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/ktr.h> 40 #include <sys/limits.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_sc_ret32 { 81 uint32_t sr_retval[2]; 82 int sr_error; 83 }; 84 85 struct ptrace_vm_entry32 { 86 int pve_entry; 87 int pve_timestamp; 88 uint32_t pve_start; 89 uint32_t pve_end; 90 uint32_t pve_offset; 91 u_int pve_prot; 92 u_int pve_pathlen; 93 int32_t pve_fileid; 94 u_int pve_fsid; 95 uint32_t pve_path; 96 }; 97 #endif 98 99 /* 100 * Functions implemented using PROC_ACTION(): 101 * 102 * proc_read_regs(proc, regs) 103 * Get the current user-visible register set from the process 104 * and copy it into the regs structure (<machine/reg.h>). 105 * The process is stopped at the time read_regs is called. 106 * 107 * proc_write_regs(proc, regs) 108 * Update the current register set from the passed in regs 109 * structure. Take care to avoid clobbering special CPU 110 * registers or privileged bits in the PSL. 111 * Depending on the architecture this may have fix-up work to do, 112 * especially if the IAR or PCW are modified. 113 * The process is stopped at the time write_regs is called. 114 * 115 * proc_read_fpregs, proc_write_fpregs 116 * deal with the floating point register set, otherwise as above. 117 * 118 * proc_read_dbregs, proc_write_dbregs 119 * deal with the processor debug register set, otherwise as above. 120 * 121 * proc_sstep(proc) 122 * Arrange for the process to trap after executing a single instruction. 123 */ 124 125 #define PROC_ACTION(action) do { \ 126 int error; \ 127 \ 128 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 129 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 130 error = EIO; \ 131 else \ 132 error = (action); \ 133 return (error); \ 134 } while(0) 135 136 int 137 proc_read_regs(struct thread *td, struct reg *regs) 138 { 139 140 PROC_ACTION(fill_regs(td, regs)); 141 } 142 143 int 144 proc_write_regs(struct thread *td, struct reg *regs) 145 { 146 147 PROC_ACTION(set_regs(td, regs)); 148 } 149 150 int 151 proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 152 { 153 154 PROC_ACTION(fill_dbregs(td, dbregs)); 155 } 156 157 int 158 proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 159 { 160 161 PROC_ACTION(set_dbregs(td, dbregs)); 162 } 163 164 /* 165 * Ptrace doesn't support fpregs at all, and there are no security holes 166 * or translations for fpregs, so we can just copy them. 167 */ 168 int 169 proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 170 { 171 172 PROC_ACTION(fill_fpregs(td, fpregs)); 173 } 174 175 int 176 proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 177 { 178 179 PROC_ACTION(set_fpregs(td, fpregs)); 180 } 181 182 #ifdef COMPAT_FREEBSD32 183 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 184 int 185 proc_read_regs32(struct thread *td, struct reg32 *regs32) 186 { 187 188 PROC_ACTION(fill_regs32(td, regs32)); 189 } 190 191 int 192 proc_write_regs32(struct thread *td, struct reg32 *regs32) 193 { 194 195 PROC_ACTION(set_regs32(td, regs32)); 196 } 197 198 int 199 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 200 { 201 202 PROC_ACTION(fill_dbregs32(td, dbregs32)); 203 } 204 205 int 206 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 207 { 208 209 PROC_ACTION(set_dbregs32(td, dbregs32)); 210 } 211 212 int 213 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 214 { 215 216 PROC_ACTION(fill_fpregs32(td, fpregs32)); 217 } 218 219 int 220 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 221 { 222 223 PROC_ACTION(set_fpregs32(td, fpregs32)); 224 } 225 #endif 226 227 int 228 proc_sstep(struct thread *td) 229 { 230 231 PROC_ACTION(ptrace_single_step(td)); 232 } 233 234 int 235 proc_rwmem(struct proc *p, struct uio *uio) 236 { 237 vm_map_t map; 238 vm_offset_t pageno; /* page number */ 239 vm_prot_t reqprot; 240 int error, fault_flags, page_offset, writing; 241 242 /* 243 * Assert that someone has locked this vmspace. (Should be 244 * curthread but we can't assert that.) This keeps the process 245 * from exiting out from under us until this operation completes. 246 */ 247 PROC_ASSERT_HELD(p); 248 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 249 250 /* 251 * The map we want... 252 */ 253 map = &p->p_vmspace->vm_map; 254 255 /* 256 * If we are writing, then we request vm_fault() to create a private 257 * copy of each page. Since these copies will not be writeable by the 258 * process, we must explicity request that they be dirtied. 259 */ 260 writing = uio->uio_rw == UIO_WRITE; 261 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 262 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 263 264 /* 265 * Only map in one page at a time. We don't have to, but it 266 * makes things easier. This way is trivial - right? 267 */ 268 do { 269 vm_offset_t uva; 270 u_int len; 271 vm_page_t m; 272 273 uva = (vm_offset_t)uio->uio_offset; 274 275 /* 276 * Get the page number of this segment. 277 */ 278 pageno = trunc_page(uva); 279 page_offset = uva - pageno; 280 281 /* 282 * How many bytes to copy 283 */ 284 len = min(PAGE_SIZE - page_offset, uio->uio_resid); 285 286 /* 287 * Fault and hold the page on behalf of the process. 288 */ 289 error = vm_fault(map, pageno, reqprot, fault_flags, &m); 290 if (error != KERN_SUCCESS) { 291 if (error == KERN_RESOURCE_SHORTAGE) 292 error = ENOMEM; 293 else 294 error = EFAULT; 295 break; 296 } 297 298 /* 299 * Now do the i/o move. 300 */ 301 error = uiomove_fromphys(&m, page_offset, len, uio); 302 303 /* Make the I-cache coherent for breakpoints. */ 304 if (writing && error == 0) { 305 vm_map_lock_read(map); 306 if (vm_map_check_protection(map, pageno, pageno + 307 PAGE_SIZE, VM_PROT_EXECUTE)) 308 vm_sync_icache(map, uva, len); 309 vm_map_unlock_read(map); 310 } 311 312 /* 313 * Release the page. 314 */ 315 vm_page_unwire(m, PQ_ACTIVE); 316 317 } while (error == 0 && uio->uio_resid > 0); 318 319 return (error); 320 } 321 322 static ssize_t 323 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 324 size_t len, enum uio_rw rw) 325 { 326 struct iovec iov; 327 struct uio uio; 328 ssize_t slen; 329 330 MPASS(len < SSIZE_MAX); 331 slen = (ssize_t)len; 332 333 iov.iov_base = (caddr_t)buf; 334 iov.iov_len = len; 335 uio.uio_iov = &iov; 336 uio.uio_iovcnt = 1; 337 uio.uio_offset = va; 338 uio.uio_resid = slen; 339 uio.uio_segflg = UIO_SYSSPACE; 340 uio.uio_rw = rw; 341 uio.uio_td = td; 342 proc_rwmem(p, &uio); 343 if (uio.uio_resid == slen) 344 return (-1); 345 return (slen - uio.uio_resid); 346 } 347 348 ssize_t 349 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 350 size_t len) 351 { 352 353 return (proc_iop(td, p, va, buf, len, UIO_READ)); 354 } 355 356 ssize_t 357 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 358 size_t len) 359 { 360 361 return (proc_iop(td, p, va, buf, len, UIO_WRITE)); 362 } 363 364 static int 365 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 366 { 367 struct vattr vattr; 368 vm_map_t map; 369 vm_map_entry_t entry; 370 vm_object_t obj, tobj, lobj; 371 struct vmspace *vm; 372 struct vnode *vp; 373 char *freepath, *fullpath; 374 u_int pathlen; 375 int error, index; 376 377 error = 0; 378 obj = NULL; 379 380 vm = vmspace_acquire_ref(p); 381 map = &vm->vm_map; 382 vm_map_lock_read(map); 383 384 do { 385 entry = map->header.next; 386 index = 0; 387 while (index < pve->pve_entry && entry != &map->header) { 388 entry = entry->next; 389 index++; 390 } 391 if (index != pve->pve_entry) { 392 error = EINVAL; 393 break; 394 } 395 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0, 396 ("Submap in map header")); 397 while ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 398 entry = entry->next; 399 index++; 400 } 401 if (entry == &map->header) { 402 error = ENOENT; 403 break; 404 } 405 406 /* We got an entry. */ 407 pve->pve_entry = index + 1; 408 pve->pve_timestamp = map->timestamp; 409 pve->pve_start = entry->start; 410 pve->pve_end = entry->end - 1; 411 pve->pve_offset = entry->offset; 412 pve->pve_prot = entry->protection; 413 414 /* Backing object's path needed? */ 415 if (pve->pve_pathlen == 0) 416 break; 417 418 pathlen = pve->pve_pathlen; 419 pve->pve_pathlen = 0; 420 421 obj = entry->object.vm_object; 422 if (obj != NULL) 423 VM_OBJECT_RLOCK(obj); 424 } while (0); 425 426 vm_map_unlock_read(map); 427 428 pve->pve_fsid = VNOVAL; 429 pve->pve_fileid = VNOVAL; 430 431 if (error == 0 && obj != NULL) { 432 lobj = obj; 433 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 434 if (tobj != obj) 435 VM_OBJECT_RLOCK(tobj); 436 if (lobj != obj) 437 VM_OBJECT_RUNLOCK(lobj); 438 lobj = tobj; 439 pve->pve_offset += tobj->backing_object_offset; 440 } 441 vp = vm_object_vnode(lobj); 442 if (vp != NULL) 443 vref(vp); 444 if (lobj != obj) 445 VM_OBJECT_RUNLOCK(lobj); 446 VM_OBJECT_RUNLOCK(obj); 447 448 if (vp != NULL) { 449 freepath = NULL; 450 fullpath = NULL; 451 vn_fullpath(td, vp, &fullpath, &freepath); 452 vn_lock(vp, LK_SHARED | LK_RETRY); 453 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 454 pve->pve_fileid = vattr.va_fileid; 455 pve->pve_fsid = vattr.va_fsid; 456 } 457 vput(vp); 458 459 if (fullpath != NULL) { 460 pve->pve_pathlen = strlen(fullpath) + 1; 461 if (pve->pve_pathlen <= pathlen) { 462 error = copyout(fullpath, pve->pve_path, 463 pve->pve_pathlen); 464 } else 465 error = ENAMETOOLONG; 466 } 467 if (freepath != NULL) 468 free(freepath, M_TEMP); 469 } 470 } 471 vmspace_free(vm); 472 if (error == 0) 473 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 474 p->p_pid, pve->pve_entry, pve->pve_start); 475 476 return (error); 477 } 478 479 #ifdef COMPAT_FREEBSD32 480 static int 481 ptrace_vm_entry32(struct thread *td, struct proc *p, 482 struct ptrace_vm_entry32 *pve32) 483 { 484 struct ptrace_vm_entry pve; 485 int error; 486 487 pve.pve_entry = pve32->pve_entry; 488 pve.pve_pathlen = pve32->pve_pathlen; 489 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 490 491 error = ptrace_vm_entry(td, p, &pve); 492 if (error == 0) { 493 pve32->pve_entry = pve.pve_entry; 494 pve32->pve_timestamp = pve.pve_timestamp; 495 pve32->pve_start = pve.pve_start; 496 pve32->pve_end = pve.pve_end; 497 pve32->pve_offset = pve.pve_offset; 498 pve32->pve_prot = pve.pve_prot; 499 pve32->pve_fileid = pve.pve_fileid; 500 pve32->pve_fsid = pve.pve_fsid; 501 } 502 503 pve32->pve_pathlen = pve.pve_pathlen; 504 return (error); 505 } 506 507 static void 508 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 509 struct ptrace_lwpinfo32 *pl32) 510 { 511 512 bzero(pl32, sizeof(*pl32)); 513 pl32->pl_lwpid = pl->pl_lwpid; 514 pl32->pl_event = pl->pl_event; 515 pl32->pl_flags = pl->pl_flags; 516 pl32->pl_sigmask = pl->pl_sigmask; 517 pl32->pl_siglist = pl->pl_siglist; 518 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 519 strcpy(pl32->pl_tdname, pl->pl_tdname); 520 pl32->pl_child_pid = pl->pl_child_pid; 521 pl32->pl_syscall_code = pl->pl_syscall_code; 522 pl32->pl_syscall_narg = pl->pl_syscall_narg; 523 } 524 525 static void 526 ptrace_sc_ret_to32(const struct ptrace_sc_ret *psr, 527 struct ptrace_sc_ret32 *psr32) 528 { 529 530 bzero(psr32, sizeof(*psr32)); 531 psr32->sr_retval[0] = psr->sr_retval[0]; 532 psr32->sr_retval[1] = psr->sr_retval[1]; 533 psr32->sr_error = psr->sr_error; 534 } 535 #endif /* COMPAT_FREEBSD32 */ 536 537 /* 538 * Process debugging system call. 539 */ 540 #ifndef _SYS_SYSPROTO_H_ 541 struct ptrace_args { 542 int req; 543 pid_t pid; 544 caddr_t addr; 545 int data; 546 }; 547 #endif 548 549 #ifdef COMPAT_FREEBSD32 550 /* 551 * This CPP subterfuge is to try and reduce the number of ifdefs in 552 * the body of the code. 553 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 554 * becomes either: 555 * copyin(uap->addr, &r.reg, sizeof r.reg); 556 * or 557 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 558 * .. except this is done at runtime. 559 */ 560 #define BZERO(a, s) wrap32 ? \ 561 bzero(a ## 32, s ## 32) : \ 562 bzero(a, s) 563 #define COPYIN(u, k, s) wrap32 ? \ 564 copyin(u, k ## 32, s ## 32) : \ 565 copyin(u, k, s) 566 #define COPYOUT(k, u, s) wrap32 ? \ 567 copyout(k ## 32, u, s ## 32) : \ 568 copyout(k, u, s) 569 #else 570 #define BZERO(a, s) bzero(a, s) 571 #define COPYIN(u, k, s) copyin(u, k, s) 572 #define COPYOUT(k, u, s) copyout(k, u, s) 573 #endif 574 int 575 sys_ptrace(struct thread *td, struct ptrace_args *uap) 576 { 577 /* 578 * XXX this obfuscation is to reduce stack usage, but the register 579 * structs may be too large to put on the stack anyway. 580 */ 581 union { 582 struct ptrace_io_desc piod; 583 struct ptrace_lwpinfo pl; 584 struct ptrace_vm_entry pve; 585 struct dbreg dbreg; 586 struct fpreg fpreg; 587 struct reg reg; 588 #ifdef COMPAT_FREEBSD32 589 struct dbreg32 dbreg32; 590 struct fpreg32 fpreg32; 591 struct reg32 reg32; 592 struct ptrace_io_desc32 piod32; 593 struct ptrace_lwpinfo32 pl32; 594 struct ptrace_vm_entry32 pve32; 595 #endif 596 char args[sizeof(td->td_sa.args)]; 597 struct ptrace_sc_ret psr; 598 int ptevents; 599 } r; 600 void *addr; 601 int error = 0; 602 #ifdef COMPAT_FREEBSD32 603 int wrap32 = 0; 604 605 if (SV_CURPROC_FLAG(SV_ILP32)) 606 wrap32 = 1; 607 #endif 608 AUDIT_ARG_PID(uap->pid); 609 AUDIT_ARG_CMD(uap->req); 610 AUDIT_ARG_VALUE(uap->data); 611 addr = &r; 612 switch (uap->req) { 613 case PT_GET_EVENT_MASK: 614 case PT_LWPINFO: 615 case PT_GET_SC_ARGS: 616 case PT_GET_SC_RET: 617 break; 618 case PT_GETREGS: 619 BZERO(&r.reg, sizeof r.reg); 620 break; 621 case PT_GETFPREGS: 622 BZERO(&r.fpreg, sizeof r.fpreg); 623 break; 624 case PT_GETDBREGS: 625 BZERO(&r.dbreg, sizeof r.dbreg); 626 break; 627 case PT_SETREGS: 628 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 629 break; 630 case PT_SETFPREGS: 631 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 632 break; 633 case PT_SETDBREGS: 634 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 635 break; 636 case PT_SET_EVENT_MASK: 637 if (uap->data != sizeof(r.ptevents)) 638 error = EINVAL; 639 else 640 error = copyin(uap->addr, &r.ptevents, uap->data); 641 break; 642 case PT_IO: 643 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 644 break; 645 case PT_VM_ENTRY: 646 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 647 break; 648 default: 649 addr = uap->addr; 650 break; 651 } 652 if (error) 653 return (error); 654 655 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 656 if (error) 657 return (error); 658 659 switch (uap->req) { 660 case PT_VM_ENTRY: 661 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 662 break; 663 case PT_IO: 664 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 665 break; 666 case PT_GETREGS: 667 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 668 break; 669 case PT_GETFPREGS: 670 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 671 break; 672 case PT_GETDBREGS: 673 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 674 break; 675 case PT_GET_EVENT_MASK: 676 /* NB: The size in uap->data is validated in kern_ptrace(). */ 677 error = copyout(&r.ptevents, uap->addr, uap->data); 678 break; 679 case PT_LWPINFO: 680 /* NB: The size in uap->data is validated in kern_ptrace(). */ 681 error = copyout(&r.pl, uap->addr, uap->data); 682 break; 683 case PT_GET_SC_ARGS: 684 error = copyout(r.args, uap->addr, MIN(uap->data, 685 sizeof(r.args))); 686 break; 687 case PT_GET_SC_RET: 688 error = copyout(&r.psr, uap->addr, MIN(uap->data, 689 sizeof(r.psr))); 690 break; 691 } 692 693 return (error); 694 } 695 #undef COPYIN 696 #undef COPYOUT 697 #undef BZERO 698 699 #ifdef COMPAT_FREEBSD32 700 /* 701 * PROC_READ(regs, td2, addr); 702 * becomes either: 703 * proc_read_regs(td2, addr); 704 * or 705 * proc_read_regs32(td2, addr); 706 * .. except this is done at runtime. There is an additional 707 * complication in that PROC_WRITE disallows 32 bit consumers 708 * from writing to 64 bit address space targets. 709 */ 710 #define PROC_READ(w, t, a) wrap32 ? \ 711 proc_read_ ## w ## 32(t, a) : \ 712 proc_read_ ## w (t, a) 713 #define PROC_WRITE(w, t, a) wrap32 ? \ 714 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 715 proc_write_ ## w (t, a) 716 #else 717 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 718 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 719 #endif 720 721 void 722 proc_set_traced(struct proc *p, bool stop) 723 { 724 725 sx_assert(&proctree_lock, SX_XLOCKED); 726 PROC_LOCK_ASSERT(p, MA_OWNED); 727 p->p_flag |= P_TRACED; 728 if (stop) 729 p->p_flag2 |= P2_PTRACE_FSTP; 730 p->p_ptevents = PTRACE_DEFAULT; 731 } 732 733 int 734 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 735 { 736 struct iovec iov; 737 struct uio uio; 738 struct proc *curp, *p, *pp; 739 struct thread *td2 = NULL, *td3; 740 struct ptrace_io_desc *piod = NULL; 741 struct ptrace_lwpinfo *pl; 742 struct ptrace_sc_ret *psr; 743 int error, num, tmp; 744 int proctree_locked = 0; 745 lwpid_t tid = 0, *buf; 746 #ifdef COMPAT_FREEBSD32 747 int wrap32 = 0, safe = 0; 748 struct ptrace_io_desc32 *piod32 = NULL; 749 struct ptrace_lwpinfo32 *pl32 = NULL; 750 struct ptrace_sc_ret32 *psr32 = NULL; 751 union { 752 struct ptrace_lwpinfo pl; 753 struct ptrace_sc_ret psr; 754 } r; 755 #endif 756 757 curp = td->td_proc; 758 759 /* Lock proctree before locking the process. */ 760 switch (req) { 761 case PT_TRACE_ME: 762 case PT_ATTACH: 763 case PT_STEP: 764 case PT_CONTINUE: 765 case PT_TO_SCE: 766 case PT_TO_SCX: 767 case PT_SYSCALL: 768 case PT_FOLLOW_FORK: 769 case PT_LWP_EVENTS: 770 case PT_GET_EVENT_MASK: 771 case PT_SET_EVENT_MASK: 772 case PT_DETACH: 773 case PT_GET_SC_ARGS: 774 sx_xlock(&proctree_lock); 775 proctree_locked = 1; 776 break; 777 default: 778 break; 779 } 780 781 if (req == PT_TRACE_ME) { 782 p = td->td_proc; 783 PROC_LOCK(p); 784 } else { 785 if (pid <= PID_MAX) { 786 if ((p = pfind(pid)) == NULL) { 787 if (proctree_locked) 788 sx_xunlock(&proctree_lock); 789 return (ESRCH); 790 } 791 } else { 792 td2 = tdfind(pid, -1); 793 if (td2 == NULL) { 794 if (proctree_locked) 795 sx_xunlock(&proctree_lock); 796 return (ESRCH); 797 } 798 p = td2->td_proc; 799 tid = pid; 800 pid = p->p_pid; 801 } 802 } 803 AUDIT_ARG_PROCESS(p); 804 805 if ((p->p_flag & P_WEXIT) != 0) { 806 error = ESRCH; 807 goto fail; 808 } 809 if ((error = p_cansee(td, p)) != 0) 810 goto fail; 811 812 if ((error = p_candebug(td, p)) != 0) 813 goto fail; 814 815 /* 816 * System processes can't be debugged. 817 */ 818 if ((p->p_flag & P_SYSTEM) != 0) { 819 error = EINVAL; 820 goto fail; 821 } 822 823 if (tid == 0) { 824 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 825 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 826 td2 = p->p_xthread; 827 } else { 828 td2 = FIRST_THREAD_IN_PROC(p); 829 } 830 tid = td2->td_tid; 831 } 832 833 #ifdef COMPAT_FREEBSD32 834 /* 835 * Test if we're a 32 bit client and what the target is. 836 * Set the wrap controls accordingly. 837 */ 838 if (SV_CURPROC_FLAG(SV_ILP32)) { 839 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 840 safe = 1; 841 wrap32 = 1; 842 } 843 #endif 844 /* 845 * Permissions check 846 */ 847 switch (req) { 848 case PT_TRACE_ME: 849 /* 850 * Always legal, when there is a parent process which 851 * could trace us. Otherwise, reject. 852 */ 853 if ((p->p_flag & P_TRACED) != 0) { 854 error = EBUSY; 855 goto fail; 856 } 857 if (p->p_pptr == initproc) { 858 error = EPERM; 859 goto fail; 860 } 861 break; 862 863 case PT_ATTACH: 864 /* Self */ 865 if (p == td->td_proc) { 866 error = EINVAL; 867 goto fail; 868 } 869 870 /* Already traced */ 871 if (p->p_flag & P_TRACED) { 872 error = EBUSY; 873 goto fail; 874 } 875 876 /* Can't trace an ancestor if you're being traced. */ 877 if (curp->p_flag & P_TRACED) { 878 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 879 if (pp == p) { 880 error = EINVAL; 881 goto fail; 882 } 883 } 884 } 885 886 887 /* OK */ 888 break; 889 890 case PT_CLEARSTEP: 891 /* Allow thread to clear single step for itself */ 892 if (td->td_tid == tid) 893 break; 894 895 /* FALLTHROUGH */ 896 default: 897 /* not being traced... */ 898 if ((p->p_flag & P_TRACED) == 0) { 899 error = EPERM; 900 goto fail; 901 } 902 903 /* not being traced by YOU */ 904 if (p->p_pptr != td->td_proc) { 905 error = EBUSY; 906 goto fail; 907 } 908 909 /* not currently stopped */ 910 if ((p->p_flag & P_STOPPED_TRACE) == 0 || 911 p->p_suspcount != p->p_numthreads || 912 (p->p_flag & P_WAITED) == 0) { 913 error = EBUSY; 914 goto fail; 915 } 916 917 /* OK */ 918 break; 919 } 920 921 /* Keep this process around until we finish this request. */ 922 _PHOLD(p); 923 924 #ifdef FIX_SSTEP 925 /* 926 * Single step fixup ala procfs 927 */ 928 FIX_SSTEP(td2); 929 #endif 930 931 /* 932 * Actually do the requests 933 */ 934 935 td->td_retval[0] = 0; 936 937 switch (req) { 938 case PT_TRACE_ME: 939 /* set my trace flag and "owner" so it can read/write me */ 940 proc_set_traced(p, false); 941 if (p->p_flag & P_PPWAIT) 942 p->p_flag |= P_PPTRACE; 943 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 944 break; 945 946 case PT_ATTACH: 947 /* security check done above */ 948 /* 949 * It would be nice if the tracing relationship was separate 950 * from the parent relationship but that would require 951 * another set of links in the proc struct or for "wait" 952 * to scan the entire proc table. To make life easier, 953 * we just re-parent the process we're trying to trace. 954 * The old parent is remembered so we can put things back 955 * on a "detach". 956 */ 957 proc_set_traced(p, true); 958 proc_reparent(p, td->td_proc, false); 959 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 960 p->p_oppid); 961 962 sx_xunlock(&proctree_lock); 963 proctree_locked = 0; 964 MPASS(p->p_xthread == NULL); 965 MPASS((p->p_flag & P_STOPPED_TRACE) == 0); 966 967 /* 968 * If already stopped due to a stop signal, clear the 969 * existing stop before triggering a traced SIGSTOP. 970 */ 971 if ((p->p_flag & P_STOPPED_SIG) != 0) { 972 PROC_SLOCK(p); 973 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED); 974 thread_unsuspend(p); 975 PROC_SUNLOCK(p); 976 } 977 978 kern_psignal(p, SIGSTOP); 979 break; 980 981 case PT_CLEARSTEP: 982 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 983 p->p_pid); 984 error = ptrace_clear_single_step(td2); 985 break; 986 987 case PT_SETSTEP: 988 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 989 p->p_pid); 990 error = ptrace_single_step(td2); 991 break; 992 993 case PT_SUSPEND: 994 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 995 p->p_pid); 996 td2->td_dbgflags |= TDB_SUSPEND; 997 thread_lock(td2); 998 td2->td_flags |= TDF_NEEDSUSPCHK; 999 thread_unlock(td2); 1000 break; 1001 1002 case PT_RESUME: 1003 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 1004 p->p_pid); 1005 td2->td_dbgflags &= ~TDB_SUSPEND; 1006 break; 1007 1008 case PT_FOLLOW_FORK: 1009 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 1010 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 1011 data ? "enabled" : "disabled"); 1012 if (data) 1013 p->p_ptevents |= PTRACE_FORK; 1014 else 1015 p->p_ptevents &= ~PTRACE_FORK; 1016 break; 1017 1018 case PT_LWP_EVENTS: 1019 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 1020 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 1021 data ? "enabled" : "disabled"); 1022 if (data) 1023 p->p_ptevents |= PTRACE_LWP; 1024 else 1025 p->p_ptevents &= ~PTRACE_LWP; 1026 break; 1027 1028 case PT_GET_EVENT_MASK: 1029 if (data != sizeof(p->p_ptevents)) { 1030 error = EINVAL; 1031 break; 1032 } 1033 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 1034 p->p_ptevents); 1035 *(int *)addr = p->p_ptevents; 1036 break; 1037 1038 case PT_SET_EVENT_MASK: 1039 if (data != sizeof(p->p_ptevents)) { 1040 error = EINVAL; 1041 break; 1042 } 1043 tmp = *(int *)addr; 1044 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 1045 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 1046 error = EINVAL; 1047 break; 1048 } 1049 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1050 p->p_pid, p->p_ptevents, tmp); 1051 p->p_ptevents = tmp; 1052 break; 1053 1054 case PT_GET_SC_ARGS: 1055 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1056 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1057 #ifdef COMPAT_FREEBSD32 1058 || (wrap32 && !safe) 1059 #endif 1060 ) { 1061 error = EINVAL; 1062 break; 1063 } 1064 bzero(addr, sizeof(td2->td_sa.args)); 1065 #ifdef COMPAT_FREEBSD32 1066 if (wrap32) 1067 for (num = 0; num < nitems(td2->td_sa.args); num++) 1068 ((uint32_t *)addr)[num] = (uint32_t) 1069 td2->td_sa.args[num]; 1070 else 1071 #endif 1072 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1073 sizeof(register_t)); 1074 break; 1075 1076 case PT_GET_SC_RET: 1077 if ((td2->td_dbgflags & (TDB_SCX)) == 0 1078 #ifdef COMPAT_FREEBSD32 1079 || (wrap32 && !safe) 1080 #endif 1081 ) { 1082 error = EINVAL; 1083 break; 1084 } 1085 #ifdef COMPAT_FREEBSD32 1086 if (wrap32) { 1087 psr = &r.psr; 1088 psr32 = addr; 1089 } else 1090 #endif 1091 psr = addr; 1092 bzero(psr, sizeof(*psr)); 1093 psr->sr_error = td2->td_errno; 1094 if (psr->sr_error == 0) { 1095 psr->sr_retval[0] = td2->td_retval[0]; 1096 psr->sr_retval[1] = td2->td_retval[1]; 1097 } 1098 #ifdef COMPAT_FREEBSD32 1099 if (wrap32) 1100 ptrace_sc_ret_to32(psr, psr32); 1101 #endif 1102 CTR4(KTR_PTRACE, 1103 "PT_GET_SC_RET: pid %d error %d retval %#lx,%#lx", 1104 p->p_pid, psr->sr_error, psr->sr_retval[0], 1105 psr->sr_retval[1]); 1106 break; 1107 1108 case PT_STEP: 1109 case PT_CONTINUE: 1110 case PT_TO_SCE: 1111 case PT_TO_SCX: 1112 case PT_SYSCALL: 1113 case PT_DETACH: 1114 /* Zero means do not send any signal */ 1115 if (data < 0 || data > _SIG_MAXSIG) { 1116 error = EINVAL; 1117 break; 1118 } 1119 1120 switch (req) { 1121 case PT_STEP: 1122 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1123 td2->td_tid, p->p_pid, data); 1124 error = ptrace_single_step(td2); 1125 if (error) 1126 goto out; 1127 break; 1128 case PT_CONTINUE: 1129 case PT_TO_SCE: 1130 case PT_TO_SCX: 1131 case PT_SYSCALL: 1132 if (addr != (void *)1) { 1133 error = ptrace_set_pc(td2, 1134 (u_long)(uintfptr_t)addr); 1135 if (error) 1136 goto out; 1137 } 1138 switch (req) { 1139 case PT_TO_SCE: 1140 p->p_ptevents |= PTRACE_SCE; 1141 CTR4(KTR_PTRACE, 1142 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1143 p->p_pid, p->p_ptevents, 1144 (u_long)(uintfptr_t)addr, data); 1145 break; 1146 case PT_TO_SCX: 1147 p->p_ptevents |= PTRACE_SCX; 1148 CTR4(KTR_PTRACE, 1149 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1150 p->p_pid, p->p_ptevents, 1151 (u_long)(uintfptr_t)addr, data); 1152 break; 1153 case PT_SYSCALL: 1154 p->p_ptevents |= PTRACE_SYSCALL; 1155 CTR4(KTR_PTRACE, 1156 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1157 p->p_pid, p->p_ptevents, 1158 (u_long)(uintfptr_t)addr, data); 1159 break; 1160 case PT_CONTINUE: 1161 CTR3(KTR_PTRACE, 1162 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1163 p->p_pid, (u_long)(uintfptr_t)addr, data); 1164 break; 1165 } 1166 break; 1167 case PT_DETACH: 1168 /* 1169 * Reset the process parent. 1170 * 1171 * NB: This clears P_TRACED before reparenting 1172 * a detached process back to its original 1173 * parent. Otherwise the debugee will be set 1174 * as an orphan of the debugger. 1175 */ 1176 p->p_flag &= ~(P_TRACED | P_WAITED); 1177 if (p->p_oppid != p->p_pptr->p_pid) { 1178 PROC_LOCK(p->p_pptr); 1179 sigqueue_take(p->p_ksi); 1180 PROC_UNLOCK(p->p_pptr); 1181 1182 pp = proc_realparent(p); 1183 proc_reparent(p, pp, false); 1184 if (pp == initproc) 1185 p->p_sigparent = SIGCHLD; 1186 CTR3(KTR_PTRACE, 1187 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1188 p->p_pid, pp->p_pid, data); 1189 } else 1190 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1191 p->p_pid, data); 1192 p->p_ptevents = 0; 1193 FOREACH_THREAD_IN_PROC(p, td3) { 1194 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1195 sigqueue_delete(&td3->td_sigqueue, 1196 SIGSTOP); 1197 } 1198 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP | 1199 TDB_SUSPEND); 1200 } 1201 1202 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1203 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1204 p->p_flag2 &= ~P2_PTRACE_FSTP; 1205 } 1206 1207 /* should we send SIGCHLD? */ 1208 /* childproc_continued(p); */ 1209 break; 1210 } 1211 1212 sx_xunlock(&proctree_lock); 1213 proctree_locked = 0; 1214 1215 sendsig: 1216 MPASS(proctree_locked == 0); 1217 1218 /* 1219 * Clear the pending event for the thread that just 1220 * reported its event (p_xthread). This may not be 1221 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1222 * the debugger is resuming a different thread. 1223 * 1224 * Deliver any pending signal via the reporting thread. 1225 */ 1226 MPASS(p->p_xthread != NULL); 1227 p->p_xthread->td_dbgflags &= ~TDB_XSIG; 1228 p->p_xthread->td_xsig = data; 1229 p->p_xthread = NULL; 1230 p->p_xsig = data; 1231 1232 /* 1233 * P_WKILLED is insurance that a PT_KILL/SIGKILL 1234 * always works immediately, even if another thread is 1235 * unsuspended first and attempts to handle a 1236 * different signal or if the POSIX.1b style signal 1237 * queue cannot accommodate any new signals. 1238 */ 1239 if (data == SIGKILL) 1240 proc_wkilled(p); 1241 1242 /* 1243 * Unsuspend all threads. To leave a thread 1244 * suspended, use PT_SUSPEND to suspend it before 1245 * continuing the process. 1246 */ 1247 PROC_SLOCK(p); 1248 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED); 1249 thread_unsuspend(p); 1250 PROC_SUNLOCK(p); 1251 break; 1252 1253 case PT_WRITE_I: 1254 case PT_WRITE_D: 1255 td2->td_dbgflags |= TDB_USERWR; 1256 PROC_UNLOCK(p); 1257 error = 0; 1258 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1259 sizeof(int)) != sizeof(int)) 1260 error = ENOMEM; 1261 else 1262 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1263 p->p_pid, addr, data); 1264 PROC_LOCK(p); 1265 break; 1266 1267 case PT_READ_I: 1268 case PT_READ_D: 1269 PROC_UNLOCK(p); 1270 error = tmp = 0; 1271 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1272 sizeof(int)) != sizeof(int)) 1273 error = ENOMEM; 1274 else 1275 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1276 p->p_pid, addr, tmp); 1277 td->td_retval[0] = tmp; 1278 PROC_LOCK(p); 1279 break; 1280 1281 case PT_IO: 1282 #ifdef COMPAT_FREEBSD32 1283 if (wrap32) { 1284 piod32 = addr; 1285 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1286 iov.iov_len = piod32->piod_len; 1287 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1288 uio.uio_resid = piod32->piod_len; 1289 } else 1290 #endif 1291 { 1292 piod = addr; 1293 iov.iov_base = piod->piod_addr; 1294 iov.iov_len = piod->piod_len; 1295 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1296 uio.uio_resid = piod->piod_len; 1297 } 1298 uio.uio_iov = &iov; 1299 uio.uio_iovcnt = 1; 1300 uio.uio_segflg = UIO_USERSPACE; 1301 uio.uio_td = td; 1302 #ifdef COMPAT_FREEBSD32 1303 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1304 #else 1305 tmp = piod->piod_op; 1306 #endif 1307 switch (tmp) { 1308 case PIOD_READ_D: 1309 case PIOD_READ_I: 1310 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1311 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1312 uio.uio_rw = UIO_READ; 1313 break; 1314 case PIOD_WRITE_D: 1315 case PIOD_WRITE_I: 1316 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1317 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1318 td2->td_dbgflags |= TDB_USERWR; 1319 uio.uio_rw = UIO_WRITE; 1320 break; 1321 default: 1322 error = EINVAL; 1323 goto out; 1324 } 1325 PROC_UNLOCK(p); 1326 error = proc_rwmem(p, &uio); 1327 #ifdef COMPAT_FREEBSD32 1328 if (wrap32) 1329 piod32->piod_len -= uio.uio_resid; 1330 else 1331 #endif 1332 piod->piod_len -= uio.uio_resid; 1333 PROC_LOCK(p); 1334 break; 1335 1336 case PT_KILL: 1337 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1338 data = SIGKILL; 1339 goto sendsig; /* in PT_CONTINUE above */ 1340 1341 case PT_SETREGS: 1342 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1343 p->p_pid); 1344 td2->td_dbgflags |= TDB_USERWR; 1345 error = PROC_WRITE(regs, td2, addr); 1346 break; 1347 1348 case PT_GETREGS: 1349 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1350 p->p_pid); 1351 error = PROC_READ(regs, td2, addr); 1352 break; 1353 1354 case PT_SETFPREGS: 1355 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1356 p->p_pid); 1357 td2->td_dbgflags |= TDB_USERWR; 1358 error = PROC_WRITE(fpregs, td2, addr); 1359 break; 1360 1361 case PT_GETFPREGS: 1362 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1363 p->p_pid); 1364 error = PROC_READ(fpregs, td2, addr); 1365 break; 1366 1367 case PT_SETDBREGS: 1368 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1369 p->p_pid); 1370 td2->td_dbgflags |= TDB_USERWR; 1371 error = PROC_WRITE(dbregs, td2, addr); 1372 break; 1373 1374 case PT_GETDBREGS: 1375 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1376 p->p_pid); 1377 error = PROC_READ(dbregs, td2, addr); 1378 break; 1379 1380 case PT_LWPINFO: 1381 if (data <= 0 || 1382 #ifdef COMPAT_FREEBSD32 1383 (!wrap32 && data > sizeof(*pl)) || 1384 (wrap32 && data > sizeof(*pl32))) { 1385 #else 1386 data > sizeof(*pl)) { 1387 #endif 1388 error = EINVAL; 1389 break; 1390 } 1391 #ifdef COMPAT_FREEBSD32 1392 if (wrap32) { 1393 pl = &r.pl; 1394 pl32 = addr; 1395 } else 1396 #endif 1397 pl = addr; 1398 bzero(pl, sizeof(*pl)); 1399 pl->pl_lwpid = td2->td_tid; 1400 pl->pl_event = PL_EVENT_NONE; 1401 pl->pl_flags = 0; 1402 if (td2->td_dbgflags & TDB_XSIG) { 1403 pl->pl_event = PL_EVENT_SIGNAL; 1404 if (td2->td_si.si_signo != 0 && 1405 #ifdef COMPAT_FREEBSD32 1406 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1407 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1408 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1409 pl_siginfo) + sizeof(struct siginfo32))) 1410 #else 1411 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1412 + sizeof(pl->pl_siginfo) 1413 #endif 1414 ){ 1415 pl->pl_flags |= PL_FLAG_SI; 1416 pl->pl_siginfo = td2->td_si; 1417 } 1418 } 1419 if (td2->td_dbgflags & TDB_SCE) 1420 pl->pl_flags |= PL_FLAG_SCE; 1421 else if (td2->td_dbgflags & TDB_SCX) 1422 pl->pl_flags |= PL_FLAG_SCX; 1423 if (td2->td_dbgflags & TDB_EXEC) 1424 pl->pl_flags |= PL_FLAG_EXEC; 1425 if (td2->td_dbgflags & TDB_FORK) { 1426 pl->pl_flags |= PL_FLAG_FORKED; 1427 pl->pl_child_pid = td2->td_dbg_forked; 1428 if (td2->td_dbgflags & TDB_VFORK) 1429 pl->pl_flags |= PL_FLAG_VFORKED; 1430 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1431 TDB_VFORK) 1432 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1433 if (td2->td_dbgflags & TDB_CHILD) 1434 pl->pl_flags |= PL_FLAG_CHILD; 1435 if (td2->td_dbgflags & TDB_BORN) 1436 pl->pl_flags |= PL_FLAG_BORN; 1437 if (td2->td_dbgflags & TDB_EXIT) 1438 pl->pl_flags |= PL_FLAG_EXITED; 1439 pl->pl_sigmask = td2->td_sigmask; 1440 pl->pl_siglist = td2->td_siglist; 1441 strcpy(pl->pl_tdname, td2->td_name); 1442 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1443 pl->pl_syscall_code = td2->td_sa.code; 1444 pl->pl_syscall_narg = td2->td_sa.narg; 1445 } else { 1446 pl->pl_syscall_code = 0; 1447 pl->pl_syscall_narg = 0; 1448 } 1449 #ifdef COMPAT_FREEBSD32 1450 if (wrap32) 1451 ptrace_lwpinfo_to32(pl, pl32); 1452 #endif 1453 CTR6(KTR_PTRACE, 1454 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1455 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1456 pl->pl_child_pid, pl->pl_syscall_code); 1457 break; 1458 1459 case PT_GETNUMLWPS: 1460 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1461 p->p_numthreads); 1462 td->td_retval[0] = p->p_numthreads; 1463 break; 1464 1465 case PT_GETLWPLIST: 1466 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1467 p->p_pid, data, p->p_numthreads); 1468 if (data <= 0) { 1469 error = EINVAL; 1470 break; 1471 } 1472 num = imin(p->p_numthreads, data); 1473 PROC_UNLOCK(p); 1474 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1475 tmp = 0; 1476 PROC_LOCK(p); 1477 FOREACH_THREAD_IN_PROC(p, td2) { 1478 if (tmp >= num) 1479 break; 1480 buf[tmp++] = td2->td_tid; 1481 } 1482 PROC_UNLOCK(p); 1483 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1484 free(buf, M_TEMP); 1485 if (!error) 1486 td->td_retval[0] = tmp; 1487 PROC_LOCK(p); 1488 break; 1489 1490 case PT_VM_TIMESTAMP: 1491 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1492 p->p_pid, p->p_vmspace->vm_map.timestamp); 1493 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1494 break; 1495 1496 case PT_VM_ENTRY: 1497 PROC_UNLOCK(p); 1498 #ifdef COMPAT_FREEBSD32 1499 if (wrap32) 1500 error = ptrace_vm_entry32(td, p, addr); 1501 else 1502 #endif 1503 error = ptrace_vm_entry(td, p, addr); 1504 PROC_LOCK(p); 1505 break; 1506 1507 default: 1508 #ifdef __HAVE_PTRACE_MACHDEP 1509 if (req >= PT_FIRSTMACH) { 1510 PROC_UNLOCK(p); 1511 error = cpu_ptrace(td2, req, addr, data); 1512 PROC_LOCK(p); 1513 } else 1514 #endif 1515 /* Unknown request. */ 1516 error = EINVAL; 1517 break; 1518 } 1519 1520 out: 1521 /* Drop our hold on this process now that the request has completed. */ 1522 _PRELE(p); 1523 fail: 1524 PROC_UNLOCK(p); 1525 if (proctree_locked) 1526 sx_xunlock(&proctree_lock); 1527 return (error); 1528 } 1529 #undef PROC_READ 1530 #undef PROC_WRITE 1531 1532 /* 1533 * Stop a process because of a debugging event; 1534 * stay stopped until p->p_step is cleared 1535 * (cleared by PIOCCONT in procfs). 1536 */ 1537 void 1538 stopevent(struct proc *p, unsigned int event, unsigned int val) 1539 { 1540 1541 PROC_LOCK_ASSERT(p, MA_OWNED); 1542 p->p_step = 1; 1543 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1544 val); 1545 do { 1546 if (event != S_EXIT) 1547 p->p_xsig = val; 1548 p->p_xthread = NULL; 1549 p->p_stype = event; /* Which event caused the stop? */ 1550 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1551 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1552 } while (p->p_step); 1553 } 1554