 MPASS((p->p_flag & P_STOPPED_TRACE) == 0); 932 933 /* 934 * If already stopped due to a stop signal, clear the 935 * existing stop before triggering a traced SIGSTOP. 936 */ 937 if ((p->p_flag & P_STOPPED_SIG) != 0) { 938 PROC_SLOCK(p); 939 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED); 940 thread_unsuspend(p); 941 PROC_SUNLOCK(p); 942 } 943 944 kern_psignal(p, SIGSTOP); 945 break; 946 947 case PT_CLEARSTEP: 948 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 949 p->p_pid); 950 error = ptrace_clear_single_step(td2); 951 break; 952 953 case PT_SETSTEP: 954 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 955 p->p_pid); 956 error = ptrace_single_step(td2); 957 break; 958 959 case PT_SUSPEND: 960 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 961 p->p_pid); 962 td2->td_dbgflags |= TDB_SUSPEND; 963 thread_lock(td2); 964 td2->td_flags |= TDF_NEEDSUSPCHK; 965 thread_unlock(td2); 966 break; 967 968 case PT_RESUME: 969 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 970 p->p_pid); 971 td2->td_dbgflags &= ~TDB_SUSPEND; 972 break; 973 974 case PT_FOLLOW_FORK: 975 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 976 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 977 data ? "enabled" : "disabled"); 978 if (data) 979 p->p_ptevents |= PTRACE_FORK; 980 else 981 p->p_ptevents &= ~PTRACE_FORK; 982 break; 983 984 case PT_LWP_EVENTS: 985 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 986 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 987 data ? "enabled" : "disabled"); 988 if (data) 989 p->p_ptevents |= PTRACE_LWP; 990 else 991 p->p_ptevents &= ~PTRACE_LWP; 992 break; 993 994 case PT_GET_EVENT_MASK: 995 if (data != sizeof(p->p_ptevents)) { 996 error = EINVAL; 997 break; 998 } 999 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 1000 p->p_ptevents); 1001 *(int *)addr = p->p_ptevents; 1002 break; 1003 1004 case PT_SET_EVENT_MASK: 1005 if (data != sizeof(p->p_ptevents)) { 1006 error = EINVAL; 1007 break; 1008 } 1009 tmp = *(int *)addr; 1010 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 1011 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 1012 error = EINVAL; 1013 break; 1014 } 1015 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1016 p->p_pid, p->p_ptevents, tmp); 1017 p->p_ptevents = tmp; 1018 break; 1019 1020 case PT_GET_SC_ARGS: 1021 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1022 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1023 #ifdef COMPAT_FREEBSD32 1024 || (wrap32 && !safe) 1025 #endif 1026 ) { 1027 error = EINVAL; 1028 break; 1029 } 1030 bzero(addr, sizeof(td2->td_sa.args)); 1031 #ifdef COMPAT_FREEBSD32 1032 if (wrap32) 1033 for (num = 0; num < nitems(td2->td_sa.args); num++) 1034 ((uint32_t *)addr)[num] = (uint32_t) 1035 td2->td_sa.args[num]; 1036 else 1037 #endif 1038 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1039 sizeof(register_t)); 1040 break; 1041 1042 case PT_STEP: 1043 case PT_CONTINUE: 1044 case PT_TO_SCE: 1045 case PT_TO_SCX: 1046 case PT_SYSCALL: 1047 case PT_DETACH: 1048 /* Zero means do not send any signal */ 1049 if (data < 0 || data > _SIG_MAXSIG) { 1050 error = EINVAL; 1051 break; 1052 } 1053 1054 switch (req) { 1055 case PT_STEP: 1056 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1057 td2->td_tid, p->p_pid, data); 1058 error = ptrace_single_step(td2); 1059 if (error) 1060 goto out; 1061 break; 1062 case PT_CONTINUE: 1063 case PT_TO_SCE: 1064 case PT_TO_SCX: 1065 case PT_SYSCALL: 1066 if (addr != (void *)1) { 1067 error = ptrace_set_pc(td2, 1068 (u_long)(uintfptr_t)addr); 1069 if (error) 1070 goto out; 1071 } 1072 switch (req) { 1073 case PT_TO_SCE: 1074 p->p_ptevents |= PTRACE_SCE; 1075 CTR4(KTR_PTRACE, 1076 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1077 p->p_pid, p->p_ptevents, 1078 (u_long)(uintfptr_t)addr, data); 1079 break; 1080 case PT_TO_SCX: 1081 p->p_ptevents |= PTRACE_SCX; 1082 CTR4(KTR_PTRACE, 1083 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1084 p->p_pid, p->p_ptevents, 1085 (u_long)(uintfptr_t)addr, data); 1086 break; 1087 case PT_SYSCALL: 1088 p->p_ptevents |= PTRACE_SYSCALL; 1089 CTR4(KTR_PTRACE, 1090 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1091 p->p_pid, p->p_ptevents, 1092 (u_long)(uintfptr_t)addr, data); 1093 break; 1094 case PT_CONTINUE: 1095 CTR3(KTR_PTRACE, 1096 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1097 p->p_pid, (u_long)(uintfptr_t)addr, data); 1098 break; 1099 } 1100 break; 1101 case PT_DETACH: 1102 /* 1103 * Reset the process parent. 1104 * 1105 * NB: This clears P_TRACED before reparenting 1106 * a detached process back to its original 1107 * parent. Otherwise the debugee will be set 1108 * as an orphan of the debugger. 1109 */ 1110 p->p_flag &= ~(P_TRACED | P_WAITED); 1111 if (p->p_oppid != p->p_pptr->p_pid) { 1112 PROC_LOCK(p->p_pptr); 1113 sigqueue_take(p->p_ksi); 1114 PROC_UNLOCK(p->p_pptr); 1115 1116 pp = proc_realparent(p); 1117 proc_reparent(p, pp); 1118 if (pp == initproc) 1119 p->p_sigparent = SIGCHLD; 1120 CTR3(KTR_PTRACE, 1121 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1122 p->p_pid, pp->p_pid, data); 1123 } else 1124 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1125 p->p_pid, data); 1126 p->p_oppid = 0; 1127 p->p_ptevents = 0; 1128 FOREACH_THREAD_IN_PROC(p, td3) { 1129 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1130 sigqueue_delete(&td3->td_sigqueue, 1131 SIGSTOP); 1132 } 1133 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP | 1134 TDB_SUSPEND); 1135 } 1136 1137 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1138 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1139 p->p_flag2 &= ~P2_PTRACE_FSTP; 1140 } 1141 1142 /* should we send SIGCHLD? */ 1143 /* childproc_continued(p); */ 1144 break; 1145 } 1146 1147 sx_xunlock(&proctree_lock); 1148 proctree_locked = 0; 1149 1150 sendsig: 1151 MPASS(proctree_locked == 0); 1152 1153 /* 1154 * Clear the pending event for the thread that just 1155 * reported its event (p_xthread). This may not be 1156 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1157 * the debugger is resuming a different thread. 1158 * 1159 * Deliver any pending signal via the reporting thread. 1160 */ 1161 MPASS(p->p_xthread != NULL); 1162 p->p_xthread->td_dbgflags &= ~TDB_XSIG; 1163 p->p_xthread->td_xsig = data; 1164 p->p_xthread = NULL; 1165 p->p_xsig = data; 1166 1167 /* 1168 * P_WKILLED is insurance that a PT_KILL/SIGKILL 1169 * always works immediately, even if another thread is 1170 * unsuspended first and attempts to handle a 1171 * different signal or if the POSIX.1b style signal 1172 * queue cannot accommodate any new signals. 1173 */ 1174 if (data == SIGKILL) 1175 p->p_flag |= P_WKILLED; 1176 1177 /* 1178 * Unsuspend all threads. To leave a thread 1179 * suspended, use PT_SUSPEND to suspend it before 1180 * continuing the process. 1181 */ 1182 PROC_SLOCK(p); 1183 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED); 1184 thread_unsuspend(p); 1185 PROC_SUNLOCK(p); 1186 break; 1187 1188 case PT_WRITE_I: 1189 case PT_WRITE_D: 1190 td2->td_dbgflags |= TDB_USERWR; 1191 PROC_UNLOCK(p); 1192 error = 0; 1193 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1194 sizeof(int)) != sizeof(int)) 1195 error = ENOMEM; 1196 else 1197 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1198 p->p_pid, addr, data); 1199 PROC_LOCK(p); 1200 break; 1201 1202 case PT_READ_I: 1203 case PT_READ_D: 1204 PROC_UNLOCK(p); 1205 error = tmp = 0; 1206 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1207 sizeof(int)) != sizeof(int)) 1208 error = ENOMEM; 1209 else 1210 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1211 p->p_pid, addr, tmp); 1212 td->td_retval[0] = tmp; 1213 PROC_LOCK(p); 1214 break; 1215 1216 case PT_IO: 1217 #ifdef COMPAT_FREEBSD32 1218 if (wrap32) { 1219 piod32 = addr; 1220 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1221 iov.iov_len = piod32->piod_len; 1222 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1223 uio.uio_resid = piod32->piod_len; 1224 } else 1225 #endif 1226 { 1227 piod = addr; 1228 iov.iov_base = piod->piod_addr; 1229 iov.iov_len = piod->piod_len; 1230 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1231 uio.uio_resid = piod->piod_len; 1232 } 1233 uio.uio_iov = &iov; 1234 uio.uio_iovcnt = 1; 1235 uio.uio_segflg = UIO_USERSPACE; 1236 uio.uio_td = td; 1237 #ifdef COMPAT_FREEBSD32 1238 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1239 #else 1240 tmp = piod->piod_op; 1241 #endif 1242 switch (tmp) { 1243 case PIOD_READ_D: 1244 case PIOD_READ_I: 1245 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1246 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1247 uio.uio_rw = UIO_READ; 1248 break; 1249 case PIOD_WRITE_D: 1250 case PIOD_WRITE_I: 1251 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1252 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1253 td2->td_dbgflags |= TDB_USERWR; 1254 uio.uio_rw = UIO_WRITE; 1255 break; 1256 default: 1257 error = EINVAL; 1258 goto out; 1259 } 1260 PROC_UNLOCK(p); 1261 error = proc_rwmem(p, &uio); 1262 #ifdef COMPAT_FREEBSD32 1263 if (wrap32) 1264 piod32->piod_len -= uio.uio_resid; 1265 else 1266 #endif 1267 piod->piod_len -= uio.uio_resid; 1268 PROC_LOCK(p); 1269 break; 1270 1271 case PT_KILL: 1272 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1273 data = SIGKILL; 1274 goto sendsig; /* in PT_CONTINUE above */ 1275 1276 case PT_SETREGS: 1277 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1278 p->p_pid); 1279 td2->td_dbgflags |= TDB_USERWR; 1280 error = PROC_WRITE(regs, td2, addr); 1281 break; 1282 1283 case PT_GETREGS: 1284 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1285 p->p_pid); 1286 error = PROC_READ(regs, td2, addr); 1287 break; 1288 1289 case PT_SETFPREGS: 1290 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1291 p->p_pid); 1292 td2->td_dbgflags |= TDB_USERWR; 1293 error = PROC_WRITE(fpregs, td2, addr); 1294 break; 1295 1296 case PT_GETFPREGS: 1297 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1298 p->p_pid); 1299 error = PROC_READ(fpregs, td2, addr); 1300 break; 1301 1302 case PT_SETDBREGS: 1303 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1304 p->p_pid); 1305 td2->td_dbgflags |= TDB_USERWR; 1306 error = PROC_WRITE(dbregs, td2, addr); 1307 break; 1308 1309 case PT_GETDBREGS: 1310 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1311 p->p_pid); 1312 error = PROC_READ(dbregs, td2, addr); 1313 break; 1314 1315 case PT_LWPINFO: 1316 if (data <= 0 || 1317 #ifdef COMPAT_FREEBSD32 1318 (!wrap32 && data > sizeof(*pl)) || 1319 (wrap32 && data > sizeof(*pl32))) { 1320 #else 1321 data > sizeof(*pl)) { 1322 #endif 1323 error = EINVAL; 1324 break; 1325 } 1326 #ifdef COMPAT_FREEBSD32 1327 if (wrap32) { 1328 pl = &plr; 1329 pl32 = addr; 1330 } else 1331 #endif 1332 pl = addr; 1333 bzero(pl, sizeof(*pl)); 1334 pl->pl_lwpid = td2->td_tid; 1335 pl->pl_event = PL_EVENT_NONE; 1336 pl->pl_flags = 0; 1337 if (td2->td_dbgflags & TDB_XSIG) { 1338 pl->pl_event = PL_EVENT_SIGNAL; 1339 if (td2->td_si.si_signo != 0 && 1340 #ifdef COMPAT_FREEBSD32 1341 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1342 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1343 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1344 pl_siginfo) + sizeof(struct siginfo32))) 1345 #else 1346 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1347 + sizeof(pl->pl_siginfo) 1348 #endif 1349 ){ 1350 pl->pl_flags |= PL_FLAG_SI; 1351 pl->pl_siginfo = td2->td_si; 1352 } 1353 } 1354 if (td2->td_dbgflags & TDB_SCE) 1355 pl->pl_flags |= PL_FLAG_SCE; 1356 else if (td2->td_dbgflags & TDB_SCX) 1357 pl->pl_flags |= PL_FLAG_SCX; 1358 if (td2->td_dbgflags & TDB_EXEC) 1359 pl->pl_flags |= PL_FLAG_EXEC; 1360 if (td2->td_dbgflags & TDB_FORK) { 1361 pl->pl_flags |= PL_FLAG_FORKED; 1362 pl->pl_child_pid = td2->td_dbg_forked; 1363 if (td2->td_dbgflags & TDB_VFORK) 1364 pl->pl_flags |= PL_FLAG_VFORKED; 1365 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1366 TDB_VFORK) 1367 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1368 if (td2->td_dbgflags & TDB_CHILD) 1369 pl->pl_flags |= PL_FLAG_CHILD; 1370 if (td2->td_dbgflags & TDB_BORN) 1371 pl->pl_flags |= PL_FLAG_BORN; 1372 if (td2->td_dbgflags & TDB_EXIT) 1373 pl->pl_flags |= PL_FLAG_EXITED; 1374 pl->pl_sigmask = td2->td_sigmask; 1375 pl->pl_siglist = td2->td_siglist; 1376 strcpy(pl->pl_tdname, td2->td_name); 1377 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1378 pl->pl_syscall_code = td2->td_sa.code; 1379 pl->pl_syscall_narg = td2->td_sa.narg; 1380 } else { 1381 pl->pl_syscall_code = 0; 1382 pl->pl_syscall_narg = 0; 1383 } 1384 #ifdef COMPAT_FREEBSD32 1385 if (wrap32) 1386 ptrace_lwpinfo_to32(pl, pl32); 1387 #endif 1388 CTR6(KTR_PTRACE, 1389 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1390 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1391 pl->pl_child_pid, pl->pl_syscall_code); 1392 break; 1393 1394 case PT_GETNUMLWPS: 1395 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1396 p->p_numthreads); 1397 td->td_retval[0] = p->p_numthreads; 1398 break; 1399 1400 case PT_GETLWPLIST: 1401 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1402 p->p_pid, data, p->p_numthreads); 1403 if (data <= 0) { 1404 error = EINVAL; 1405 break; 1406 } 1407 num = imin(p->p_numthreads, data); 1408 PROC_UNLOCK(p); 1409 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1410 tmp = 0; 1411 PROC_LOCK(p); 1412 FOREACH_THREAD_IN_PROC(p, td2) { 1413 if (tmp >= num) 1414 break; 1415 buf[tmp++] = td2->td_tid; 1416 } 1417 PROC_UNLOCK(p); 1418 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1419 free(buf, M_TEMP); 1420 if (!error) 1421 td->td_retval[0] = tmp; 1422 PROC_LOCK(p); 1423 break; 1424 1425 case PT_VM_TIMESTAMP: 1426 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1427 p->p_pid, p->p_vmspace->vm_map.timestamp); 1428 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1429 break; 1430 1431 case PT_VM_ENTRY: 1432 PROC_UNLOCK(p); 1433 #ifdef COMPAT_FREEBSD32 1434 if (wrap32) 1435 error = ptrace_vm_entry32(td, p, addr); 1436 else 1437 #endif 1438 error = ptrace_vm_entry(td, p, addr); 1439 PROC_LOCK(p); 1440 break; 1441 1442 default: 1443 #ifdef __HAVE_PTRACE_MACHDEP 1444 if (req >= PT_FIRSTMACH) { 1445 PROC_UNLOCK(p); 1446 error = cpu_ptrace(td2, req, addr, data); 1447 PROC_LOCK(p); 1448 } else 1449 #endif 1450 /* Unknown request. */ 1451 error = EINVAL; 1452 break; 1453 } 1454 1455 out: 1456 /* Drop our hold on this process now that the request has completed. */ 1457 _PRELE(p); 1458 fail: 1459 PROC_UNLOCK(p); 1460 if (proctree_locked) 1461 sx_xunlock(&proctree_lock); 1462 return (error); 1463 } 1464 #undef PROC_READ 1465 #undef PROC_WRITE 1466 1467 /* 1468 * Stop a process because of a debugging event; 1469 * stay stopped until p->p_step is cleared 1470 * (cleared by PIOCCONT in procfs). 1471 */ 1472 void 1473 stopevent(struct proc *p, unsigned int event, unsigned int val) 1474 { 1475 1476 PROC_LOCK_ASSERT(p, MA_OWNED); 1477 p->p_step = 1; 1478 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1479 val); 1480 do { 1481 if (event != S_EXIT) 1482 p->p_xsig = val; 1483 p->p_xthread = NULL; 1484 p->p_stype = event; /* Which event caused the stop? */ 1485 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1486 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1487 } while (p->p_step); 1488 } 1489