Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/kern/sys_process.c
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1 /*- 2 * Copyright (c) 1994, Sean Eric Fagan 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Sean Eric Fagan. 16 * 4. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_compat.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/lock.h> 40 #include <sys/mutex.h> 41 #include <sys/syscallsubr.h> 42 #include <sys/sysent.h> 43 #include <sys/sysproto.h> 44 #include <sys/pioctl.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/vnode.h> 48 #include <sys/ptrace.h> 49 #include <sys/rwlock.h> 50 #include <sys/sx.h> 51 #include <sys/malloc.h> 52 #include <sys/signalvar.h> 53 54 #include <machine/reg.h> 55 56 #include <security/audit/audit.h> 57 58 #include <vm/vm.h> 59 #include <vm/pmap.h> 60 #include <vm/vm_extern.h> 61 #include <vm/vm_map.h> 62 #include <vm/vm_kern.h> 63 #include <vm/vm_object.h> 64 #include <vm/vm_page.h> 65 #include <vm/vm_param.h> 66 67 #ifdef COMPAT_FREEBSD32 68 #include <sys/procfs.h> 69 #include <compat/freebsd32/freebsd32_signal.h> 70 71 struct ptrace_io_desc32 { 72 int piod_op; 73 uint32_t piod_offs; 74 uint32_t piod_addr; 75 uint32_t piod_len; 76 }; 77 78 struct ptrace_vm_entry32 { 79 int pve_entry; 80 int pve_timestamp; 81 uint32_t pve_start; 82 uint32_t pve_end; 83 uint32_t pve_offset; 84 u_int pve_prot; 85 u_int pve_pathlen; 86 int32_t pve_fileid; 87 u_int pve_fsid; 88 uint32_t pve_path; 89 }; 90 #endif 91 92 /* 93 * Functions implemented using PROC_ACTION(): 94 * 95 * proc_read_regs(proc, regs) 96 * Get the current user-visible register set from the process 97 * and copy it into the regs structure (<machine/reg.h>). 98 * The process is stopped at the time read_regs is called. 99 * 100 * proc_write_regs(proc, regs) 101 * Update the current register set from the passed in regs 102 * structure. Take care to avoid clobbering special CPU 103 * registers or privileged bits in the PSL. 104 * Depending on the architecture this may have fix-up work to do, 105 * especially if the IAR or PCW are modified. 106 * The process is stopped at the time write_regs is called. 107 * 108 * proc_read_fpregs, proc_write_fpregs 109 * deal with the floating point register set, otherwise as above. 110 * 111 * proc_read_dbregs, proc_write_dbregs 112 * deal with the processor debug register set, otherwise as above. 113 * 114 * proc_sstep(proc) 115 * Arrange for the process to trap after executing a single instruction. 116 */ 117 118 #define PROC_ACTION(action) do { \ 119 int error; \ 120 \ 121 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 122 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 123 error = EIO; \ 124 else \ 125 error = (action); \ 126 return (error); \ 127 } while(0) 128 129 int 130 proc_read_regs(struct thread *td, struct reg *regs) 131 { 132 133 PROC_ACTION(fill_regs(td, regs)); 134 } 135 136 int 137 proc_write_regs(struct thread *td, struct reg *regs) 138 { 139 140 PROC_ACTION(set_regs(td, regs)); 141 } 142 143 int 144 proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 145 { 146 147 PROC_ACTION(fill_dbregs(td, dbregs)); 148 } 149 150 int 151 proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 152 { 153 154 PROC_ACTION(set_dbregs(td, dbregs)); 155 } 156 157 /* 158 * Ptrace doesn't support fpregs at all, and there are no security holes 159 * or translations for fpregs, so we can just copy them. 160 */ 161 int 162 proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 163 { 164 165 PROC_ACTION(fill_fpregs(td, fpregs)); 166 } 167 168 int 169 proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 170 { 171 172 PROC_ACTION(set_fpregs(td, fpregs)); 173 } 174 175 #ifdef COMPAT_FREEBSD32 176 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 177 int 178 proc_read_regs32(struct thread *td, struct reg32 *regs32) 179 { 180 181 PROC_ACTION(fill_regs32(td, regs32)); 182 } 183 184 int 185 proc_write_regs32(struct thread *td, struct reg32 *regs32) 186 { 187 188 PROC_ACTION(set_regs32(td, regs32)); 189 } 190 191 int 192 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 193 { 194 195 PROC_ACTION(fill_dbregs32(td, dbregs32)); 196 } 197 198 int 199 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 200 { 201 202 PROC_ACTION(set_dbregs32(td, dbregs32)); 203 } 204 205 int 206 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 207 { 208 209 PROC_ACTION(fill_fpregs32(td, fpregs32)); 210 } 211 212 int 213 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 214 { 215 216 PROC_ACTION(set_fpregs32(td, fpregs32)); 217 } 218 #endif 219 220 int 221 proc_sstep(struct thread *td) 222 { 223 224 PROC_ACTION(ptrace_single_step(td)); 225 } 226 227 int 228 proc_rwmem(struct proc *p, struct uio *uio) 229 { 230 vm_map_t map; 231 vm_offset_t pageno; /* page number */ 232 vm_prot_t reqprot; 233 int error, fault_flags, page_offset, writing; 234 235 /* 236 * Assert that someone has locked this vmspace. (Should be 237 * curthread but we can't assert that.) This keeps the process 238 * from exiting out from under us until this operation completes. 239 */ 240 PROC_ASSERT_HELD(p); 241 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 242 243 /* 244 * The map we want... 245 */ 246 map = &p->p_vmspace->vm_map; 247 248 /* 249 * If we are writing, then we request vm_fault() to create a private 250 * copy of each page. Since these copies will not be writeable by the 251 * process, we must explicity request that they be dirtied. 252 */ 253 writing = uio->uio_rw == UIO_WRITE; 254 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 255 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 256 257 /* 258 * Only map in one page at a time. We don't have to, but it 259 * makes things easier. This way is trivial - right? 260 */ 261 do { 262 vm_offset_t uva; 263 u_int len; 264 vm_page_t m; 265 266 uva = (vm_offset_t)uio->uio_offset; 267 268 /* 269 * Get the page number of this segment. 270 */ 271 pageno = trunc_page(uva); 272 page_offset = uva - pageno; 273 274 /* 275 * How many bytes to copy 276 */ 277 len = min(PAGE_SIZE - page_offset, uio->uio_resid); 278 279 /* 280 * Fault and hold the page on behalf of the process. 281 */ 282 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m); 283 if (error != KERN_SUCCESS) { 284 if (error == KERN_RESOURCE_SHORTAGE) 285 error = ENOMEM; 286 else 287 error = EFAULT; 288 break; 289 } 290 291 /* 292 * Now do the i/o move. 293 */ 294 error = uiomove_fromphys(&m, page_offset, len, uio); 295 296 /* Make the I-cache coherent for breakpoints. */ 297 if (writing && error == 0) { 298 vm_map_lock_read(map); 299 if (vm_map_check_protection(map, pageno, pageno + 300 PAGE_SIZE, VM_PROT_EXECUTE)) 301 vm_sync_icache(map, uva, len); 302 vm_map_unlock_read(map); 303 } 304 305 /* 306 * Release the page. 307 */ 308 vm_page_lock(m); 309 vm_page_unhold(m); 310 vm_page_unlock(m); 311 312 } while (error == 0 && uio->uio_resid > 0); 313 314 return (error); 315 } 316 317 static ssize_t 318 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 319 size_t len, enum uio_rw rw) 320 { 321 struct iovec iov; 322 struct uio uio; 323 ssize_t slen; 324 int error; 325 326 MPASS(len < SSIZE_MAX); 327 slen = (ssize_t)len; 328 329 iov.iov_base = (caddr_t)buf; 330 iov.iov_len = len; 331 uio.uio_iov = &iov; 332 uio.uio_iovcnt = 1; 333 uio.uio_offset = va; 334 uio.uio_resid = slen; 335 uio.uio_segflg = UIO_SYSSPACE; 336 uio.uio_rw = rw; 337 uio.uio_td = td; 338 error = proc_rwmem(p, &uio); 339 if (uio.uio_resid == slen) 340 return (-1); 341 return (slen - uio.uio_resid); 342 } 343 344 ssize_t 345 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 346 size_t len) 347 { 348 349 return (proc_iop(td, p, va, buf, len, UIO_READ)); 350 } 351 352 ssize_t 353 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 354 size_t len) 355 { 356 357 return (proc_iop(td, p, va, buf, len, UIO_WRITE)); 358 } 359 360 static int 361 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 362 { 363 struct vattr vattr; 364 vm_map_t map; 365 vm_map_entry_t entry; 366 vm_object_t obj, tobj, lobj; 367 struct vmspace *vm; 368 struct vnode *vp; 369 char *freepath, *fullpath; 370 u_int pathlen; 371 int error, index; 372 373 error = 0; 374 obj = NULL; 375 376 vm = vmspace_acquire_ref(p); 377 map = &vm->vm_map; 378 vm_map_lock_read(map); 379 380 do { 381 entry = map->header.next; 382 index = 0; 383 while (index < pve->pve_entry && entry != &map->header) { 384 entry = entry->next; 385 index++; 386 } 387 if (index != pve->pve_entry) { 388 error = EINVAL; 389 break; 390 } 391 while (entry != &map->header && 392 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 393 entry = entry->next; 394 index++; 395 } 396 if (entry == &map->header) { 397 error = ENOENT; 398 break; 399 } 400 401 /* We got an entry. */ 402 pve->pve_entry = index + 1; 403 pve->pve_timestamp = map->timestamp; 404 pve->pve_start = entry->start; 405 pve->pve_end = entry->end - 1; 406 pve->pve_offset = entry->offset; 407 pve->pve_prot = entry->protection; 408 409 /* Backing object's path needed? */ 410 if (pve->pve_pathlen == 0) 411 break; 412 413 pathlen = pve->pve_pathlen; 414 pve->pve_pathlen = 0; 415 416 obj = entry->object.vm_object; 417 if (obj != NULL) 418 VM_OBJECT_RLOCK(obj); 419 } while (0); 420 421 vm_map_unlock_read(map); 422 423 pve->pve_fsid = VNOVAL; 424 pve->pve_fileid = VNOVAL; 425 426 if (error == 0 && obj != NULL) { 427 lobj = obj; 428 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 429 if (tobj != obj) 430 VM_OBJECT_RLOCK(tobj); 431 if (lobj != obj) 432 VM_OBJECT_RUNLOCK(lobj); 433 lobj = tobj; 434 pve->pve_offset += tobj->backing_object_offset; 435 } 436 vp = vm_object_vnode(lobj); 437 if (vp != NULL) 438 vref(vp); 439 if (lobj != obj) 440 VM_OBJECT_RUNLOCK(lobj); 441 VM_OBJECT_RUNLOCK(obj); 442 443 if (vp != NULL) { 444 freepath = NULL; 445 fullpath = NULL; 446 vn_fullpath(td, vp, &fullpath, &freepath); 447 vn_lock(vp, LK_SHARED | LK_RETRY); 448 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 449 pve->pve_fileid = vattr.va_fileid; 450 pve->pve_fsid = vattr.va_fsid; 451 } 452 vput(vp); 453 454 if (fullpath != NULL) { 455 pve->pve_pathlen = strlen(fullpath) + 1; 456 if (pve->pve_pathlen <= pathlen) { 457 error = copyout(fullpath, pve->pve_path, 458 pve->pve_pathlen); 459 } else 460 error = ENAMETOOLONG; 461 } 462 if (freepath != NULL) 463 free(freepath, M_TEMP); 464 } 465 } 466 vmspace_free(vm); 467 if (error == 0) 468 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 469 p->p_pid, pve->pve_entry, pve->pve_start); 470 471 return (error); 472 } 473 474 #ifdef COMPAT_FREEBSD32 475 static int 476 ptrace_vm_entry32(struct thread *td, struct proc *p, 477 struct ptrace_vm_entry32 *pve32) 478 { 479 struct ptrace_vm_entry pve; 480 int error; 481 482 pve.pve_entry = pve32->pve_entry; 483 pve.pve_pathlen = pve32->pve_pathlen; 484 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 485 486 error = ptrace_vm_entry(td, p, &pve); 487 if (error == 0) { 488 pve32->pve_entry = pve.pve_entry; 489 pve32->pve_timestamp = pve.pve_timestamp; 490 pve32->pve_start = pve.pve_start; 491 pve32->pve_end = pve.pve_end; 492 pve32->pve_offset = pve.pve_offset; 493 pve32->pve_prot = pve.pve_prot; 494 pve32->pve_fileid = pve.pve_fileid; 495 pve32->pve_fsid = pve.pve_fsid; 496 } 497 498 pve32->pve_pathlen = pve.pve_pathlen; 499 return (error); 500 } 501 502 static void 503 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 504 struct ptrace_lwpinfo32 *pl32) 505 { 506 507 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_ 525 struct 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 BZERO(a, s) wrap32 ? \ 545 bzero(a ## 32, s ## 32) : \ 546 bzero(a, s) 547 #define COPYIN(u, k, s) wrap32 ? \ 548 copyin(u, k ## 32, s ## 32) : \ 549 copyin(u, k, s) 550 #define COPYOUT(k, u, s) wrap32 ? \ 551 copyout(k ## 32, u, s ## 32) : \ 552 copyout(k, u, s) 553 #else 554 #define BZERO(a, s) bzero(a, s) 555 #define COPYIN(u, k, s) copyin(u, k, s) 556 #define COPYOUT(k, u, s) copyout(k, u, s) 557 #endif 558 int 559 sys_ptrace(struct thread *td, struct ptrace_args *uap) 560 { 561 /* 562 * XXX this obfuscation is to reduce stack usage, but the register 563 * structs may be too large to put on the stack anyway. 564 */ 565 union { 566 struct ptrace_io_desc piod; 567 struct ptrace_lwpinfo pl; 568 struct ptrace_vm_entry pve; 569 struct dbreg dbreg; 570 struct fpreg fpreg; 571 struct reg reg; 572 #ifdef COMPAT_FREEBSD32 573 struct dbreg32 dbreg32; 574 struct fpreg32 fpreg32; 575 struct reg32 reg32; 576 struct ptrace_io_desc32 piod32; 577 struct ptrace_lwpinfo32 pl32; 578 struct ptrace_vm_entry32 pve32; 579 #endif 580 char args[sizeof(td->td_sa.args)]; 581 int ptevents; 582 } r; 583 void *addr; 584 int error = 0; 585 #ifdef COMPAT_FREEBSD32 586 int wrap32 = 0; 587 588 if (SV_CURPROC_FLAG(SV_ILP32)) 589 wrap32 = 1; 590 #endif 591 AUDIT_ARG_PID(uap->pid); 592 AUDIT_ARG_CMD(uap->req); 593 AUDIT_ARG_VALUE(uap->data); 594 addr = &r; 595 switch (uap->req) { 596 case PT_GET_EVENT_MASK: 597 case PT_LWPINFO: 598 case PT_GET_SC_ARGS: 599 break; 600 case PT_GETREGS: 601 BZERO(&r.reg, sizeof r.reg); 602 break; 603 case PT_GETFPREGS: 604 BZERO(&r.fpreg, sizeof r.fpreg); 605 break; 606 case PT_GETDBREGS: 607 BZERO(&r.dbreg, sizeof r.dbreg); 608 break; 609 case PT_SETREGS: 610 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 611 break; 612 case PT_SETFPREGS: 613 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 614 break; 615 case PT_SETDBREGS: 616 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 617 break; 618 case PT_SET_EVENT_MASK: 619 if (uap->data != sizeof(r.ptevents)) 620 error = EINVAL; 621 else 622 error = copyin(uap->addr, &r.ptevents, uap->data); 623 break; 624 case PT_IO: 625 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 626 break; 627 case PT_VM_ENTRY: 628 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 629 break; 630 default: 631 addr = uap->addr; 632 break; 633 } 634 if (error) 635 return (error); 636 637 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 638 if (error) 639 return (error); 640 641 switch (uap->req) { 642 case PT_VM_ENTRY: 643 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 644 break; 645 case PT_IO: 646 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 647 break; 648 case PT_GETREGS: 649 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 650 break; 651 case PT_GETFPREGS: 652 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 653 break; 654 case PT_GETDBREGS: 655 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 656 break; 657 case PT_GET_EVENT_MASK: 658 /* NB: The size in uap->data is validated in kern_ptrace(). */ 659 error = copyout(&r.ptevents, uap->addr, uap->data); 660 break; 661 case PT_LWPINFO: 662 /* NB: The size in uap->data is validated in kern_ptrace(). */ 663 error = copyout(&r.pl, uap->addr, uap->data); 664 break; 665 case PT_GET_SC_ARGS: 666 error = copyout(r.args, uap->addr, MIN(uap->data, 667 sizeof(r.args))); 668 break; 669 } 670 671 return (error); 672 } 673 #undef COPYIN 674 #undef COPYOUT 675 #undef BZERO 676 677 #ifdef COMPAT_FREEBSD32 678 /* 679 * PROC_READ(regs, td2, addr); 680 * becomes either: 681 * proc_read_regs(td2, addr); 682 * or 683 * proc_read_regs32(td2, addr); 684 * .. except this is done at runtime. There is an additional 685 * complication in that PROC_WRITE disallows 32 bit consumers 686 * from writing to 64 bit address space targets. 687 */ 688 #define PROC_READ(w, t, a) wrap32 ? \ 689 proc_read_ ## w ## 32(t, a) : \ 690 proc_read_ ## w (t, a) 691 #define PROC_WRITE(w, t, a) wrap32 ? \ 692 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 693 proc_write_ ## w (t, a) 694 #else 695 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 696 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 697 #endif 698 699 void 700 proc_set_traced(struct proc *p, bool stop) 701 { 702 703 sx_assert(&proctree_lock, SX_XLOCKED); 704 PROC_LOCK_ASSERT(p, MA_OWNED); 705 p->p_flag |= P_TRACED; 706 if (stop) 707 p->p_flag2 |= P2_PTRACE_FSTP; 708 p->p_ptevents = PTRACE_DEFAULT; 709 p->p_oppid = p->p_pptr->p_pid; 710 } 711 712 int 713 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 714 { 715 struct iovec iov; 716 struct uio uio; 717 struct proc *curp, *p, *pp; 718 struct thread *td2 = NULL, *td3; 719 struct ptrace_io_desc *piod = NULL; 720 struct ptrace_lwpinfo *pl; 721 int error, num, tmp; 722 int proctree_locked = 0; 723 lwpid_t tid = 0, *buf; 724 #ifdef COMPAT_FREEBSD32 725 int wrap32 = 0, safe = 0; 726 struct ptrace_io_desc32 *piod32 = NULL; 727 struct ptrace_lwpinfo32 *pl32 = NULL; 728 struct ptrace_lwpinfo plr; 729 #endif 730 731 curp = td->td_proc; 732 733 /* Lock proctree before locking the process. */ 734 switch (req) { 735 case PT_TRACE_ME: 736 case PT_ATTACH: 737 case PT_STEP: 738 case PT_CONTINUE: 739 case PT_TO_SCE: 740 case PT_TO_SCX: 741 case PT_SYSCALL: 742 case PT_FOLLOW_FORK: 743 case PT_LWP_EVENTS: 744 case PT_GET_EVENT_MASK: 745 case PT_SET_EVENT_MASK: 746 case PT_DETACH: 747 case PT_GET_SC_ARGS: 748 sx_xlock(&proctree_lock); 749 proctree_locked = 1; 750 break; 751 default: 752 break; 753 } 754 755 if (req == PT_TRACE_ME) { 756 p = td->td_proc; 757 PROC_LOCK(p); 758 } else { 759 if (pid <= PID_MAX) { 760 if ((p = pfind(pid)) == NULL) { 761 if (proctree_locked) 762 sx_xunlock(&proctree_lock); 763 return (ESRCH); 764 } 765 } else { 766 td2 = tdfind(pid, -1); 767 if (td2 == NULL) { 768 if (proctree_locked) 769 sx_xunlock(&proctree_lock); 770 return (ESRCH); 771 } 772 p = td2->td_proc; 773 tid = pid; 774 pid = p->p_pid; 775 } 776 } 777 AUDIT_ARG_PROCESS(p); 778 779 if ((p->p_flag & P_WEXIT) != 0) { 780 error = ESRCH; 781 goto fail; 782 } 783 if ((error = p_cansee(td, p)) != 0) 784 goto fail; 785 786 if ((error = p_candebug(td, p)) != 0) 787 goto fail; 788 789 /* 790 * System processes can't be debugged. 791 */ 792 if ((p->p_flag & P_SYSTEM) != 0) { 793 error = EINVAL; 794 goto fail; 795 } 796 797 if (tid == 0) { 798 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 799 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 800 td2 = p->p_xthread; 801 } else { 802 td2 = FIRST_THREAD_IN_PROC(p); 803 } 804 tid = td2->td_tid; 805 } 806 807 #ifdef COMPAT_FREEBSD32 808 /* 809 * Test if we're a 32 bit client and what the target is. 810 * Set the wrap controls accordingly. 811 */ 812 if (SV_CURPROC_FLAG(SV_ILP32)) { 813 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 814 safe = 1; 815 wrap32 = 1; 816 } 817 #endif 818 /* 819 * Permissions check 820 */ 821 switch (req) { 822 case PT_TRACE_ME: 823 /* 824 * Always legal, when there is a parent process which 825 * could trace us. Otherwise, reject. 826 */ 827 if ((p->p_flag & P_TRACED) != 0) { 828 error = EBUSY; 829 goto fail; 830 } 831 if (p->p_pptr == initproc) { 832 error = EPERM; 833 goto fail; 834 } 835 break; 836 837 case PT_ATTACH: 838 /* Self */ 839 if (p == td->td_proc) { 840 error = EINVAL; 841 goto fail; 842 } 843 844 /* Already traced */ 845 if (p->p_flag & P_TRACED) { 846 error = EBUSY; 847 goto fail; 848 } 849 850 /* Can't trace an ancestor if you're being traced. */ 851 if (curp->p_flag & P_TRACED) { 852 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 853 if (pp == p) { 854 error = EINVAL; 855 goto fail; 856 } 857 } 858 } 859 860 861 /* OK */ 862 break; 863 864 case PT_CLEARSTEP: 865 /* Allow thread to clear single step for itself */ 866 if (td->td_tid == tid) 867 break; 868 869 /* FALLTHROUGH */ 870 default: 871 /* not being traced... */ 872 if ((p->p_flag & P_TRACED) == 0) { 873 error = EPERM; 874 goto fail; 875 } 876 877 /* not being traced by YOU */ 878 if (p->p_pptr != td->td_proc) { 879 error = EBUSY; 880 goto fail; 881 } 882 883 /* not currently stopped */ 884 if ((p->p_flag & P_STOPPED_TRACE) == 0 || 885 p->p_suspcount != p->p_numthreads || 886 (p->p_flag & P_WAITED) == 0) { 887 error = EBUSY; 888 goto fail; 889 } 890 891 /* OK */ 892 break; 893 } 894 895 /* Keep this process around until we finish this request. */ 896 _PHOLD(p); 897 898 #ifdef FIX_SSTEP 899 /* 900 * Single step fixup ala procfs 901 */ 902 FIX_SSTEP(td2); 903 #endif 904 905 /* 906 * Actually do the requests 907 */ 908 909 td->td_retval[0] = 0; 910 911 switch (req) { 912 case PT_TRACE_ME: 913 /* set my trace flag and "owner" so it can read/write me */ 914 proc_set_traced(p, false); 915 if (p->p_flag & P_PPWAIT) 916 p->p_flag |= P_PPTRACE; 917 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 918 break; 919 920 case PT_ATTACH: 921 /* security check done above */ 922 /* 923 * It would be nice if the tracing relationship was separate 924 * from the parent relationship but that would require 925 * another set of links in the proc struct or for "wait" 926 * to scan the entire proc table. To make life easier, 927 * we just re-parent the process we're trying to trace. 928 * The old parent is remembered so we can put things back 929 * on a "detach". 930 */ 931 proc_set_traced(p, true); 932 if (p->p_pptr != td->td_proc) { 933 proc_reparent(p, td->td_proc); 934 } 935 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 936 p->p_oppid); 937 938 sx_xunlock(&proctree_lock); 939 proctree_locked = 0; 940 MPASS(p->p_xthread == NULL); 941 MPASS((p->p_flag & P_STOPPED_TRACE) == 0); 942 943 /* 944 * If already stopped due to a stop signal, clear the 945 * existing stop before triggering a traced SIGSTOP. 946 */ 947 if ((p->p_flag & P_STOPPED_SIG) != 0) { 948 PROC_SLOCK(p); 949 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED); 950 thread_unsuspend(p); 951 PROC_SUNLOCK(p); 952 } 953 954 kern_psignal(p, SIGSTOP); 955 break; 956 957 case PT_CLEARSTEP: 958 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 959 p->p_pid); 960 error = ptrace_clear_single_step(td2); 961 break; 962 963 case PT_SETSTEP: 964 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 965 p->p_pid); 966 error = ptrace_single_step(td2); 967 break; 968 969 case PT_SUSPEND: 970 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 971 p->p_pid); 972 td2->td_dbgflags |= TDB_SUSPEND; 973 thread_lock(td2); 974 td2->td_flags |= TDF_NEEDSUSPCHK; 975 thread_unlock(td2); 976 break; 977 978 case PT_RESUME: 979 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 980 p->p_pid); 981 td2->td_dbgflags &= ~TDB_SUSPEND; 982 break; 983 984 case PT_FOLLOW_FORK: 985 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 986 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 987 data ? "enabled" : "disabled"); 988 if (data) 989 p->p_ptevents |= PTRACE_FORK; 990 else 991 p->p_ptevents &= ~PTRACE_FORK; 992 break; 993 994 case PT_LWP_EVENTS: 995 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 996 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 997 data ? "enabled" : "disabled"); 998 if (data) 999 p->p_ptevents |= PTRACE_LWP; 1000 else 1001 p->p_ptevents &= ~PTRACE_LWP; 1002 break; 1003 1004 case PT_GET_EVENT_MASK: 1005 if (data != sizeof(p->p_ptevents)) { 1006 error = EINVAL; 1007 break; 1008 } 1009 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 1010 p->p_ptevents); 1011 *(int *)addr = p->p_ptevents; 1012 break; 1013 1014 case PT_SET_EVENT_MASK: 1015 if (data != sizeof(p->p_ptevents)) { 1016 error = EINVAL; 1017 break; 1018 } 1019 tmp = *(int *)addr; 1020 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 1021 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 1022 error = EINVAL; 1023 break; 1024 } 1025 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1026 p->p_pid, p->p_ptevents, tmp); 1027 p->p_ptevents = tmp; 1028 break; 1029 1030 case PT_GET_SC_ARGS: 1031 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1032 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1033 #ifdef COMPAT_FREEBSD32 1034 || (wrap32 && !safe) 1035 #endif 1036 ) { 1037 error = EINVAL; 1038 break; 1039 } 1040 bzero(addr, sizeof(td2->td_sa.args)); 1041 #ifdef COMPAT_FREEBSD32 1042 if (wrap32) 1043 for (num = 0; num < nitems(td2->td_sa.args); num++) 1044 ((uint32_t *)addr)[num] = (uint32_t) 1045 td2->td_sa.args[num]; 1046 else 1047 #endif 1048 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1049 sizeof(register_t)); 1050 break; 1051 1052 case PT_STEP: 1053 case PT_CONTINUE: 1054 case PT_TO_SCE: 1055 case PT_TO_SCX: 1056 case PT_SYSCALL: 1057 case PT_DETACH: 1058 /* Zero means do not send any signal */ 1059 if (data < 0 || data > _SIG_MAXSIG) { 1060 error = EINVAL; 1061 break; 1062 } 1063 1064 switch (req) { 1065 case PT_STEP: 1066 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1067 td2->td_tid, p->p_pid, data); 1068 error = ptrace_single_step(td2); 1069 if (error) 1070 goto out; 1071 break; 1072 case PT_CONTINUE: 1073 case PT_TO_SCE: 1074 case PT_TO_SCX: 1075 case PT_SYSCALL: 1076 if (addr != (void *)1) { 1077 error = ptrace_set_pc(td2, 1078 (u_long)(uintfptr_t)addr); 1079 if (error) 1080 goto out; 1081 } 1082 switch (req) { 1083 case PT_TO_SCE: 1084 p->p_ptevents |= PTRACE_SCE; 1085 CTR4(KTR_PTRACE, 1086 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1087 p->p_pid, p->p_ptevents, 1088 (u_long)(uintfptr_t)addr, data); 1089 break; 1090 case PT_TO_SCX: 1091 p->p_ptevents |= PTRACE_SCX; 1092 CTR4(KTR_PTRACE, 1093 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1094 p->p_pid, p->p_ptevents, 1095 (u_long)(uintfptr_t)addr, data); 1096 break; 1097 case PT_SYSCALL: 1098 p->p_ptevents |= PTRACE_SYSCALL; 1099 CTR4(KTR_PTRACE, 1100 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1101 p->p_pid, p->p_ptevents, 1102 (u_long)(uintfptr_t)addr, data); 1103 break; 1104 case PT_CONTINUE: 1105 CTR3(KTR_PTRACE, 1106 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1107 p->p_pid, (u_long)(uintfptr_t)addr, data); 1108 break; 1109 } 1110 break; 1111 case PT_DETACH: 1112 /* 1113 * Reset the process parent. 1114 * 1115 * NB: This clears P_TRACED before reparenting 1116 * a detached process back to its original 1117 * parent. Otherwise the debugee will be set 1118 * as an orphan of the debugger. 1119 */ 1120 p->p_flag &= ~(P_TRACED | P_WAITED); 1121 if (p->p_oppid != p->p_pptr->p_pid) { 1122 PROC_LOCK(p->p_pptr); 1123 sigqueue_take(p->p_ksi); 1124 PROC_UNLOCK(p->p_pptr); 1125 1126 pp = proc_realparent(p); 1127 proc_reparent(p, pp); 1128 if (pp == initproc) 1129 p->p_sigparent = SIGCHLD; 1130 CTR3(KTR_PTRACE, 1131 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1132 p->p_pid, pp->p_pid, data); 1133 } else 1134 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1135 p->p_pid, data); 1136 p->p_oppid = 0; 1137 p->p_ptevents = 0; 1138 FOREACH_THREAD_IN_PROC(p, td3) { 1139 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1140 sigqueue_delete(&td3->td_sigqueue, 1141 SIGSTOP); 1142 } 1143 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP | 1144 TDB_SUSPEND); 1145 } 1146 1147 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1148 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1149 p->p_flag2 &= ~P2_PTRACE_FSTP; 1150 } 1151 1152 /* should we send SIGCHLD? */ 1153 /* childproc_continued(p); */ 1154 break; 1155 } 1156 1157 sx_xunlock(&proctree_lock); 1158 proctree_locked = 0; 1159 1160 sendsig: 1161 MPASS(proctree_locked == 0); 1162 1163 /* 1164 * Clear the pending event for the thread that just 1165 * reported its event (p_xthread). This may not be 1166 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1167 * the debugger is resuming a different thread. 1168 * 1169 * Deliver any pending signal via the reporting thread. 1170 */ 1171 MPASS(p->p_xthread != NULL); 1172 p->p_xthread->td_dbgflags &= ~TDB_XSIG; 1173 p->p_xthread->td_xsig = data; 1174 p->p_xthread = NULL; 1175 p->p_xsig = data; 1176 1177 /* 1178 * P_WKILLED is insurance that a PT_KILL/SIGKILL 1179 * always works immediately, even if another thread is 1180 * unsuspended first and attempts to handle a 1181 * different signal or if the POSIX.1b style signal 1182 * queue cannot accommodate any new signals. 1183 */ 1184 if (data == SIGKILL) 1185 proc_wkilled(p); 1186 1187 /* 1188 * Unsuspend all threads. To leave a thread 1189 * suspended, use PT_SUSPEND to suspend it before 1190 * continuing the process. 1191 */ 1192 PROC_SLOCK(p); 1193 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED); 1194 thread_unsuspend(p); 1195 PROC_SUNLOCK(p); 1196 break; 1197 1198 case PT_WRITE_I: 1199 case PT_WRITE_D: 1200 td2->td_dbgflags |= TDB_USERWR; 1201 PROC_UNLOCK(p); 1202 error = 0; 1203 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1204 sizeof(int)) != sizeof(int)) 1205 error = ENOMEM; 1206 else 1207 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1208 p->p_pid, addr, data); 1209 PROC_LOCK(p); 1210 break; 1211 1212 case PT_READ_I: 1213 case PT_READ_D: 1214 PROC_UNLOCK(p); 1215 error = tmp = 0; 1216 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1217 sizeof(int)) != sizeof(int)) 1218 error = ENOMEM; 1219 else 1220 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1221 p->p_pid, addr, tmp); 1222 td->td_retval[0] = tmp; 1223 PROC_LOCK(p); 1224 break; 1225 1226 case PT_IO: 1227 #ifdef COMPAT_FREEBSD32 1228 if (wrap32) { 1229 piod32 = addr; 1230 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1231 iov.iov_len = piod32->piod_len; 1232 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1233 uio.uio_resid = piod32->piod_len; 1234 } else 1235 #endif 1236 { 1237 piod = addr; 1238 iov.iov_base = piod->piod_addr; 1239 iov.iov_len = piod->piod_len; 1240 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1241 uio.uio_resid = piod->piod_len; 1242 } 1243 uio.uio_iov = &iov; 1244 uio.uio_iovcnt = 1; 1245 uio.uio_segflg = UIO_USERSPACE; 1246 uio.uio_td = td; 1247 #ifdef COMPAT_FREEBSD32 1248 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1249 #else 1250 tmp = piod->piod_op; 1251 #endif 1252 switch (tmp) { 1253 case PIOD_READ_D: 1254 case PIOD_READ_I: 1255 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1256 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1257 uio.uio_rw = UIO_READ; 1258 break; 1259 case PIOD_WRITE_D: 1260 case PIOD_WRITE_I: 1261 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1262 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1263 td2->td_dbgflags |= TDB_USERWR; 1264 uio.uio_rw = UIO_WRITE; 1265 break; 1266 default: 1267 error = EINVAL; 1268 goto out; 1269 } 1270 PROC_UNLOCK(p); 1271 error = proc_rwmem(p, &uio); 1272 #ifdef COMPAT_FREEBSD32 1273 if (wrap32) 1274 piod32->piod_len -= uio.uio_resid; 1275 else 1276 #endif 1277 piod->piod_len -= uio.uio_resid; 1278 PROC_LOCK(p); 1279 break; 1280 1281 case PT_KILL: 1282 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1283 data = SIGKILL; 1284 goto sendsig; /* in PT_CONTINUE above */ 1285 1286 case PT_SETREGS: 1287 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1288 p->p_pid); 1289 td2->td_dbgflags |= TDB_USERWR; 1290 error = PROC_WRITE(regs, td2, addr); 1291 break; 1292 1293 case PT_GETREGS: 1294 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1295 p->p_pid); 1296 error = PROC_READ(regs, td2, addr); 1297 break; 1298 1299 case PT_SETFPREGS: 1300 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1301 p->p_pid); 1302 td2->td_dbgflags |= TDB_USERWR; 1303 error = PROC_WRITE(fpregs, td2, addr); 1304 break; 1305 1306 case PT_GETFPREGS: 1307 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1308 p->p_pid); 1309 error = PROC_READ(fpregs, td2, addr); 1310 break; 1311 1312 case PT_SETDBREGS: 1313 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1314 p->p_pid); 1315 td2->td_dbgflags |= TDB_USERWR; 1316 error = PROC_WRITE(dbregs, td2, addr); 1317 break; 1318 1319 case PT_GETDBREGS: 1320 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1321 p->p_pid); 1322 error = PROC_READ(dbregs, td2, addr); 1323 break; 1324 1325 case PT_LWPINFO: 1326 if (data <= 0 || 1327 #ifdef COMPAT_FREEBSD32 1328 (!wrap32 && data > sizeof(*pl)) || 1329 (wrap32 && data > sizeof(*pl32))) { 1330 #else 1331 data > sizeof(*pl)) { 1332 #endif 1333 error = EINVAL; 1334 break; 1335 } 1336 #ifdef COMPAT_FREEBSD32 1337 if (wrap32) { 1338 pl = &plr; 1339 pl32 = addr; 1340 } else 1341 #endif 1342 pl = addr; 1343 bzero(pl, sizeof(*pl)); 1344 pl->pl_lwpid = td2->td_tid; 1345 pl->pl_event = PL_EVENT_NONE; 1346 pl->pl_flags = 0; 1347 if (td2->td_dbgflags & TDB_XSIG) { 1348 pl->pl_event = PL_EVENT_SIGNAL; 1349 if (td2->td_si.si_signo != 0 && 1350 #ifdef COMPAT_FREEBSD32 1351 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1352 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1353 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1354 pl_siginfo) + sizeof(struct siginfo32))) 1355 #else 1356 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1357 + sizeof(pl->pl_siginfo) 1358 #endif 1359 ){ 1360 pl->pl_flags |= PL_FLAG_SI; 1361 pl->pl_siginfo = td2->td_si; 1362 } 1363 } 1364 if (td2->td_dbgflags & TDB_SCE) 1365 pl->pl_flags |= PL_FLAG_SCE; 1366 else if (td2->td_dbgflags & TDB_SCX) 1367 pl->pl_flags |= PL_FLAG_SCX; 1368 if (td2->td_dbgflags & TDB_EXEC) 1369 pl->pl_flags |= PL_FLAG_EXEC; 1370 if (td2->td_dbgflags & TDB_FORK) { 1371 pl->pl_flags |= PL_FLAG_FORKED; 1372 pl->pl_child_pid = td2->td_dbg_forked; 1373 if (td2->td_dbgflags & TDB_VFORK) 1374 pl->pl_flags |= PL_FLAG_VFORKED; 1375 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1376 TDB_VFORK) 1377 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1378 if (td2->td_dbgflags & TDB_CHILD) 1379 pl->pl_flags |= PL_FLAG_CHILD; 1380 if (td2->td_dbgflags & TDB_BORN) 1381 pl->pl_flags |= PL_FLAG_BORN; 1382 if (td2->td_dbgflags & TDB_EXIT) 1383 pl->pl_flags |= PL_FLAG_EXITED; 1384 pl->pl_sigmask = td2->td_sigmask; 1385 pl->pl_siglist = td2->td_siglist; 1386 strcpy(pl->pl_tdname, td2->td_name); 1387 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1388 pl->pl_syscall_code = td2->td_sa.code; 1389 pl->pl_syscall_narg = td2->td_sa.narg; 1390 } else { 1391 pl->pl_syscall_code = 0; 1392 pl->pl_syscall_narg = 0; 1393 } 1394 #ifdef COMPAT_FREEBSD32 1395 if (wrap32) 1396 ptrace_lwpinfo_to32(pl, pl32); 1397 #endif 1398 CTR6(KTR_PTRACE, 1399 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1400 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1401 pl->pl_child_pid, pl->pl_syscall_code); 1402 break; 1403 1404 case PT_GETNUMLWPS: 1405 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1406 p->p_numthreads); 1407 td->td_retval[0] = p->p_numthreads; 1408 break; 1409 1410 case PT_GETLWPLIST: 1411 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1412 p->p_pid, data, p->p_numthreads); 1413 if (data <= 0) { 1414 error = EINVAL; 1415 break; 1416 } 1417 num = imin(p->p_numthreads, data); 1418 PROC_UNLOCK(p); 1419 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1420 tmp = 0; 1421 PROC_LOCK(p); 1422 FOREACH_THREAD_IN_PROC(p, td2) { 1423 if (tmp >= num) 1424 break; 1425 buf[tmp++] = td2->td_tid; 1426 } 1427 PROC_UNLOCK(p); 1428 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1429 free(buf, M_TEMP); 1430 if (!error) 1431 td->td_retval[0] = tmp; 1432 PROC_LOCK(p); 1433 break; 1434 1435 case PT_VM_TIMESTAMP: 1436 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1437 p->p_pid, p->p_vmspace->vm_map.timestamp); 1438 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1439 break; 1440 1441 case PT_VM_ENTRY: 1442 PROC_UNLOCK(p); 1443 #ifdef COMPAT_FREEBSD32 1444 if (wrap32) 1445 error = ptrace_vm_entry32(td, p, addr); 1446 else 1447 #endif 1448 error = ptrace_vm_entry(td, p, addr); 1449 PROC_LOCK(p); 1450 break; 1451 1452 default: 1453 #ifdef __HAVE_PTRACE_MACHDEP 1454 if (req >= PT_FIRSTMACH) { 1455 PROC_UNLOCK(p); 1456 error = cpu_ptrace(td2, req, addr, data); 1457 PROC_LOCK(p); 1458 } else 1459 #endif 1460 /* Unknown request. */ 1461 error = EINVAL; 1462 break; 1463 } 1464 1465 out: 1466 /* Drop our hold on this process now that the request has completed. */ 1467 _PRELE(p); 1468 fail: 1469 PROC_UNLOCK(p); 1470 if (proctree_locked) 1471 sx_xunlock(&proctree_lock); 1472 return (error); 1473 } 1474 #undef PROC_READ 1475 #undef PROC_WRITE 1476 1477 /* 1478 * Stop a process because of a debugging event; 1479 * stay stopped until p->p_step is cleared 1480 * (cleared by PIOCCONT in procfs). 1481 */ 1482 void 1483 stopevent(struct proc *p, unsigned int event, unsigned int val) 1484 { 1485 1486 PROC_LOCK_ASSERT(p, MA_OWNED); 1487 p->p_step = 1; 1488 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1489 val); 1490 do { 1491 if (event != S_EXIT) 1492 p->p_xsig = val; 1493 p->p_xthread = NULL; 1494 p->p_stype = event; /* Which event caused the stop? */ 1495 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1496 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1497 } while (p->p_step); 1498 }
Cache object: f8e4d2f672dd4b49fe3a7eaf9947617b
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