1 /*- 2 * Copyright (c) 1994, Sean Eric Fagan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Sean Eric Fagan. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_compat.h" 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 int error; 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 error = 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 while (entry != &map->header && 392 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 393 entry = entry->next; 394 index++; 395 } 396 if (entry == &map->header) { 397 error = ENOENT; 398 break; 399 } 400 401 /* We got an entry. */ 402 pve->pve_entry = index + 1; 403 pve->pve_timestamp = map->timestamp; 404 pve->pve_start = entry->start; 405 pve->pve_end = entry->end - 1; 406 pve->pve_offset = entry->offset; 407 pve->pve_prot = entry->protection; 408 409 /* Backing object's path needed? */ 410 if (pve->pve_pathlen == 0) 411 break; 412 413 pathlen = pve->pve_pathlen; 414 pve->pve_pathlen = 0; 415 416 obj = entry->object.vm_object; 417 if (obj != NULL) 418 VM_OBJECT_RLOCK(obj); 419 } while (0); 420 421 vm_map_unlock_read(map); 422 423 pve->pve_fsid = VNOVAL; 424 pve->pve_fileid = VNOVAL; 425 426 if (error == 0 && obj != NULL) { 427 lobj = obj; 428 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 429 if (tobj != obj) 430 VM_OBJECT_RLOCK(tobj); 431 if (lobj != obj) 432 VM_OBJECT_RUNLOCK(lobj); 433 lobj = tobj; 434 pve->pve_offset += tobj->backing_object_offset; 435 } 436 vp = vm_object_vnode(lobj); 437 if (vp != NULL) 438 vref(vp); 439 if (lobj != obj) 440 VM_OBJECT_RUNLOCK(lobj); 441 VM_OBJECT_RUNLOCK(obj); 442 443 if (vp != NULL) { 444 freepath = NULL; 445 fullpath = NULL; 446 vn_fullpath(td, vp, &fullpath, &freepath); 447 vn_lock(vp, LK_SHARED | LK_RETRY); 448 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 449 pve->pve_fileid = vattr.va_fileid; 450 pve->pve_fsid = vattr.va_fsid; 451 } 452 vput(vp); 453 454 if (fullpath != NULL) { 455 pve->pve_pathlen = strlen(fullpath) + 1; 456 if (pve->pve_pathlen <= pathlen) { 457 error = copyout(fullpath, pve->pve_path, 458 pve->pve_pathlen); 459 } else 460 error = ENAMETOOLONG; 461 } 462 if (freepath != NULL) 463 free(freepath, M_TEMP); 464 } 465 } 466 vmspace_free(vm); 467 if (error == 0) 468 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 469 p->p_pid, pve->pve_entry, pve->pve_start); 470 471 return (error); 472 } 473 474 #ifdef COMPAT_FREEBSD32 475 static int 476 ptrace_vm_entry32(struct thread *td, struct proc *p, 477 struct ptrace_vm_entry32 *pve32) 478 { 479 struct ptrace_vm_entry pve; 480 int error; 481 482 pve.pve_entry = pve32->pve_entry; 483 pve.pve_pathlen = pve32->pve_pathlen; 484 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 485 486 error = ptrace_vm_entry(td, p, &pve); 487 if (error == 0) { 488 pve32->pve_entry = pve.pve_entry; 489 pve32->pve_timestamp = pve.pve_timestamp; 490 pve32->pve_start = pve.pve_start; 491 pve32->pve_end = pve.pve_end; 492 pve32->pve_offset = pve.pve_offset; 493 pve32->pve_prot = pve.pve_prot; 494 pve32->pve_fileid = pve.pve_fileid; 495 pve32->pve_fsid = pve.pve_fsid; 496 } 497 498 pve32->pve_pathlen = pve.pve_pathlen; 499 return (error); 500 } 501 502 static void 503 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 504 struct ptrace_lwpinfo32 *pl32) 505 { 506 507 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_SIG | 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 if ((p->p_flag & P_STOPPED_TRACE) == 0) { 879 static int count = 0; 880 if (count++ == 0) 881 printf("P_STOPPED_TRACE not set.\n"); 882 } 883 884 /* OK */ 885 break; 886 } 887 888 /* Keep this process around until we finish this request. */ 889 _PHOLD(p); 890 891 #ifdef FIX_SSTEP 892 /* 893 * Single step fixup ala procfs 894 */ 895 FIX_SSTEP(td2); 896 #endif 897 898 /* 899 * Actually do the requests 900 */ 901 902 td->td_retval[0] = 0; 903 904 switch (req) { 905 case PT_TRACE_ME: 906 /* set my trace flag and "owner" so it can read/write me */ 907 proc_set_traced(p, false); 908 if (p->p_flag & P_PPWAIT) 909 p->p_flag |= P_PPTRACE; 910 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 911 break; 912 913 case PT_ATTACH: 914 /* security check done above */ 915 /* 916 * It would be nice if the tracing relationship was separate 917 * from the parent relationship but that would require 918 * another set of links in the proc struct or for "wait" 919 * to scan the entire proc table. To make life easier, 920 * we just re-parent the process we're trying to trace. 921 * The old parent is remembered so we can put things back 922 * on a "detach". 923 */ 924 proc_set_traced(p, true); 925 if (p->p_pptr != td->td_proc) { 926 proc_reparent(p, td->td_proc); 927 } 928 data = SIGSTOP; 929 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 930 p->p_oppid); 931 goto sendsig; /* in PT_CONTINUE below */ 932 933 case PT_CLEARSTEP: 934 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 935 p->p_pid); 936 error = ptrace_clear_single_step(td2); 937 break; 938 939 case PT_SETSTEP: 940 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 941 p->p_pid); 942 error = ptrace_single_step(td2); 943 break; 944 945 case PT_SUSPEND: 946 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 947 p->p_pid); 948 td2->td_dbgflags |= TDB_SUSPEND; 949 thread_lock(td2); 950 td2->td_flags |= TDF_NEEDSUSPCHK; 951 thread_unlock(td2); 952 break; 953 954 case PT_RESUME: 955 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 956 p->p_pid); 957 td2->td_dbgflags &= ~TDB_SUSPEND; 958 break; 959 960 case PT_FOLLOW_FORK: 961 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 962 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 963 data ? "enabled" : "disabled"); 964 if (data) 965 p->p_ptevents |= PTRACE_FORK; 966 else 967 p->p_ptevents &= ~PTRACE_FORK; 968 break; 969 970 case PT_LWP_EVENTS: 971 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 972 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 973 data ? "enabled" : "disabled"); 974 if (data) 975 p->p_ptevents |= PTRACE_LWP; 976 else 977 p->p_ptevents &= ~PTRACE_LWP; 978 break; 979 980 case PT_GET_EVENT_MASK: 981 if (data != sizeof(p->p_ptevents)) { 982 error = EINVAL; 983 break; 984 } 985 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 986 p->p_ptevents); 987 *(int *)addr = p->p_ptevents; 988 break; 989 990 case PT_SET_EVENT_MASK: 991 if (data != sizeof(p->p_ptevents)) { 992 error = EINVAL; 993 break; 994 } 995 tmp = *(int *)addr; 996 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 997 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 998 error = EINVAL; 999 break; 1000 } 1001 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1002 p->p_pid, p->p_ptevents, tmp); 1003 p->p_ptevents = tmp; 1004 break; 1005 1006 case PT_GET_SC_ARGS: 1007 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1008 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1009 #ifdef COMPAT_FREEBSD32 1010 || (wrap32 && !safe) 1011 #endif 1012 ) { 1013 error = EINVAL; 1014 break; 1015 } 1016 bzero(addr, sizeof(td2->td_sa.args)); 1017 #ifdef COMPAT_FREEBSD32 1018 if (wrap32) 1019 for (num = 0; num < nitems(td2->td_sa.args); num++) 1020 ((uint32_t *)addr)[num] = (uint32_t) 1021 td2->td_sa.args[num]; 1022 else 1023 #endif 1024 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1025 sizeof(register_t)); 1026 break; 1027 1028 case PT_STEP: 1029 case PT_CONTINUE: 1030 case PT_TO_SCE: 1031 case PT_TO_SCX: 1032 case PT_SYSCALL: 1033 case PT_DETACH: 1034 /* Zero means do not send any signal */ 1035 if (data < 0 || data > _SIG_MAXSIG) { 1036 error = EINVAL; 1037 break; 1038 } 1039 1040 switch (req) { 1041 case PT_STEP: 1042 CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)", 1043 td2->td_tid, p->p_pid); 1044 error = ptrace_single_step(td2); 1045 if (error) 1046 goto out; 1047 break; 1048 case PT_CONTINUE: 1049 case PT_TO_SCE: 1050 case PT_TO_SCX: 1051 case PT_SYSCALL: 1052 if (addr != (void *)1) { 1053 error = ptrace_set_pc(td2, 1054 (u_long)(uintfptr_t)addr); 1055 if (error) 1056 goto out; 1057 } 1058 switch (req) { 1059 case PT_TO_SCE: 1060 p->p_ptevents |= PTRACE_SCE; 1061 CTR4(KTR_PTRACE, 1062 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1063 p->p_pid, p->p_ptevents, 1064 (u_long)(uintfptr_t)addr, data); 1065 break; 1066 case PT_TO_SCX: 1067 p->p_ptevents |= PTRACE_SCX; 1068 CTR4(KTR_PTRACE, 1069 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1070 p->p_pid, p->p_ptevents, 1071 (u_long)(uintfptr_t)addr, data); 1072 break; 1073 case PT_SYSCALL: 1074 p->p_ptevents |= PTRACE_SYSCALL; 1075 CTR4(KTR_PTRACE, 1076 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1077 p->p_pid, p->p_ptevents, 1078 (u_long)(uintfptr_t)addr, data); 1079 break; 1080 case PT_CONTINUE: 1081 CTR3(KTR_PTRACE, 1082 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1083 p->p_pid, (u_long)(uintfptr_t)addr, data); 1084 break; 1085 } 1086 break; 1087 case PT_DETACH: 1088 /* 1089 * Reset the process parent. 1090 * 1091 * NB: This clears P_TRACED before reparenting 1092 * a detached process back to its original 1093 * parent. Otherwise the debugee will be set 1094 * as an orphan of the debugger. 1095 */ 1096 p->p_flag &= ~(P_TRACED | P_WAITED); 1097 if (p->p_oppid != p->p_pptr->p_pid) { 1098 PROC_LOCK(p->p_pptr); 1099 sigqueue_take(p->p_ksi); 1100 PROC_UNLOCK(p->p_pptr); 1101 1102 pp = proc_realparent(p); 1103 proc_reparent(p, pp); 1104 if (pp == initproc) 1105 p->p_sigparent = SIGCHLD; 1106 CTR3(KTR_PTRACE, 1107 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1108 p->p_pid, pp->p_pid, data); 1109 } else 1110 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1111 p->p_pid, data); 1112 p->p_oppid = 0; 1113 p->p_ptevents = 0; 1114 FOREACH_THREAD_IN_PROC(p, td3) { 1115 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1116 sigqueue_delete(&td3->td_sigqueue, 1117 SIGSTOP); 1118 } 1119 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP); 1120 } 1121 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1122 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1123 p->p_flag2 &= ~P2_PTRACE_FSTP; 1124 } 1125 1126 /* should we send SIGCHLD? */ 1127 /* childproc_continued(p); */ 1128 break; 1129 } 1130 1131 sendsig: 1132 if (proctree_locked) { 1133 sx_xunlock(&proctree_lock); 1134 proctree_locked = 0; 1135 } 1136 p->p_xsig = data; 1137 p->p_xthread = NULL; 1138 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) { 1139 /* deliver or queue signal */ 1140 td2->td_dbgflags &= ~TDB_XSIG; 1141 td2->td_xsig = data; 1142 1143 /* 1144 * P_WKILLED is insurance that a PT_KILL/SIGKILL always 1145 * works immediately, even if another thread is 1146 * unsuspended first and attempts to handle a different 1147 * signal or if the POSIX.1b style signal queue cannot 1148 * accommodate any new signals. 1149 */ 1150 if (data == SIGKILL) 1151 p->p_flag |= P_WKILLED; 1152 1153 if (req == PT_DETACH) { 1154 FOREACH_THREAD_IN_PROC(p, td3) 1155 td3->td_dbgflags &= ~TDB_SUSPEND; 1156 } 1157 /* 1158 * unsuspend all threads, to not let a thread run, 1159 * you should use PT_SUSPEND to suspend it before 1160 * continuing process. 1161 */ 1162 PROC_SLOCK(p); 1163 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED); 1164 thread_unsuspend(p); 1165 PROC_SUNLOCK(p); 1166 if (req == PT_ATTACH) 1167 kern_psignal(p, data); 1168 } else { 1169 if (data) 1170 kern_psignal(p, data); 1171 } 1172 break; 1173 1174 case PT_WRITE_I: 1175 case PT_WRITE_D: 1176 td2->td_dbgflags |= TDB_USERWR; 1177 PROC_UNLOCK(p); 1178 error = 0; 1179 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1180 sizeof(int)) != sizeof(int)) 1181 error = ENOMEM; 1182 else 1183 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1184 p->p_pid, addr, data); 1185 PROC_LOCK(p); 1186 break; 1187 1188 case PT_READ_I: 1189 case PT_READ_D: 1190 PROC_UNLOCK(p); 1191 error = tmp = 0; 1192 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1193 sizeof(int)) != sizeof(int)) 1194 error = ENOMEM; 1195 else 1196 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1197 p->p_pid, addr, tmp); 1198 td->td_retval[0] = tmp; 1199 PROC_LOCK(p); 1200 break; 1201 1202 case PT_IO: 1203 #ifdef COMPAT_FREEBSD32 1204 if (wrap32) { 1205 piod32 = addr; 1206 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1207 iov.iov_len = piod32->piod_len; 1208 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1209 uio.uio_resid = piod32->piod_len; 1210 } else 1211 #endif 1212 { 1213 piod = addr; 1214 iov.iov_base = piod->piod_addr; 1215 iov.iov_len = piod->piod_len; 1216 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1217 uio.uio_resid = piod->piod_len; 1218 } 1219 uio.uio_iov = &iov; 1220 uio.uio_iovcnt = 1; 1221 uio.uio_segflg = UIO_USERSPACE; 1222 uio.uio_td = td; 1223 #ifdef COMPAT_FREEBSD32 1224 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1225 #else 1226 tmp = piod->piod_op; 1227 #endif 1228 switch (tmp) { 1229 case PIOD_READ_D: 1230 case PIOD_READ_I: 1231 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1232 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1233 uio.uio_rw = UIO_READ; 1234 break; 1235 case PIOD_WRITE_D: 1236 case PIOD_WRITE_I: 1237 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1238 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1239 td2->td_dbgflags |= TDB_USERWR; 1240 uio.uio_rw = UIO_WRITE; 1241 break; 1242 default: 1243 error = EINVAL; 1244 goto out; 1245 } 1246 PROC_UNLOCK(p); 1247 error = proc_rwmem(p, &uio); 1248 #ifdef COMPAT_FREEBSD32 1249 if (wrap32) 1250 piod32->piod_len -= uio.uio_resid; 1251 else 1252 #endif 1253 piod->piod_len -= uio.uio_resid; 1254 PROC_LOCK(p); 1255 break; 1256 1257 case PT_KILL: 1258 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1259 data = SIGKILL; 1260 goto sendsig; /* in PT_CONTINUE above */ 1261 1262 case PT_SETREGS: 1263 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1264 p->p_pid); 1265 td2->td_dbgflags |= TDB_USERWR; 1266 error = PROC_WRITE(regs, td2, addr); 1267 break; 1268 1269 case PT_GETREGS: 1270 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1271 p->p_pid); 1272 error = PROC_READ(regs, td2, addr); 1273 break; 1274 1275 case PT_SETFPREGS: 1276 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1277 p->p_pid); 1278 td2->td_dbgflags |= TDB_USERWR; 1279 error = PROC_WRITE(fpregs, td2, addr); 1280 break; 1281 1282 case PT_GETFPREGS: 1283 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1284 p->p_pid); 1285 error = PROC_READ(fpregs, td2, addr); 1286 break; 1287 1288 case PT_SETDBREGS: 1289 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1290 p->p_pid); 1291 td2->td_dbgflags |= TDB_USERWR; 1292 error = PROC_WRITE(dbregs, td2, addr); 1293 break; 1294 1295 case PT_GETDBREGS: 1296 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1297 p->p_pid); 1298 error = PROC_READ(dbregs, td2, addr); 1299 break; 1300 1301 case PT_LWPINFO: 1302 if (data <= 0 || 1303 #ifdef COMPAT_FREEBSD32 1304 (!wrap32 && data > sizeof(*pl)) || 1305 (wrap32 && data > sizeof(*pl32))) { 1306 #else 1307 data > sizeof(*pl)) { 1308 #endif 1309 error = EINVAL; 1310 break; 1311 } 1312 #ifdef COMPAT_FREEBSD32 1313 if (wrap32) { 1314 pl = &plr; 1315 pl32 = addr; 1316 } else 1317 #endif 1318 pl = addr; 1319 pl->pl_lwpid = td2->td_tid; 1320 pl->pl_event = PL_EVENT_NONE; 1321 pl->pl_flags = 0; 1322 if (td2->td_dbgflags & TDB_XSIG) { 1323 pl->pl_event = PL_EVENT_SIGNAL; 1324 if (td2->td_si.si_signo != 0 && 1325 #ifdef COMPAT_FREEBSD32 1326 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1327 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1328 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1329 pl_siginfo) + sizeof(struct siginfo32))) 1330 #else 1331 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1332 + sizeof(pl->pl_siginfo) 1333 #endif 1334 ){ 1335 pl->pl_flags |= PL_FLAG_SI; 1336 pl->pl_siginfo = td2->td_si; 1337 } 1338 } 1339 if ((pl->pl_flags & PL_FLAG_SI) == 0) 1340 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo)); 1341 if (td2->td_dbgflags & TDB_SCE) 1342 pl->pl_flags |= PL_FLAG_SCE; 1343 else if (td2->td_dbgflags & TDB_SCX) 1344 pl->pl_flags |= PL_FLAG_SCX; 1345 if (td2->td_dbgflags & TDB_EXEC) 1346 pl->pl_flags |= PL_FLAG_EXEC; 1347 if (td2->td_dbgflags & TDB_FORK) { 1348 pl->pl_flags |= PL_FLAG_FORKED; 1349 pl->pl_child_pid = td2->td_dbg_forked; 1350 if (td2->td_dbgflags & TDB_VFORK) 1351 pl->pl_flags |= PL_FLAG_VFORKED; 1352 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1353 TDB_VFORK) 1354 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1355 if (td2->td_dbgflags & TDB_CHILD) 1356 pl->pl_flags |= PL_FLAG_CHILD; 1357 if (td2->td_dbgflags & TDB_BORN) 1358 pl->pl_flags |= PL_FLAG_BORN; 1359 if (td2->td_dbgflags & TDB_EXIT) 1360 pl->pl_flags |= PL_FLAG_EXITED; 1361 pl->pl_sigmask = td2->td_sigmask; 1362 pl->pl_siglist = td2->td_siglist; 1363 strcpy(pl->pl_tdname, td2->td_name); 1364 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1365 pl->pl_syscall_code = td2->td_sa.code; 1366 pl->pl_syscall_narg = td2->td_sa.narg; 1367 } else { 1368 pl->pl_syscall_code = 0; 1369 pl->pl_syscall_narg = 0; 1370 } 1371 #ifdef COMPAT_FREEBSD32 1372 if (wrap32) 1373 ptrace_lwpinfo_to32(pl, pl32); 1374 #endif 1375 CTR6(KTR_PTRACE, 1376 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1377 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1378 pl->pl_child_pid, pl->pl_syscall_code); 1379 break; 1380 1381 case PT_GETNUMLWPS: 1382 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1383 p->p_numthreads); 1384 td->td_retval[0] = p->p_numthreads; 1385 break; 1386 1387 case PT_GETLWPLIST: 1388 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1389 p->p_pid, data, p->p_numthreads); 1390 if (data <= 0) { 1391 error = EINVAL; 1392 break; 1393 } 1394 num = imin(p->p_numthreads, data); 1395 PROC_UNLOCK(p); 1396 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1397 tmp = 0; 1398 PROC_LOCK(p); 1399 FOREACH_THREAD_IN_PROC(p, td2) { 1400 if (tmp >= num) 1401 break; 1402 buf[tmp++] = td2->td_tid; 1403 } 1404 PROC_UNLOCK(p); 1405 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1406 free(buf, M_TEMP); 1407 if (!error) 1408 td->td_retval[0] = tmp; 1409 PROC_LOCK(p); 1410 break; 1411 1412 case PT_VM_TIMESTAMP: 1413 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1414 p->p_pid, p->p_vmspace->vm_map.timestamp); 1415 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1416 break; 1417 1418 case PT_VM_ENTRY: 1419 PROC_UNLOCK(p); 1420 #ifdef COMPAT_FREEBSD32 1421 if (wrap32) 1422 error = ptrace_vm_entry32(td, p, addr); 1423 else 1424 #endif 1425 error = ptrace_vm_entry(td, p, addr); 1426 PROC_LOCK(p); 1427 break; 1428 1429 default: 1430 #ifdef __HAVE_PTRACE_MACHDEP 1431 if (req >= PT_FIRSTMACH) { 1432 PROC_UNLOCK(p); 1433 error = cpu_ptrace(td2, req, addr, data); 1434 PROC_LOCK(p); 1435 } else 1436 #endif 1437 /* Unknown request. */ 1438 error = EINVAL; 1439 break; 1440 } 1441 1442 out: 1443 /* Drop our hold on this process now that the request has completed. */ 1444 _PRELE(p); 1445 fail: 1446 PROC_UNLOCK(p); 1447 if (proctree_locked) 1448 sx_xunlock(&proctree_lock); 1449 return (error); 1450 } 1451 #undef PROC_READ 1452 #undef PROC_WRITE 1453 1454 /* 1455 * Stop a process because of a debugging event; 1456 * stay stopped until p->p_step is cleared 1457 * (cleared by PIOCCONT in procfs). 1458 */ 1459 void 1460 stopevent(struct proc *p, unsigned int event, unsigned int val) 1461 { 1462 1463 PROC_LOCK_ASSERT(p, MA_OWNED); 1464 p->p_step = 1; 1465 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1466 val); 1467 do { 1468 if (event != S_EXIT) 1469 p->p_xsig = val; 1470 p->p_xthread = NULL; 1471 p->p_stype = event; /* Which event caused the stop? */ 1472 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1473 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1474 } while (p->p_step); 1475 } 1476