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/limits.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/syscallsubr.h> 43 #include <sys/sysent.h> 44 #include <sys/sysproto.h> 45 #include <sys/pioctl.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/vnode.h> 49 #include <sys/ptrace.h> 50 #include <sys/rwlock.h> 51 #include <sys/sx.h> 52 #include <sys/malloc.h> 53 #include <sys/signalvar.h> 54 55 #include <machine/reg.h> 56 57 #include <security/audit/audit.h> 58 59 #include <vm/vm.h> 60 #include <vm/pmap.h> 61 #include <vm/vm_extern.h> 62 #include <vm/vm_map.h> 63 #include <vm/vm_kern.h> 64 #include <vm/vm_object.h> 65 #include <vm/vm_page.h> 66 #include <vm/vm_param.h> 67 68 #ifdef COMPAT_FREEBSD32 69 #include <sys/procfs.h> 70 #include <compat/freebsd32/freebsd32_signal.h> 71 72 struct ptrace_io_desc32 { 73 int piod_op; 74 uint32_t piod_offs; 75 uint32_t piod_addr; 76 uint32_t piod_len; 77 }; 78 79 struct ptrace_vm_entry32 { 80 int pve_entry; 81 int pve_timestamp; 82 uint32_t pve_start; 83 uint32_t pve_end; 84 uint32_t pve_offset; 85 u_int pve_prot; 86 u_int pve_pathlen; 87 int32_t pve_fileid; 88 u_int pve_fsid; 89 uint32_t pve_path; 90 }; 91 #endif 92 93 /* 94 * Functions implemented using PROC_ACTION(): 95 * 96 * proc_read_regs(proc, regs) 97 * Get the current user-visible register set from the process 98 * and copy it into the regs structure (<machine/reg.h>). 99 * The process is stopped at the time read_regs is called. 100 * 101 * proc_write_regs(proc, regs) 102 * Update the current register set from the passed in regs 103 * structure. Take care to avoid clobbering special CPU 104 * registers or privileged bits in the PSL. 105 * Depending on the architecture this may have fix-up work to do, 106 * especially if the IAR or PCW are modified. 107 * The process is stopped at the time write_regs is called. 108 * 109 * proc_read_fpregs, proc_write_fpregs 110 * deal with the floating point register set, otherwise as above. 111 * 112 * proc_read_dbregs, proc_write_dbregs 113 * deal with the processor debug register set, otherwise as above. 114 * 115 * proc_sstep(proc) 116 * Arrange for the process to trap after executing a single instruction. 117 */ 118 119 #define PROC_ACTION(action) do { \ 120 int error; \ 121 \ 122 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 123 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 124 error = EIO; \ 125 else \ 126 error = (action); \ 127 return (error); \ 128 } while(0) 129 130 int 131 proc_read_regs(struct thread *td, struct reg *regs) 132 { 133 134 PROC_ACTION(fill_regs(td, regs)); 135 } 136 137 int 138 proc_write_regs(struct thread *td, struct reg *regs) 139 { 140 141 PROC_ACTION(set_regs(td, regs)); 142 } 143 144 int 145 proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 146 { 147 148 PROC_ACTION(fill_dbregs(td, dbregs)); 149 } 150 151 int 152 proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 153 { 154 155 PROC_ACTION(set_dbregs(td, dbregs)); 156 } 157 158 /* 159 * Ptrace doesn't support fpregs at all, and there are no security holes 160 * or translations for fpregs, so we can just copy them. 161 */ 162 int 163 proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 164 { 165 166 PROC_ACTION(fill_fpregs(td, fpregs)); 167 } 168 169 int 170 proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 171 { 172 173 PROC_ACTION(set_fpregs(td, fpregs)); 174 } 175 176 #ifdef COMPAT_FREEBSD32 177 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 178 int 179 proc_read_regs32(struct thread *td, struct reg32 *regs32) 180 { 181 182 PROC_ACTION(fill_regs32(td, regs32)); 183 } 184 185 int 186 proc_write_regs32(struct thread *td, struct reg32 *regs32) 187 { 188 189 PROC_ACTION(set_regs32(td, regs32)); 190 } 191 192 int 193 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 194 { 195 196 PROC_ACTION(fill_dbregs32(td, dbregs32)); 197 } 198 199 int 200 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 201 { 202 203 PROC_ACTION(set_dbregs32(td, dbregs32)); 204 } 205 206 int 207 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 208 { 209 210 PROC_ACTION(fill_fpregs32(td, fpregs32)); 211 } 212 213 int 214 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 215 { 216 217 PROC_ACTION(set_fpregs32(td, fpregs32)); 218 } 219 #endif 220 221 int 222 proc_sstep(struct thread *td) 223 { 224 225 PROC_ACTION(ptrace_single_step(td)); 226 } 227 228 int 229 proc_rwmem(struct proc *p, struct uio *uio) 230 { 231 vm_map_t map; 232 vm_offset_t pageno; /* page number */ 233 vm_prot_t reqprot; 234 int error, fault_flags, page_offset, writing; 235 236 /* 237 * Assert that someone has locked this vmspace. (Should be 238 * curthread but we can't assert that.) This keeps the process 239 * from exiting out from under us until this operation completes. 240 */ 241 PROC_ASSERT_HELD(p); 242 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 243 244 /* 245 * The map we want... 246 */ 247 map = &p->p_vmspace->vm_map; 248 249 /* 250 * If we are writing, then we request vm_fault() to create a private 251 * copy of each page. Since these copies will not be writeable by the 252 * process, we must explicity request that they be dirtied. 253 */ 254 writing = uio->uio_rw == UIO_WRITE; 255 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 256 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 257 258 /* 259 * Only map in one page at a time. We don't have to, but it 260 * makes things easier. This way is trivial - right? 261 */ 262 do { 263 vm_offset_t uva; 264 u_int len; 265 vm_page_t m; 266 267 uva = (vm_offset_t)uio->uio_offset; 268 269 /* 270 * Get the page number of this segment. 271 */ 272 pageno = trunc_page(uva); 273 page_offset = uva - pageno; 274 275 /* 276 * How many bytes to copy 277 */ 278 len = min(PAGE_SIZE - page_offset, uio->uio_resid); 279 280 /* 281 * Fault and hold the page on behalf of the process. 282 */ 283 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m); 284 if (error != KERN_SUCCESS) { 285 if (error == KERN_RESOURCE_SHORTAGE) 286 error = ENOMEM; 287 else 288 error = EFAULT; 289 break; 290 } 291 292 /* 293 * Now do the i/o move. 294 */ 295 error = uiomove_fromphys(&m, page_offset, len, uio); 296 297 /* Make the I-cache coherent for breakpoints. */ 298 if (writing && error == 0) { 299 vm_map_lock_read(map); 300 if (vm_map_check_protection(map, pageno, pageno + 301 PAGE_SIZE, VM_PROT_EXECUTE)) 302 vm_sync_icache(map, uva, len); 303 vm_map_unlock_read(map); 304 } 305 306 /* 307 * Release the page. 308 */ 309 vm_page_lock(m); 310 vm_page_unhold(m); 311 vm_page_unlock(m); 312 313 } while (error == 0 && uio->uio_resid > 0); 314 315 return (error); 316 } 317 318 static ssize_t 319 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 320 size_t len, enum uio_rw rw) 321 { 322 struct iovec iov; 323 struct uio uio; 324 ssize_t slen; 325 326 MPASS(len < SSIZE_MAX); 327 slen = (ssize_t)len; 328 329 iov.iov_base = (caddr_t)buf; 330 iov.iov_len = len; 331 uio.uio_iov = &iov; 332 uio.uio_iovcnt = 1; 333 uio.uio_offset = va; 334 uio.uio_resid = slen; 335 uio.uio_segflg = UIO_SYSSPACE; 336 uio.uio_rw = rw; 337 uio.uio_td = td; 338 proc_rwmem(p, &uio); 339 if (uio.uio_resid == slen) 340 return (-1); 341 return (slen - uio.uio_resid); 342 } 343 344 ssize_t 345 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 346 size_t len) 347 { 348 349 return (proc_iop(td, p, va, buf, len, UIO_READ)); 350 } 351 352 ssize_t 353 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 354 size_t len) 355 { 356 357 return (proc_iop(td, p, va, buf, len, UIO_WRITE)); 358 } 359 360 static int 361 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 362 { 363 struct vattr vattr; 364 vm_map_t map; 365 vm_map_entry_t entry; 366 vm_object_t obj, tobj, lobj; 367 struct vmspace *vm; 368 struct vnode *vp; 369 char *freepath, *fullpath; 370 u_int pathlen; 371 int error, index; 372 373 error = 0; 374 obj = NULL; 375 376 vm = vmspace_acquire_ref(p); 377 map = &vm->vm_map; 378 vm_map_lock_read(map); 379 380 do { 381 entry = map->header.next; 382 index = 0; 383 while (index < pve->pve_entry && entry != &map->header) { 384 entry = entry->next; 385 index++; 386 } 387 if (index != pve->pve_entry) { 388 error = EINVAL; 389 break; 390 } 391 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0, 392 ("Submap in map header")); 393 while ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 394 entry = entry->next; 395 index++; 396 } 397 if (entry == &map->header) { 398 error = ENOENT; 399 break; 400 } 401 402 /* We got an entry. */ 403 pve->pve_entry = index + 1; 404 pve->pve_timestamp = map->timestamp; 405 pve->pve_start = entry->start; 406 pve->pve_end = entry->end - 1; 407 pve->pve_offset = entry->offset; 408 pve->pve_prot = entry->protection; 409 410 /* Backing object's path needed? */ 411 if (pve->pve_pathlen == 0) 412 break; 413 414 pathlen = pve->pve_pathlen; 415 pve->pve_pathlen = 0; 416 417 obj = entry->object.vm_object; 418 if (obj != NULL) 419 VM_OBJECT_RLOCK(obj); 420 } while (0); 421 422 vm_map_unlock_read(map); 423 424 pve->pve_fsid = VNOVAL; 425 pve->pve_fileid = VNOVAL; 426 427 if (error == 0 && obj != NULL) { 428 lobj = obj; 429 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 430 if (tobj != obj) 431 VM_OBJECT_RLOCK(tobj); 432 if (lobj != obj) 433 VM_OBJECT_RUNLOCK(lobj); 434 lobj = tobj; 435 pve->pve_offset += tobj->backing_object_offset; 436 } 437 vp = vm_object_vnode(lobj); 438 if (vp != NULL) 439 vref(vp); 440 if (lobj != obj) 441 VM_OBJECT_RUNLOCK(lobj); 442 VM_OBJECT_RUNLOCK(obj); 443 444 if (vp != NULL) { 445 freepath = NULL; 446 fullpath = NULL; 447 vn_fullpath(td, vp, &fullpath, &freepath); 448 vn_lock(vp, LK_SHARED | LK_RETRY); 449 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 450 pve->pve_fileid = vattr.va_fileid; 451 pve->pve_fsid = vattr.va_fsid; 452 } 453 vput(vp); 454 455 if (fullpath != NULL) { 456 pve->pve_pathlen = strlen(fullpath) + 1; 457 if (pve->pve_pathlen <= pathlen) { 458 error = copyout(fullpath, pve->pve_path, 459 pve->pve_pathlen); 460 } else 461 error = ENAMETOOLONG; 462 } 463 if (freepath != NULL) 464 free(freepath, M_TEMP); 465 } 466 } 467 vmspace_free(vm); 468 if (error == 0) 469 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 470 p->p_pid, pve->pve_entry, pve->pve_start); 471 472 return (error); 473 } 474 475 #ifdef COMPAT_FREEBSD32 476 static int 477 ptrace_vm_entry32(struct thread *td, struct proc *p, 478 struct ptrace_vm_entry32 *pve32) 479 { 480 struct ptrace_vm_entry pve; 481 int error; 482 483 pve.pve_entry = pve32->pve_entry; 484 pve.pve_pathlen = pve32->pve_pathlen; 485 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 486 487 error = ptrace_vm_entry(td, p, &pve); 488 if (error == 0) { 489 pve32->pve_entry = pve.pve_entry; 490 pve32->pve_timestamp = pve.pve_timestamp; 491 pve32->pve_start = pve.pve_start; 492 pve32->pve_end = pve.pve_end; 493 pve32->pve_offset = pve.pve_offset; 494 pve32->pve_prot = pve.pve_prot; 495 pve32->pve_fileid = pve.pve_fileid; 496 pve32->pve_fsid = pve.pve_fsid; 497 } 498 499 pve32->pve_pathlen = pve.pve_pathlen; 500 return (error); 501 } 502 503 static void 504 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 505 struct ptrace_lwpinfo32 *pl32) 506 { 507 508 bzero(pl32, sizeof(*pl32)); 509 pl32->pl_lwpid = pl->pl_lwpid; 510 pl32->pl_event = pl->pl_event; 511 pl32->pl_flags = pl->pl_flags; 512 pl32->pl_sigmask = pl->pl_sigmask; 513 pl32->pl_siglist = pl->pl_siglist; 514 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 515 strcpy(pl32->pl_tdname, pl->pl_tdname); 516 pl32->pl_child_pid = pl->pl_child_pid; 517 pl32->pl_syscall_code = pl->pl_syscall_code; 518 pl32->pl_syscall_narg = pl->pl_syscall_narg; 519 } 520 #endif /* COMPAT_FREEBSD32 */ 521 522 /* 523 * Process debugging system call. 524 */ 525 #ifndef _SYS_SYSPROTO_H_ 526 struct ptrace_args { 527 int req; 528 pid_t pid; 529 caddr_t addr; 530 int data; 531 }; 532 #endif 533 534 #ifdef COMPAT_FREEBSD32 535 /* 536 * This CPP subterfuge is to try and reduce the number of ifdefs in 537 * the body of the code. 538 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 539 * becomes either: 540 * copyin(uap->addr, &r.reg, sizeof r.reg); 541 * or 542 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 543 * .. except this is done at runtime. 544 */ 545 #define BZERO(a, s) wrap32 ? \ 546 bzero(a ## 32, s ## 32) : \ 547 bzero(a, s) 548 #define COPYIN(u, k, s) wrap32 ? \ 549 copyin(u, k ## 32, s ## 32) : \ 550 copyin(u, k, s) 551 #define COPYOUT(k, u, s) wrap32 ? \ 552 copyout(k ## 32, u, s ## 32) : \ 553 copyout(k, u, s) 554 #else 555 #define BZERO(a, s) bzero(a, s) 556 #define COPYIN(u, k, s) copyin(u, k, s) 557 #define COPYOUT(k, u, s) copyout(k, u, s) 558 #endif 559 int 560 sys_ptrace(struct thread *td, struct ptrace_args *uap) 561 { 562 /* 563 * XXX this obfuscation is to reduce stack usage, but the register 564 * structs may be too large to put on the stack anyway. 565 */ 566 union { 567 struct ptrace_io_desc piod; 568 struct ptrace_lwpinfo pl; 569 struct ptrace_vm_entry pve; 570 struct dbreg dbreg; 571 struct fpreg fpreg; 572 struct reg reg; 573 #ifdef COMPAT_FREEBSD32 574 struct dbreg32 dbreg32; 575 struct fpreg32 fpreg32; 576 struct reg32 reg32; 577 struct ptrace_io_desc32 piod32; 578 struct ptrace_lwpinfo32 pl32; 579 struct ptrace_vm_entry32 pve32; 580 #endif 581 char args[sizeof(td->td_sa.args)]; 582 int ptevents; 583 } r; 584 void *addr; 585 int error = 0; 586 #ifdef COMPAT_FREEBSD32 587 int wrap32 = 0; 588 589 if (SV_CURPROC_FLAG(SV_ILP32)) 590 wrap32 = 1; 591 #endif 592 AUDIT_ARG_PID(uap->pid); 593 AUDIT_ARG_CMD(uap->req); 594 AUDIT_ARG_VALUE(uap->data); 595 addr = &r; 596 switch (uap->req) { 597 case PT_GET_EVENT_MASK: 598 case PT_LWPINFO: 599 case PT_GET_SC_ARGS: 600 break; 601 case PT_GETREGS: 602 BZERO(&r.reg, sizeof r.reg); 603 break; 604 case PT_GETFPREGS: 605 BZERO(&r.fpreg, sizeof r.fpreg); 606 break; 607 case PT_GETDBREGS: 608 BZERO(&r.dbreg, sizeof r.dbreg); 609 break; 610 case PT_SETREGS: 611 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 612 break; 613 case PT_SETFPREGS: 614 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 615 break; 616 case PT_SETDBREGS: 617 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 618 break; 619 case PT_SET_EVENT_MASK: 620 if (uap->data != sizeof(r.ptevents)) 621 error = EINVAL; 622 else 623 error = copyin(uap->addr, &r.ptevents, uap->data); 624 break; 625 case PT_IO: 626 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 627 break; 628 case PT_VM_ENTRY: 629 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 630 break; 631 default: 632 addr = uap->addr; 633 break; 634 } 635 if (error) 636 return (error); 637 638 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 639 if (error) 640 return (error); 641 642 switch (uap->req) { 643 case PT_VM_ENTRY: 644 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 645 break; 646 case PT_IO: 647 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 648 break; 649 case PT_GETREGS: 650 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 651 break; 652 case PT_GETFPREGS: 653 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 654 break; 655 case PT_GETDBREGS: 656 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 657 break; 658 case PT_GET_EVENT_MASK: 659 /* NB: The size in uap->data is validated in kern_ptrace(). */ 660 error = copyout(&r.ptevents, uap->addr, uap->data); 661 break; 662 case PT_LWPINFO: 663 /* NB: The size in uap->data is validated in kern_ptrace(). */ 664 error = copyout(&r.pl, uap->addr, uap->data); 665 break; 666 case PT_GET_SC_ARGS: 667 error = copyout(r.args, uap->addr, MIN(uap->data, 668 sizeof(r.args))); 669 break; 670 } 671 672 return (error); 673 } 674 #undef COPYIN 675 #undef COPYOUT 676 #undef BZERO 677 678 #ifdef COMPAT_FREEBSD32 679 /* 680 * PROC_READ(regs, td2, addr); 681 * becomes either: 682 * proc_read_regs(td2, addr); 683 * or 684 * proc_read_regs32(td2, addr); 685 * .. except this is done at runtime. There is an additional 686 * complication in that PROC_WRITE disallows 32 bit consumers 687 * from writing to 64 bit address space targets. 688 */ 689 #define PROC_READ(w, t, a) wrap32 ? \ 690 proc_read_ ## w ## 32(t, a) : \ 691 proc_read_ ## w (t, a) 692 #define PROC_WRITE(w, t, a) wrap32 ? \ 693 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 694 proc_write_ ## w (t, a) 695 #else 696 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 697 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 698 #endif 699 700 void 701 proc_set_traced(struct proc *p, bool stop) 702 { 703 704 sx_assert(&proctree_lock, SX_XLOCKED); 705 PROC_LOCK_ASSERT(p, MA_OWNED); 706 p->p_flag |= P_TRACED; 707 if (stop) 708 p->p_flag2 |= P2_PTRACE_FSTP; 709 p->p_ptevents = PTRACE_DEFAULT; 710 } 711 712 int 713 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 714 { 715 struct iovec iov; 716 struct uio uio; 717 struct proc *curp, *p, *pp; 718 struct thread *td2 = NULL, *td3; 719 struct ptrace_io_desc *piod = NULL; 720 struct ptrace_lwpinfo *pl; 721 int error, num, tmp; 722 int proctree_locked = 0; 723 lwpid_t tid = 0, *buf; 724 #ifdef COMPAT_FREEBSD32 725 int wrap32 = 0, safe = 0; 726 struct ptrace_io_desc32 *piod32 = NULL; 727 struct ptrace_lwpinfo32 *pl32 = NULL; 728 struct ptrace_lwpinfo plr; 729 #endif 730 731 curp = td->td_proc; 732 733 /* Lock proctree before locking the process. */ 734 switch (req) { 735 case PT_TRACE_ME: 736 case PT_ATTACH: 737 case PT_STEP: 738 case PT_CONTINUE: 739 case PT_TO_SCE: 740 case PT_TO_SCX: 741 case PT_SYSCALL: 742 case PT_FOLLOW_FORK: 743 case PT_LWP_EVENTS: 744 case PT_GET_EVENT_MASK: 745 case PT_SET_EVENT_MASK: 746 case PT_DETACH: 747 case PT_GET_SC_ARGS: 748 sx_xlock(&proctree_lock); 749 proctree_locked = 1; 750 break; 751 default: 752 break; 753 } 754 755 if (req == PT_TRACE_ME) { 756 p = td->td_proc; 757 PROC_LOCK(p); 758 } else { 759 if (pid <= PID_MAX) { 760 if ((p = pfind(pid)) == NULL) { 761 if (proctree_locked) 762 sx_xunlock(&proctree_lock); 763 return (ESRCH); 764 } 765 } else { 766 td2 = tdfind(pid, -1); 767 if (td2 == NULL) { 768 if (proctree_locked) 769 sx_xunlock(&proctree_lock); 770 return (ESRCH); 771 } 772 p = td2->td_proc; 773 tid = pid; 774 pid = p->p_pid; 775 } 776 } 777 AUDIT_ARG_PROCESS(p); 778 779 if ((p->p_flag & P_WEXIT) != 0) { 780 error = ESRCH; 781 goto fail; 782 } 783 if ((error = p_cansee(td, p)) != 0) 784 goto fail; 785 786 if ((error = p_candebug(td, p)) != 0) 787 goto fail; 788 789 /* 790 * System processes can't be debugged. 791 */ 792 if ((p->p_flag & P_SYSTEM) != 0) { 793 error = EINVAL; 794 goto fail; 795 } 796 797 if (tid == 0) { 798 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 799 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 800 td2 = p->p_xthread; 801 } else { 802 td2 = FIRST_THREAD_IN_PROC(p); 803 } 804 tid = td2->td_tid; 805 } 806 807 #ifdef COMPAT_FREEBSD32 808 /* 809 * Test if we're a 32 bit client and what the target is. 810 * Set the wrap controls accordingly. 811 */ 812 if (SV_CURPROC_FLAG(SV_ILP32)) { 813 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 814 safe = 1; 815 wrap32 = 1; 816 } 817 #endif 818 /* 819 * Permissions check 820 */ 821 switch (req) { 822 case PT_TRACE_ME: 823 /* 824 * Always legal, when there is a parent process which 825 * could trace us. Otherwise, reject. 826 */ 827 if ((p->p_flag & P_TRACED) != 0) { 828 error = EBUSY; 829 goto fail; 830 } 831 if (p->p_pptr == initproc) { 832 error = EPERM; 833 goto fail; 834 } 835 break; 836 837 case PT_ATTACH: 838 /* Self */ 839 if (p == td->td_proc) { 840 error = EINVAL; 841 goto fail; 842 } 843 844 /* Already traced */ 845 if (p->p_flag & P_TRACED) { 846 error = EBUSY; 847 goto fail; 848 } 849 850 /* Can't trace an ancestor if you're being traced. */ 851 if (curp->p_flag & P_TRACED) { 852 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 853 if (pp == p) { 854 error = EINVAL; 855 goto fail; 856 } 857 } 858 } 859 860 861 /* OK */ 862 break; 863 864 case PT_CLEARSTEP: 865 /* Allow thread to clear single step for itself */ 866 if (td->td_tid == tid) 867 break; 868 869 /* FALLTHROUGH */ 870 default: 871 /* not being traced... */ 872 if ((p->p_flag & P_TRACED) == 0) { 873 error = EPERM; 874 goto fail; 875 } 876 877 /* not being traced by YOU */ 878 if (p->p_pptr != td->td_proc) { 879 error = EBUSY; 880 goto fail; 881 } 882 883 /* not currently stopped */ 884 if ((p->p_flag & P_STOPPED_TRACE) == 0 || 885 p->p_suspcount != p->p_numthreads || 886 (p->p_flag & P_WAITED) == 0) { 887 error = EBUSY; 888 goto fail; 889 } 890 891 /* OK */ 892 break; 893 } 894 895 /* Keep this process around until we finish this request. */ 896 _PHOLD(p); 897 898 #ifdef FIX_SSTEP 899 /* 900 * Single step fixup ala procfs 901 */ 902 FIX_SSTEP(td2); 903 #endif 904 905 /* 906 * Actually do the requests 907 */ 908 909 td->td_retval[0] = 0; 910 911 switch (req) { 912 case PT_TRACE_ME: 913 /* set my trace flag and "owner" so it can read/write me */ 914 proc_set_traced(p, false); 915 if (p->p_flag & P_PPWAIT) 916 p->p_flag |= P_PPTRACE; 917 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 918 break; 919 920 case PT_ATTACH: 921 /* security check done above */ 922 /* 923 * It would be nice if the tracing relationship was separate 924 * from the parent relationship but that would require 925 * another set of links in the proc struct or for "wait" 926 * to scan the entire proc table. To make life easier, 927 * we just re-parent the process we're trying to trace. 928 * The old parent is remembered so we can put things back 929 * on a "detach". 930 */ 931 proc_set_traced(p, true); 932 proc_reparent(p, td->td_proc, false); 933 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 934 p->p_oppid); 935 936 sx_xunlock(&proctree_lock); 937 proctree_locked = 0; 938 MPASS(p->p_xthread == NULL); 939 MPASS((p->p_flag & P_STOPPED_TRACE) == 0); 940 941 /* 942 * If already stopped due to a stop signal, clear the 943 * existing stop before triggering a traced SIGSTOP. 944 */ 945 if ((p->p_flag & P_STOPPED_SIG) != 0) { 946 PROC_SLOCK(p); 947 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED); 948 thread_unsuspend(p); 949 PROC_SUNLOCK(p); 950 } 951 952 kern_psignal(p, SIGSTOP); 953 break; 954 955 case PT_CLEARSTEP: 956 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 957 p->p_pid); 958 error = ptrace_clear_single_step(td2); 959 break; 960 961 case PT_SETSTEP: 962 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 963 p->p_pid); 964 error = ptrace_single_step(td2); 965 break; 966 967 case PT_SUSPEND: 968 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 969 p->p_pid); 970 td2->td_dbgflags |= TDB_SUSPEND; 971 thread_lock(td2); 972 td2->td_flags |= TDF_NEEDSUSPCHK; 973 thread_unlock(td2); 974 break; 975 976 case PT_RESUME: 977 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 978 p->p_pid); 979 td2->td_dbgflags &= ~TDB_SUSPEND; 980 break; 981 982 case PT_FOLLOW_FORK: 983 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 984 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 985 data ? "enabled" : "disabled"); 986 if (data) 987 p->p_ptevents |= PTRACE_FORK; 988 else 989 p->p_ptevents &= ~PTRACE_FORK; 990 break; 991 992 case PT_LWP_EVENTS: 993 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 994 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 995 data ? "enabled" : "disabled"); 996 if (data) 997 p->p_ptevents |= PTRACE_LWP; 998 else 999 p->p_ptevents &= ~PTRACE_LWP; 1000 break; 1001 1002 case PT_GET_EVENT_MASK: 1003 if (data != sizeof(p->p_ptevents)) { 1004 error = EINVAL; 1005 break; 1006 } 1007 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 1008 p->p_ptevents); 1009 *(int *)addr = p->p_ptevents; 1010 break; 1011 1012 case PT_SET_EVENT_MASK: 1013 if (data != sizeof(p->p_ptevents)) { 1014 error = EINVAL; 1015 break; 1016 } 1017 tmp = *(int *)addr; 1018 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 1019 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 1020 error = EINVAL; 1021 break; 1022 } 1023 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1024 p->p_pid, p->p_ptevents, tmp); 1025 p->p_ptevents = tmp; 1026 break; 1027 1028 case PT_GET_SC_ARGS: 1029 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1030 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1031 #ifdef COMPAT_FREEBSD32 1032 || (wrap32 && !safe) 1033 #endif 1034 ) { 1035 error = EINVAL; 1036 break; 1037 } 1038 bzero(addr, sizeof(td2->td_sa.args)); 1039 #ifdef COMPAT_FREEBSD32 1040 if (wrap32) 1041 for (num = 0; num < nitems(td2->td_sa.args); num++) 1042 ((uint32_t *)addr)[num] = (uint32_t) 1043 td2->td_sa.args[num]; 1044 else 1045 #endif 1046 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1047 sizeof(register_t)); 1048 break; 1049 1050 case PT_STEP: 1051 case PT_CONTINUE: 1052 case PT_TO_SCE: 1053 case PT_TO_SCX: 1054 case PT_SYSCALL: 1055 case PT_DETACH: 1056 /* Zero means do not send any signal */ 1057 if (data < 0 || data > _SIG_MAXSIG) { 1058 error = EINVAL; 1059 break; 1060 } 1061 1062 switch (req) { 1063 case PT_STEP: 1064 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1065 td2->td_tid, p->p_pid, data); 1066 error = ptrace_single_step(td2); 1067 if (error) 1068 goto out; 1069 break; 1070 case PT_CONTINUE: 1071 case PT_TO_SCE: 1072 case PT_TO_SCX: 1073 case PT_SYSCALL: 1074 if (addr != (void *)1) { 1075 error = ptrace_set_pc(td2, 1076 (u_long)(uintfptr_t)addr); 1077 if (error) 1078 goto out; 1079 } 1080 switch (req) { 1081 case PT_TO_SCE: 1082 p->p_ptevents |= PTRACE_SCE; 1083 CTR4(KTR_PTRACE, 1084 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1085 p->p_pid, p->p_ptevents, 1086 (u_long)(uintfptr_t)addr, data); 1087 break; 1088 case PT_TO_SCX: 1089 p->p_ptevents |= PTRACE_SCX; 1090 CTR4(KTR_PTRACE, 1091 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1092 p->p_pid, p->p_ptevents, 1093 (u_long)(uintfptr_t)addr, data); 1094 break; 1095 case PT_SYSCALL: 1096 p->p_ptevents |= PTRACE_SYSCALL; 1097 CTR4(KTR_PTRACE, 1098 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1099 p->p_pid, p->p_ptevents, 1100 (u_long)(uintfptr_t)addr, data); 1101 break; 1102 case PT_CONTINUE: 1103 CTR3(KTR_PTRACE, 1104 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1105 p->p_pid, (u_long)(uintfptr_t)addr, data); 1106 break; 1107 } 1108 break; 1109 case PT_DETACH: 1110 /* 1111 * Reset the process parent. 1112 * 1113 * NB: This clears P_TRACED before reparenting 1114 * a detached process back to its original 1115 * parent. Otherwise the debugee will be set 1116 * as an orphan of the debugger. 1117 */ 1118 p->p_flag &= ~(P_TRACED | P_WAITED); 1119 if (p->p_oppid != p->p_pptr->p_pid) { 1120 PROC_LOCK(p->p_pptr); 1121 sigqueue_take(p->p_ksi); 1122 PROC_UNLOCK(p->p_pptr); 1123 1124 pp = proc_realparent(p); 1125 proc_reparent(p, pp, false); 1126 if (pp == initproc) 1127 p->p_sigparent = SIGCHLD; 1128 CTR3(KTR_PTRACE, 1129 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1130 p->p_pid, pp->p_pid, data); 1131 } else 1132 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1133 p->p_pid, data); 1134 p->p_ptevents = 0; 1135 FOREACH_THREAD_IN_PROC(p, td3) { 1136 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1137 sigqueue_delete(&td3->td_sigqueue, 1138 SIGSTOP); 1139 } 1140 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP | 1141 TDB_SUSPEND); 1142 } 1143 1144 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1145 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1146 p->p_flag2 &= ~P2_PTRACE_FSTP; 1147 } 1148 1149 /* should we send SIGCHLD? */ 1150 /* childproc_continued(p); */ 1151 break; 1152 } 1153 1154 sx_xunlock(&proctree_lock); 1155 proctree_locked = 0; 1156 1157 sendsig: 1158 MPASS(proctree_locked == 0); 1159 1160 /* 1161 * Clear the pending event for the thread that just 1162 * reported its event (p_xthread). This may not be 1163 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1164 * the debugger is resuming a different thread. 1165 * 1166 * Deliver any pending signal via the reporting thread. 1167 */ 1168 MPASS(p->p_xthread != NULL); 1169 p->p_xthread->td_dbgflags &= ~TDB_XSIG; 1170 p->p_xthread->td_xsig = data; 1171 p->p_xthread = NULL; 1172 p->p_xsig = data; 1173 1174 /* 1175 * P_WKILLED is insurance that a PT_KILL/SIGKILL 1176 * always works immediately, even if another thread is 1177 * unsuspended first and attempts to handle a 1178 * different signal or if the POSIX.1b style signal 1179 * queue cannot accommodate any new signals. 1180 */ 1181 if (data == SIGKILL) 1182 proc_wkilled(p); 1183 1184 /* 1185 * Unsuspend all threads. To leave a thread 1186 * suspended, use PT_SUSPEND to suspend it before 1187 * continuing the process. 1188 */ 1189 PROC_SLOCK(p); 1190 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED); 1191 thread_unsuspend(p); 1192 PROC_SUNLOCK(p); 1193 break; 1194 1195 case PT_WRITE_I: 1196 case PT_WRITE_D: 1197 td2->td_dbgflags |= TDB_USERWR; 1198 PROC_UNLOCK(p); 1199 error = 0; 1200 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1201 sizeof(int)) != sizeof(int)) 1202 error = ENOMEM; 1203 else 1204 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1205 p->p_pid, addr, data); 1206 PROC_LOCK(p); 1207 break; 1208 1209 case PT_READ_I: 1210 case PT_READ_D: 1211 PROC_UNLOCK(p); 1212 error = tmp = 0; 1213 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1214 sizeof(int)) != sizeof(int)) 1215 error = ENOMEM; 1216 else 1217 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1218 p->p_pid, addr, tmp); 1219 td->td_retval[0] = tmp; 1220 PROC_LOCK(p); 1221 break; 1222 1223 case PT_IO: 1224 #ifdef COMPAT_FREEBSD32 1225 if (wrap32) { 1226 piod32 = addr; 1227 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1228 iov.iov_len = piod32->piod_len; 1229 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1230 uio.uio_resid = piod32->piod_len; 1231 } else 1232 #endif 1233 { 1234 piod = addr; 1235 iov.iov_base = piod->piod_addr; 1236 iov.iov_len = piod->piod_len; 1237 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1238 uio.uio_resid = piod->piod_len; 1239 } 1240 uio.uio_iov = &iov; 1241 uio.uio_iovcnt = 1; 1242 uio.uio_segflg = UIO_USERSPACE; 1243 uio.uio_td = td; 1244 #ifdef COMPAT_FREEBSD32 1245 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1246 #else 1247 tmp = piod->piod_op; 1248 #endif 1249 switch (tmp) { 1250 case PIOD_READ_D: 1251 case PIOD_READ_I: 1252 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1253 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1254 uio.uio_rw = UIO_READ; 1255 break; 1256 case PIOD_WRITE_D: 1257 case PIOD_WRITE_I: 1258 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1259 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1260 td2->td_dbgflags |= TDB_USERWR; 1261 uio.uio_rw = UIO_WRITE; 1262 break; 1263 default: 1264 error = EINVAL; 1265 goto out; 1266 } 1267 PROC_UNLOCK(p); 1268 error = proc_rwmem(p, &uio); 1269 #ifdef COMPAT_FREEBSD32 1270 if (wrap32) 1271 piod32->piod_len -= uio.uio_resid; 1272 else 1273 #endif 1274 piod->piod_len -= uio.uio_resid; 1275 PROC_LOCK(p); 1276 break; 1277 1278 case PT_KILL: 1279 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1280 data = SIGKILL; 1281 goto sendsig; /* in PT_CONTINUE above */ 1282 1283 case PT_SETREGS: 1284 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1285 p->p_pid); 1286 td2->td_dbgflags |= TDB_USERWR; 1287 error = PROC_WRITE(regs, td2, addr); 1288 break; 1289 1290 case PT_GETREGS: 1291 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1292 p->p_pid); 1293 error = PROC_READ(regs, td2, addr); 1294 break; 1295 1296 case PT_SETFPREGS: 1297 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1298 p->p_pid); 1299 td2->td_dbgflags |= TDB_USERWR; 1300 error = PROC_WRITE(fpregs, td2, addr); 1301 break; 1302 1303 case PT_GETFPREGS: 1304 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1305 p->p_pid); 1306 error = PROC_READ(fpregs, td2, addr); 1307 break; 1308 1309 case PT_SETDBREGS: 1310 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1311 p->p_pid); 1312 td2->td_dbgflags |= TDB_USERWR; 1313 error = PROC_WRITE(dbregs, td2, addr); 1314 break; 1315 1316 case PT_GETDBREGS: 1317 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1318 p->p_pid); 1319 error = PROC_READ(dbregs, td2, addr); 1320 break; 1321 1322 case PT_LWPINFO: 1323 if (data <= 0 || 1324 #ifdef COMPAT_FREEBSD32 1325 (!wrap32 && data > sizeof(*pl)) || 1326 (wrap32 && data > sizeof(*pl32))) { 1327 #else 1328 data > sizeof(*pl)) { 1329 #endif 1330 error = EINVAL; 1331 break; 1332 } 1333 #ifdef COMPAT_FREEBSD32 1334 if (wrap32) { 1335 pl = &plr; 1336 pl32 = addr; 1337 } else 1338 #endif 1339 pl = addr; 1340 bzero(pl, sizeof(*pl)); 1341 pl->pl_lwpid = td2->td_tid; 1342 pl->pl_event = PL_EVENT_NONE; 1343 pl->pl_flags = 0; 1344 if (td2->td_dbgflags & TDB_XSIG) { 1345 pl->pl_event = PL_EVENT_SIGNAL; 1346 if (td2->td_si.si_signo != 0 && 1347 #ifdef COMPAT_FREEBSD32 1348 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1349 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1350 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1351 pl_siginfo) + sizeof(struct siginfo32))) 1352 #else 1353 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1354 + sizeof(pl->pl_siginfo) 1355 #endif 1356 ){ 1357 pl->pl_flags |= PL_FLAG_SI; 1358 pl->pl_siginfo = td2->td_si; 1359 } 1360 } 1361 if (td2->td_dbgflags & TDB_SCE) 1362 pl->pl_flags |= PL_FLAG_SCE; 1363 else if (td2->td_dbgflags & TDB_SCX) 1364 pl->pl_flags |= PL_FLAG_SCX; 1365 if (td2->td_dbgflags & TDB_EXEC) 1366 pl->pl_flags |= PL_FLAG_EXEC; 1367 if (td2->td_dbgflags & TDB_FORK) { 1368 pl->pl_flags |= PL_FLAG_FORKED; 1369 pl->pl_child_pid = td2->td_dbg_forked; 1370 if (td2->td_dbgflags & TDB_VFORK) 1371 pl->pl_flags |= PL_FLAG_VFORKED; 1372 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1373 TDB_VFORK) 1374 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1375 if (td2->td_dbgflags & TDB_CHILD) 1376 pl->pl_flags |= PL_FLAG_CHILD; 1377 if (td2->td_dbgflags & TDB_BORN) 1378 pl->pl_flags |= PL_FLAG_BORN; 1379 if (td2->td_dbgflags & TDB_EXIT) 1380 pl->pl_flags |= PL_FLAG_EXITED; 1381 pl->pl_sigmask = td2->td_sigmask; 1382 pl->pl_siglist = td2->td_siglist; 1383 strcpy(pl->pl_tdname, td2->td_name); 1384 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1385 pl->pl_syscall_code = td2->td_sa.code; 1386 pl->pl_syscall_narg = td2->td_sa.narg; 1387 } else { 1388 pl->pl_syscall_code = 0; 1389 pl->pl_syscall_narg = 0; 1390 } 1391 #ifdef COMPAT_FREEBSD32 1392 if (wrap32) 1393 ptrace_lwpinfo_to32(pl, pl32); 1394 #endif 1395 CTR6(KTR_PTRACE, 1396 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1397 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1398 pl->pl_child_pid, pl->pl_syscall_code); 1399 break; 1400 1401 case PT_GETNUMLWPS: 1402 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1403 p->p_numthreads); 1404 td->td_retval[0] = p->p_numthreads; 1405 break; 1406 1407 case PT_GETLWPLIST: 1408 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1409 p->p_pid, data, p->p_numthreads); 1410 if (data <= 0) { 1411 error = EINVAL; 1412 break; 1413 } 1414 num = imin(p->p_numthreads, data); 1415 PROC_UNLOCK(p); 1416 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1417 tmp = 0; 1418 PROC_LOCK(p); 1419 FOREACH_THREAD_IN_PROC(p, td2) { 1420 if (tmp >= num) 1421 break; 1422 buf[tmp++] = td2->td_tid; 1423 } 1424 PROC_UNLOCK(p); 1425 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1426 free(buf, M_TEMP); 1427 if (!error) 1428 td->td_retval[0] = tmp; 1429 PROC_LOCK(p); 1430 break; 1431 1432 case PT_VM_TIMESTAMP: 1433 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1434 p->p_pid, p->p_vmspace->vm_map.timestamp); 1435 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1436 break; 1437 1438 case PT_VM_ENTRY: 1439 PROC_UNLOCK(p); 1440 #ifdef COMPAT_FREEBSD32 1441 if (wrap32) 1442 error = ptrace_vm_entry32(td, p, addr); 1443 else 1444 #endif 1445 error = ptrace_vm_entry(td, p, addr); 1446 PROC_LOCK(p); 1447 break; 1448 1449 default: 1450 #ifdef __HAVE_PTRACE_MACHDEP 1451 if (req >= PT_FIRSTMACH) { 1452 PROC_UNLOCK(p); 1453 error = cpu_ptrace(td2, req, addr, data); 1454 PROC_LOCK(p); 1455 } else 1456 #endif 1457 /* Unknown request. */ 1458 error = EINVAL; 1459 break; 1460 } 1461 1462 out: 1463 /* Drop our hold on this process now that the request has completed. */ 1464 _PRELE(p); 1465 fail: 1466 PROC_UNLOCK(p); 1467 if (proctree_locked) 1468 sx_xunlock(&proctree_lock); 1469 return (error); 1470 } 1471 #undef PROC_READ 1472 #undef PROC_WRITE 1473 1474 /* 1475 * Stop a process because of a debugging event; 1476 * stay stopped until p->p_step is cleared 1477 * (cleared by PIOCCONT in procfs). 1478 */ 1479 void 1480 stopevent(struct proc *p, unsigned int event, unsigned int val) 1481 { 1482 1483 PROC_LOCK_ASSERT(p, MA_OWNED); 1484 p->p_step = 1; 1485 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1486 val); 1487 do { 1488 if (event != S_EXIT) 1489 p->p_xsig = val; 1490 p->p_xthread = NULL; 1491 p->p_stype = event; /* Which event caused the stop? */ 1492 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1493 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1494 } while (p->p_step); 1495 } 1496