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/10/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/priv.h> 45#include <sys/proc.h> 46#include <sys/vnode.h> 47#include <sys/ptrace.h> 48#include <sys/rwlock.h> 49#include <sys/sx.h> 50#include <sys/malloc.h> 51#include <sys/signalvar.h> 52 53#include <machine/reg.h> 54 55#include <security/audit/audit.h> 56 57#include <vm/vm.h> 58#include <vm/pmap.h> 59#include <vm/vm_extern.h> 60#include <vm/vm_map.h> 61#include <vm/vm_kern.h> 62#include <vm/vm_object.h> 63#include <vm/vm_page.h> 64#include <vm/vm_param.h> 65 66#ifdef COMPAT_FREEBSD32 67#include <sys/procfs.h> 68#include <compat/freebsd32/freebsd32_signal.h> 69 70struct ptrace_io_desc32 { 71 int piod_op; 72 uint32_t piod_offs; 73 uint32_t piod_addr; 74 uint32_t piod_len; 75}; 76 77struct ptrace_vm_entry32 { 78 int pve_entry; 79 int pve_timestamp; 80 uint32_t pve_start; 81 uint32_t pve_end; 82 uint32_t pve_offset; 83 u_int pve_prot; 84 u_int pve_pathlen; 85 int32_t pve_fileid; 86 u_int pve_fsid; 87 uint32_t pve_path; 88}; 89 90struct ptrace_lwpinfo32 { 91 lwpid_t pl_lwpid; /* LWP described. */ 92 int pl_event; /* Event that stopped the LWP. */ 93 int pl_flags; /* LWP flags. */ 94 sigset_t pl_sigmask; /* LWP signal mask */ 95 sigset_t pl_siglist; /* LWP pending signal */ 96 struct siginfo32 pl_siginfo; /* siginfo for signal */ 97 char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */ 98 pid_t pl_child_pid; /* New child pid */ 99 u_int pl_syscall_code; 100 u_int pl_syscall_narg; 101}; 102 103#endif 104 105/* 106 * Functions implemented using PROC_ACTION(): 107 * 108 * proc_read_regs(proc, regs) 109 * Get the current user-visible register set from the process 110 * and copy it into the regs structure (<machine/reg.h>). 111 * The process is stopped at the time read_regs is called. 112 * 113 * proc_write_regs(proc, regs) 114 * Update the current register set from the passed in regs 115 * structure. Take care to avoid clobbering special CPU 116 * registers or privileged bits in the PSL. 117 * Depending on the architecture this may have fix-up work to do, 118 * especially if the IAR or PCW are modified. 119 * The process is stopped at the time write_regs is called. 120 * 121 * proc_read_fpregs, proc_write_fpregs 122 * deal with the floating point register set, otherwise as above. 123 * 124 * proc_read_dbregs, proc_write_dbregs 125 * deal with the processor debug register set, otherwise as above. 126 * 127 * proc_sstep(proc) 128 * Arrange for the process to trap after executing a single instruction. 129 */ 130 131#define PROC_ACTION(action) do { \ 132 int error; \ 133 \ 134 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 135 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 136 error = EIO; \ 137 else \ 138 error = (action); \ 139 return (error); \ 140} while(0) 141 142int 143proc_read_regs(struct thread *td, struct reg *regs) 144{ 145 146 PROC_ACTION(fill_regs(td, regs)); 147} 148 149int 150proc_write_regs(struct thread *td, struct reg *regs) 151{ 152 153 PROC_ACTION(set_regs(td, regs)); 154} 155 156int 157proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 158{ 159 160 PROC_ACTION(fill_dbregs(td, dbregs)); 161} 162 163int 164proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 165{ 166 167 PROC_ACTION(set_dbregs(td, dbregs)); 168} 169 170/* 171 * Ptrace doesn't support fpregs at all, and there are no security holes 172 * or translations for fpregs, so we can just copy them. 173 */ 174int 175proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 176{ 177 178 PROC_ACTION(fill_fpregs(td, fpregs)); 179} 180 181int 182proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 183{ 184 185 PROC_ACTION(set_fpregs(td, fpregs)); 186} 187 188#ifdef COMPAT_FREEBSD32 189/* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 190int 191proc_read_regs32(struct thread *td, struct reg32 *regs32) 192{ 193 194 PROC_ACTION(fill_regs32(td, regs32)); 195} 196 197int 198proc_write_regs32(struct thread *td, struct reg32 *regs32) 199{ 200 201 PROC_ACTION(set_regs32(td, regs32)); 202} 203 204int 205proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 206{ 207 208 PROC_ACTION(fill_dbregs32(td, dbregs32)); 209} 210 211int 212proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 213{ 214 215 PROC_ACTION(set_dbregs32(td, dbregs32)); 216} 217 218int 219proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 220{ 221 222 PROC_ACTION(fill_fpregs32(td, fpregs32)); 223} 224 225int 226proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 227{ 228 229 PROC_ACTION(set_fpregs32(td, fpregs32)); 230} 231#endif 232 233int 234proc_sstep(struct thread *td) 235{ 236 237 PROC_ACTION(ptrace_single_step(td)); 238} 239 240int 241proc_rwmem(struct proc *p, struct uio *uio) 242{ 243 vm_map_t map; 244 vm_offset_t pageno; /* page number */ 245 vm_prot_t reqprot; 246 int error, fault_flags, page_offset, writing; 247 248 /* 249 * Assert that someone has locked this vmspace. (Should be 250 * curthread but we can't assert that.) This keeps the process 251 * from exiting out from under us until this operation completes. 252 */ 253 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__, 254 p, p->p_pid)); 255 256 /* 257 * The map we want... 258 */ 259 map = &p->p_vmspace->vm_map; 260 261 /* 262 * If we are writing, then we request vm_fault() to create a private 263 * copy of each page. Since these copies will not be writeable by the 264 * process, we must explicity request that they be dirtied. 265 */ 266 writing = uio->uio_rw == UIO_WRITE; 267 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 268 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 269 270 /* 271 * Only map in one page at a time. We don't have to, but it 272 * makes things easier. This way is trivial - right? 273 */ 274 do { 275 vm_offset_t uva; 276 u_int len; 277 vm_page_t m; 278 279 uva = (vm_offset_t)uio->uio_offset; 280 281 /* 282 * Get the page number of this segment. 283 */ 284 pageno = trunc_page(uva); 285 page_offset = uva - pageno; 286 287 /* 288 * How many bytes to copy 289 */ 290 len = min(PAGE_SIZE - page_offset, uio->uio_resid); 291 292 /* 293 * Fault and hold the page on behalf of the process. 294 */ 295 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m); 296 if (error != KERN_SUCCESS) { 297 if (error == KERN_RESOURCE_SHORTAGE) 298 error = ENOMEM; 299 else 300 error = EFAULT; 301 break; 302 } 303 304 /* 305 * Now do the i/o move. 306 */ 307 error = uiomove_fromphys(&m, page_offset, len, uio); 308 309 /* Make the I-cache coherent for breakpoints. */ 310 if (writing && error == 0) { 311 vm_map_lock_read(map); 312 if (vm_map_check_protection(map, pageno, pageno + 313 PAGE_SIZE, VM_PROT_EXECUTE)) 314 vm_sync_icache(map, uva, len); 315 vm_map_unlock_read(map); 316 } 317 318 /* 319 * Release the page. 320 */ 321 vm_page_lock(m); 322 vm_page_unhold(m); 323 vm_page_unlock(m); 324 325 } while (error == 0 && uio->uio_resid > 0); 326 327 return (error); 328} 329 330static int 331ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 332{ 333 struct vattr vattr; 334 vm_map_t map; 335 vm_map_entry_t entry; 336 vm_object_t obj, tobj, lobj; 337 struct vmspace *vm; 338 struct vnode *vp; 339 char *freepath, *fullpath; 340 u_int pathlen; 341 int error, index; 342 343 error = 0; 344 obj = NULL; 345 346 vm = vmspace_acquire_ref(p); 347 map = &vm->vm_map; 348 vm_map_lock_read(map); 349 350 do { 351 entry = map->header.next; 352 index = 0; 353 while (index < pve->pve_entry && entry != &map->header) { 354 entry = entry->next; 355 index++; 356 } 357 if (index != pve->pve_entry) { 358 error = EINVAL; 359 break; 360 } 361 while (entry != &map->header && 362 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 363 entry = entry->next; 364 index++; 365 } 366 if (entry == &map->header) { 367 error = ENOENT; 368 break; 369 } 370 371 /* We got an entry. */ 372 pve->pve_entry = index + 1; 373 pve->pve_timestamp = map->timestamp; 374 pve->pve_start = entry->start; 375 pve->pve_end = entry->end - 1; 376 pve->pve_offset = entry->offset; 377 pve->pve_prot = entry->protection; 378 379 /* Backing object's path needed? */ 380 if (pve->pve_pathlen == 0) 381 break; 382 383 pathlen = pve->pve_pathlen; 384 pve->pve_pathlen = 0; 385 386 obj = entry->object.vm_object; 387 if (obj != NULL) 388 VM_OBJECT_RLOCK(obj); 389 } while (0); 390 391 vm_map_unlock_read(map); 392 393 pve->pve_fsid = VNOVAL; 394 pve->pve_fileid = VNOVAL; 395 396 if (error == 0 && obj != NULL) { 397 lobj = obj; 398 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 399 if (tobj != obj) 400 VM_OBJECT_RLOCK(tobj); 401 if (lobj != obj) 402 VM_OBJECT_RUNLOCK(lobj); 403 lobj = tobj; 404 pve->pve_offset += tobj->backing_object_offset; 405 } 406 vp = vm_object_vnode(lobj); 407 if (vp != NULL) 408 vref(vp); 409 if (lobj != obj) 410 VM_OBJECT_RUNLOCK(lobj); 411 VM_OBJECT_RUNLOCK(obj); 412 413 if (vp != NULL) { 414 freepath = NULL; 415 fullpath = NULL; 416 vn_fullpath(td, vp, &fullpath, &freepath); 417 vn_lock(vp, LK_SHARED | LK_RETRY); 418 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 419 pve->pve_fileid = vattr.va_fileid; 420 pve->pve_fsid = vattr.va_fsid; 421 } 422 vput(vp); 423 424 if (fullpath != NULL) { 425 pve->pve_pathlen = strlen(fullpath) + 1; 426 if (pve->pve_pathlen <= pathlen) { 427 error = copyout(fullpath, pve->pve_path, 428 pve->pve_pathlen); 429 } else 430 error = ENAMETOOLONG; 431 } 432 if (freepath != NULL) 433 free(freepath, M_TEMP); 434 } 435 } 436 vmspace_free(vm); 437 if (error == 0) 438 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 439 p->p_pid, pve->pve_entry, pve->pve_start); 440 441 return (error); 442} 443 444#ifdef COMPAT_FREEBSD32 445static int 446ptrace_vm_entry32(struct thread *td, struct proc *p, 447 struct ptrace_vm_entry32 *pve32) 448{ 449 struct ptrace_vm_entry pve; 450 int error; 451 452 pve.pve_entry = pve32->pve_entry; 453 pve.pve_pathlen = pve32->pve_pathlen; 454 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 455 456 error = ptrace_vm_entry(td, p, &pve); 457 if (error == 0) { 458 pve32->pve_entry = pve.pve_entry; 459 pve32->pve_timestamp = pve.pve_timestamp; 460 pve32->pve_start = pve.pve_start; 461 pve32->pve_end = pve.pve_end; 462 pve32->pve_offset = pve.pve_offset; 463 pve32->pve_prot = pve.pve_prot; 464 pve32->pve_fileid = pve.pve_fileid; 465 pve32->pve_fsid = pve.pve_fsid; 466 } 467 468 pve32->pve_pathlen = pve.pve_pathlen; 469 return (error); 470} 471 472static void 473ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 474 struct ptrace_lwpinfo32 *pl32) 475{ 476 477 bzero(pl32, sizeof(*pl32)); 478 pl32->pl_lwpid = pl->pl_lwpid; 479 pl32->pl_event = pl->pl_event; 480 pl32->pl_flags = pl->pl_flags; 481 pl32->pl_sigmask = pl->pl_sigmask; 482 pl32->pl_siglist = pl->pl_siglist; 483 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 484 strcpy(pl32->pl_tdname, pl->pl_tdname); 485 pl32->pl_child_pid = pl->pl_child_pid; 486 pl32->pl_syscall_code = pl->pl_syscall_code; 487 pl32->pl_syscall_narg = pl->pl_syscall_narg; 488} 489#endif /* COMPAT_FREEBSD32 */ 490 491/* 492 * Process debugging system call. 493 */ 494#ifndef _SYS_SYSPROTO_H_ 495struct ptrace_args { 496 int req; 497 pid_t pid; 498 caddr_t addr; 499 int data; 500}; 501#endif 502 503#ifdef COMPAT_FREEBSD32 504/* 505 * This CPP subterfuge is to try and reduce the number of ifdefs in 506 * the body of the code. 507 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 508 * becomes either: 509 * copyin(uap->addr, &r.reg, sizeof r.reg); 510 * or 511 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 512 * .. except this is done at runtime. 513 */ 514#define COPYIN(u, k, s) wrap32 ? \ 515 copyin(u, k ## 32, s ## 32) : \ 516 copyin(u, k, s) 517#define COPYOUT(k, u, s) wrap32 ? \ 518 copyout(k ## 32, u, s ## 32) : \ 519 copyout(k, u, s) 520#else 521#define COPYIN(u, k, s) copyin(u, k, s) 522#define COPYOUT(k, u, s) copyout(k, u, s) 523#endif 524int 525sys_ptrace(struct thread *td, struct ptrace_args *uap) 526{ 527 /* 528 * XXX this obfuscation is to reduce stack usage, but the register 529 * structs may be too large to put on the stack anyway. 530 */ 531 union { 532 struct ptrace_io_desc piod; 533 struct ptrace_lwpinfo pl; 534 struct ptrace_vm_entry pve; 535 struct dbreg dbreg; 536 struct fpreg fpreg; 537 struct reg reg; 538#ifdef COMPAT_FREEBSD32 539 struct dbreg32 dbreg32; 540 struct fpreg32 fpreg32; 541 struct reg32 reg32; 542 struct ptrace_io_desc32 piod32; 543 struct ptrace_lwpinfo32 pl32; 544 struct ptrace_vm_entry32 pve32; 545#endif 546 int ptevents; 547 } r; 548 void *addr; 549 int error = 0; 550#ifdef COMPAT_FREEBSD32 551 int wrap32 = 0; 552 553 if (SV_CURPROC_FLAG(SV_ILP32)) 554 wrap32 = 1; 555#endif 556 AUDIT_ARG_PID(uap->pid); 557 AUDIT_ARG_CMD(uap->req); 558 AUDIT_ARG_VALUE(uap->data); 559 addr = &r; 560 switch (uap->req) { 561 case PT_GET_EVENT_MASK: 562 case PT_GETREGS: 563 case PT_GETFPREGS: 564 case PT_GETDBREGS: 565 case PT_LWPINFO: 566 break; 567 case PT_SETREGS: 568 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 569 break; 570 case PT_SETFPREGS: 571 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 572 break; 573 case PT_SETDBREGS: 574 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 575 break; 576 case PT_SET_EVENT_MASK: 577 if (uap->data != sizeof(r.ptevents)) 578 error = EINVAL; 579 else 580 error = copyin(uap->addr, &r.ptevents, uap->data); 581 break; 582 case PT_IO: 583 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 584 break; 585 case PT_VM_ENTRY: 586 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 587 break; 588 default: 589 addr = uap->addr; 590 break; 591 } 592 if (error) 593 return (error); 594 595 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 596 if (error) 597 return (error); 598 599 switch (uap->req) { 600 case PT_VM_ENTRY: 601 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 602 break; 603 case PT_IO: 604 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 605 break; 606 case PT_GETREGS: 607 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 608 break; 609 case PT_GETFPREGS: 610 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 611 break; 612 case PT_GETDBREGS: 613 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 614 break; 615 case PT_GET_EVENT_MASK: 616 /* NB: The size in uap->data is validated in kern_ptrace(). */ 617 error = copyout(&r.ptevents, uap->addr, uap->data); 618 break; 619 case PT_LWPINFO: 620 /* NB: The size in uap->data is validated in kern_ptrace(). */ 621 error = copyout(&r.pl, uap->addr, uap->data); 622 break; 623 } 624 625 return (error); 626} 627#undef COPYIN 628#undef COPYOUT 629 630#ifdef COMPAT_FREEBSD32 631/* 632 * PROC_READ(regs, td2, addr); 633 * becomes either: 634 * proc_read_regs(td2, addr); 635 * or 636 * proc_read_regs32(td2, addr); 637 * .. except this is done at runtime. There is an additional 638 * complication in that PROC_WRITE disallows 32 bit consumers 639 * from writing to 64 bit address space targets. 640 */ 641#define PROC_READ(w, t, a) wrap32 ? \ 642 proc_read_ ## w ## 32(t, a) : \ 643 proc_read_ ## w (t, a) 644#define PROC_WRITE(w, t, a) wrap32 ? \ 645 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 646 proc_write_ ## w (t, a) 647#else 648#define PROC_READ(w, t, a) proc_read_ ## w (t, a) 649#define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 650#endif 651 652void 653proc_set_traced(struct proc *p, bool stop) 654{ 655 656 PROC_LOCK_ASSERT(p, MA_OWNED); 657 p->p_flag |= P_TRACED; 658 if (stop) 659 p->p_flag2 |= P2_PTRACE_FSTP; 660 p->p_ptevents = PTRACE_DEFAULT; 661 p->p_oppid = p->p_pptr->p_pid; 662} 663 664int 665kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 666{ 667 struct iovec iov; 668 struct uio uio; 669 struct proc *curp, *p, *pp; 670 struct thread *td2 = NULL, *td3; 671 struct ptrace_io_desc *piod = NULL; 672 struct ptrace_lwpinfo *pl; 673 int error, write, tmp, num; 674 int proctree_locked = 0; 675 lwpid_t tid = 0, *buf; 676#ifdef COMPAT_FREEBSD32 677 int wrap32 = 0, safe = 0; 678 struct ptrace_io_desc32 *piod32 = NULL; 679 struct ptrace_lwpinfo32 *pl32 = NULL; 680 struct ptrace_lwpinfo plr; 681#endif 682 683 curp = td->td_proc; 684 685 /* Lock proctree before locking the process. */ 686 switch (req) { 687 case PT_TRACE_ME: 688 case PT_ATTACH: 689 case PT_STEP: 690 case PT_CONTINUE: 691 case PT_TO_SCE: 692 case PT_TO_SCX: 693 case PT_SYSCALL: 694 case PT_FOLLOW_FORK: 695 case PT_LWP_EVENTS: 696 case PT_GET_EVENT_MASK: 697 case PT_SET_EVENT_MASK: 698 case PT_DETACH: 699 sx_xlock(&proctree_lock); 700 proctree_locked = 1; 701 break; 702 default: 703 break; 704 } 705 706 write = 0; 707 if (req == PT_TRACE_ME) { 708 p = td->td_proc; 709 PROC_LOCK(p); 710 } else { 711 if (pid <= PID_MAX) { 712 if ((p = pfind(pid)) == NULL) { 713 if (proctree_locked) 714 sx_xunlock(&proctree_lock); 715 return (ESRCH); 716 } 717 } else { 718 td2 = tdfind(pid, -1); 719 if (td2 == NULL) { 720 if (proctree_locked) 721 sx_xunlock(&proctree_lock); 722 return (ESRCH); 723 } 724 p = td2->td_proc; 725 tid = pid; 726 pid = p->p_pid; 727 } 728 } 729 AUDIT_ARG_PROCESS(p); 730 731 if ((p->p_flag & P_WEXIT) != 0) { 732 error = ESRCH; 733 goto fail; 734 } 735 if ((error = p_cansee(td, p)) != 0) 736 goto fail; 737 738 if ((error = p_candebug(td, p)) != 0) 739 goto fail; 740 741 /* 742 * System processes can't be debugged. 743 */ 744 if ((p->p_flag & P_SYSTEM) != 0) { 745 error = EINVAL; 746 goto fail; 747 } 748 749 if (tid == 0) { 750 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 751 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 752 td2 = p->p_xthread; 753 } else { 754 td2 = FIRST_THREAD_IN_PROC(p); 755 } 756 tid = td2->td_tid; 757 } 758 759#ifdef COMPAT_FREEBSD32 760 /* 761 * Test if we're a 32 bit client and what the target is. 762 * Set the wrap controls accordingly. 763 */ 764 if (SV_CURPROC_FLAG(SV_ILP32)) { 765 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 766 safe = 1; 767 wrap32 = 1; 768 } 769#endif 770 /* 771 * Permissions check 772 */ 773 switch (req) { 774 case PT_TRACE_ME: 775 /* 776 * Always legal, when there is a parent process which 777 * could trace us. Otherwise, reject. 778 */ 779 if ((p->p_flag & P_TRACED) != 0) { 780 error = EBUSY; 781 goto fail; 782 } 783 if (p->p_pptr == initproc) { 784 error = EPERM; 785 goto fail; 786 } 787 break; 788 789 case PT_ATTACH: 790 /* Self */ 791 if (p == td->td_proc) { 792 error = EINVAL; 793 goto fail; 794 } 795 796 /* Already traced */ 797 if (p->p_flag & P_TRACED) { 798 error = EBUSY; 799 goto fail; 800 } 801 802 /* Can't trace an ancestor if you're being traced. */ 803 if (curp->p_flag & P_TRACED) { 804 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 805 if (pp == p) { 806 error = EINVAL; 807 goto fail; 808 } 809 } 810 } 811 812 813 /* OK */ 814 break; 815 816 case PT_CLEARSTEP: 817 /* Allow thread to clear single step for itself */ 818 if (td->td_tid == tid) 819 break; 820 821 /* FALLTHROUGH */ 822 default: 823 /* not being traced... */ 824 if ((p->p_flag & P_TRACED) == 0) { 825 error = EPERM; 826 goto fail; 827 } 828 829 /* not being traced by YOU */ 830 if (p->p_pptr != td->td_proc) { 831 error = EBUSY; 832 goto fail; 833 } 834 835 /* not currently stopped */ 836 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 || 837 p->p_suspcount != p->p_numthreads || 838 (p->p_flag & P_WAITED) == 0) { 839 error = EBUSY; 840 goto fail; 841 } 842 843 if ((p->p_flag & P_STOPPED_TRACE) == 0) { 844 static int count = 0; 845 if (count++ == 0) 846 printf("P_STOPPED_TRACE not set.\n"); 847 } 848 849 /* OK */ 850 break; 851 } 852 853 /* Keep this process around until we finish this request. */ 854 _PHOLD(p); 855 856#ifdef FIX_SSTEP 857 /* 858 * Single step fixup ala procfs 859 */ 860 FIX_SSTEP(td2); 861#endif 862 863 /* 864 * Actually do the requests 865 */ 866 867 td->td_retval[0] = 0; 868 869 switch (req) { 870 case PT_TRACE_ME: 871 /* set my trace flag and "owner" so it can read/write me */ 872 proc_set_traced(p, false); 873 if (p->p_flag & P_PPWAIT) 874 p->p_flag |= P_PPTRACE; 875 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 876 break; 877 878 case PT_ATTACH: 879 /* security check done above */ 880 /* 881 * It would be nice if the tracing relationship was separate 882 * from the parent relationship but that would require 883 * another set of links in the proc struct or for "wait" 884 * to scan the entire proc table. To make life easier, 885 * we just re-parent the process we're trying to trace. 886 * The old parent is remembered so we can put things back 887 * on a "detach". 888 */ 889 proc_set_traced(p, true); 890 if (p->p_pptr != td->td_proc) { 891 proc_reparent(p, td->td_proc); 892 } 893 data = SIGSTOP; 894 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 895 p->p_oppid); 896 goto sendsig; /* in PT_CONTINUE below */ 897 898 case PT_CLEARSTEP: 899 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 900 p->p_pid); 901 error = ptrace_clear_single_step(td2); 902 break; 903 904 case PT_SETSTEP: 905 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 906 p->p_pid); 907 error = ptrace_single_step(td2); 908 break; 909 910 case PT_SUSPEND: 911 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 912 p->p_pid); 913 td2->td_dbgflags |= TDB_SUSPEND; 914 thread_lock(td2); 915 td2->td_flags |= TDF_NEEDSUSPCHK; 916 thread_unlock(td2); 917 break; 918 919 case PT_RESUME: 920 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 921 p->p_pid); 922 td2->td_dbgflags &= ~TDB_SUSPEND; 923 break; 924 925 case PT_FOLLOW_FORK: 926 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 927 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 928 data ? "enabled" : "disabled"); 929 if (data) 930 p->p_ptevents |= PTRACE_FORK; 931 else 932 p->p_ptevents &= ~PTRACE_FORK; 933 break; 934 935 case PT_LWP_EVENTS: 936 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 937 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 938 data ? "enabled" : "disabled"); 939 if (data) 940 p->p_ptevents |= PTRACE_LWP; 941 else 942 p->p_ptevents &= ~PTRACE_LWP; 943 break; 944 945 case PT_GET_EVENT_MASK: 946 if (data != sizeof(p->p_ptevents)) { 947 error = EINVAL; 948 break; 949 } 950 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 951 p->p_ptevents); 952 *(int *)addr = p->p_ptevents; 953 break; 954 955 case PT_SET_EVENT_MASK: 956 if (data != sizeof(p->p_ptevents)) { 957 error = EINVAL; 958 break; 959 } 960 tmp = *(int *)addr; 961 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 962 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 963 error = EINVAL; 964 break; 965 } 966 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 967 p->p_pid, p->p_ptevents, tmp); 968 p->p_ptevents = tmp; 969 break; 970 971 case PT_STEP: 972 case PT_CONTINUE: 973 case PT_TO_SCE: 974 case PT_TO_SCX: 975 case PT_SYSCALL: 976 case PT_DETACH: 977 /* Zero means do not send any signal */ 978 if (data < 0 || data > _SIG_MAXSIG) { 979 error = EINVAL; 980 break; 981 } 982 983 switch (req) { 984 case PT_STEP: 985 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 986 td2->td_tid, p->p_pid, data); 987 error = ptrace_single_step(td2); 988 if (error) 989 goto out; 990 break; 991 case PT_CONTINUE: 992 case PT_TO_SCE: 993 case PT_TO_SCX: 994 case PT_SYSCALL: 995 if (addr != (void *)1) { 996 error = ptrace_set_pc(td2, 997 (u_long)(uintfptr_t)addr); 998 if (error) 999 goto out; 1000 } 1001 switch (req) { 1002 case PT_TO_SCE: 1003 p->p_ptevents |= PTRACE_SCE; 1004 CTR4(KTR_PTRACE, 1005 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1006 p->p_pid, p->p_ptevents, 1007 (u_long)(uintfptr_t)addr, data); 1008 break; 1009 case PT_TO_SCX: 1010 p->p_ptevents |= PTRACE_SCX; 1011 CTR4(KTR_PTRACE, 1012 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1013 p->p_pid, p->p_ptevents, 1014 (u_long)(uintfptr_t)addr, data); 1015 break; 1016 case PT_SYSCALL: 1017 p->p_ptevents |= PTRACE_SYSCALL; 1018 CTR4(KTR_PTRACE, 1019 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1020 p->p_pid, p->p_ptevents, 1021 (u_long)(uintfptr_t)addr, data); 1022 break; 1023 case PT_CONTINUE: 1024 CTR3(KTR_PTRACE, 1025 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1026 p->p_pid, (u_long)(uintfptr_t)addr, data); 1027 break; 1028 } 1029 break; 1030 case PT_DETACH: 1031 /* 1032 * Reset the process parent. 1033 * 1034 * NB: This clears P_TRACED before reparenting 1035 * a detached process back to its original 1036 * parent. Otherwise the debugee will be set 1037 * as an orphan of the debugger. 1038 */ 1039 p->p_flag &= ~(P_TRACED | P_WAITED); 1040 if (p->p_oppid != p->p_pptr->p_pid) { 1041 PROC_LOCK(p->p_pptr); 1042 sigqueue_take(p->p_ksi); 1043 PROC_UNLOCK(p->p_pptr); 1044 1045 pp = proc_realparent(p); 1046 proc_reparent(p, pp); 1047 if (pp == initproc) 1048 p->p_sigparent = SIGCHLD; 1049 CTR3(KTR_PTRACE, 1050 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1051 p->p_pid, pp->p_pid, data); 1052 } else 1053 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1054 p->p_pid, data); 1055 p->p_oppid = 0; 1056 p->p_ptevents = 0; 1057 FOREACH_THREAD_IN_PROC(p, td3) { 1058 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1059 sigqueue_delete(&td3->td_sigqueue, 1060 SIGSTOP); 1061 } 1062 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP); 1063 } 1064 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1065 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1066 p->p_flag2 &= ~P2_PTRACE_FSTP; 1067 } 1068 1069 /* should we send SIGCHLD? */ 1070 /* childproc_continued(p); */ 1071 break; 1072 } 1073 1074 sendsig: 1075 /* 1076 * Clear the pending event for the thread that just 1077 * reported its event (p_xthread). This may not be 1078 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1079 * the debugger is resuming a different thread. 1080 */ 1081 td2 = p->p_xthread; 1082 if (proctree_locked) { 1083 sx_xunlock(&proctree_lock); 1084 proctree_locked = 0; 1085 } 1086 p->p_xstat = data; 1087 p->p_xthread = NULL; 1088 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) { 1089 /* deliver or queue signal */ 1090 td2->td_dbgflags &= ~TDB_XSIG; 1091 td2->td_xsig = data; 1092 1093 /* 1094 * P_WKILLED is insurance that a PT_KILL/SIGKILL always 1095 * works immediately, even if another thread is 1096 * unsuspended first and attempts to handle a different 1097 * signal or if the POSIX.1b style signal queue cannot 1098 * accommodate any new signals. 1099 */ 1100 if (data == SIGKILL) 1101 p->p_flag |= P_WKILLED; 1102 1103 if (req == PT_DETACH) { 1104 FOREACH_THREAD_IN_PROC(p, td3) 1105 td3->td_dbgflags &= ~TDB_SUSPEND; 1106 } 1107 /* 1108 * unsuspend all threads, to not let a thread run, 1109 * you should use PT_SUSPEND to suspend it before 1110 * continuing process. 1111 */ 1112 PROC_SLOCK(p); 1113 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED); 1114 thread_unsuspend(p); 1115 PROC_SUNLOCK(p); 1116 if (req == PT_ATTACH) 1117 kern_psignal(p, data); 1118 } else { 1119 if (data) 1120 kern_psignal(p, data); 1121 } 1122 break; 1123 1124 case PT_WRITE_I: 1125 case PT_WRITE_D: 1126 td2->td_dbgflags |= TDB_USERWR; 1127 write = 1; 1128 /* FALLTHROUGH */ 1129 case PT_READ_I: 1130 case PT_READ_D: 1131 PROC_UNLOCK(p); 1132 tmp = 0; 1133 /* write = 0 set above */ 1134 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp; 1135 iov.iov_len = sizeof(int); 1136 uio.uio_iov = &iov; 1137 uio.uio_iovcnt = 1; 1138 uio.uio_offset = (off_t)(uintptr_t)addr; 1139 uio.uio_resid = sizeof(int); 1140 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */ 1141 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 1142 uio.uio_td = td; 1143 error = proc_rwmem(p, &uio); 1144 if (uio.uio_resid != 0) { 1145 /* 1146 * XXX proc_rwmem() doesn't currently return ENOSPC, 1147 * so I think write() can bogusly return 0. 1148 * XXX what happens for short writes? We don't want 1149 * to write partial data. 1150 * XXX proc_rwmem() returns EPERM for other invalid 1151 * addresses. Convert this to EINVAL. Does this 1152 * clobber returns of EPERM for other reasons? 1153 */ 1154 if (error == 0 || error == ENOSPC || error == EPERM) 1155 error = EINVAL; /* EOF */ 1156 } 1157 if (!write) 1158 td->td_retval[0] = tmp; 1159 if (error == 0) { 1160 if (write) 1161 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1162 p->p_pid, addr, data); 1163 else 1164 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1165 p->p_pid, addr, tmp); 1166 } 1167 PROC_LOCK(p); 1168 break; 1169 1170 case PT_IO: 1171#ifdef COMPAT_FREEBSD32 1172 if (wrap32) { 1173 piod32 = addr; 1174 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1175 iov.iov_len = piod32->piod_len; 1176 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1177 uio.uio_resid = piod32->piod_len; 1178 } else 1179#endif 1180 { 1181 piod = addr; 1182 iov.iov_base = piod->piod_addr; 1183 iov.iov_len = piod->piod_len; 1184 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1185 uio.uio_resid = piod->piod_len; 1186 } 1187 uio.uio_iov = &iov; 1188 uio.uio_iovcnt = 1; 1189 uio.uio_segflg = UIO_USERSPACE; 1190 uio.uio_td = td; 1191#ifdef COMPAT_FREEBSD32 1192 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1193#else 1194 tmp = piod->piod_op; 1195#endif 1196 switch (tmp) { 1197 case PIOD_READ_D: 1198 case PIOD_READ_I: 1199 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1200 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1201 uio.uio_rw = UIO_READ; 1202 break; 1203 case PIOD_WRITE_D: 1204 case PIOD_WRITE_I: 1205 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1206 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1207 td2->td_dbgflags |= TDB_USERWR; 1208 uio.uio_rw = UIO_WRITE; 1209 break; 1210 default: 1211 error = EINVAL; 1212 goto out; 1213 } 1214 PROC_UNLOCK(p); 1215 error = proc_rwmem(p, &uio); 1216#ifdef COMPAT_FREEBSD32 1217 if (wrap32) 1218 piod32->piod_len -= uio.uio_resid; 1219 else 1220#endif 1221 piod->piod_len -= uio.uio_resid; 1222 PROC_LOCK(p); 1223 break; 1224 1225 case PT_KILL: 1226 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1227 data = SIGKILL; 1228 goto sendsig; /* in PT_CONTINUE above */ 1229 1230 case PT_SETREGS: 1231 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1232 p->p_pid); 1233 td2->td_dbgflags |= TDB_USERWR; 1234 error = PROC_WRITE(regs, td2, addr); 1235 break; 1236 1237 case PT_GETREGS: 1238 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1239 p->p_pid); 1240 error = PROC_READ(regs, td2, addr); 1241 break; 1242 1243 case PT_SETFPREGS: 1244 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1245 p->p_pid); 1246 td2->td_dbgflags |= TDB_USERWR; 1247 error = PROC_WRITE(fpregs, td2, addr); 1248 break; 1249 1250 case PT_GETFPREGS: 1251 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1252 p->p_pid); 1253 error = PROC_READ(fpregs, td2, addr); 1254 break; 1255 1256 case PT_SETDBREGS: 1257 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1258 p->p_pid); 1259 td2->td_dbgflags |= TDB_USERWR; 1260 error = PROC_WRITE(dbregs, td2, addr); 1261 break; 1262 1263 case PT_GETDBREGS: 1264 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1265 p->p_pid); 1266 error = PROC_READ(dbregs, td2, addr); 1267 break; 1268 1269 case PT_LWPINFO: 1270 if (data <= 0 || 1271#ifdef COMPAT_FREEBSD32 1272 (!wrap32 && data > sizeof(*pl)) || 1273 (wrap32 && data > sizeof(*pl32))) { 1274#else 1275 data > sizeof(*pl)) { 1276#endif 1277 error = EINVAL; 1278 break; 1279 } 1280#ifdef COMPAT_FREEBSD32 1281 if (wrap32) { 1282 pl = &plr; 1283 pl32 = addr; 1284 } else 1285#endif 1286 pl = addr; 1287 bzero(pl, sizeof(*pl)); 1288 pl->pl_lwpid = td2->td_tid; 1289 pl->pl_event = PL_EVENT_NONE; 1290 pl->pl_flags = 0; 1291 if (td2->td_dbgflags & TDB_XSIG) { 1292 pl->pl_event = PL_EVENT_SIGNAL; 1293 if (td2->td_dbgksi.ksi_signo != 0 && 1294#ifdef COMPAT_FREEBSD32 1295 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1296 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1297 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1298 pl_siginfo) + sizeof(struct siginfo32))) 1299#else 1300 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1301 + sizeof(pl->pl_siginfo) 1302#endif 1303 ){ 1304 pl->pl_flags |= PL_FLAG_SI; 1305 pl->pl_siginfo = td2->td_dbgksi.ksi_info; 1306 } 1307 } 1308 if (td2->td_dbgflags & TDB_SCE) 1309 pl->pl_flags |= PL_FLAG_SCE; 1310 else if (td2->td_dbgflags & TDB_SCX) 1311 pl->pl_flags |= PL_FLAG_SCX; 1312 if (td2->td_dbgflags & TDB_EXEC) 1313 pl->pl_flags |= PL_FLAG_EXEC; 1314 if (td2->td_dbgflags & TDB_FORK) { 1315 pl->pl_flags |= PL_FLAG_FORKED; 1316 pl->pl_child_pid = td2->td_dbg_forked; 1317 if (td2->td_dbgflags & TDB_VFORK) 1318 pl->pl_flags |= PL_FLAG_VFORKED; 1319 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1320 TDB_VFORK) 1321 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1322 if (td2->td_dbgflags & TDB_CHILD) 1323 pl->pl_flags |= PL_FLAG_CHILD; 1324 if (td2->td_dbgflags & TDB_BORN) 1325 pl->pl_flags |= PL_FLAG_BORN; 1326 if (td2->td_dbgflags & TDB_EXIT) 1327 pl->pl_flags |= PL_FLAG_EXITED; 1328 pl->pl_sigmask = td2->td_sigmask; 1329 pl->pl_siglist = td2->td_siglist; 1330 strcpy(pl->pl_tdname, td2->td_name); 1331 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1332 pl->pl_syscall_code = td2->td_dbg_sc_code; 1333 pl->pl_syscall_narg = td2->td_dbg_sc_narg; 1334 } else { 1335 pl->pl_syscall_code = 0; 1336 pl->pl_syscall_narg = 0; 1337 } 1338#ifdef COMPAT_FREEBSD32 1339 if (wrap32) 1340 ptrace_lwpinfo_to32(pl, pl32); 1341#endif 1342 CTR6(KTR_PTRACE, 1343 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1344 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1345 pl->pl_child_pid, pl->pl_syscall_code); 1346 break; 1347 1348 case PT_GETNUMLWPS: 1349 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1350 p->p_numthreads); 1351 td->td_retval[0] = p->p_numthreads; 1352 break; 1353 1354 case PT_GETLWPLIST: 1355 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1356 p->p_pid, data, p->p_numthreads); 1357 if (data <= 0) { 1358 error = EINVAL; 1359 break; 1360 } 1361 num = imin(p->p_numthreads, data); 1362 PROC_UNLOCK(p); 1363 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1364 tmp = 0; 1365 PROC_LOCK(p); 1366 FOREACH_THREAD_IN_PROC(p, td2) { 1367 if (tmp >= num) 1368 break; 1369 buf[tmp++] = td2->td_tid; 1370 } 1371 PROC_UNLOCK(p); 1372 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1373 free(buf, M_TEMP); 1374 if (!error) 1375 td->td_retval[0] = tmp; 1376 PROC_LOCK(p); 1377 break; 1378 1379 case PT_VM_TIMESTAMP: 1380 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1381 p->p_pid, p->p_vmspace->vm_map.timestamp); 1382 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1383 break; 1384 1385 case PT_VM_ENTRY: 1386 PROC_UNLOCK(p); 1387#ifdef COMPAT_FREEBSD32 1388 if (wrap32) 1389 error = ptrace_vm_entry32(td, p, addr); 1390 else 1391#endif 1392 error = ptrace_vm_entry(td, p, addr); 1393 PROC_LOCK(p); 1394 break; 1395 1396 default: 1397#ifdef __HAVE_PTRACE_MACHDEP 1398 if (req >= PT_FIRSTMACH) { 1399 PROC_UNLOCK(p); 1400 error = cpu_ptrace(td2, req, addr, data); 1401 PROC_LOCK(p); 1402 } else 1403#endif 1404 /* Unknown request. */ 1405 error = EINVAL; 1406 break; 1407 } 1408 1409out: 1410 /* Drop our hold on this process now that the request has completed. */ 1411 _PRELE(p); 1412fail: 1413 PROC_UNLOCK(p); 1414 if (proctree_locked) 1415 sx_xunlock(&proctree_lock); 1416 return (error); 1417} 1418#undef PROC_READ 1419#undef PROC_WRITE 1420 1421/* 1422 * Stop a process because of a debugging event; 1423 * stay stopped until p->p_step is cleared 1424 * (cleared by PIOCCONT in procfs). 1425 */ 1426void 1427stopevent(struct proc *p, unsigned int event, unsigned int val) 1428{ 1429 1430 PROC_LOCK_ASSERT(p, MA_OWNED); 1431 p->p_step = 1; 1432 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1433 val); 1434 do { 1435 p->p_xstat = val; 1436 p->p_xthread = NULL; 1437 p->p_stype = event; /* Which event caused the stop? */ 1438 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1439 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1440 } while (p->p_step); 1441} 1442