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: releng/11.2/sys/kern/sys_process.c 342224 2018-12-19 17:52:56Z emaste $"); 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 COPYIN(u, k, s) wrap32 ? \ 545 copyin(u, k ## 32, s ## 32) : \ 546 copyin(u, k, s) 547 #define COPYOUT(k, u, s) wrap32 ? \ 548 copyout(k ## 32, u, s ## 32) : \ 549 copyout(k, u, s) 550 #else 551 #define COPYIN(u, k, s) copyin(u, k, s) 552 #define COPYOUT(k, u, s) copyout(k, u, s) 553 #endif 554 int 555 sys_ptrace(struct thread *td, struct ptrace_args *uap) 556 { 557 /* 558 * XXX this obfuscation is to reduce stack usage, but the register 559 * structs may be too large to put on the stack anyway. 560 */ 561 union { 562 struct ptrace_io_desc piod; 563 struct ptrace_lwpinfo pl; 564 struct ptrace_vm_entry pve; 565 struct dbreg dbreg; 566 struct fpreg fpreg; 567 struct reg reg; 568 #ifdef COMPAT_FREEBSD32 569 struct dbreg32 dbreg32; 570 struct fpreg32 fpreg32; 571 struct reg32 reg32; 572 struct ptrace_io_desc32 piod32; 573 struct ptrace_lwpinfo32 pl32; 574 struct ptrace_vm_entry32 pve32; 575 #endif 576 char args[nitems(td->td_sa.args) * sizeof(register_t)]; 577 int ptevents; 578 } r; 579 void *addr; 580 int error = 0; 581 #ifdef COMPAT_FREEBSD32 582 int wrap32 = 0; 583 584 if (SV_CURPROC_FLAG(SV_ILP32)) 585 wrap32 = 1; 586 #endif 587 AUDIT_ARG_PID(uap->pid); 588 AUDIT_ARG_CMD(uap->req); 589 AUDIT_ARG_VALUE(uap->data); 590 addr = &r; 591 switch (uap->req) { 592 case PT_GET_EVENT_MASK: 593 case PT_GETREGS: 594 case PT_GETFPREGS: 595 case PT_GETDBREGS: 596 case PT_LWPINFO: 597 case PT_GET_SC_ARGS: 598 break; 599 case PT_SETREGS: 600 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 601 break; 602 case PT_SETFPREGS: 603 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 604 break; 605 case PT_SETDBREGS: 606 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 607 break; 608 case PT_SET_EVENT_MASK: 609 if (uap->data != sizeof(r.ptevents)) 610 error = EINVAL; 611 else 612 error = copyin(uap->addr, &r.ptevents, uap->data); 613 break; 614 case PT_IO: 615 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 616 break; 617 case PT_VM_ENTRY: 618 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 619 break; 620 default: 621 addr = uap->addr; 622 break; 623 } 624 if (error) 625 return (error); 626 627 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 628 if (error) 629 return (error); 630 631 switch (uap->req) { 632 case PT_VM_ENTRY: 633 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 634 break; 635 case PT_IO: 636 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 637 break; 638 case PT_GETREGS: 639 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 640 break; 641 case PT_GETFPREGS: 642 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 643 break; 644 case PT_GETDBREGS: 645 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 646 break; 647 case PT_GET_EVENT_MASK: 648 /* NB: The size in uap->data is validated in kern_ptrace(). */ 649 error = copyout(&r.ptevents, uap->addr, uap->data); 650 break; 651 case PT_LWPINFO: 652 /* NB: The size in uap->data is validated in kern_ptrace(). */ 653 error = copyout(&r.pl, uap->addr, uap->data); 654 break; 655 case PT_GET_SC_ARGS: 656 error = copyout(r.args, uap->addr, MIN(uap->data, 657 sizeof(r.args))); 658 break; 659 } 660 661 return (error); 662 } 663 #undef COPYIN 664 #undef COPYOUT 665 666 #ifdef COMPAT_FREEBSD32 667 /* 668 * PROC_READ(regs, td2, addr); 669 * becomes either: 670 * proc_read_regs(td2, addr); 671 * or 672 * proc_read_regs32(td2, addr); 673 * .. except this is done at runtime. There is an additional 674 * complication in that PROC_WRITE disallows 32 bit consumers 675 * from writing to 64 bit address space targets. 676 */ 677 #define PROC_READ(w, t, a) wrap32 ? \ 678 proc_read_ ## w ## 32(t, a) : \ 679 proc_read_ ## w (t, a) 680 #define PROC_WRITE(w, t, a) wrap32 ? \ 681 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 682 proc_write_ ## w (t, a) 683 #else 684 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 685 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 686 #endif 687 688 void 689 proc_set_traced(struct proc *p, bool stop) 690 { 691 692 PROC_LOCK_ASSERT(p, MA_OWNED); 693 p->p_flag |= P_TRACED; 694 if (stop) 695 p->p_flag2 |= P2_PTRACE_FSTP; 696 p->p_ptevents = PTRACE_DEFAULT; 697 p->p_oppid = p->p_pptr->p_pid; 698 } 699 700 int 701 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 702 { 703 struct iovec iov; 704 struct uio uio; 705 struct proc *curp, *p, *pp; 706 struct thread *td2 = NULL, *td3; 707 struct ptrace_io_desc *piod = NULL; 708 struct ptrace_lwpinfo *pl; 709 int error, num, tmp; 710 int proctree_locked = 0; 711 lwpid_t tid = 0, *buf; 712 #ifdef COMPAT_FREEBSD32 713 int wrap32 = 0, safe = 0; 714 struct ptrace_io_desc32 *piod32 = NULL; 715 struct ptrace_lwpinfo32 *pl32 = NULL; 716 struct ptrace_lwpinfo plr; 717 #endif 718 719 curp = td->td_proc; 720 721 /* Lock proctree before locking the process. */ 722 switch (req) { 723 case PT_TRACE_ME: 724 case PT_ATTACH: 725 case PT_STEP: 726 case PT_CONTINUE: 727 case PT_TO_SCE: 728 case PT_TO_SCX: 729 case PT_SYSCALL: 730 case PT_FOLLOW_FORK: 731 case PT_LWP_EVENTS: 732 case PT_GET_EVENT_MASK: 733 case PT_SET_EVENT_MASK: 734 case PT_DETACH: 735 case PT_GET_SC_ARGS: 736 sx_xlock(&proctree_lock); 737 proctree_locked = 1; 738 break; 739 default: 740 break; 741 } 742 743 if (req == PT_TRACE_ME) { 744 p = td->td_proc; 745 PROC_LOCK(p); 746 } else { 747 if (pid <= PID_MAX) { 748 if ((p = pfind(pid)) == NULL) { 749 if (proctree_locked) 750 sx_xunlock(&proctree_lock); 751 return (ESRCH); 752 } 753 } else { 754 td2 = tdfind(pid, -1); 755 if (td2 == NULL) { 756 if (proctree_locked) 757 sx_xunlock(&proctree_lock); 758 return (ESRCH); 759 } 760 p = td2->td_proc; 761 tid = pid; 762 pid = p->p_pid; 763 } 764 } 765 AUDIT_ARG_PROCESS(p); 766 767 if ((p->p_flag & P_WEXIT) != 0) { 768 error = ESRCH; 769 goto fail; 770 } 771 if ((error = p_cansee(td, p)) != 0) 772 goto fail; 773 774 if ((error = p_candebug(td, p)) != 0) 775 goto fail; 776 777 /* 778 * System processes can't be debugged. 779 */ 780 if ((p->p_flag & P_SYSTEM) != 0) { 781 error = EINVAL; 782 goto fail; 783 } 784 785 if (tid == 0) { 786 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 787 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 788 td2 = p->p_xthread; 789 } else { 790 td2 = FIRST_THREAD_IN_PROC(p); 791 } 792 tid = td2->td_tid; 793 } 794 795 #ifdef COMPAT_FREEBSD32 796 /* 797 * Test if we're a 32 bit client and what the target is. 798 * Set the wrap controls accordingly. 799 */ 800 if (SV_CURPROC_FLAG(SV_ILP32)) { 801 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 802 safe = 1; 803 wrap32 = 1; 804 } 805 #endif 806 /* 807 * Permissions check 808 */ 809 switch (req) { 810 case PT_TRACE_ME: 811 /* 812 * Always legal, when there is a parent process which 813 * could trace us. Otherwise, reject. 814 */ 815 if ((p->p_flag & P_TRACED) != 0) { 816 error = EBUSY; 817 goto fail; 818 } 819 if (p->p_pptr == initproc) { 820 error = EPERM; 821 goto fail; 822 } 823 break; 824 825 case PT_ATTACH: 826 /* Self */ 827 if (p == td->td_proc) { 828 error = EINVAL; 829 goto fail; 830 } 831 832 /* Already traced */ 833 if (p->p_flag & P_TRACED) { 834 error = EBUSY; 835 goto fail; 836 } 837 838 /* Can't trace an ancestor if you're being traced. */ 839 if (curp->p_flag & P_TRACED) { 840 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 841 if (pp == p) { 842 error = EINVAL; 843 goto fail; 844 } 845 } 846 } 847 848 849 /* OK */ 850 break; 851 852 case PT_CLEARSTEP: 853 /* Allow thread to clear single step for itself */ 854 if (td->td_tid == tid) 855 break; 856 857 /* FALLTHROUGH */ 858 default: 859 /* not being traced... */ 860 if ((p->p_flag & P_TRACED) == 0) { 861 error = EPERM; 862 goto fail; 863 } 864 865 /* not being traced by YOU */ 866 if (p->p_pptr != td->td_proc) { 867 error = EBUSY; 868 goto fail; 869 } 870 871 /* not currently stopped */ 872 if ((p->p_flag & P_STOPPED_TRACE) == 0 || 873 p->p_suspcount != p->p_numthreads || 874 (p->p_flag & P_WAITED) == 0) { 875 error = EBUSY; 876 goto fail; 877 } 878 879 /* OK */ 880 break; 881 } 882 883 /* Keep this process around until we finish this request. */ 884 _PHOLD(p); 885 886 #ifdef FIX_SSTEP 887 /* 888 * Single step fixup ala procfs 889 */ 890 FIX_SSTEP(td2); 891 #endif 892 893 /* 894 * Actually do the requests 895 */ 896 897 td->td_retval[0] = 0; 898 899 switch (req) { 900 case PT_TRACE_ME: 901 /* set my trace flag and "owner" so it can read/write me */ 902 proc_set_traced(p, false); 903 if (p->p_flag & P_PPWAIT) 904 p->p_flag |= P_PPTRACE; 905 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 906 break; 907 908 case PT_ATTACH: 909 /* security check done above */ 910 /* 911 * It would be nice if the tracing relationship was separate 912 * from the parent relationship but that would require 913 * another set of links in the proc struct or for "wait" 914 * to scan the entire proc table. To make life easier, 915 * we just re-parent the process we're trying to trace. 916 * The old parent is remembered so we can put things back 917 * on a "detach". 918 */ 919 proc_set_traced(p, true); 920 if (p->p_pptr != td->td_proc) { 921 proc_reparent(p, td->td_proc); 922 } 923 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 924 p->p_oppid); 925 926 sx_xunlock(&proctree_lock); 927 proctree_locked = 0; 928 MPASS(p->p_xthread == NULL); 929 MPASS((p->p_flag & P_STOPPED_TRACE) == 0); 930 931 /* 932 * If already stopped due to a stop signal, clear the 933 * existing stop before triggering a traced SIGSTOP. 934 */ 935 if ((p->p_flag & P_STOPPED_SIG) != 0) { 936 PROC_SLOCK(p); 937 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED); 938 thread_unsuspend(p); 939 PROC_SUNLOCK(p); 940 } 941 942 kern_psignal(p, SIGSTOP); 943 break; 944 945 case PT_CLEARSTEP: 946 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 947 p->p_pid); 948 error = ptrace_clear_single_step(td2); 949 break; 950 951 case PT_SETSTEP: 952 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 953 p->p_pid); 954 error = ptrace_single_step(td2); 955 break; 956 957 case PT_SUSPEND: 958 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 959 p->p_pid); 960 td2->td_dbgflags |= TDB_SUSPEND; 961 thread_lock(td2); 962 td2->td_flags |= TDF_NEEDSUSPCHK; 963 thread_unlock(td2); 964 break; 965 966 case PT_RESUME: 967 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 968 p->p_pid); 969 td2->td_dbgflags &= ~TDB_SUSPEND; 970 break; 971 972 case PT_FOLLOW_FORK: 973 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 974 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 975 data ? "enabled" : "disabled"); 976 if (data) 977 p->p_ptevents |= PTRACE_FORK; 978 else 979 p->p_ptevents &= ~PTRACE_FORK; 980 break; 981 982 case PT_LWP_EVENTS: 983 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 984 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 985 data ? "enabled" : "disabled"); 986 if (data) 987 p->p_ptevents |= PTRACE_LWP; 988 else 989 p->p_ptevents &= ~PTRACE_LWP; 990 break; 991 992 case PT_GET_EVENT_MASK: 993 if (data != sizeof(p->p_ptevents)) { 994 error = EINVAL; 995 break; 996 } 997 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 998 p->p_ptevents); 999 *(int *)addr = p->p_ptevents; 1000 break; 1001 1002 case PT_SET_EVENT_MASK: 1003 if (data != sizeof(p->p_ptevents)) { 1004 error = EINVAL; 1005 break; 1006 } 1007 tmp = *(int *)addr; 1008 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 1009 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 1010 error = EINVAL; 1011 break; 1012 } 1013 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1014 p->p_pid, p->p_ptevents, tmp); 1015 p->p_ptevents = tmp; 1016 break; 1017 1018 case PT_GET_SC_ARGS: 1019 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1020 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1021 #ifdef COMPAT_FREEBSD32 1022 || (wrap32 && !safe) 1023 #endif 1024 ) { 1025 error = EINVAL; 1026 break; 1027 } 1028 bzero(addr, sizeof(td2->td_sa.args)); 1029 #ifdef COMPAT_FREEBSD32 1030 if (wrap32) 1031 for (num = 0; num < nitems(td2->td_sa.args); num++) 1032 ((uint32_t *)addr)[num] = (uint32_t) 1033 td2->td_sa.args[num]; 1034 else 1035 #endif 1036 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1037 sizeof(register_t)); 1038 break; 1039 1040 case PT_STEP: 1041 case PT_CONTINUE: 1042 case PT_TO_SCE: 1043 case PT_TO_SCX: 1044 case PT_SYSCALL: 1045 case PT_DETACH: 1046 /* Zero means do not send any signal */ 1047 if (data < 0 || data > _SIG_MAXSIG) { 1048 error = EINVAL; 1049 break; 1050 } 1051 1052 switch (req) { 1053 case PT_STEP: 1054 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1055 td2->td_tid, p->p_pid, data); 1056 error = ptrace_single_step(td2); 1057 if (error) 1058 goto out; 1059 break; 1060 case PT_CONTINUE: 1061 case PT_TO_SCE: 1062 case PT_TO_SCX: 1063 case PT_SYSCALL: 1064 if (addr != (void *)1) { 1065 error = ptrace_set_pc(td2, 1066 (u_long)(uintfptr_t)addr); 1067 if (error) 1068 goto out; 1069 } 1070 switch (req) { 1071 case PT_TO_SCE: 1072 p->p_ptevents |= PTRACE_SCE; 1073 CTR4(KTR_PTRACE, 1074 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1075 p->p_pid, p->p_ptevents, 1076 (u_long)(uintfptr_t)addr, data); 1077 break; 1078 case PT_TO_SCX: 1079 p->p_ptevents |= PTRACE_SCX; 1080 CTR4(KTR_PTRACE, 1081 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1082 p->p_pid, p->p_ptevents, 1083 (u_long)(uintfptr_t)addr, data); 1084 break; 1085 case PT_SYSCALL: 1086 p->p_ptevents |= PTRACE_SYSCALL; 1087 CTR4(KTR_PTRACE, 1088 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1089 p->p_pid, p->p_ptevents, 1090 (u_long)(uintfptr_t)addr, data); 1091 break; 1092 case PT_CONTINUE: 1093 CTR3(KTR_PTRACE, 1094 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1095 p->p_pid, (u_long)(uintfptr_t)addr, data); 1096 break; 1097 } 1098 break; 1099 case PT_DETACH: 1100 /* 1101 * Reset the process parent. 1102 * 1103 * NB: This clears P_TRACED before reparenting 1104 * a detached process back to its original 1105 * parent. Otherwise the debugee will be set 1106 * as an orphan of the debugger. 1107 */ 1108 p->p_flag &= ~(P_TRACED | P_WAITED); 1109 if (p->p_oppid != p->p_pptr->p_pid) { 1110 PROC_LOCK(p->p_pptr); 1111 sigqueue_take(p->p_ksi); 1112 PROC_UNLOCK(p->p_pptr); 1113 1114 pp = proc_realparent(p); 1115 proc_reparent(p, pp); 1116 if (pp == initproc) 1117 p->p_sigparent = SIGCHLD; 1118 CTR3(KTR_PTRACE, 1119 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1120 p->p_pid, pp->p_pid, data); 1121 } else 1122 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1123 p->p_pid, data); 1124 p->p_oppid = 0; 1125 p->p_ptevents = 0; 1126 FOREACH_THREAD_IN_PROC(p, td3) { 1127 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1128 sigqueue_delete(&td3->td_sigqueue, 1129 SIGSTOP); 1130 } 1131 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP | 1132 TDB_SUSPEND); 1133 } 1134 1135 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1136 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1137 p->p_flag2 &= ~P2_PTRACE_FSTP; 1138 } 1139 1140 /* should we send SIGCHLD? */ 1141 /* childproc_continued(p); */ 1142 break; 1143 } 1144 1145 sx_xunlock(&proctree_lock); 1146 proctree_locked = 0; 1147 1148 sendsig: 1149 MPASS(proctree_locked == 0); 1150 1151 /* 1152 * Clear the pending event for the thread that just 1153 * reported its event (p_xthread). This may not be 1154 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1155 * the debugger is resuming a different thread. 1156 * 1157 * Deliver any pending signal via the reporting thread. 1158 */ 1159 MPASS(p->p_xthread != NULL); 1160 p->p_xthread->td_dbgflags &= ~TDB_XSIG; 1161 p->p_xthread->td_xsig = data; 1162 p->p_xthread = NULL; 1163 p->p_xsig = data; 1164 1165 /* 1166 * P_WKILLED is insurance that a PT_KILL/SIGKILL 1167 * always works immediately, even if another thread is 1168 * unsuspended first and attempts to handle a 1169 * different signal or if the POSIX.1b style signal 1170 * queue cannot accommodate any new signals. 1171 */ 1172 if (data == SIGKILL) 1173 p->p_flag |= P_WKILLED; 1174 1175 /* 1176 * Unsuspend all threads. To leave a thread 1177 * suspended, use PT_SUSPEND to suspend it before 1178 * continuing the process. 1179 */ 1180 PROC_SLOCK(p); 1181 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED); 1182 thread_unsuspend(p); 1183 PROC_SUNLOCK(p); 1184 break; 1185 1186 case PT_WRITE_I: 1187 case PT_WRITE_D: 1188 td2->td_dbgflags |= TDB_USERWR; 1189 PROC_UNLOCK(p); 1190 error = 0; 1191 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1192 sizeof(int)) != sizeof(int)) 1193 error = ENOMEM; 1194 else 1195 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1196 p->p_pid, addr, data); 1197 PROC_LOCK(p); 1198 break; 1199 1200 case PT_READ_I: 1201 case PT_READ_D: 1202 PROC_UNLOCK(p); 1203 error = tmp = 0; 1204 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1205 sizeof(int)) != sizeof(int)) 1206 error = ENOMEM; 1207 else 1208 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1209 p->p_pid, addr, tmp); 1210 td->td_retval[0] = tmp; 1211 PROC_LOCK(p); 1212 break; 1213 1214 case PT_IO: 1215 #ifdef COMPAT_FREEBSD32 1216 if (wrap32) { 1217 piod32 = addr; 1218 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1219 iov.iov_len = piod32->piod_len; 1220 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1221 uio.uio_resid = piod32->piod_len; 1222 } else 1223 #endif 1224 { 1225 piod = addr; 1226 iov.iov_base = piod->piod_addr; 1227 iov.iov_len = piod->piod_len; 1228 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1229 uio.uio_resid = piod->piod_len; 1230 } 1231 uio.uio_iov = &iov; 1232 uio.uio_iovcnt = 1; 1233 uio.uio_segflg = UIO_USERSPACE; 1234 uio.uio_td = td; 1235 #ifdef COMPAT_FREEBSD32 1236 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1237 #else 1238 tmp = piod->piod_op; 1239 #endif 1240 switch (tmp) { 1241 case PIOD_READ_D: 1242 case PIOD_READ_I: 1243 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1244 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1245 uio.uio_rw = UIO_READ; 1246 break; 1247 case PIOD_WRITE_D: 1248 case PIOD_WRITE_I: 1249 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1250 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1251 td2->td_dbgflags |= TDB_USERWR; 1252 uio.uio_rw = UIO_WRITE; 1253 break; 1254 default: 1255 error = EINVAL; 1256 goto out; 1257 } 1258 PROC_UNLOCK(p); 1259 error = proc_rwmem(p, &uio); 1260 #ifdef COMPAT_FREEBSD32 1261 if (wrap32) 1262 piod32->piod_len -= uio.uio_resid; 1263 else 1264 #endif 1265 piod->piod_len -= uio.uio_resid; 1266 PROC_LOCK(p); 1267 break; 1268 1269 case PT_KILL: 1270 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1271 data = SIGKILL; 1272 goto sendsig; /* in PT_CONTINUE above */ 1273 1274 case PT_SETREGS: 1275 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1276 p->p_pid); 1277 td2->td_dbgflags |= TDB_USERWR; 1278 error = PROC_WRITE(regs, td2, addr); 1279 break; 1280 1281 case PT_GETREGS: 1282 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1283 p->p_pid); 1284 error = PROC_READ(regs, td2, addr); 1285 break; 1286 1287 case PT_SETFPREGS: 1288 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1289 p->p_pid); 1290 td2->td_dbgflags |= TDB_USERWR; 1291 error = PROC_WRITE(fpregs, td2, addr); 1292 break; 1293 1294 case PT_GETFPREGS: 1295 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1296 p->p_pid); 1297 error = PROC_READ(fpregs, td2, addr); 1298 break; 1299 1300 case PT_SETDBREGS: 1301 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1302 p->p_pid); 1303 td2->td_dbgflags |= TDB_USERWR; 1304 error = PROC_WRITE(dbregs, td2, addr); 1305 break; 1306 1307 case PT_GETDBREGS: 1308 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1309 p->p_pid); 1310 error = PROC_READ(dbregs, td2, addr); 1311 break; 1312 1313 case PT_LWPINFO: 1314 if (data <= 0 || 1315 #ifdef COMPAT_FREEBSD32 1316 (!wrap32 && data > sizeof(*pl)) || 1317 (wrap32 && data > sizeof(*pl32))) { 1318 #else 1319 data > sizeof(*pl)) { 1320 #endif 1321 error = EINVAL; 1322 break; 1323 } 1324 #ifdef COMPAT_FREEBSD32 1325 if (wrap32) { 1326 pl = &plr; 1327 pl32 = addr; 1328 } else 1329 #endif 1330 pl = addr; 1331 bzero(pl, sizeof(*pl)); 1332 pl->pl_lwpid = td2->td_tid; 1333 pl->pl_event = PL_EVENT_NONE; 1334 pl->pl_flags = 0; 1335 if (td2->td_dbgflags & TDB_XSIG) { 1336 pl->pl_event = PL_EVENT_SIGNAL; 1337 if (td2->td_si.si_signo != 0 && 1338 #ifdef COMPAT_FREEBSD32 1339 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1340 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1341 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1342 pl_siginfo) + sizeof(struct siginfo32))) 1343 #else 1344 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1345 + sizeof(pl->pl_siginfo) 1346 #endif 1347 ){ 1348 pl->pl_flags |= PL_FLAG_SI; 1349 pl->pl_siginfo = td2->td_si; 1350 } 1351 } 1352 if (td2->td_dbgflags & TDB_SCE) 1353 pl->pl_flags |= PL_FLAG_SCE; 1354 else if (td2->td_dbgflags & TDB_SCX) 1355 pl->pl_flags |= PL_FLAG_SCX; 1356 if (td2->td_dbgflags & TDB_EXEC) 1357 pl->pl_flags |= PL_FLAG_EXEC; 1358 if (td2->td_dbgflags & TDB_FORK) { 1359 pl->pl_flags |= PL_FLAG_FORKED; 1360 pl->pl_child_pid = td2->td_dbg_forked; 1361 if (td2->td_dbgflags & TDB_VFORK) 1362 pl->pl_flags |= PL_FLAG_VFORKED; 1363 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1364 TDB_VFORK) 1365 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1366 if (td2->td_dbgflags & TDB_CHILD) 1367 pl->pl_flags |= PL_FLAG_CHILD; 1368 if (td2->td_dbgflags & TDB_BORN) 1369 pl->pl_flags |= PL_FLAG_BORN; 1370 if (td2->td_dbgflags & TDB_EXIT) 1371 pl->pl_flags |= PL_FLAG_EXITED; 1372 pl->pl_sigmask = td2->td_sigmask; 1373 pl->pl_siglist = td2->td_siglist; 1374 strcpy(pl->pl_tdname, td2->td_name); 1375 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1376 pl->pl_syscall_code = td2->td_sa.code; 1377 pl->pl_syscall_narg = td2->td_sa.narg; 1378 } else { 1379 pl->pl_syscall_code = 0; 1380 pl->pl_syscall_narg = 0; 1381 } 1382 #ifdef COMPAT_FREEBSD32 1383 if (wrap32) 1384 ptrace_lwpinfo_to32(pl, pl32); 1385 #endif 1386 CTR6(KTR_PTRACE, 1387 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1388 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1389 pl->pl_child_pid, pl->pl_syscall_code); 1390 break; 1391 1392 case PT_GETNUMLWPS: 1393 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1394 p->p_numthreads); 1395 td->td_retval[0] = p->p_numthreads; 1396 break; 1397 1398 case PT_GETLWPLIST: 1399 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1400 p->p_pid, data, p->p_numthreads); 1401 if (data <= 0) { 1402 error = EINVAL; 1403 break; 1404 } 1405 num = imin(p->p_numthreads, data); 1406 PROC_UNLOCK(p); 1407 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1408 tmp = 0; 1409 PROC_LOCK(p); 1410 FOREACH_THREAD_IN_PROC(p, td2) { 1411 if (tmp >= num) 1412 break; 1413 buf[tmp++] = td2->td_tid; 1414 } 1415 PROC_UNLOCK(p); 1416 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1417 free(buf, M_TEMP); 1418 if (!error) 1419 td->td_retval[0] = tmp; 1420 PROC_LOCK(p); 1421 break; 1422 1423 case PT_VM_TIMESTAMP: 1424 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1425 p->p_pid, p->p_vmspace->vm_map.timestamp); 1426 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1427 break; 1428 1429 case PT_VM_ENTRY: 1430 PROC_UNLOCK(p); 1431 #ifdef COMPAT_FREEBSD32 1432 if (wrap32) 1433 error = ptrace_vm_entry32(td, p, addr); 1434 else 1435 #endif 1436 error = ptrace_vm_entry(td, p, addr); 1437 PROC_LOCK(p); 1438 break; 1439 1440 default: 1441 #ifdef __HAVE_PTRACE_MACHDEP 1442 if (req >= PT_FIRSTMACH) { 1443 PROC_UNLOCK(p); 1444 error = cpu_ptrace(td2, req, addr, data); 1445 PROC_LOCK(p); 1446 } else 1447 #endif 1448 /* Unknown request. */ 1449 error = EINVAL; 1450 break; 1451 } 1452 1453 out: 1454 /* Drop our hold on this process now that the request has completed. */ 1455 _PRELE(p); 1456 fail: 1457 PROC_UNLOCK(p); 1458 if (proctree_locked) 1459 sx_xunlock(&proctree_lock); 1460 return (error); 1461 } 1462 #undef PROC_READ 1463 #undef PROC_WRITE 1464 1465 /* 1466 * Stop a process because of a debugging event; 1467 * stay stopped until p->p_step is cleared 1468 * (cleared by PIOCCONT in procfs). 1469 */ 1470 void 1471 stopevent(struct proc *p, unsigned int event, unsigned int val) 1472 { 1473 1474 PROC_LOCK_ASSERT(p, MA_OWNED); 1475 p->p_step = 1; 1476 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1477 val); 1478 do { 1479 if (event != S_EXIT) 1480 p->p_xsig = val; 1481 p->p_xthread = NULL; 1482 p->p_stype = event; /* Which event caused the stop? */ 1483 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1484 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1485 } while (p->p_step); 1486 }
Cache object: fbfd872c81801c46ecf3b3f6998ad670
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