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 <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/pioctl.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/vnode.h> 48 #include <sys/ptrace.h> 49 #include <sys/rwlock.h> 50 #include <sys/sx.h> 51 #include <sys/malloc.h> 52 #include <sys/signalvar.h> 53 54 #include <machine/reg.h> 55 56 #include <security/audit/audit.h> 57 58 #include <vm/vm.h> 59 #include <vm/pmap.h> 60 #include <vm/vm_extern.h> 61 #include <vm/vm_map.h> 62 #include <vm/vm_kern.h> 63 #include <vm/vm_object.h> 64 #include <vm/vm_page.h> 65 #include <vm/vm_param.h> 66 67 #ifdef COMPAT_FREEBSD32 68 #include <sys/procfs.h> 69 #include <compat/freebsd32/freebsd32_signal.h> 70 71 struct ptrace_io_desc32 { 72 int piod_op; 73 uint32_t piod_offs; 74 uint32_t piod_addr; 75 uint32_t piod_len; 76 }; 77 78 struct ptrace_vm_entry32 { 79 int pve_entry; 80 int pve_timestamp; 81 uint32_t pve_start; 82 uint32_t pve_end; 83 uint32_t pve_offset; 84 u_int pve_prot; 85 u_int pve_pathlen; 86 int32_t pve_fileid; 87 u_int pve_fsid; 88 uint32_t pve_path; 89 }; 90 #endif 91 92 /* 93 * Functions implemented using PROC_ACTION(): 94 * 95 * proc_read_regs(proc, regs) 96 * Get the current user-visible register set from the process 97 * and copy it into the regs structure (<machine/reg.h>). 98 * The process is stopped at the time read_regs is called. 99 * 100 * proc_write_regs(proc, regs) 101 * Update the current register set from the passed in regs 102 * structure. Take care to avoid clobbering special CPU 103 * registers or privileged bits in the PSL. 104 * Depending on the architecture this may have fix-up work to do, 105 * especially if the IAR or PCW are modified. 106 * The process is stopped at the time write_regs is called. 107 * 108 * proc_read_fpregs, proc_write_fpregs 109 * deal with the floating point register set, otherwise as above. 110 * 111 * proc_read_dbregs, proc_write_dbregs 112 * deal with the processor debug register set, otherwise as above. 113 * 114 * proc_sstep(proc) 115 * Arrange for the process to trap after executing a single instruction. 116 */ 117 118 #define PROC_ACTION(action) do { \ 119 int error; \ 120 \ 121 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 122 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 123 error = EIO; \ 124 else \ 125 error = (action); \ 126 return (error); \ 127 } while(0) 128 129 int 130 proc_read_regs(struct thread *td, struct reg *regs) 131 { 132 133 PROC_ACTION(fill_regs(td, regs)); 134 } 135 136 int 137 proc_write_regs(struct thread *td, struct reg *regs) 138 { 139 140 PROC_ACTION(set_regs(td, regs)); 141 } 142 143 int 144 proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 145 { 146 147 PROC_ACTION(fill_dbregs(td, dbregs)); 148 } 149 150 int 151 proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 152 { 153 154 PROC_ACTION(set_dbregs(td, dbregs)); 155 } 156 157 /* 158 * Ptrace doesn't support fpregs at all, and there are no security holes 159 * or translations for fpregs, so we can just copy them. 160 */ 161 int 162 proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 163 { 164 165 PROC_ACTION(fill_fpregs(td, fpregs)); 166 } 167 168 int 169 proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 170 { 171 172 PROC_ACTION(set_fpregs(td, fpregs)); 173 } 174 175 #ifdef COMPAT_FREEBSD32 176 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 177 int 178 proc_read_regs32(struct thread *td, struct reg32 *regs32) 179 { 180 181 PROC_ACTION(fill_regs32(td, regs32)); 182 } 183 184 int 185 proc_write_regs32(struct thread *td, struct reg32 *regs32) 186 { 187 188 PROC_ACTION(set_regs32(td, regs32)); 189 } 190 191 int 192 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 193 { 194 195 PROC_ACTION(fill_dbregs32(td, dbregs32)); 196 } 197 198 int 199 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 200 { 201 202 PROC_ACTION(set_dbregs32(td, dbregs32)); 203 } 204 205 int 206 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 207 { 208 209 PROC_ACTION(fill_fpregs32(td, fpregs32)); 210 } 211 212 int 213 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 214 { 215 216 PROC_ACTION(set_fpregs32(td, fpregs32)); 217 } 218 #endif 219 220 int 221 proc_sstep(struct thread *td) 222 { 223 224 PROC_ACTION(ptrace_single_step(td)); 225 } 226 227 int 228 proc_rwmem(struct proc *p, struct uio *uio) 229 { 230 vm_map_t map; 231 vm_offset_t pageno; /* page number */ 232 vm_prot_t reqprot; 233 int error, fault_flags, page_offset, writing; 234 235 /* 236 * Assert that someone has locked this vmspace. (Should be 237 * curthread but we can't assert that.) This keeps the process 238 * from exiting out from under us until this operation completes. 239 */ 240 PROC_ASSERT_HELD(p); 241 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 242 243 /* 244 * The map we want... 245 */ 246 map = &p->p_vmspace->vm_map; 247 248 /* 249 * If we are writing, then we request vm_fault() to create a private 250 * copy of each page. Since these copies will not be writeable by the 251 * process, we must explicity request that they be dirtied. 252 */ 253 writing = uio->uio_rw == UIO_WRITE; 254 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 255 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 256 257 /* 258 * Only map in one page at a time. We don't have to, but it 259 * makes things easier. This way is trivial - right? 260 */ 261 do { 262 vm_offset_t uva; 263 u_int len; 264 vm_page_t m; 265 266 uva = (vm_offset_t)uio->uio_offset; 267 268 /* 269 * Get the page number of this segment. 270 */ 271 pageno = trunc_page(uva); 272 page_offset = uva - pageno; 273 274 /* 275 * How many bytes to copy 276 */ 277 len = min(PAGE_SIZE - page_offset, uio->uio_resid); 278 279 /* 280 * Fault and hold the page on behalf of the process. 281 */ 282 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m); 283 if (error != KERN_SUCCESS) { 284 if (error == KERN_RESOURCE_SHORTAGE) 285 error = ENOMEM; 286 else 287 error = EFAULT; 288 break; 289 } 290 291 /* 292 * Now do the i/o move. 293 */ 294 error = uiomove_fromphys(&m, page_offset, len, uio); 295 296 /* Make the I-cache coherent for breakpoints. */ 297 if (writing && error == 0) { 298 vm_map_lock_read(map); 299 if (vm_map_check_protection(map, pageno, pageno + 300 PAGE_SIZE, VM_PROT_EXECUTE)) 301 vm_sync_icache(map, uva, len); 302 vm_map_unlock_read(map); 303 } 304 305 /* 306 * Release the page. 307 */ 308 vm_page_lock(m); 309 vm_page_unhold(m); 310 vm_page_unlock(m); 311 312 } while (error == 0 && uio->uio_resid > 0); 313 314 return (error); 315 } 316 317 static ssize_t 318 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 319 size_t len, enum uio_rw rw) 320 { 321 struct iovec iov; 322 struct uio uio; 323 ssize_t slen; 324 325 MPASS(len < SSIZE_MAX); 326 slen = (ssize_t)len; 327 328 iov.iov_base = (caddr_t)buf; 329 iov.iov_len = len; 330 uio.uio_iov = &iov; 331 uio.uio_iovcnt = 1; 332 uio.uio_offset = va; 333 uio.uio_resid = slen; 334 uio.uio_segflg = UIO_SYSSPACE; 335 uio.uio_rw = rw; 336 uio.uio_td = td; 337 proc_rwmem(p, &uio); 338 if (uio.uio_resid == slen) 339 return (-1); 340 return (slen - uio.uio_resid); 341 } 342 343 ssize_t 344 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 345 size_t len) 346 { 347 348 return (proc_iop(td, p, va, buf, len, UIO_READ)); 349 } 350 351 ssize_t 352 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 353 size_t len) 354 { 355 356 return (proc_iop(td, p, va, buf, len, UIO_WRITE)); 357 } 358 359 static int 360 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 361 { 362 struct vattr vattr; 363 vm_map_t map; 364 vm_map_entry_t entry; 365 vm_object_t obj, tobj, lobj; 366 struct vmspace *vm; 367 struct vnode *vp; 368 char *freepath, *fullpath; 369 u_int pathlen; 370 int error, index; 371 372 error = 0; 373 obj = NULL; 374 375 vm = vmspace_acquire_ref(p); 376 map = &vm->vm_map; 377 vm_map_lock_read(map); 378 379 do { 380 entry = map->header.next; 381 index = 0; 382 while (index < pve->pve_entry && entry != &map->header) { 383 entry = entry->next; 384 index++; 385 } 386 if (index != pve->pve_entry) { 387 error = EINVAL; 388 break; 389 } 390 while (entry != &map->header && 391 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 392 entry = entry->next; 393 index++; 394 } 395 if (entry == &map->header) { 396 error = ENOENT; 397 break; 398 } 399 400 /* We got an entry. */ 401 pve->pve_entry = index + 1; 402 pve->pve_timestamp = map->timestamp; 403 pve->pve_start = entry->start; 404 pve->pve_end = entry->end - 1; 405 pve->pve_offset = entry->offset; 406 pve->pve_prot = entry->protection; 407 408 /* Backing object's path needed? */ 409 if (pve->pve_pathlen == 0) 410 break; 411 412 pathlen = pve->pve_pathlen; 413 pve->pve_pathlen = 0; 414 415 obj = entry->object.vm_object; 416 if (obj != NULL) 417 VM_OBJECT_RLOCK(obj); 418 } while (0); 419 420 vm_map_unlock_read(map); 421 422 pve->pve_fsid = VNOVAL; 423 pve->pve_fileid = VNOVAL; 424 425 if (error == 0 && obj != NULL) { 426 lobj = obj; 427 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 428 if (tobj != obj) 429 VM_OBJECT_RLOCK(tobj); 430 if (lobj != obj) 431 VM_OBJECT_RUNLOCK(lobj); 432 lobj = tobj; 433 pve->pve_offset += tobj->backing_object_offset; 434 } 435 vp = vm_object_vnode(lobj); 436 if (vp != NULL) 437 vref(vp); 438 if (lobj != obj) 439 VM_OBJECT_RUNLOCK(lobj); 440 VM_OBJECT_RUNLOCK(obj); 441 442 if (vp != NULL) { 443 freepath = NULL; 444 fullpath = NULL; 445 vn_fullpath(td, vp, &fullpath, &freepath); 446 vn_lock(vp, LK_SHARED | LK_RETRY); 447 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 448 pve->pve_fileid = vattr.va_fileid; 449 pve->pve_fsid = vattr.va_fsid; 450 } 451 vput(vp); 452 453 if (fullpath != NULL) { 454 pve->pve_pathlen = strlen(fullpath) + 1; 455 if (pve->pve_pathlen <= pathlen) { 456 error = copyout(fullpath, pve->pve_path, 457 pve->pve_pathlen); 458 } else 459 error = ENAMETOOLONG; 460 } 461 if (freepath != NULL) 462 free(freepath, M_TEMP); 463 } 464 } 465 vmspace_free(vm); 466 if (error == 0) 467 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 468 p->p_pid, pve->pve_entry, pve->pve_start); 469 470 return (error); 471 } 472 473 #ifdef COMPAT_FREEBSD32 474 static int 475 ptrace_vm_entry32(struct thread *td, struct proc *p, 476 struct ptrace_vm_entry32 *pve32) 477 { 478 struct ptrace_vm_entry pve; 479 int error; 480 481 pve.pve_entry = pve32->pve_entry; 482 pve.pve_pathlen = pve32->pve_pathlen; 483 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 484 485 error = ptrace_vm_entry(td, p, &pve); 486 if (error == 0) { 487 pve32->pve_entry = pve.pve_entry; 488 pve32->pve_timestamp = pve.pve_timestamp; 489 pve32->pve_start = pve.pve_start; 490 pve32->pve_end = pve.pve_end; 491 pve32->pve_offset = pve.pve_offset; 492 pve32->pve_prot = pve.pve_prot; 493 pve32->pve_fileid = pve.pve_fileid; 494 pve32->pve_fsid = pve.pve_fsid; 495 } 496 497 pve32->pve_pathlen = pve.pve_pathlen; 498 return (error); 499 } 500 501 static void 502 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 503 struct ptrace_lwpinfo32 *pl32) 504 { 505 506 bzero(pl32, sizeof(*pl32)); 507 pl32->pl_lwpid = pl->pl_lwpid; 508 pl32->pl_event = pl->pl_event; 509 pl32->pl_flags = pl->pl_flags; 510 pl32->pl_sigmask = pl->pl_sigmask; 511 pl32->pl_siglist = pl->pl_siglist; 512 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 513 strcpy(pl32->pl_tdname, pl->pl_tdname); 514 pl32->pl_child_pid = pl->pl_child_pid; 515 pl32->pl_syscall_code = pl->pl_syscall_code; 516 pl32->pl_syscall_narg = pl->pl_syscall_narg; 517 } 518 #endif /* COMPAT_FREEBSD32 */ 519 520 /* 521 * Process debugging system call. 522 */ 523 #ifndef _SYS_SYSPROTO_H_ 524 struct ptrace_args { 525 int req; 526 pid_t pid; 527 caddr_t addr; 528 int data; 529 }; 530 #endif 531 532 #ifdef COMPAT_FREEBSD32 533 /* 534 * This CPP subterfuge is to try and reduce the number of ifdefs in 535 * the body of the code. 536 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 537 * becomes either: 538 * copyin(uap->addr, &r.reg, sizeof r.reg); 539 * or 540 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 541 * .. except this is done at runtime. 542 */ 543 #define COPYIN(u, k, s) wrap32 ? \ 544 copyin(u, k ## 32, s ## 32) : \ 545 copyin(u, k, s) 546 #define COPYOUT(k, u, s) wrap32 ? \ 547 copyout(k ## 32, u, s ## 32) : \ 548 copyout(k, u, s) 549 #else 550 #define COPYIN(u, k, s) copyin(u, k, s) 551 #define COPYOUT(k, u, s) copyout(k, u, s) 552 #endif 553 int 554 sys_ptrace(struct thread *td, struct ptrace_args *uap) 555 { 556 /* 557 * XXX this obfuscation is to reduce stack usage, but the register 558 * structs may be too large to put on the stack anyway. 559 */ 560 union { 561 struct ptrace_io_desc piod; 562 struct ptrace_lwpinfo pl; 563 struct ptrace_vm_entry pve; 564 struct dbreg dbreg; 565 struct fpreg fpreg; 566 struct reg reg; 567 #ifdef COMPAT_FREEBSD32 568 struct dbreg32 dbreg32; 569 struct fpreg32 fpreg32; 570 struct reg32 reg32; 571 struct ptrace_io_desc32 piod32; 572 struct ptrace_lwpinfo32 pl32; 573 struct ptrace_vm_entry32 pve32; 574 #endif 575 char args[nitems(td->td_sa.args) * sizeof(register_t)]; 576 int ptevents; 577 } r; 578 void *addr; 579 int error = 0; 580 #ifdef COMPAT_FREEBSD32 581 int wrap32 = 0; 582 583 if (SV_CURPROC_FLAG(SV_ILP32)) 584 wrap32 = 1; 585 #endif 586 AUDIT_ARG_PID(uap->pid); 587 AUDIT_ARG_CMD(uap->req); 588 AUDIT_ARG_VALUE(uap->data); 589 addr = &r; 590 switch (uap->req) { 591 case PT_GET_EVENT_MASK: 592 case PT_GETREGS: 593 case PT_GETFPREGS: 594 case PT_GETDBREGS: 595 case PT_LWPINFO: 596 case PT_GET_SC_ARGS: 597 break; 598 case PT_SETREGS: 599 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 600 break; 601 case PT_SETFPREGS: 602 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 603 break; 604 case PT_SETDBREGS: 605 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 606 break; 607 case PT_SET_EVENT_MASK: 608 if (uap->data != sizeof(r.ptevents)) 609 error = EINVAL; 610 else 611 error = copyin(uap->addr, &r.ptevents, uap->data); 612 break; 613 case PT_IO: 614 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 615 break; 616 case PT_VM_ENTRY: 617 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 618 break; 619 default: 620 addr = uap->addr; 621 break; 622 } 623 if (error) 624 return (error); 625 626 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 627 if (error) 628 return (error); 629 630 switch (uap->req) { 631 case PT_VM_ENTRY: 632 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 633 break; 634 case PT_IO: 635 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 636 break; 637 case PT_GETREGS: 638 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 639 break; 640 case PT_GETFPREGS: 641 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 642 break; 643 case PT_GETDBREGS: 644 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 645 break; 646 case PT_GET_EVENT_MASK: 647 /* NB: The size in uap->data is validated in kern_ptrace(). */ 648 error = copyout(&r.ptevents, uap->addr, uap->data); 649 break; 650 case PT_LWPINFO: 651 /* NB: The size in uap->data is validated in kern_ptrace(). */ 652 error = copyout(&r.pl, uap->addr, uap->data); 653 break; 654 case PT_GET_SC_ARGS: 655 error = copyout(r.args, uap->addr, MIN(uap->data, 656 sizeof(r.args))); 657 break; 658 } 659 660 return (error); 661 } 662 #undef COPYIN 663 #undef COPYOUT 664 665 #ifdef COMPAT_FREEBSD32 666 /* 667 * PROC_READ(regs, td2, addr); 668 * becomes either: 669 * proc_read_regs(td2, addr); 670 * or 671 * proc_read_regs32(td2, addr); 672 * .. except this is done at runtime. There is an additional 673 * complication in that PROC_WRITE disallows 32 bit consumers 674 * from writing to 64 bit address space targets. 675 */ 676 #define PROC_READ(w, t, a) wrap32 ? \ 677 proc_read_ ## w ## 32(t, a) : \ 678 proc_read_ ## w (t, a) 679 #define PROC_WRITE(w, t, a) wrap32 ? \ 680 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 681 proc_write_ ## w (t, a) 682 #else 683 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 684 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 685 #endif 686 687 void 688 proc_set_traced(struct proc *p, bool stop) 689 { 690 691 PROC_LOCK_ASSERT(p, MA_OWNED); 692 p->p_flag |= P_TRACED; 693 if (stop) 694 p->p_flag2 |= P2_PTRACE_FSTP; 695 p->p_ptevents = PTRACE_DEFAULT; 696 p->p_oppid = p->p_pptr->p_pid; 697 } 698 699 int 700 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 701 { 702 struct iovec iov; 703 struct uio uio; 704 struct proc *curp, *p, *pp; 705 struct thread *td2 = NULL, *td3; 706 struct ptrace_io_desc *piod = NULL; 707 struct ptrace_lwpinfo *pl; 708 int error, num, tmp; 709 int proctree_locked = 0; 710 lwpid_t tid = 0, *buf; 711 #ifdef COMPAT_FREEBSD32 712 int wrap32 = 0, safe = 0; 713 struct ptrace_io_desc32 *piod32 = NULL; 714 struct ptrace_lwpinfo32 *pl32 = NULL; 715 struct ptrace_lwpinfo plr; 716 #endif 717 718 curp = td->td_proc; 719 720 /* Lock proctree before locking the process. */ 721 switch (req) { 722 case PT_TRACE_ME: 723 case PT_ATTACH: 724 case PT_STEP: 725 case PT_CONTINUE: 726 case PT_TO_SCE: 727 case PT_TO_SCX: 728 case PT_SYSCALL: 729 case PT_FOLLOW_FORK: 730 case PT_LWP_EVENTS: 731 case PT_GET_EVENT_MASK: 732 case PT_SET_EVENT_MASK: 733 case PT_DETACH: 734 case PT_GET_SC_ARGS: 735 sx_xlock(&proctree_lock); 736 proctree_locked = 1; 737 break; 738 default: 739 break; 740 } 741 742 if (req == PT_TRACE_ME) { 743 p = td->td_proc; 744 PROC_LOCK(p); 745 } else { 746 if (pid <= PID_MAX) { 747 if ((p = pfind(pid)) == NULL) { 748 if (proctree_locked) 749 sx_xunlock(&proctree_lock); 750 return (ESRCH); 751 } 752 } else { 753 td2 = tdfind(pid, -1); 754 if (td2 == NULL) { 755 if (proctree_locked) 756 sx_xunlock(&proctree_lock); 757 return (ESRCH); 758 } 759 p = td2->td_proc; 760 tid = pid; 761 pid = p->p_pid; 762 } 763 } 764 AUDIT_ARG_PROCESS(p); 765 766 if ((p->p_flag & P_WEXIT) != 0) { 767 error = ESRCH; 768 goto fail; 769 } 770 if ((error = p_cansee(td, p)) != 0) 771 goto fail; 772 773 if ((error = p_candebug(td, p)) != 0) 774 goto fail; 775 776 /* 777 * System processes can't be debugged. 778 */ 779 if ((p->p_flag & P_SYSTEM) != 0) { 780 error = EINVAL; 781 goto fail; 782 } 783 784 if (tid == 0) { 785 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 786 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 787 td2 = p->p_xthread; 788 } else { 789 td2 = FIRST_THREAD_IN_PROC(p); 790 } 791 tid = td2->td_tid; 792 } 793 794 #ifdef COMPAT_FREEBSD32 795 /* 796 * Test if we're a 32 bit client and what the target is. 797 * Set the wrap controls accordingly. 798 */ 799 if (SV_CURPROC_FLAG(SV_ILP32)) { 800 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 801 safe = 1; 802 wrap32 = 1; 803 } 804 #endif 805 /* 806 * Permissions check 807 */ 808 switch (req) { 809 case PT_TRACE_ME: 810 /* 811 * Always legal, when there is a parent process which 812 * could trace us. Otherwise, reject. 813 */ 814 if ((p->p_flag & P_TRACED) != 0) { 815 error = EBUSY; 816 goto fail; 817 } 818 if (p->p_pptr == initproc) { 819 error = EPERM; 820 goto fail; 821 } 822 break; 823 824 case PT_ATTACH: 825 /* Self */ 826 if (p == td->td_proc) { 827 error = EINVAL; 828 goto fail; 829 } 830 831 /* Already traced */ 832 if (p->p_flag & P_TRACED) { 833 error = EBUSY; 834 goto fail; 835 } 836 837 /* Can't trace an ancestor if you're being traced. */ 838 if (curp->p_flag & P_TRACED) { 839 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 840 if (pp == p) { 841 error = EINVAL; 842 goto fail; 843 } 844 } 845 } 846 847 848 /* OK */ 849 break; 850 851 case PT_CLEARSTEP: 852 /* Allow thread to clear single step for itself */ 853 if (td->td_tid == tid) 854 break; 855 856 /* FALLTHROUGH */ 857 default: 858 /* not being traced... */ 859 if ((p->p_flag & P_TRACED) == 0) { 860 error = EPERM; 861 goto fail; 862 } 863 864 /* not being traced by YOU */ 865 if (p->p_pptr != td->td_proc) { 866 error = EBUSY; 867 goto fail; 868 } 869 870 /* not currently stopped */ 871 if ((p->p_flag & P_STOPPED_TRACE) == 0 || 872 p->p_suspcount != p->p_numthreads || 873 (p->p_flag & P_WAITED) == 0) { 874 error = EBUSY; 875 goto fail; 876 } 877 878 /* OK */ 879 break; 880 } 881 882 /* Keep this process around until we finish this request. */ 883 _PHOLD(p); 884 885 #ifdef FIX_SSTEP 886 /* 887 * Single step fixup ala procfs 888 */ 889 FIX_SSTEP(td2); 890 #endif 891 892 /* 893 * Actually do the requests 894 */ 895 896 td->td_retval[0] = 0; 897 898 switch (req) { 899 case PT_TRACE_ME: 900 /* set my trace flag and "owner" so it can read/write me */ 901 proc_set_traced(p, false); 902 if (p->p_flag & P_PPWAIT) 903 p->p_flag |= P_PPTRACE; 904 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 905 break; 906 907 case PT_ATTACH: 908 /* security check done above */ 909 /* 910 * It would be nice if the tracing relationship was separate 911 * from the parent relationship but that would require 912 * another set of links in the proc struct or for "wait" 913 * to scan the entire proc table. To make life easier, 914 * we just re-parent the process we're trying to trace. 915 * The old parent is remembered so we can put things back 916 * on a "detach". 917 */ 918 proc_set_traced(p, true); 919 if (p->p_pptr != td->td_proc) { 920 proc_reparent(p, td->td_proc); 921 } 922 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 923 p->p_oppid); 924 925 sx_xunlock(&proctree_lock); 926 proctree_locked = 0; 927 MPASS(p->p_xthread == NULL); 928 MPASS((p->p_flag & P_STOPPED_TRACE) == 0); 929 930 /* 931 * If already stopped due to a stop signal, clear the 932 * existing stop before triggering a traced SIGSTOP. 933 */ 934 if ((p->p_flag & P_STOPPED_SIG) != 0) { 935 PROC_SLOCK(p); 936 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED); 937 thread_unsuspend(p); 938 PROC_SUNLOCK(p); 939 } 940 941 kern_psignal(p, SIGSTOP); 942 break; 943 944 case PT_CLEARSTEP: 945 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 946 p->p_pid); 947 error = ptrace_clear_single_step(td2); 948 break; 949 950 case PT_SETSTEP: 951 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 952 p->p_pid); 953 error = ptrace_single_step(td2); 954 break; 955 956 case PT_SUSPEND: 957 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 958 p->p_pid); 959 td2->td_dbgflags |= TDB_SUSPEND; 960 thread_lock(td2); 961 td2->td_flags |= TDF_NEEDSUSPCHK; 962 thread_unlock(td2); 963 break; 964 965 case PT_RESUME: 966 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 967 p->p_pid); 968 td2->td_dbgflags &= ~TDB_SUSPEND; 969 break; 970 971 case PT_FOLLOW_FORK: 972 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 973 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 974 data ? "enabled" : "disabled"); 975 if (data) 976 p->p_ptevents |= PTRACE_FORK; 977 else 978 p->p_ptevents &= ~PTRACE_FORK; 979 break; 980 981 case PT_LWP_EVENTS: 982 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 983 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 984 data ? "enabled" : "disabled"); 985 if (data) 986 p->p_ptevents |= PTRACE_LWP; 987 else 988 p->p_ptevents &= ~PTRACE_LWP; 989 break; 990 991 case PT_GET_EVENT_MASK: 992 if (data != sizeof(p->p_ptevents)) { 993 error = EINVAL; 994 break; 995 } 996 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 997 p->p_ptevents); 998 *(int *)addr = p->p_ptevents; 999 break; 1000 1001 case PT_SET_EVENT_MASK: 1002 if (data != sizeof(p->p_ptevents)) { 1003 error = EINVAL; 1004 break; 1005 } 1006 tmp = *(int *)addr; 1007 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 1008 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 1009 error = EINVAL; 1010 break; 1011 } 1012 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1013 p->p_pid, p->p_ptevents, tmp); 1014 p->p_ptevents = tmp; 1015 break; 1016 1017 case PT_GET_SC_ARGS: 1018 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1019 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1020 #ifdef COMPAT_FREEBSD32 1021 || (wrap32 && !safe) 1022 #endif 1023 ) { 1024 error = EINVAL; 1025 break; 1026 } 1027 bzero(addr, sizeof(td2->td_sa.args)); 1028 #ifdef COMPAT_FREEBSD32 1029 if (wrap32) 1030 for (num = 0; num < nitems(td2->td_sa.args); num++) 1031 ((uint32_t *)addr)[num] = (uint32_t) 1032 td2->td_sa.args[num]; 1033 else 1034 #endif 1035 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1036 sizeof(register_t)); 1037 break; 1038 1039 case PT_STEP: 1040 case PT_CONTINUE: 1041 case PT_TO_SCE: 1042 case PT_TO_SCX: 1043 case PT_SYSCALL: 1044 case PT_DETACH: 1045 /* Zero means do not send any signal */ 1046 if (data < 0 || data > _SIG_MAXSIG) { 1047 error = EINVAL; 1048 break; 1049 } 1050 1051 switch (req) { 1052 case PT_STEP: 1053 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1054 td2->td_tid, p->p_pid, data); 1055 error = ptrace_single_step(td2); 1056 if (error) 1057 goto out; 1058 break; 1059 case PT_CONTINUE: 1060 case PT_TO_SCE: 1061 case PT_TO_SCX: 1062 case PT_SYSCALL: 1063 if (addr != (void *)1) { 1064 error = ptrace_set_pc(td2, 1065 (u_long)(uintfptr_t)addr); 1066 if (error) 1067 goto out; 1068 } 1069 switch (req) { 1070 case PT_TO_SCE: 1071 p->p_ptevents |= PTRACE_SCE; 1072 CTR4(KTR_PTRACE, 1073 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1074 p->p_pid, p->p_ptevents, 1075 (u_long)(uintfptr_t)addr, data); 1076 break; 1077 case PT_TO_SCX: 1078 p->p_ptevents |= PTRACE_SCX; 1079 CTR4(KTR_PTRACE, 1080 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1081 p->p_pid, p->p_ptevents, 1082 (u_long)(uintfptr_t)addr, data); 1083 break; 1084 case PT_SYSCALL: 1085 p->p_ptevents |= PTRACE_SYSCALL; 1086 CTR4(KTR_PTRACE, 1087 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1088 p->p_pid, p->p_ptevents, 1089 (u_long)(uintfptr_t)addr, data); 1090 break; 1091 case PT_CONTINUE: 1092 CTR3(KTR_PTRACE, 1093 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1094 p->p_pid, (u_long)(uintfptr_t)addr, data); 1095 break; 1096 } 1097 break; 1098 case PT_DETACH: 1099 /* 1100 * Reset the process parent. 1101 * 1102 * NB: This clears P_TRACED before reparenting 1103 * a detached process back to its original 1104 * parent. Otherwise the debugee will be set 1105 * as an orphan of the debugger. 1106 */ 1107 p->p_flag &= ~(P_TRACED | P_WAITED); 1108 if (p->p_oppid != p->p_pptr->p_pid) { 1109 PROC_LOCK(p->p_pptr); 1110 sigqueue_take(p->p_ksi); 1111 PROC_UNLOCK(p->p_pptr); 1112 1113 pp = proc_realparent(p); 1114 proc_reparent(p, pp); 1115 if (pp == initproc) 1116 p->p_sigparent = SIGCHLD; 1117 CTR3(KTR_PTRACE, 1118 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1119 p->p_pid, pp->p_pid, data); 1120 } else 1121 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1122 p->p_pid, data); 1123 p->p_oppid = 0; 1124 p->p_ptevents = 0; 1125 FOREACH_THREAD_IN_PROC(p, td3) { 1126 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1127 sigqueue_delete(&td3->td_sigqueue, 1128 SIGSTOP); 1129 } 1130 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP | 1131 TDB_SUSPEND); 1132 } 1133 1134 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1135 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1136 p->p_flag2 &= ~P2_PTRACE_FSTP; 1137 } 1138 1139 /* should we send SIGCHLD? */ 1140 /* childproc_continued(p); */ 1141 break; 1142 } 1143 1144 sx_xunlock(&proctree_lock); 1145 proctree_locked = 0; 1146 1147 sendsig: 1148 MPASS(proctree_locked == 0); 1149 1150 /* 1151 * Clear the pending event for the thread that just 1152 * reported its event (p_xthread). This may not be 1153 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1154 * the debugger is resuming a different thread. 1155 * 1156 * Deliver any pending signal via the reporting thread. 1157 */ 1158 MPASS(p->p_xthread != NULL); 1159 p->p_xthread->td_dbgflags &= ~TDB_XSIG; 1160 p->p_xthread->td_xsig = data; 1161 p->p_xthread = NULL; 1162 p->p_xsig = data; 1163 1164 /* 1165 * P_WKILLED is insurance that a PT_KILL/SIGKILL 1166 * always works immediately, even if another thread is 1167 * unsuspended first and attempts to handle a 1168 * different signal or if the POSIX.1b style signal 1169 * queue cannot accommodate any new signals. 1170 */ 1171 if (data == SIGKILL) 1172 p->p_flag |= P_WKILLED; 1173 1174 /* 1175 * Unsuspend all threads. To leave a thread 1176 * suspended, use PT_SUSPEND to suspend it before 1177 * continuing the process. 1178 */ 1179 PROC_SLOCK(p); 1180 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED); 1181 thread_unsuspend(p); 1182 PROC_SUNLOCK(p); 1183 break; 1184 1185 case PT_WRITE_I: 1186 case PT_WRITE_D: 1187 td2->td_dbgflags |= TDB_USERWR; 1188 PROC_UNLOCK(p); 1189 error = 0; 1190 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1191 sizeof(int)) != sizeof(int)) 1192 error = ENOMEM; 1193 else 1194 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1195 p->p_pid, addr, data); 1196 PROC_LOCK(p); 1197 break; 1198 1199 case PT_READ_I: 1200 case PT_READ_D: 1201 PROC_UNLOCK(p); 1202 error = tmp = 0; 1203 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1204 sizeof(int)) != sizeof(int)) 1205 error = ENOMEM; 1206 else 1207 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1208 p->p_pid, addr, tmp); 1209 td->td_retval[0] = tmp; 1210 PROC_LOCK(p); 1211 break; 1212 1213 case PT_IO: 1214 #ifdef COMPAT_FREEBSD32 1215 if (wrap32) { 1216 piod32 = addr; 1217 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1218 iov.iov_len = piod32->piod_len; 1219 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1220 uio.uio_resid = piod32->piod_len; 1221 } else 1222 #endif 1223 { 1224 piod = addr; 1225 iov.iov_base = piod->piod_addr; 1226 iov.iov_len = piod->piod_len; 1227 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1228 uio.uio_resid = piod->piod_len; 1229 } 1230 uio.uio_iov = &iov; 1231 uio.uio_iovcnt = 1; 1232 uio.uio_segflg = UIO_USERSPACE; 1233 uio.uio_td = td; 1234 #ifdef COMPAT_FREEBSD32 1235 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1236 #else 1237 tmp = piod->piod_op; 1238 #endif 1239 switch (tmp) { 1240 case PIOD_READ_D: 1241 case PIOD_READ_I: 1242 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1243 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1244 uio.uio_rw = UIO_READ; 1245 break; 1246 case PIOD_WRITE_D: 1247 case PIOD_WRITE_I: 1248 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1249 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1250 td2->td_dbgflags |= TDB_USERWR; 1251 uio.uio_rw = UIO_WRITE; 1252 break; 1253 default: 1254 error = EINVAL; 1255 goto out; 1256 } 1257 PROC_UNLOCK(p); 1258 error = proc_rwmem(p, &uio); 1259 #ifdef COMPAT_FREEBSD32 1260 if (wrap32) 1261 piod32->piod_len -= uio.uio_resid; 1262 else 1263 #endif 1264 piod->piod_len -= uio.uio_resid; 1265 PROC_LOCK(p); 1266 break; 1267 1268 case PT_KILL: 1269 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1270 data = SIGKILL; 1271 goto sendsig; /* in PT_CONTINUE above */ 1272 1273 case PT_SETREGS: 1274 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1275 p->p_pid); 1276 td2->td_dbgflags |= TDB_USERWR; 1277 error = PROC_WRITE(regs, td2, addr); 1278 break; 1279 1280 case PT_GETREGS: 1281 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1282 p->p_pid); 1283 error = PROC_READ(regs, td2, addr); 1284 break; 1285 1286 case PT_SETFPREGS: 1287 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1288 p->p_pid); 1289 td2->td_dbgflags |= TDB_USERWR; 1290 error = PROC_WRITE(fpregs, td2, addr); 1291 break; 1292 1293 case PT_GETFPREGS: 1294 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1295 p->p_pid); 1296 error = PROC_READ(fpregs, td2, addr); 1297 break; 1298 1299 case PT_SETDBREGS: 1300 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1301 p->p_pid); 1302 td2->td_dbgflags |= TDB_USERWR; 1303 error = PROC_WRITE(dbregs, td2, addr); 1304 break; 1305 1306 case PT_GETDBREGS: 1307 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1308 p->p_pid); 1309 error = PROC_READ(dbregs, td2, addr); 1310 break; 1311 1312 case PT_LWPINFO: 1313 if (data <= 0 || 1314 #ifdef COMPAT_FREEBSD32 1315 (!wrap32 && data > sizeof(*pl)) || 1316 (wrap32 && data > sizeof(*pl32))) { 1317 #else 1318 data > sizeof(*pl)) { 1319 #endif 1320 error = EINVAL; 1321 break; 1322 } 1323 #ifdef COMPAT_FREEBSD32 1324 if (wrap32) { 1325 pl = &plr; 1326 pl32 = addr; 1327 } else 1328 #endif 1329 pl = addr; 1330 bzero(pl, sizeof(*pl)); 1331 pl->pl_lwpid = td2->td_tid; 1332 pl->pl_event = PL_EVENT_NONE; 1333 pl->pl_flags = 0; 1334 if (td2->td_dbgflags & TDB_XSIG) { 1335 pl->pl_event = PL_EVENT_SIGNAL; 1336 if (td2->td_si.si_signo != 0 && 1337 #ifdef COMPAT_FREEBSD32 1338 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1339 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1340 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1341 pl_siginfo) + sizeof(struct siginfo32))) 1342 #else 1343 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1344 + sizeof(pl->pl_siginfo) 1345 #endif 1346 ){ 1347 pl->pl_flags |= PL_FLAG_SI; 1348 pl->pl_siginfo = td2->td_si; 1349 } 1350 } 1351 if (td2->td_dbgflags & TDB_SCE) 1352 pl->pl_flags |= PL_FLAG_SCE; 1353 else if (td2->td_dbgflags & TDB_SCX) 1354 pl->pl_flags |= PL_FLAG_SCX; 1355 if (td2->td_dbgflags & TDB_EXEC) 1356 pl->pl_flags |= PL_FLAG_EXEC; 1357 if (td2->td_dbgflags & TDB_FORK) { 1358 pl->pl_flags |= PL_FLAG_FORKED; 1359 pl->pl_child_pid = td2->td_dbg_forked; 1360 if (td2->td_dbgflags & TDB_VFORK) 1361 pl->pl_flags |= PL_FLAG_VFORKED; 1362 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1363 TDB_VFORK) 1364 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1365 if (td2->td_dbgflags & TDB_CHILD) 1366 pl->pl_flags |= PL_FLAG_CHILD; 1367 if (td2->td_dbgflags & TDB_BORN) 1368 pl->pl_flags |= PL_FLAG_BORN; 1369 if (td2->td_dbgflags & TDB_EXIT) 1370 pl->pl_flags |= PL_FLAG_EXITED; 1371 pl->pl_sigmask = td2->td_sigmask; 1372 pl->pl_siglist = td2->td_siglist; 1373 strcpy(pl->pl_tdname, td2->td_name); 1374 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1375 pl->pl_syscall_code = td2->td_sa.code; 1376 pl->pl_syscall_narg = td2->td_sa.narg; 1377 } else { 1378 pl->pl_syscall_code = 0; 1379 pl->pl_syscall_narg = 0; 1380 } 1381 #ifdef COMPAT_FREEBSD32 1382 if (wrap32) 1383 ptrace_lwpinfo_to32(pl, pl32); 1384 #endif 1385 CTR6(KTR_PTRACE, 1386 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1387 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1388 pl->pl_child_pid, pl->pl_syscall_code); 1389 break; 1390 1391 case PT_GETNUMLWPS: 1392 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1393 p->p_numthreads); 1394 td->td_retval[0] = p->p_numthreads; 1395 break; 1396 1397 case PT_GETLWPLIST: 1398 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1399 p->p_pid, data, p->p_numthreads); 1400 if (data <= 0) { 1401 error = EINVAL; 1402 break; 1403 } 1404 num = imin(p->p_numthreads, data); 1405 PROC_UNLOCK(p); 1406 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1407 tmp = 0; 1408 PROC_LOCK(p); 1409 FOREACH_THREAD_IN_PROC(p, td2) { 1410 if (tmp >= num) 1411 break; 1412 buf[tmp++] = td2->td_tid; 1413 } 1414 PROC_UNLOCK(p); 1415 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1416 free(buf, M_TEMP); 1417 if (!error) 1418 td->td_retval[0] = tmp; 1419 PROC_LOCK(p); 1420 break; 1421 1422 case PT_VM_TIMESTAMP: 1423 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1424 p->p_pid, p->p_vmspace->vm_map.timestamp); 1425 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1426 break; 1427 1428 case PT_VM_ENTRY: 1429 PROC_UNLOCK(p); 1430 #ifdef COMPAT_FREEBSD32 1431 if (wrap32) 1432 error = ptrace_vm_entry32(td, p, addr); 1433 else 1434 #endif 1435 error = ptrace_vm_entry(td, p, addr); 1436 PROC_LOCK(p); 1437 break; 1438 1439 default: 1440 #ifdef __HAVE_PTRACE_MACHDEP 1441 if (req >= PT_FIRSTMACH) { 1442 PROC_UNLOCK(p); 1443 error = cpu_ptrace(td2, req, addr, data); 1444 PROC_LOCK(p); 1445 } else 1446 #endif 1447 /* Unknown request. */ 1448 error = EINVAL; 1449 break; 1450 } 1451 1452 out: 1453 /* Drop our hold on this process now that the request has completed. */ 1454 _PRELE(p); 1455 fail: 1456 PROC_UNLOCK(p); 1457 if (proctree_locked) 1458 sx_xunlock(&proctree_lock); 1459 return (error); 1460 } 1461 #undef PROC_READ 1462 #undef PROC_WRITE 1463 1464 /* 1465 * Stop a process because of a debugging event; 1466 * stay stopped until p->p_step is cleared 1467 * (cleared by PIOCCONT in procfs). 1468 */ 1469 void 1470 stopevent(struct proc *p, unsigned int event, unsigned int val) 1471 { 1472 1473 PROC_LOCK_ASSERT(p, MA_OWNED); 1474 p->p_step = 1; 1475 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1476 val); 1477 do { 1478 if (event != S_EXIT) 1479 p->p_xsig = val; 1480 p->p_xthread = NULL; 1481 p->p_stype = event; /* Which event caused the stop? */ 1482 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1483 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1484 } while (p->p_step); 1485 } 1486