sys_process.c revision 315949
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 315949 2017-03-25 13:33:23Z badger $"); 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 pl32->pl_lwpid = pl->pl_lwpid; 478 pl32->pl_event = pl->pl_event; 479 pl32->pl_flags = pl->pl_flags; 480 pl32->pl_sigmask = pl->pl_sigmask; 481 pl32->pl_siglist = pl->pl_siglist; 482 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 483 strcpy(pl32->pl_tdname, pl->pl_tdname); 484 pl32->pl_child_pid = pl->pl_child_pid; 485 pl32->pl_syscall_code = pl->pl_syscall_code; 486 pl32->pl_syscall_narg = pl->pl_syscall_narg; 487} 488#endif /* COMPAT_FREEBSD32 */ 489 490/* 491 * Process debugging system call. 492 */ 493#ifndef _SYS_SYSPROTO_H_ 494struct ptrace_args { 495 int req; 496 pid_t pid; 497 caddr_t addr; 498 int data; 499}; 500#endif 501 502#ifdef COMPAT_FREEBSD32 503/* 504 * This CPP subterfuge is to try and reduce the number of ifdefs in 505 * the body of the code. 506 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 507 * becomes either: 508 * copyin(uap->addr, &r.reg, sizeof r.reg); 509 * or 510 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 511 * .. except this is done at runtime. 512 */ 513#define COPYIN(u, k, s) wrap32 ? \ 514 copyin(u, k ## 32, s ## 32) : \ 515 copyin(u, k, s) 516#define COPYOUT(k, u, s) wrap32 ? \ 517 copyout(k ## 32, u, s ## 32) : \ 518 copyout(k, u, s) 519#else 520#define COPYIN(u, k, s) copyin(u, k, s) 521#define COPYOUT(k, u, s) copyout(k, u, s) 522#endif 523int 524sys_ptrace(struct thread *td, struct ptrace_args *uap) 525{ 526 /* 527 * XXX this obfuscation is to reduce stack usage, but the register 528 * structs may be too large to put on the stack anyway. 529 */ 530 union { 531 struct ptrace_io_desc piod; 532 struct ptrace_lwpinfo pl; 533 struct ptrace_vm_entry pve; 534 struct dbreg dbreg; 535 struct fpreg fpreg; 536 struct reg reg; 537#ifdef COMPAT_FREEBSD32 538 struct dbreg32 dbreg32; 539 struct fpreg32 fpreg32; 540 struct reg32 reg32; 541 struct ptrace_io_desc32 piod32; 542 struct ptrace_lwpinfo32 pl32; 543 struct ptrace_vm_entry32 pve32; 544#endif 545 int ptevents; 546 } r; 547 void *addr; 548 int error = 0; 549#ifdef COMPAT_FREEBSD32 550 int wrap32 = 0; 551 552 if (SV_CURPROC_FLAG(SV_ILP32)) 553 wrap32 = 1; 554#endif 555 AUDIT_ARG_PID(uap->pid); 556 AUDIT_ARG_CMD(uap->req); 557 AUDIT_ARG_VALUE(uap->data); 558 addr = &r; 559 switch (uap->req) { 560 case PT_GET_EVENT_MASK: 561 case PT_GETREGS: 562 case PT_GETFPREGS: 563 case PT_GETDBREGS: 564 case PT_LWPINFO: 565 break; 566 case PT_SETREGS: 567 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 568 break; 569 case PT_SETFPREGS: 570 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 571 break; 572 case PT_SETDBREGS: 573 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 574 break; 575 case PT_SET_EVENT_MASK: 576 if (uap->data != sizeof(r.ptevents)) 577 error = EINVAL; 578 else 579 error = copyin(uap->addr, &r.ptevents, uap->data); 580 break; 581 case PT_IO: 582 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 583 break; 584 case PT_VM_ENTRY: 585 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 586 break; 587 default: 588 addr = uap->addr; 589 break; 590 } 591 if (error) 592 return (error); 593 594 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 595 if (error) 596 return (error); 597 598 switch (uap->req) { 599 case PT_VM_ENTRY: 600 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 601 break; 602 case PT_IO: 603 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 604 break; 605 case PT_GETREGS: 606 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 607 break; 608 case PT_GETFPREGS: 609 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 610 break; 611 case PT_GETDBREGS: 612 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 613 break; 614 case PT_GET_EVENT_MASK: 615 /* NB: The size in uap->data is validated in kern_ptrace(). */ 616 error = copyout(&r.ptevents, uap->addr, uap->data); 617 break; 618 case PT_LWPINFO: 619 /* NB: The size in uap->data is validated in kern_ptrace(). */ 620 error = copyout(&r.pl, uap->addr, uap->data); 621 break; 622 } 623 624 return (error); 625} 626#undef COPYIN 627#undef COPYOUT 628 629#ifdef COMPAT_FREEBSD32 630/* 631 * PROC_READ(regs, td2, addr); 632 * becomes either: 633 * proc_read_regs(td2, addr); 634 * or 635 * proc_read_regs32(td2, addr); 636 * .. except this is done at runtime. There is an additional 637 * complication in that PROC_WRITE disallows 32 bit consumers 638 * from writing to 64 bit address space targets. 639 */ 640#define PROC_READ(w, t, a) wrap32 ? \ 641 proc_read_ ## w ## 32(t, a) : \ 642 proc_read_ ## w (t, a) 643#define PROC_WRITE(w, t, a) wrap32 ? \ 644 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 645 proc_write_ ## w (t, a) 646#else 647#define PROC_READ(w, t, a) proc_read_ ## w (t, a) 648#define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 649#endif 650 651void 652proc_set_traced(struct proc *p, bool stop) 653{ 654 655 PROC_LOCK_ASSERT(p, MA_OWNED); 656 p->p_flag |= P_TRACED; 657 if (stop) 658 p->p_flag2 |= P2_PTRACE_FSTP; 659 p->p_ptevents = PTRACE_DEFAULT; 660 p->p_oppid = p->p_pptr->p_pid; 661} 662 663int 664kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 665{ 666 struct iovec iov; 667 struct uio uio; 668 struct proc *curp, *p, *pp; 669 struct thread *td2 = NULL, *td3; 670 struct ptrace_io_desc *piod = NULL; 671 struct ptrace_lwpinfo *pl; 672 int error, write, tmp, num; 673 int proctree_locked = 0; 674 lwpid_t tid = 0, *buf; 675#ifdef COMPAT_FREEBSD32 676 int wrap32 = 0, safe = 0; 677 struct ptrace_io_desc32 *piod32 = NULL; 678 struct ptrace_lwpinfo32 *pl32 = NULL; 679 struct ptrace_lwpinfo plr; 680#endif 681 682 curp = td->td_proc; 683 684 /* Lock proctree before locking the process. */ 685 switch (req) { 686 case PT_TRACE_ME: 687 case PT_ATTACH: 688 case PT_STEP: 689 case PT_CONTINUE: 690 case PT_TO_SCE: 691 case PT_TO_SCX: 692 case PT_SYSCALL: 693 case PT_FOLLOW_FORK: 694 case PT_LWP_EVENTS: 695 case PT_GET_EVENT_MASK: 696 case PT_SET_EVENT_MASK: 697 case PT_DETACH: 698 sx_xlock(&proctree_lock); 699 proctree_locked = 1; 700 break; 701 default: 702 break; 703 } 704 705 write = 0; 706 if (req == PT_TRACE_ME) { 707 p = td->td_proc; 708 PROC_LOCK(p); 709 } else { 710 if (pid <= PID_MAX) { 711 if ((p = pfind(pid)) == NULL) { 712 if (proctree_locked) 713 sx_xunlock(&proctree_lock); 714 return (ESRCH); 715 } 716 } else { 717 td2 = tdfind(pid, -1); 718 if (td2 == NULL) { 719 if (proctree_locked) 720 sx_xunlock(&proctree_lock); 721 return (ESRCH); 722 } 723 p = td2->td_proc; 724 tid = pid; 725 pid = p->p_pid; 726 } 727 } 728 AUDIT_ARG_PROCESS(p); 729 730 if ((p->p_flag & P_WEXIT) != 0) { 731 error = ESRCH; 732 goto fail; 733 } 734 if ((error = p_cansee(td, p)) != 0) 735 goto fail; 736 737 if ((error = p_candebug(td, p)) != 0) 738 goto fail; 739 740 /* 741 * System processes can't be debugged. 742 */ 743 if ((p->p_flag & P_SYSTEM) != 0) { 744 error = EINVAL; 745 goto fail; 746 } 747 748 if (tid == 0) { 749 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 750 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 751 td2 = p->p_xthread; 752 } else { 753 td2 = FIRST_THREAD_IN_PROC(p); 754 } 755 tid = td2->td_tid; 756 } 757 758#ifdef COMPAT_FREEBSD32 759 /* 760 * Test if we're a 32 bit client and what the target is. 761 * Set the wrap controls accordingly. 762 */ 763 if (SV_CURPROC_FLAG(SV_ILP32)) { 764 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 765 safe = 1; 766 wrap32 = 1; 767 } 768#endif 769 /* 770 * Permissions check 771 */ 772 switch (req) { 773 case PT_TRACE_ME: 774 /* 775 * Always legal, when there is a parent process which 776 * could trace us. Otherwise, reject. 777 */ 778 if ((p->p_flag & P_TRACED) != 0) { 779 error = EBUSY; 780 goto fail; 781 } 782 if (p->p_pptr == initproc) { 783 error = EPERM; 784 goto fail; 785 } 786 break; 787 788 case PT_ATTACH: 789 /* Self */ 790 if (p == td->td_proc) { 791 error = EINVAL; 792 goto fail; 793 } 794 795 /* Already traced */ 796 if (p->p_flag & P_TRACED) { 797 error = EBUSY; 798 goto fail; 799 } 800 801 /* Can't trace an ancestor if you're being traced. */ 802 if (curp->p_flag & P_TRACED) { 803 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 804 if (pp == p) { 805 error = EINVAL; 806 goto fail; 807 } 808 } 809 } 810 811 812 /* OK */ 813 break; 814 815 case PT_CLEARSTEP: 816 /* Allow thread to clear single step for itself */ 817 if (td->td_tid == tid) 818 break; 819 820 /* FALLTHROUGH */ 821 default: 822 /* not being traced... */ 823 if ((p->p_flag & P_TRACED) == 0) { 824 error = EPERM; 825 goto fail; 826 } 827 828 /* not being traced by YOU */ 829 if (p->p_pptr != td->td_proc) { 830 error = EBUSY; 831 goto fail; 832 } 833 834 /* not currently stopped */ 835 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 || 836 p->p_suspcount != p->p_numthreads || 837 (p->p_flag & P_WAITED) == 0) { 838 error = EBUSY; 839 goto fail; 840 } 841 842 if ((p->p_flag & P_STOPPED_TRACE) == 0) { 843 static int count = 0; 844 if (count++ == 0) 845 printf("P_STOPPED_TRACE not set.\n"); 846 } 847 848 /* OK */ 849 break; 850 } 851 852 /* Keep this process around until we finish this request. */ 853 _PHOLD(p); 854 855#ifdef FIX_SSTEP 856 /* 857 * Single step fixup ala procfs 858 */ 859 FIX_SSTEP(td2); 860#endif 861 862 /* 863 * Actually do the requests 864 */ 865 866 td->td_retval[0] = 0; 867 868 switch (req) { 869 case PT_TRACE_ME: 870 /* set my trace flag and "owner" so it can read/write me */ 871 proc_set_traced(p, false); 872 if (p->p_flag & P_PPWAIT) 873 p->p_flag |= P_PPTRACE; 874 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 875 break; 876 877 case PT_ATTACH: 878 /* security check done above */ 879 /* 880 * It would be nice if the tracing relationship was separate 881 * from the parent relationship but that would require 882 * another set of links in the proc struct or for "wait" 883 * to scan the entire proc table. To make life easier, 884 * we just re-parent the process we're trying to trace. 885 * The old parent is remembered so we can put things back 886 * on a "detach". 887 */ 888 proc_set_traced(p, true); 889 if (p->p_pptr != td->td_proc) { 890 proc_reparent(p, td->td_proc); 891 } 892 data = SIGSTOP; 893 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 894 p->p_oppid); 895 goto sendsig; /* in PT_CONTINUE below */ 896 897 case PT_CLEARSTEP: 898 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 899 p->p_pid); 900 error = ptrace_clear_single_step(td2); 901 break; 902 903 case PT_SETSTEP: 904 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 905 p->p_pid); 906 error = ptrace_single_step(td2); 907 break; 908 909 case PT_SUSPEND: 910 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 911 p->p_pid); 912 td2->td_dbgflags |= TDB_SUSPEND; 913 thread_lock(td2); 914 td2->td_flags |= TDF_NEEDSUSPCHK; 915 thread_unlock(td2); 916 break; 917 918 case PT_RESUME: 919 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 920 p->p_pid); 921 td2->td_dbgflags &= ~TDB_SUSPEND; 922 break; 923 924 case PT_FOLLOW_FORK: 925 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 926 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 927 data ? "enabled" : "disabled"); 928 if (data) 929 p->p_ptevents |= PTRACE_FORK; 930 else 931 p->p_ptevents &= ~PTRACE_FORK; 932 break; 933 934 case PT_LWP_EVENTS: 935 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 936 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 937 data ? "enabled" : "disabled"); 938 if (data) 939 p->p_ptevents |= PTRACE_LWP; 940 else 941 p->p_ptevents &= ~PTRACE_LWP; 942 break; 943 944 case PT_GET_EVENT_MASK: 945 if (data != sizeof(p->p_ptevents)) { 946 error = EINVAL; 947 break; 948 } 949 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 950 p->p_ptevents); 951 *(int *)addr = p->p_ptevents; 952 break; 953 954 case PT_SET_EVENT_MASK: 955 if (data != sizeof(p->p_ptevents)) { 956 error = EINVAL; 957 break; 958 } 959 tmp = *(int *)addr; 960 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 961 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 962 error = EINVAL; 963 break; 964 } 965 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 966 p->p_pid, p->p_ptevents, tmp); 967 p->p_ptevents = tmp; 968 break; 969 970 case PT_STEP: 971 case PT_CONTINUE: 972 case PT_TO_SCE: 973 case PT_TO_SCX: 974 case PT_SYSCALL: 975 case PT_DETACH: 976 /* Zero means do not send any signal */ 977 if (data < 0 || data > _SIG_MAXSIG) { 978 error = EINVAL; 979 break; 980 } 981 982 switch (req) { 983 case PT_STEP: 984 CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)", 985 td2->td_tid, p->p_pid); 986 error = ptrace_single_step(td2); 987 if (error) 988 goto out; 989 break; 990 case PT_CONTINUE: 991 case PT_TO_SCE: 992 case PT_TO_SCX: 993 case PT_SYSCALL: 994 if (addr != (void *)1) { 995 error = ptrace_set_pc(td2, 996 (u_long)(uintfptr_t)addr); 997 if (error) 998 goto out; 999 } 1000 switch (req) { 1001 case PT_TO_SCE: 1002 p->p_ptevents |= PTRACE_SCE; 1003 CTR4(KTR_PTRACE, 1004 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1005 p->p_pid, p->p_ptevents, 1006 (u_long)(uintfptr_t)addr, data); 1007 break; 1008 case PT_TO_SCX: 1009 p->p_ptevents |= PTRACE_SCX; 1010 CTR4(KTR_PTRACE, 1011 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1012 p->p_pid, p->p_ptevents, 1013 (u_long)(uintfptr_t)addr, data); 1014 break; 1015 case PT_SYSCALL: 1016 p->p_ptevents |= PTRACE_SYSCALL; 1017 CTR4(KTR_PTRACE, 1018 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1019 p->p_pid, p->p_ptevents, 1020 (u_long)(uintfptr_t)addr, data); 1021 break; 1022 case PT_CONTINUE: 1023 CTR3(KTR_PTRACE, 1024 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1025 p->p_pid, (u_long)(uintfptr_t)addr, data); 1026 break; 1027 } 1028 break; 1029 case PT_DETACH: 1030 /* 1031 * Reset the process parent. 1032 * 1033 * NB: This clears P_TRACED before reparenting 1034 * a detached process back to its original 1035 * parent. Otherwise the debugee will be set 1036 * as an orphan of the debugger. 1037 */ 1038 p->p_flag &= ~(P_TRACED | P_WAITED); 1039 if (p->p_oppid != p->p_pptr->p_pid) { 1040 PROC_LOCK(p->p_pptr); 1041 sigqueue_take(p->p_ksi); 1042 PROC_UNLOCK(p->p_pptr); 1043 1044 pp = proc_realparent(p); 1045 proc_reparent(p, pp); 1046 if (pp == initproc) 1047 p->p_sigparent = SIGCHLD; 1048 CTR3(KTR_PTRACE, 1049 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1050 p->p_pid, pp->p_pid, data); 1051 } else 1052 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1053 p->p_pid, data); 1054 p->p_oppid = 0; 1055 p->p_ptevents = 0; 1056 FOREACH_THREAD_IN_PROC(p, td3) { 1057 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1058 sigqueue_delete(&td3->td_sigqueue, 1059 SIGSTOP); 1060 } 1061 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP); 1062 } 1063 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1064 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1065 p->p_flag2 &= ~P2_PTRACE_FSTP; 1066 } 1067 1068 /* should we send SIGCHLD? */ 1069 /* childproc_continued(p); */ 1070 break; 1071 } 1072 1073 sendsig: 1074 if (proctree_locked) { 1075 sx_xunlock(&proctree_lock); 1076 proctree_locked = 0; 1077 } 1078 p->p_xstat = data; 1079 p->p_xthread = NULL; 1080 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) { 1081 /* deliver or queue signal */ 1082 td2->td_dbgflags &= ~TDB_XSIG; 1083 td2->td_xsig = data; 1084 1085 /* 1086 * P_WKILLED is insurance that a PT_KILL/SIGKILL always 1087 * works immediately, even if another thread is 1088 * unsuspended first and attempts to handle a different 1089 * signal or if the POSIX.1b style signal queue cannot 1090 * accommodate any new signals. 1091 */ 1092 if (data == SIGKILL) 1093 p->p_flag |= P_WKILLED; 1094 1095 if (req == PT_DETACH) { 1096 FOREACH_THREAD_IN_PROC(p, td3) 1097 td3->td_dbgflags &= ~TDB_SUSPEND; 1098 } 1099 /* 1100 * unsuspend all threads, to not let a thread run, 1101 * you should use PT_SUSPEND to suspend it before 1102 * continuing process. 1103 */ 1104 PROC_SLOCK(p); 1105 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED); 1106 thread_unsuspend(p); 1107 PROC_SUNLOCK(p); 1108 if (req == PT_ATTACH) 1109 kern_psignal(p, data); 1110 } else { 1111 if (data) 1112 kern_psignal(p, data); 1113 } 1114 break; 1115 1116 case PT_WRITE_I: 1117 case PT_WRITE_D: 1118 td2->td_dbgflags |= TDB_USERWR; 1119 write = 1; 1120 /* FALLTHROUGH */ 1121 case PT_READ_I: 1122 case PT_READ_D: 1123 PROC_UNLOCK(p); 1124 tmp = 0; 1125 /* write = 0 set above */ 1126 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp; 1127 iov.iov_len = sizeof(int); 1128 uio.uio_iov = &iov; 1129 uio.uio_iovcnt = 1; 1130 uio.uio_offset = (off_t)(uintptr_t)addr; 1131 uio.uio_resid = sizeof(int); 1132 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */ 1133 uio.uio_rw = write ? UIO_WRITE : UIO_READ; 1134 uio.uio_td = td; 1135 error = proc_rwmem(p, &uio); 1136 if (uio.uio_resid != 0) { 1137 /* 1138 * XXX proc_rwmem() doesn't currently return ENOSPC, 1139 * so I think write() can bogusly return 0. 1140 * XXX what happens for short writes? We don't want 1141 * to write partial data. 1142 * XXX proc_rwmem() returns EPERM for other invalid 1143 * addresses. Convert this to EINVAL. Does this 1144 * clobber returns of EPERM for other reasons? 1145 */ 1146 if (error == 0 || error == ENOSPC || error == EPERM) 1147 error = EINVAL; /* EOF */ 1148 } 1149 if (!write) 1150 td->td_retval[0] = tmp; 1151 if (error == 0) { 1152 if (write) 1153 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1154 p->p_pid, addr, data); 1155 else 1156 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1157 p->p_pid, addr, tmp); 1158 } 1159 PROC_LOCK(p); 1160 break; 1161 1162 case PT_IO: 1163#ifdef COMPAT_FREEBSD32 1164 if (wrap32) { 1165 piod32 = addr; 1166 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1167 iov.iov_len = piod32->piod_len; 1168 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1169 uio.uio_resid = piod32->piod_len; 1170 } else 1171#endif 1172 { 1173 piod = addr; 1174 iov.iov_base = piod->piod_addr; 1175 iov.iov_len = piod->piod_len; 1176 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1177 uio.uio_resid = piod->piod_len; 1178 } 1179 uio.uio_iov = &iov; 1180 uio.uio_iovcnt = 1; 1181 uio.uio_segflg = UIO_USERSPACE; 1182 uio.uio_td = td; 1183#ifdef COMPAT_FREEBSD32 1184 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1185#else 1186 tmp = piod->piod_op; 1187#endif 1188 switch (tmp) { 1189 case PIOD_READ_D: 1190 case PIOD_READ_I: 1191 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1192 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1193 uio.uio_rw = UIO_READ; 1194 break; 1195 case PIOD_WRITE_D: 1196 case PIOD_WRITE_I: 1197 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1198 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1199 td2->td_dbgflags |= TDB_USERWR; 1200 uio.uio_rw = UIO_WRITE; 1201 break; 1202 default: 1203 error = EINVAL; 1204 goto out; 1205 } 1206 PROC_UNLOCK(p); 1207 error = proc_rwmem(p, &uio); 1208#ifdef COMPAT_FREEBSD32 1209 if (wrap32) 1210 piod32->piod_len -= uio.uio_resid; 1211 else 1212#endif 1213 piod->piod_len -= uio.uio_resid; 1214 PROC_LOCK(p); 1215 break; 1216 1217 case PT_KILL: 1218 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1219 data = SIGKILL; 1220 goto sendsig; /* in PT_CONTINUE above */ 1221 1222 case PT_SETREGS: 1223 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1224 p->p_pid); 1225 td2->td_dbgflags |= TDB_USERWR; 1226 error = PROC_WRITE(regs, td2, addr); 1227 break; 1228 1229 case PT_GETREGS: 1230 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1231 p->p_pid); 1232 error = PROC_READ(regs, td2, addr); 1233 break; 1234 1235 case PT_SETFPREGS: 1236 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1237 p->p_pid); 1238 td2->td_dbgflags |= TDB_USERWR; 1239 error = PROC_WRITE(fpregs, td2, addr); 1240 break; 1241 1242 case PT_GETFPREGS: 1243 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1244 p->p_pid); 1245 error = PROC_READ(fpregs, td2, addr); 1246 break; 1247 1248 case PT_SETDBREGS: 1249 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1250 p->p_pid); 1251 td2->td_dbgflags |= TDB_USERWR; 1252 error = PROC_WRITE(dbregs, td2, addr); 1253 break; 1254 1255 case PT_GETDBREGS: 1256 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1257 p->p_pid); 1258 error = PROC_READ(dbregs, td2, addr); 1259 break; 1260 1261 case PT_LWPINFO: 1262 if (data <= 0 || 1263#ifdef COMPAT_FREEBSD32 1264 (!wrap32 && data > sizeof(*pl)) || 1265 (wrap32 && data > sizeof(*pl32))) { 1266#else 1267 data > sizeof(*pl)) { 1268#endif 1269 error = EINVAL; 1270 break; 1271 } 1272#ifdef COMPAT_FREEBSD32 1273 if (wrap32) { 1274 pl = &plr; 1275 pl32 = addr; 1276 } else 1277#endif 1278 pl = addr; 1279 pl->pl_lwpid = td2->td_tid; 1280 pl->pl_event = PL_EVENT_NONE; 1281 pl->pl_flags = 0; 1282 if (td2->td_dbgflags & TDB_XSIG) { 1283 pl->pl_event = PL_EVENT_SIGNAL; 1284 if (td2->td_dbgksi.ksi_signo != 0 && 1285#ifdef COMPAT_FREEBSD32 1286 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1287 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1288 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1289 pl_siginfo) + sizeof(struct siginfo32))) 1290#else 1291 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1292 + sizeof(pl->pl_siginfo) 1293#endif 1294 ){ 1295 pl->pl_flags |= PL_FLAG_SI; 1296 pl->pl_siginfo = td2->td_dbgksi.ksi_info; 1297 } 1298 } 1299 if ((pl->pl_flags & PL_FLAG_SI) == 0) 1300 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo)); 1301 if (td2->td_dbgflags & TDB_SCE) 1302 pl->pl_flags |= PL_FLAG_SCE; 1303 else if (td2->td_dbgflags & TDB_SCX) 1304 pl->pl_flags |= PL_FLAG_SCX; 1305 if (td2->td_dbgflags & TDB_EXEC) 1306 pl->pl_flags |= PL_FLAG_EXEC; 1307 if (td2->td_dbgflags & TDB_FORK) { 1308 pl->pl_flags |= PL_FLAG_FORKED; 1309 pl->pl_child_pid = td2->td_dbg_forked; 1310 if (td2->td_dbgflags & TDB_VFORK) 1311 pl->pl_flags |= PL_FLAG_VFORKED; 1312 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1313 TDB_VFORK) 1314 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1315 if (td2->td_dbgflags & TDB_CHILD) 1316 pl->pl_flags |= PL_FLAG_CHILD; 1317 if (td2->td_dbgflags & TDB_BORN) 1318 pl->pl_flags |= PL_FLAG_BORN; 1319 if (td2->td_dbgflags & TDB_EXIT) 1320 pl->pl_flags |= PL_FLAG_EXITED; 1321 pl->pl_sigmask = td2->td_sigmask; 1322 pl->pl_siglist = td2->td_siglist; 1323 strcpy(pl->pl_tdname, td2->td_name); 1324 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1325 pl->pl_syscall_code = td2->td_dbg_sc_code; 1326 pl->pl_syscall_narg = td2->td_dbg_sc_narg; 1327 } else { 1328 pl->pl_syscall_code = 0; 1329 pl->pl_syscall_narg = 0; 1330 } 1331#ifdef COMPAT_FREEBSD32 1332 if (wrap32) 1333 ptrace_lwpinfo_to32(pl, pl32); 1334#endif 1335 CTR6(KTR_PTRACE, 1336 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1337 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1338 pl->pl_child_pid, pl->pl_syscall_code); 1339 break; 1340 1341 case PT_GETNUMLWPS: 1342 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1343 p->p_numthreads); 1344 td->td_retval[0] = p->p_numthreads; 1345 break; 1346 1347 case PT_GETLWPLIST: 1348 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1349 p->p_pid, data, p->p_numthreads); 1350 if (data <= 0) { 1351 error = EINVAL; 1352 break; 1353 } 1354 num = imin(p->p_numthreads, data); 1355 PROC_UNLOCK(p); 1356 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1357 tmp = 0; 1358 PROC_LOCK(p); 1359 FOREACH_THREAD_IN_PROC(p, td2) { 1360 if (tmp >= num) 1361 break; 1362 buf[tmp++] = td2->td_tid; 1363 } 1364 PROC_UNLOCK(p); 1365 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1366 free(buf, M_TEMP); 1367 if (!error) 1368 td->td_retval[0] = tmp; 1369 PROC_LOCK(p); 1370 break; 1371 1372 case PT_VM_TIMESTAMP: 1373 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1374 p->p_pid, p->p_vmspace->vm_map.timestamp); 1375 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1376 break; 1377 1378 case PT_VM_ENTRY: 1379 PROC_UNLOCK(p); 1380#ifdef COMPAT_FREEBSD32 1381 if (wrap32) 1382 error = ptrace_vm_entry32(td, p, addr); 1383 else 1384#endif 1385 error = ptrace_vm_entry(td, p, addr); 1386 PROC_LOCK(p); 1387 break; 1388 1389 default: 1390#ifdef __HAVE_PTRACE_MACHDEP 1391 if (req >= PT_FIRSTMACH) { 1392 PROC_UNLOCK(p); 1393 error = cpu_ptrace(td2, req, addr, data); 1394 PROC_LOCK(p); 1395 } else 1396#endif 1397 /* Unknown request. */ 1398 error = EINVAL; 1399 break; 1400 } 1401 1402out: 1403 /* Drop our hold on this process now that the request has completed. */ 1404 _PRELE(p); 1405fail: 1406 PROC_UNLOCK(p); 1407 if (proctree_locked) 1408 sx_xunlock(&proctree_lock); 1409 return (error); 1410} 1411#undef PROC_READ 1412#undef PROC_WRITE 1413 1414/* 1415 * Stop a process because of a debugging event; 1416 * stay stopped until p->p_step is cleared 1417 * (cleared by PIOCCONT in procfs). 1418 */ 1419void 1420stopevent(struct proc *p, unsigned int event, unsigned int val) 1421{ 1422 1423 PROC_LOCK_ASSERT(p, MA_OWNED); 1424 p->p_step = 1; 1425 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1426 val); 1427 do { 1428 p->p_xstat = val; 1429 p->p_xthread = NULL; 1430 p->p_stype = event; /* Which event caused the stop? */ 1431 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1432 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1433 } while (p->p_step); 1434} 1435