sys_process.c revision 328379
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: stable/11/sys/kern/sys_process.c 328379 2018-01-24 21:48:39Z jhb $"); 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 71struct ptrace_io_desc32 { 72 int piod_op; 73 uint32_t piod_offs; 74 uint32_t piod_addr; 75 uint32_t piod_len; 76}; 77 78struct 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 129int 130proc_read_regs(struct thread *td, struct reg *regs) 131{ 132 133 PROC_ACTION(fill_regs(td, regs)); 134} 135 136int 137proc_write_regs(struct thread *td, struct reg *regs) 138{ 139 140 PROC_ACTION(set_regs(td, regs)); 141} 142 143int 144proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 145{ 146 147 PROC_ACTION(fill_dbregs(td, dbregs)); 148} 149 150int 151proc_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 */ 161int 162proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 163{ 164 165 PROC_ACTION(fill_fpregs(td, fpregs)); 166} 167 168int 169proc_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. */ 177int 178proc_read_regs32(struct thread *td, struct reg32 *regs32) 179{ 180 181 PROC_ACTION(fill_regs32(td, regs32)); 182} 183 184int 185proc_write_regs32(struct thread *td, struct reg32 *regs32) 186{ 187 188 PROC_ACTION(set_regs32(td, regs32)); 189} 190 191int 192proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 193{ 194 195 PROC_ACTION(fill_dbregs32(td, dbregs32)); 196} 197 198int 199proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 200{ 201 202 PROC_ACTION(set_dbregs32(td, dbregs32)); 203} 204 205int 206proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 207{ 208 209 PROC_ACTION(fill_fpregs32(td, fpregs32)); 210} 211 212int 213proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 214{ 215 216 PROC_ACTION(set_fpregs32(td, fpregs32)); 217} 218#endif 219 220int 221proc_sstep(struct thread *td) 222{ 223 224 PROC_ACTION(ptrace_single_step(td)); 225} 226 227int 228proc_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 317static ssize_t 318proc_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 344ssize_t 345proc_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 352ssize_t 353proc_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 360static int 361ptrace_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 475static int 476ptrace_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 502static void 503ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 504 struct ptrace_lwpinfo32 *pl32) 505{ 506 507 bzero(pl32, sizeof(*pl32)); 508 pl32->pl_lwpid = pl->pl_lwpid; 509 pl32->pl_event = pl->pl_event; 510 pl32->pl_flags = pl->pl_flags; 511 pl32->pl_sigmask = pl->pl_sigmask; 512 pl32->pl_siglist = pl->pl_siglist; 513 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 514 strcpy(pl32->pl_tdname, pl->pl_tdname); 515 pl32->pl_child_pid = pl->pl_child_pid; 516 pl32->pl_syscall_code = pl->pl_syscall_code; 517 pl32->pl_syscall_narg = pl->pl_syscall_narg; 518} 519#endif /* COMPAT_FREEBSD32 */ 520 521/* 522 * Process debugging system call. 523 */ 524#ifndef _SYS_SYSPROTO_H_ 525struct ptrace_args { 526 int req; 527 pid_t pid; 528 caddr_t addr; 529 int data; 530}; 531#endif 532 533#ifdef COMPAT_FREEBSD32 534/* 535 * This CPP subterfuge is to try and reduce the number of ifdefs in 536 * the body of the code. 537 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 538 * becomes either: 539 * copyin(uap->addr, &r.reg, sizeof r.reg); 540 * or 541 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 542 * .. except this is done at runtime. 543 */ 544#define COPYIN(u, k, s) wrap32 ? \ 545 copyin(u, k ## 32, s ## 32) : \ 546 copyin(u, k, s) 547#define COPYOUT(k, u, s) wrap32 ? \ 548 copyout(k ## 32, u, s ## 32) : \ 549 copyout(k, u, s) 550#else 551#define COPYIN(u, k, s) copyin(u, k, s) 552#define COPYOUT(k, u, s) copyout(k, u, s) 553#endif 554int 555sys_ptrace(struct thread *td, struct ptrace_args *uap) 556{ 557 /* 558 * XXX this obfuscation is to reduce stack usage, but the register 559 * structs may be too large to put on the stack anyway. 560 */ 561 union { 562 struct ptrace_io_desc piod; 563 struct ptrace_lwpinfo pl; 564 struct ptrace_vm_entry pve; 565 struct dbreg dbreg; 566 struct fpreg fpreg; 567 struct reg reg; 568#ifdef COMPAT_FREEBSD32 569 struct dbreg32 dbreg32; 570 struct fpreg32 fpreg32; 571 struct reg32 reg32; 572 struct ptrace_io_desc32 piod32; 573 struct ptrace_lwpinfo32 pl32; 574 struct ptrace_vm_entry32 pve32; 575#endif 576 char args[nitems(td->td_sa.args) * sizeof(register_t)]; 577 int ptevents; 578 } r; 579 void *addr; 580 int error = 0; 581#ifdef COMPAT_FREEBSD32 582 int wrap32 = 0; 583 584 if (SV_CURPROC_FLAG(SV_ILP32)) 585 wrap32 = 1; 586#endif 587 AUDIT_ARG_PID(uap->pid); 588 AUDIT_ARG_CMD(uap->req); 589 AUDIT_ARG_VALUE(uap->data); 590 addr = &r; 591 switch (uap->req) { 592 case PT_GET_EVENT_MASK: 593 case PT_GETREGS: 594 case PT_GETFPREGS: 595 case PT_GETDBREGS: 596 case PT_LWPINFO: 597 case PT_GET_SC_ARGS: 598 break; 599 case PT_SETREGS: 600 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 601 break; 602 case PT_SETFPREGS: 603 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 604 break; 605 case PT_SETDBREGS: 606 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 607 break; 608 case PT_SET_EVENT_MASK: 609 if (uap->data != sizeof(r.ptevents)) 610 error = EINVAL; 611 else 612 error = copyin(uap->addr, &r.ptevents, uap->data); 613 break; 614 case PT_IO: 615 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 616 break; 617 case PT_VM_ENTRY: 618 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 619 break; 620 default: 621 addr = uap->addr; 622 break; 623 } 624 if (error) 625 return (error); 626 627 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 628 if (error) 629 return (error); 630 631 switch (uap->req) { 632 case PT_VM_ENTRY: 633 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 634 break; 635 case PT_IO: 636 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 637 break; 638 case PT_GETREGS: 639 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 640 break; 641 case PT_GETFPREGS: 642 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 643 break; 644 case PT_GETDBREGS: 645 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 646 break; 647 case PT_GET_EVENT_MASK: 648 /* NB: The size in uap->data is validated in kern_ptrace(). */ 649 error = copyout(&r.ptevents, uap->addr, uap->data); 650 break; 651 case PT_LWPINFO: 652 /* NB: The size in uap->data is validated in kern_ptrace(). */ 653 error = copyout(&r.pl, uap->addr, uap->data); 654 break; 655 case PT_GET_SC_ARGS: 656 error = copyout(r.args, uap->addr, MIN(uap->data, 657 sizeof(r.args))); 658 break; 659 } 660 661 return (error); 662} 663#undef COPYIN 664#undef COPYOUT 665 666#ifdef COMPAT_FREEBSD32 667/* 668 * PROC_READ(regs, td2, addr); 669 * becomes either: 670 * proc_read_regs(td2, addr); 671 * or 672 * proc_read_regs32(td2, addr); 673 * .. except this is done at runtime. There is an additional 674 * complication in that PROC_WRITE disallows 32 bit consumers 675 * from writing to 64 bit address space targets. 676 */ 677#define PROC_READ(w, t, a) wrap32 ? \ 678 proc_read_ ## w ## 32(t, a) : \ 679 proc_read_ ## w (t, a) 680#define PROC_WRITE(w, t, a) wrap32 ? \ 681 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 682 proc_write_ ## w (t, a) 683#else 684#define PROC_READ(w, t, a) proc_read_ ## w (t, a) 685#define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 686#endif 687 688void 689proc_set_traced(struct proc *p, bool stop) 690{ 691 692 PROC_LOCK_ASSERT(p, MA_OWNED); 693 p->p_flag |= P_TRACED; 694 if (stop) 695 p->p_flag2 |= P2_PTRACE_FSTP; 696 p->p_ptevents = PTRACE_DEFAULT; 697 p->p_oppid = p->p_pptr->p_pid; 698} 699 700int 701kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 702{ 703 struct iovec iov; 704 struct uio uio; 705 struct proc *curp, *p, *pp; 706 struct thread *td2 = NULL, *td3; 707 struct ptrace_io_desc *piod = NULL; 708 struct ptrace_lwpinfo *pl; 709 int error, num, tmp; 710 int proctree_locked = 0; 711 lwpid_t tid = 0, *buf; 712#ifdef COMPAT_FREEBSD32 713 int wrap32 = 0, safe = 0; 714 struct ptrace_io_desc32 *piod32 = NULL; 715 struct ptrace_lwpinfo32 *pl32 = NULL; 716 struct ptrace_lwpinfo plr; 717#endif 718 719 curp = td->td_proc; 720 721 /* Lock proctree before locking the process. */ 722 switch (req) { 723 case PT_TRACE_ME: 724 case PT_ATTACH: 725 case PT_STEP: 726 case PT_CONTINUE: 727 case PT_TO_SCE: 728 case PT_TO_SCX: 729 case PT_SYSCALL: 730 case PT_FOLLOW_FORK: 731 case PT_LWP_EVENTS: 732 case PT_GET_EVENT_MASK: 733 case PT_SET_EVENT_MASK: 734 case PT_DETACH: 735 case PT_GET_SC_ARGS: 736 sx_xlock(&proctree_lock); 737 proctree_locked = 1; 738 break; 739 default: 740 break; 741 } 742 743 if (req == PT_TRACE_ME) { 744 p = td->td_proc; 745 PROC_LOCK(p); 746 } else { 747 if (pid <= PID_MAX) { 748 if ((p = pfind(pid)) == NULL) { 749 if (proctree_locked) 750 sx_xunlock(&proctree_lock); 751 return (ESRCH); 752 } 753 } else { 754 td2 = tdfind(pid, -1); 755 if (td2 == NULL) { 756 if (proctree_locked) 757 sx_xunlock(&proctree_lock); 758 return (ESRCH); 759 } 760 p = td2->td_proc; 761 tid = pid; 762 pid = p->p_pid; 763 } 764 } 765 AUDIT_ARG_PROCESS(p); 766 767 if ((p->p_flag & P_WEXIT) != 0) { 768 error = ESRCH; 769 goto fail; 770 } 771 if ((error = p_cansee(td, p)) != 0) 772 goto fail; 773 774 if ((error = p_candebug(td, p)) != 0) 775 goto fail; 776 777 /* 778 * System processes can't be debugged. 779 */ 780 if ((p->p_flag & P_SYSTEM) != 0) { 781 error = EINVAL; 782 goto fail; 783 } 784 785 if (tid == 0) { 786 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 787 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 788 td2 = p->p_xthread; 789 } else { 790 td2 = FIRST_THREAD_IN_PROC(p); 791 } 792 tid = td2->td_tid; 793 } 794 795#ifdef COMPAT_FREEBSD32 796 /* 797 * Test if we're a 32 bit client and what the target is. 798 * Set the wrap controls accordingly. 799 */ 800 if (SV_CURPROC_FLAG(SV_ILP32)) { 801 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 802 safe = 1; 803 wrap32 = 1; 804 } 805#endif 806 /* 807 * Permissions check 808 */ 809 switch (req) { 810 case PT_TRACE_ME: 811 /* 812 * Always legal, when there is a parent process which 813 * could trace us. Otherwise, reject. 814 */ 815 if ((p->p_flag & P_TRACED) != 0) { 816 error = EBUSY; 817 goto fail; 818 } 819 if (p->p_pptr == initproc) { 820 error = EPERM; 821 goto fail; 822 } 823 break; 824 825 case PT_ATTACH: 826 /* Self */ 827 if (p == td->td_proc) { 828 error = EINVAL; 829 goto fail; 830 } 831 832 /* Already traced */ 833 if (p->p_flag & P_TRACED) { 834 error = EBUSY; 835 goto fail; 836 } 837 838 /* Can't trace an ancestor if you're being traced. */ 839 if (curp->p_flag & P_TRACED) { 840 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 841 if (pp == p) { 842 error = EINVAL; 843 goto fail; 844 } 845 } 846 } 847 848 849 /* OK */ 850 break; 851 852 case PT_CLEARSTEP: 853 /* Allow thread to clear single step for itself */ 854 if (td->td_tid == tid) 855 break; 856 857 /* FALLTHROUGH */ 858 default: 859 /* not being traced... */ 860 if ((p->p_flag & P_TRACED) == 0) { 861 error = EPERM; 862 goto fail; 863 } 864 865 /* not being traced by YOU */ 866 if (p->p_pptr != td->td_proc) { 867 error = EBUSY; 868 goto fail; 869 } 870 871 /* not currently stopped */ 872 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 || 873 p->p_suspcount != p->p_numthreads || 874 (p->p_flag & P_WAITED) == 0) { 875 error = EBUSY; 876 goto fail; 877 } 878 879 if ((p->p_flag & P_STOPPED_TRACE) == 0) { 880 static int count = 0; 881 if (count++ == 0) 882 printf("P_STOPPED_TRACE not set.\n"); 883 } 884 885 /* OK */ 886 break; 887 } 888 889 /* Keep this process around until we finish this request. */ 890 _PHOLD(p); 891 892#ifdef FIX_SSTEP 893 /* 894 * Single step fixup ala procfs 895 */ 896 FIX_SSTEP(td2); 897#endif 898 899 /* 900 * Actually do the requests 901 */ 902 903 td->td_retval[0] = 0; 904 905 switch (req) { 906 case PT_TRACE_ME: 907 /* set my trace flag and "owner" so it can read/write me */ 908 proc_set_traced(p, false); 909 if (p->p_flag & P_PPWAIT) 910 p->p_flag |= P_PPTRACE; 911 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 912 break; 913 914 case PT_ATTACH: 915 /* security check done above */ 916 /* 917 * It would be nice if the tracing relationship was separate 918 * from the parent relationship but that would require 919 * another set of links in the proc struct or for "wait" 920 * to scan the entire proc table. To make life easier, 921 * we just re-parent the process we're trying to trace. 922 * The old parent is remembered so we can put things back 923 * on a "detach". 924 */ 925 proc_set_traced(p, true); 926 if (p->p_pptr != td->td_proc) { 927 proc_reparent(p, td->td_proc); 928 } 929 data = SIGSTOP; 930 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 931 p->p_oppid); 932 goto sendsig; /* in PT_CONTINUE below */ 933 934 case PT_CLEARSTEP: 935 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 936 p->p_pid); 937 error = ptrace_clear_single_step(td2); 938 break; 939 940 case PT_SETSTEP: 941 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 942 p->p_pid); 943 error = ptrace_single_step(td2); 944 break; 945 946 case PT_SUSPEND: 947 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 948 p->p_pid); 949 td2->td_dbgflags |= TDB_SUSPEND; 950 thread_lock(td2); 951 td2->td_flags |= TDF_NEEDSUSPCHK; 952 thread_unlock(td2); 953 break; 954 955 case PT_RESUME: 956 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 957 p->p_pid); 958 td2->td_dbgflags &= ~TDB_SUSPEND; 959 break; 960 961 case PT_FOLLOW_FORK: 962 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 963 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 964 data ? "enabled" : "disabled"); 965 if (data) 966 p->p_ptevents |= PTRACE_FORK; 967 else 968 p->p_ptevents &= ~PTRACE_FORK; 969 break; 970 971 case PT_LWP_EVENTS: 972 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 973 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 974 data ? "enabled" : "disabled"); 975 if (data) 976 p->p_ptevents |= PTRACE_LWP; 977 else 978 p->p_ptevents &= ~PTRACE_LWP; 979 break; 980 981 case PT_GET_EVENT_MASK: 982 if (data != sizeof(p->p_ptevents)) { 983 error = EINVAL; 984 break; 985 } 986 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 987 p->p_ptevents); 988 *(int *)addr = p->p_ptevents; 989 break; 990 991 case PT_SET_EVENT_MASK: 992 if (data != sizeof(p->p_ptevents)) { 993 error = EINVAL; 994 break; 995 } 996 tmp = *(int *)addr; 997 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 998 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 999 error = EINVAL; 1000 break; 1001 } 1002 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1003 p->p_pid, p->p_ptevents, tmp); 1004 p->p_ptevents = tmp; 1005 break; 1006 1007 case PT_GET_SC_ARGS: 1008 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1009 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1010#ifdef COMPAT_FREEBSD32 1011 || (wrap32 && !safe) 1012#endif 1013 ) { 1014 error = EINVAL; 1015 break; 1016 } 1017 bzero(addr, sizeof(td2->td_sa.args)); 1018#ifdef COMPAT_FREEBSD32 1019 if (wrap32) 1020 for (num = 0; num < nitems(td2->td_sa.args); num++) 1021 ((uint32_t *)addr)[num] = (uint32_t) 1022 td2->td_sa.args[num]; 1023 else 1024#endif 1025 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1026 sizeof(register_t)); 1027 break; 1028 1029 case PT_STEP: 1030 case PT_CONTINUE: 1031 case PT_TO_SCE: 1032 case PT_TO_SCX: 1033 case PT_SYSCALL: 1034 case PT_DETACH: 1035 /* Zero means do not send any signal */ 1036 if (data < 0 || data > _SIG_MAXSIG) { 1037 error = EINVAL; 1038 break; 1039 } 1040 1041 switch (req) { 1042 case PT_STEP: 1043 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1044 td2->td_tid, p->p_pid, data); 1045 error = ptrace_single_step(td2); 1046 if (error) 1047 goto out; 1048 break; 1049 case PT_CONTINUE: 1050 case PT_TO_SCE: 1051 case PT_TO_SCX: 1052 case PT_SYSCALL: 1053 if (addr != (void *)1) { 1054 error = ptrace_set_pc(td2, 1055 (u_long)(uintfptr_t)addr); 1056 if (error) 1057 goto out; 1058 } 1059 switch (req) { 1060 case PT_TO_SCE: 1061 p->p_ptevents |= PTRACE_SCE; 1062 CTR4(KTR_PTRACE, 1063 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1064 p->p_pid, p->p_ptevents, 1065 (u_long)(uintfptr_t)addr, data); 1066 break; 1067 case PT_TO_SCX: 1068 p->p_ptevents |= PTRACE_SCX; 1069 CTR4(KTR_PTRACE, 1070 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1071 p->p_pid, p->p_ptevents, 1072 (u_long)(uintfptr_t)addr, data); 1073 break; 1074 case PT_SYSCALL: 1075 p->p_ptevents |= PTRACE_SYSCALL; 1076 CTR4(KTR_PTRACE, 1077 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1078 p->p_pid, p->p_ptevents, 1079 (u_long)(uintfptr_t)addr, data); 1080 break; 1081 case PT_CONTINUE: 1082 CTR3(KTR_PTRACE, 1083 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1084 p->p_pid, (u_long)(uintfptr_t)addr, data); 1085 break; 1086 } 1087 break; 1088 case PT_DETACH: 1089 /* 1090 * Reset the process parent. 1091 * 1092 * NB: This clears P_TRACED before reparenting 1093 * a detached process back to its original 1094 * parent. Otherwise the debugee will be set 1095 * as an orphan of the debugger. 1096 */ 1097 p->p_flag &= ~(P_TRACED | P_WAITED); 1098 if (p->p_oppid != p->p_pptr->p_pid) { 1099 PROC_LOCK(p->p_pptr); 1100 sigqueue_take(p->p_ksi); 1101 PROC_UNLOCK(p->p_pptr); 1102 1103 pp = proc_realparent(p); 1104 proc_reparent(p, pp); 1105 if (pp == initproc) 1106 p->p_sigparent = SIGCHLD; 1107 CTR3(KTR_PTRACE, 1108 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1109 p->p_pid, pp->p_pid, data); 1110 } else 1111 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1112 p->p_pid, data); 1113 p->p_oppid = 0; 1114 p->p_ptevents = 0; 1115 FOREACH_THREAD_IN_PROC(p, td3) { 1116 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1117 sigqueue_delete(&td3->td_sigqueue, 1118 SIGSTOP); 1119 } 1120 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP); 1121 } 1122 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1123 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1124 p->p_flag2 &= ~P2_PTRACE_FSTP; 1125 } 1126 1127 /* should we send SIGCHLD? */ 1128 /* childproc_continued(p); */ 1129 break; 1130 } 1131 1132 sendsig: 1133 /* 1134 * Clear the pending event for the thread that just 1135 * reported its event (p_xthread). This may not be 1136 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1137 * the debugger is resuming a different thread. 1138 */ 1139 td2 = p->p_xthread; 1140 if (proctree_locked) { 1141 sx_xunlock(&proctree_lock); 1142 proctree_locked = 0; 1143 } 1144 p->p_xsig = data; 1145 p->p_xthread = NULL; 1146 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) { 1147 /* deliver or queue signal */ 1148 td2->td_dbgflags &= ~TDB_XSIG; 1149 td2->td_xsig = data; 1150 1151 /* 1152 * P_WKILLED is insurance that a PT_KILL/SIGKILL always 1153 * works immediately, even if another thread is 1154 * unsuspended first and attempts to handle a different 1155 * signal or if the POSIX.1b style signal queue cannot 1156 * accommodate any new signals. 1157 */ 1158 if (data == SIGKILL) 1159 p->p_flag |= P_WKILLED; 1160 1161 if (req == PT_DETACH) { 1162 FOREACH_THREAD_IN_PROC(p, td3) 1163 td3->td_dbgflags &= ~TDB_SUSPEND; 1164 } 1165 /* 1166 * unsuspend all threads, to not let a thread run, 1167 * you should use PT_SUSPEND to suspend it before 1168 * continuing process. 1169 */ 1170 PROC_SLOCK(p); 1171 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED); 1172 thread_unsuspend(p); 1173 PROC_SUNLOCK(p); 1174 if (req == PT_ATTACH) 1175 kern_psignal(p, data); 1176 } else { 1177 if (data) 1178 kern_psignal(p, data); 1179 } 1180 break; 1181 1182 case PT_WRITE_I: 1183 case PT_WRITE_D: 1184 td2->td_dbgflags |= TDB_USERWR; 1185 PROC_UNLOCK(p); 1186 error = 0; 1187 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1188 sizeof(int)) != sizeof(int)) 1189 error = ENOMEM; 1190 else 1191 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1192 p->p_pid, addr, data); 1193 PROC_LOCK(p); 1194 break; 1195 1196 case PT_READ_I: 1197 case PT_READ_D: 1198 PROC_UNLOCK(p); 1199 error = tmp = 0; 1200 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1201 sizeof(int)) != sizeof(int)) 1202 error = ENOMEM; 1203 else 1204 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1205 p->p_pid, addr, tmp); 1206 td->td_retval[0] = tmp; 1207 PROC_LOCK(p); 1208 break; 1209 1210 case PT_IO: 1211#ifdef COMPAT_FREEBSD32 1212 if (wrap32) { 1213 piod32 = addr; 1214 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1215 iov.iov_len = piod32->piod_len; 1216 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1217 uio.uio_resid = piod32->piod_len; 1218 } else 1219#endif 1220 { 1221 piod = addr; 1222 iov.iov_base = piod->piod_addr; 1223 iov.iov_len = piod->piod_len; 1224 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1225 uio.uio_resid = piod->piod_len; 1226 } 1227 uio.uio_iov = &iov; 1228 uio.uio_iovcnt = 1; 1229 uio.uio_segflg = UIO_USERSPACE; 1230 uio.uio_td = td; 1231#ifdef COMPAT_FREEBSD32 1232 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1233#else 1234 tmp = piod->piod_op; 1235#endif 1236 switch (tmp) { 1237 case PIOD_READ_D: 1238 case PIOD_READ_I: 1239 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1240 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1241 uio.uio_rw = UIO_READ; 1242 break; 1243 case PIOD_WRITE_D: 1244 case PIOD_WRITE_I: 1245 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1246 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1247 td2->td_dbgflags |= TDB_USERWR; 1248 uio.uio_rw = UIO_WRITE; 1249 break; 1250 default: 1251 error = EINVAL; 1252 goto out; 1253 } 1254 PROC_UNLOCK(p); 1255 error = proc_rwmem(p, &uio); 1256#ifdef COMPAT_FREEBSD32 1257 if (wrap32) 1258 piod32->piod_len -= uio.uio_resid; 1259 else 1260#endif 1261 piod->piod_len -= uio.uio_resid; 1262 PROC_LOCK(p); 1263 break; 1264 1265 case PT_KILL: 1266 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1267 data = SIGKILL; 1268 goto sendsig; /* in PT_CONTINUE above */ 1269 1270 case PT_SETREGS: 1271 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1272 p->p_pid); 1273 td2->td_dbgflags |= TDB_USERWR; 1274 error = PROC_WRITE(regs, td2, addr); 1275 break; 1276 1277 case PT_GETREGS: 1278 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1279 p->p_pid); 1280 error = PROC_READ(regs, td2, addr); 1281 break; 1282 1283 case PT_SETFPREGS: 1284 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1285 p->p_pid); 1286 td2->td_dbgflags |= TDB_USERWR; 1287 error = PROC_WRITE(fpregs, td2, addr); 1288 break; 1289 1290 case PT_GETFPREGS: 1291 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1292 p->p_pid); 1293 error = PROC_READ(fpregs, td2, addr); 1294 break; 1295 1296 case PT_SETDBREGS: 1297 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1298 p->p_pid); 1299 td2->td_dbgflags |= TDB_USERWR; 1300 error = PROC_WRITE(dbregs, td2, addr); 1301 break; 1302 1303 case PT_GETDBREGS: 1304 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1305 p->p_pid); 1306 error = PROC_READ(dbregs, td2, addr); 1307 break; 1308 1309 case PT_LWPINFO: 1310 if (data <= 0 || 1311#ifdef COMPAT_FREEBSD32 1312 (!wrap32 && data > sizeof(*pl)) || 1313 (wrap32 && data > sizeof(*pl32))) { 1314#else 1315 data > sizeof(*pl)) { 1316#endif 1317 error = EINVAL; 1318 break; 1319 } 1320#ifdef COMPAT_FREEBSD32 1321 if (wrap32) { 1322 pl = &plr; 1323 pl32 = addr; 1324 } else 1325#endif 1326 pl = addr; 1327 bzero(pl, sizeof(*pl)); 1328 pl->pl_lwpid = td2->td_tid; 1329 pl->pl_event = PL_EVENT_NONE; 1330 pl->pl_flags = 0; 1331 if (td2->td_dbgflags & TDB_XSIG) { 1332 pl->pl_event = PL_EVENT_SIGNAL; 1333 if (td2->td_si.si_signo != 0 && 1334#ifdef COMPAT_FREEBSD32 1335 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1336 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1337 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1338 pl_siginfo) + sizeof(struct siginfo32))) 1339#else 1340 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1341 + sizeof(pl->pl_siginfo) 1342#endif 1343 ){ 1344 pl->pl_flags |= PL_FLAG_SI; 1345 pl->pl_siginfo = td2->td_si; 1346 } 1347 } 1348 if (td2->td_dbgflags & TDB_SCE) 1349 pl->pl_flags |= PL_FLAG_SCE; 1350 else if (td2->td_dbgflags & TDB_SCX) 1351 pl->pl_flags |= PL_FLAG_SCX; 1352 if (td2->td_dbgflags & TDB_EXEC) 1353 pl->pl_flags |= PL_FLAG_EXEC; 1354 if (td2->td_dbgflags & TDB_FORK) { 1355 pl->pl_flags |= PL_FLAG_FORKED; 1356 pl->pl_child_pid = td2->td_dbg_forked; 1357 if (td2->td_dbgflags & TDB_VFORK) 1358 pl->pl_flags |= PL_FLAG_VFORKED; 1359 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1360 TDB_VFORK) 1361 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1362 if (td2->td_dbgflags & TDB_CHILD) 1363 pl->pl_flags |= PL_FLAG_CHILD; 1364 if (td2->td_dbgflags & TDB_BORN) 1365 pl->pl_flags |= PL_FLAG_BORN; 1366 if (td2->td_dbgflags & TDB_EXIT) 1367 pl->pl_flags |= PL_FLAG_EXITED; 1368 pl->pl_sigmask = td2->td_sigmask; 1369 pl->pl_siglist = td2->td_siglist; 1370 strcpy(pl->pl_tdname, td2->td_name); 1371 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1372 pl->pl_syscall_code = td2->td_sa.code; 1373 pl->pl_syscall_narg = td2->td_sa.narg; 1374 } else { 1375 pl->pl_syscall_code = 0; 1376 pl->pl_syscall_narg = 0; 1377 } 1378#ifdef COMPAT_FREEBSD32 1379 if (wrap32) 1380 ptrace_lwpinfo_to32(pl, pl32); 1381#endif 1382 CTR6(KTR_PTRACE, 1383 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1384 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1385 pl->pl_child_pid, pl->pl_syscall_code); 1386 break; 1387 1388 case PT_GETNUMLWPS: 1389 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1390 p->p_numthreads); 1391 td->td_retval[0] = p->p_numthreads; 1392 break; 1393 1394 case PT_GETLWPLIST: 1395 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1396 p->p_pid, data, p->p_numthreads); 1397 if (data <= 0) { 1398 error = EINVAL; 1399 break; 1400 } 1401 num = imin(p->p_numthreads, data); 1402 PROC_UNLOCK(p); 1403 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1404 tmp = 0; 1405 PROC_LOCK(p); 1406 FOREACH_THREAD_IN_PROC(p, td2) { 1407 if (tmp >= num) 1408 break; 1409 buf[tmp++] = td2->td_tid; 1410 } 1411 PROC_UNLOCK(p); 1412 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1413 free(buf, M_TEMP); 1414 if (!error) 1415 td->td_retval[0] = tmp; 1416 PROC_LOCK(p); 1417 break; 1418 1419 case PT_VM_TIMESTAMP: 1420 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1421 p->p_pid, p->p_vmspace->vm_map.timestamp); 1422 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1423 break; 1424 1425 case PT_VM_ENTRY: 1426 PROC_UNLOCK(p); 1427#ifdef COMPAT_FREEBSD32 1428 if (wrap32) 1429 error = ptrace_vm_entry32(td, p, addr); 1430 else 1431#endif 1432 error = ptrace_vm_entry(td, p, addr); 1433 PROC_LOCK(p); 1434 break; 1435 1436 default: 1437#ifdef __HAVE_PTRACE_MACHDEP 1438 if (req >= PT_FIRSTMACH) { 1439 PROC_UNLOCK(p); 1440 error = cpu_ptrace(td2, req, addr, data); 1441 PROC_LOCK(p); 1442 } else 1443#endif 1444 /* Unknown request. */ 1445 error = EINVAL; 1446 break; 1447 } 1448 1449out: 1450 /* Drop our hold on this process now that the request has completed. */ 1451 _PRELE(p); 1452fail: 1453 PROC_UNLOCK(p); 1454 if (proctree_locked) 1455 sx_xunlock(&proctree_lock); 1456 return (error); 1457} 1458#undef PROC_READ 1459#undef PROC_WRITE 1460 1461/* 1462 * Stop a process because of a debugging event; 1463 * stay stopped until p->p_step is cleared 1464 * (cleared by PIOCCONT in procfs). 1465 */ 1466void 1467stopevent(struct proc *p, unsigned int event, unsigned int val) 1468{ 1469 1470 PROC_LOCK_ASSERT(p, MA_OWNED); 1471 p->p_step = 1; 1472 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1473 val); 1474 do { 1475 if (event != S_EXIT) 1476 p->p_xsig = val; 1477 p->p_xthread = NULL; 1478 p->p_stype = event; /* Which event caused the stop? */ 1479 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1480 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1481 } while (p->p_step); 1482} 1483