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 * SPDX-License-Identifier: BSD-4-Clause 3 * 4 * Copyright (c) 1994, Sean Eric Fagan 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by Sean Eric Fagan. 18 * 4. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/limits.h> 40 #include <sys/lock.h> 41 #include <sys/mutex.h> 42 #include <sys/syscallsubr.h> 43 #include <sys/sysent.h> 44 #include <sys/sysproto.h> 45 #include <sys/pioctl.h> 46 #include <sys/priv.h> 47 #include <sys/proc.h> 48 #include <sys/vnode.h> 49 #include <sys/ptrace.h> 50 #include <sys/rwlock.h> 51 #include <sys/sx.h> 52 #include <sys/malloc.h> 53 #include <sys/signalvar.h> 54 55 #include <machine/reg.h> 56 57 #include <security/audit/audit.h> 58 59 #include <vm/vm.h> 60 #include <vm/pmap.h> 61 #include <vm/vm_extern.h> 62 #include <vm/vm_map.h> 63 #include <vm/vm_kern.h> 64 #include <vm/vm_object.h> 65 #include <vm/vm_page.h> 66 #include <vm/vm_param.h> 67 68 #ifdef COMPAT_FREEBSD32 69 #include <sys/procfs.h> 70 #include <compat/freebsd32/freebsd32_signal.h> 71 72 struct ptrace_io_desc32 { 73 int piod_op; 74 uint32_t piod_offs; 75 uint32_t piod_addr; 76 uint32_t piod_len; 77 }; 78 79 struct ptrace_sc_ret32 { 80 uint32_t sr_retval[2]; 81 int sr_error; 82 }; 83 84 struct ptrace_vm_entry32 { 85 int pve_entry; 86 int pve_timestamp; 87 uint32_t pve_start; 88 uint32_t pve_end; 89 uint32_t pve_offset; 90 u_int pve_prot; 91 u_int pve_pathlen; 92 int32_t pve_fileid; 93 u_int pve_fsid; 94 uint32_t pve_path; 95 }; 96 #endif 97 98 /* 99 * Functions implemented using PROC_ACTION(): 100 * 101 * proc_read_regs(proc, regs) 102 * Get the current user-visible register set from the process 103 * and copy it into the regs structure (<machine/reg.h>). 104 * The process is stopped at the time read_regs is called. 105 * 106 * proc_write_regs(proc, regs) 107 * Update the current register set from the passed in regs 108 * structure. Take care to avoid clobbering special CPU 109 * registers or privileged bits in the PSL. 110 * Depending on the architecture this may have fix-up work to do, 111 * especially if the IAR or PCW are modified. 112 * The process is stopped at the time write_regs is called. 113 * 114 * proc_read_fpregs, proc_write_fpregs 115 * deal with the floating point register set, otherwise as above. 116 * 117 * proc_read_dbregs, proc_write_dbregs 118 * deal with the processor debug register set, otherwise as above. 119 * 120 * proc_sstep(proc) 121 * Arrange for the process to trap after executing a single instruction. 122 */ 123 124 #define PROC_ACTION(action) do { \ 125 int error; \ 126 \ 127 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \ 128 if ((td->td_proc->p_flag & P_INMEM) == 0) \ 129 error = EIO; \ 130 else \ 131 error = (action); \ 132 return (error); \ 133 } while(0) 134 135 int 136 proc_read_regs(struct thread *td, struct reg *regs) 137 { 138 139 PROC_ACTION(fill_regs(td, regs)); 140 } 141 142 int 143 proc_write_regs(struct thread *td, struct reg *regs) 144 { 145 146 PROC_ACTION(set_regs(td, regs)); 147 } 148 149 int 150 proc_read_dbregs(struct thread *td, struct dbreg *dbregs) 151 { 152 153 PROC_ACTION(fill_dbregs(td, dbregs)); 154 } 155 156 int 157 proc_write_dbregs(struct thread *td, struct dbreg *dbregs) 158 { 159 160 PROC_ACTION(set_dbregs(td, dbregs)); 161 } 162 163 /* 164 * Ptrace doesn't support fpregs at all, and there are no security holes 165 * or translations for fpregs, so we can just copy them. 166 */ 167 int 168 proc_read_fpregs(struct thread *td, struct fpreg *fpregs) 169 { 170 171 PROC_ACTION(fill_fpregs(td, fpregs)); 172 } 173 174 int 175 proc_write_fpregs(struct thread *td, struct fpreg *fpregs) 176 { 177 178 PROC_ACTION(set_fpregs(td, fpregs)); 179 } 180 181 #ifdef COMPAT_FREEBSD32 182 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */ 183 int 184 proc_read_regs32(struct thread *td, struct reg32 *regs32) 185 { 186 187 PROC_ACTION(fill_regs32(td, regs32)); 188 } 189 190 int 191 proc_write_regs32(struct thread *td, struct reg32 *regs32) 192 { 193 194 PROC_ACTION(set_regs32(td, regs32)); 195 } 196 197 int 198 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 199 { 200 201 PROC_ACTION(fill_dbregs32(td, dbregs32)); 202 } 203 204 int 205 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32) 206 { 207 208 PROC_ACTION(set_dbregs32(td, dbregs32)); 209 } 210 211 int 212 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 213 { 214 215 PROC_ACTION(fill_fpregs32(td, fpregs32)); 216 } 217 218 int 219 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32) 220 { 221 222 PROC_ACTION(set_fpregs32(td, fpregs32)); 223 } 224 #endif 225 226 int 227 proc_sstep(struct thread *td) 228 { 229 230 PROC_ACTION(ptrace_single_step(td)); 231 } 232 233 int 234 proc_rwmem(struct proc *p, struct uio *uio) 235 { 236 vm_map_t map; 237 vm_offset_t pageno; /* page number */ 238 vm_prot_t reqprot; 239 int error, fault_flags, page_offset, writing; 240 241 /* 242 * Assert that someone has locked this vmspace. (Should be 243 * curthread but we can't assert that.) This keeps the process 244 * from exiting out from under us until this operation completes. 245 */ 246 PROC_ASSERT_HELD(p); 247 PROC_LOCK_ASSERT(p, MA_NOTOWNED); 248 249 /* 250 * The map we want... 251 */ 252 map = &p->p_vmspace->vm_map; 253 254 /* 255 * If we are writing, then we request vm_fault() to create a private 256 * copy of each page. Since these copies will not be writeable by the 257 * process, we must explicity request that they be dirtied. 258 */ 259 writing = uio->uio_rw == UIO_WRITE; 260 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ; 261 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL; 262 263 /* 264 * Only map in one page at a time. We don't have to, but it 265 * makes things easier. This way is trivial - right? 266 */ 267 do { 268 vm_offset_t uva; 269 u_int len; 270 vm_page_t m; 271 272 uva = (vm_offset_t)uio->uio_offset; 273 274 /* 275 * Get the page number of this segment. 276 */ 277 pageno = trunc_page(uva); 278 page_offset = uva - pageno; 279 280 /* 281 * How many bytes to copy 282 */ 283 len = min(PAGE_SIZE - page_offset, uio->uio_resid); 284 285 /* 286 * Fault and hold the page on behalf of the process. 287 */ 288 error = vm_fault(map, pageno, reqprot, fault_flags, &m); 289 if (error != KERN_SUCCESS) { 290 if (error == KERN_RESOURCE_SHORTAGE) 291 error = ENOMEM; 292 else 293 error = EFAULT; 294 break; 295 } 296 297 /* 298 * Now do the i/o move. 299 */ 300 error = uiomove_fromphys(&m, page_offset, len, uio); 301 302 /* Make the I-cache coherent for breakpoints. */ 303 if (writing && error == 0) { 304 vm_map_lock_read(map); 305 if (vm_map_check_protection(map, pageno, pageno + 306 PAGE_SIZE, VM_PROT_EXECUTE)) 307 vm_sync_icache(map, uva, len); 308 vm_map_unlock_read(map); 309 } 310 311 /* 312 * Release the page. 313 */ 314 vm_page_lock(m); 315 vm_page_unhold(m); 316 vm_page_unlock(m); 317 318 } while (error == 0 && uio->uio_resid > 0); 319 320 return (error); 321 } 322 323 static ssize_t 324 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 325 size_t len, enum uio_rw rw) 326 { 327 struct iovec iov; 328 struct uio uio; 329 ssize_t slen; 330 331 MPASS(len < SSIZE_MAX); 332 slen = (ssize_t)len; 333 334 iov.iov_base = (caddr_t)buf; 335 iov.iov_len = len; 336 uio.uio_iov = &iov; 337 uio.uio_iovcnt = 1; 338 uio.uio_offset = va; 339 uio.uio_resid = slen; 340 uio.uio_segflg = UIO_SYSSPACE; 341 uio.uio_rw = rw; 342 uio.uio_td = td; 343 proc_rwmem(p, &uio); 344 if (uio.uio_resid == slen) 345 return (-1); 346 return (slen - uio.uio_resid); 347 } 348 349 ssize_t 350 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 351 size_t len) 352 { 353 354 return (proc_iop(td, p, va, buf, len, UIO_READ)); 355 } 356 357 ssize_t 358 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf, 359 size_t len) 360 { 361 362 return (proc_iop(td, p, va, buf, len, UIO_WRITE)); 363 } 364 365 static int 366 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve) 367 { 368 struct vattr vattr; 369 vm_map_t map; 370 vm_map_entry_t entry; 371 vm_object_t obj, tobj, lobj; 372 struct vmspace *vm; 373 struct vnode *vp; 374 char *freepath, *fullpath; 375 u_int pathlen; 376 int error, index; 377 378 error = 0; 379 obj = NULL; 380 381 vm = vmspace_acquire_ref(p); 382 map = &vm->vm_map; 383 vm_map_lock_read(map); 384 385 do { 386 entry = map->header.next; 387 index = 0; 388 while (index < pve->pve_entry && entry != &map->header) { 389 entry = entry->next; 390 index++; 391 } 392 if (index != pve->pve_entry) { 393 error = EINVAL; 394 break; 395 } 396 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0, 397 ("Submap in map header")); 398 while ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) { 399 entry = entry->next; 400 index++; 401 } 402 if (entry == &map->header) { 403 error = ENOENT; 404 break; 405 } 406 407 /* We got an entry. */ 408 pve->pve_entry = index + 1; 409 pve->pve_timestamp = map->timestamp; 410 pve->pve_start = entry->start; 411 pve->pve_end = entry->end - 1; 412 pve->pve_offset = entry->offset; 413 pve->pve_prot = entry->protection; 414 415 /* Backing object's path needed? */ 416 if (pve->pve_pathlen == 0) 417 break; 418 419 pathlen = pve->pve_pathlen; 420 pve->pve_pathlen = 0; 421 422 obj = entry->object.vm_object; 423 if (obj != NULL) 424 VM_OBJECT_RLOCK(obj); 425 } while (0); 426 427 vm_map_unlock_read(map); 428 429 pve->pve_fsid = VNOVAL; 430 pve->pve_fileid = VNOVAL; 431 432 if (error == 0 && obj != NULL) { 433 lobj = obj; 434 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) { 435 if (tobj != obj) 436 VM_OBJECT_RLOCK(tobj); 437 if (lobj != obj) 438 VM_OBJECT_RUNLOCK(lobj); 439 lobj = tobj; 440 pve->pve_offset += tobj->backing_object_offset; 441 } 442 vp = vm_object_vnode(lobj); 443 if (vp != NULL) 444 vref(vp); 445 if (lobj != obj) 446 VM_OBJECT_RUNLOCK(lobj); 447 VM_OBJECT_RUNLOCK(obj); 448 449 if (vp != NULL) { 450 freepath = NULL; 451 fullpath = NULL; 452 vn_fullpath(td, vp, &fullpath, &freepath); 453 vn_lock(vp, LK_SHARED | LK_RETRY); 454 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) { 455 pve->pve_fileid = vattr.va_fileid; 456 pve->pve_fsid = vattr.va_fsid; 457 } 458 vput(vp); 459 460 if (fullpath != NULL) { 461 pve->pve_pathlen = strlen(fullpath) + 1; 462 if (pve->pve_pathlen <= pathlen) { 463 error = copyout(fullpath, pve->pve_path, 464 pve->pve_pathlen); 465 } else 466 error = ENAMETOOLONG; 467 } 468 if (freepath != NULL) 469 free(freepath, M_TEMP); 470 } 471 } 472 vmspace_free(vm); 473 if (error == 0) 474 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p", 475 p->p_pid, pve->pve_entry, pve->pve_start); 476 477 return (error); 478 } 479 480 #ifdef COMPAT_FREEBSD32 481 static int 482 ptrace_vm_entry32(struct thread *td, struct proc *p, 483 struct ptrace_vm_entry32 *pve32) 484 { 485 struct ptrace_vm_entry pve; 486 int error; 487 488 pve.pve_entry = pve32->pve_entry; 489 pve.pve_pathlen = pve32->pve_pathlen; 490 pve.pve_path = (void *)(uintptr_t)pve32->pve_path; 491 492 error = ptrace_vm_entry(td, p, &pve); 493 if (error == 0) { 494 pve32->pve_entry = pve.pve_entry; 495 pve32->pve_timestamp = pve.pve_timestamp; 496 pve32->pve_start = pve.pve_start; 497 pve32->pve_end = pve.pve_end; 498 pve32->pve_offset = pve.pve_offset; 499 pve32->pve_prot = pve.pve_prot; 500 pve32->pve_fileid = pve.pve_fileid; 501 pve32->pve_fsid = pve.pve_fsid; 502 } 503 504 pve32->pve_pathlen = pve.pve_pathlen; 505 return (error); 506 } 507 508 static void 509 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl, 510 struct ptrace_lwpinfo32 *pl32) 511 { 512 513 bzero(pl32, sizeof(*pl32)); 514 pl32->pl_lwpid = pl->pl_lwpid; 515 pl32->pl_event = pl->pl_event; 516 pl32->pl_flags = pl->pl_flags; 517 pl32->pl_sigmask = pl->pl_sigmask; 518 pl32->pl_siglist = pl->pl_siglist; 519 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo); 520 strcpy(pl32->pl_tdname, pl->pl_tdname); 521 pl32->pl_child_pid = pl->pl_child_pid; 522 pl32->pl_syscall_code = pl->pl_syscall_code; 523 pl32->pl_syscall_narg = pl->pl_syscall_narg; 524 } 525 526 static void 527 ptrace_sc_ret_to32(const struct ptrace_sc_ret *psr, 528 struct ptrace_sc_ret32 *psr32) 529 { 530 531 bzero(psr32, sizeof(*psr32)); 532 psr32->sr_retval[0] = psr->sr_retval[0]; 533 psr32->sr_retval[1] = psr->sr_retval[1]; 534 psr32->sr_error = psr->sr_error; 535 } 536 #endif /* COMPAT_FREEBSD32 */ 537 538 /* 539 * Process debugging system call. 540 */ 541 #ifndef _SYS_SYSPROTO_H_ 542 struct ptrace_args { 543 int req; 544 pid_t pid; 545 caddr_t addr; 546 int data; 547 }; 548 #endif 549 550 #ifdef COMPAT_FREEBSD32 551 /* 552 * This CPP subterfuge is to try and reduce the number of ifdefs in 553 * the body of the code. 554 * COPYIN(uap->addr, &r.reg, sizeof r.reg); 555 * becomes either: 556 * copyin(uap->addr, &r.reg, sizeof r.reg); 557 * or 558 * copyin(uap->addr, &r.reg32, sizeof r.reg32); 559 * .. except this is done at runtime. 560 */ 561 #define BZERO(a, s) wrap32 ? \ 562 bzero(a ## 32, s ## 32) : \ 563 bzero(a, s) 564 #define COPYIN(u, k, s) wrap32 ? \ 565 copyin(u, k ## 32, s ## 32) : \ 566 copyin(u, k, s) 567 #define COPYOUT(k, u, s) wrap32 ? \ 568 copyout(k ## 32, u, s ## 32) : \ 569 copyout(k, u, s) 570 #else 571 #define BZERO(a, s) bzero(a, s) 572 #define COPYIN(u, k, s) copyin(u, k, s) 573 #define COPYOUT(k, u, s) copyout(k, u, s) 574 #endif 575 int 576 sys_ptrace(struct thread *td, struct ptrace_args *uap) 577 { 578 /* 579 * XXX this obfuscation is to reduce stack usage, but the register 580 * structs may be too large to put on the stack anyway. 581 */ 582 union { 583 struct ptrace_io_desc piod; 584 struct ptrace_lwpinfo pl; 585 struct ptrace_vm_entry pve; 586 struct dbreg dbreg; 587 struct fpreg fpreg; 588 struct reg reg; 589 #ifdef COMPAT_FREEBSD32 590 struct dbreg32 dbreg32; 591 struct fpreg32 fpreg32; 592 struct reg32 reg32; 593 struct ptrace_io_desc32 piod32; 594 struct ptrace_lwpinfo32 pl32; 595 struct ptrace_vm_entry32 pve32; 596 #endif 597 char args[sizeof(td->td_sa.args)]; 598 struct ptrace_sc_ret psr; 599 int ptevents; 600 } r; 601 void *addr; 602 int error = 0; 603 #ifdef COMPAT_FREEBSD32 604 int wrap32 = 0; 605 606 if (SV_CURPROC_FLAG(SV_ILP32)) 607 wrap32 = 1; 608 #endif 609 AUDIT_ARG_PID(uap->pid); 610 AUDIT_ARG_CMD(uap->req); 611 AUDIT_ARG_VALUE(uap->data); 612 addr = &r; 613 switch (uap->req) { 614 case PT_GET_EVENT_MASK: 615 case PT_LWPINFO: 616 case PT_GET_SC_ARGS: 617 case PT_GET_SC_RET: 618 break; 619 case PT_GETREGS: 620 BZERO(&r.reg, sizeof r.reg); 621 break; 622 case PT_GETFPREGS: 623 BZERO(&r.fpreg, sizeof r.fpreg); 624 break; 625 case PT_GETDBREGS: 626 BZERO(&r.dbreg, sizeof r.dbreg); 627 break; 628 case PT_SETREGS: 629 error = COPYIN(uap->addr, &r.reg, sizeof r.reg); 630 break; 631 case PT_SETFPREGS: 632 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg); 633 break; 634 case PT_SETDBREGS: 635 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg); 636 break; 637 case PT_SET_EVENT_MASK: 638 if (uap->data != sizeof(r.ptevents)) 639 error = EINVAL; 640 else 641 error = copyin(uap->addr, &r.ptevents, uap->data); 642 break; 643 case PT_IO: 644 error = COPYIN(uap->addr, &r.piod, sizeof r.piod); 645 break; 646 case PT_VM_ENTRY: 647 error = COPYIN(uap->addr, &r.pve, sizeof r.pve); 648 break; 649 default: 650 addr = uap->addr; 651 break; 652 } 653 if (error) 654 return (error); 655 656 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data); 657 if (error) 658 return (error); 659 660 switch (uap->req) { 661 case PT_VM_ENTRY: 662 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve); 663 break; 664 case PT_IO: 665 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod); 666 break; 667 case PT_GETREGS: 668 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg); 669 break; 670 case PT_GETFPREGS: 671 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg); 672 break; 673 case PT_GETDBREGS: 674 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg); 675 break; 676 case PT_GET_EVENT_MASK: 677 /* NB: The size in uap->data is validated in kern_ptrace(). */ 678 error = copyout(&r.ptevents, uap->addr, uap->data); 679 break; 680 case PT_LWPINFO: 681 /* NB: The size in uap->data is validated in kern_ptrace(). */ 682 error = copyout(&r.pl, uap->addr, uap->data); 683 break; 684 case PT_GET_SC_ARGS: 685 error = copyout(r.args, uap->addr, MIN(uap->data, 686 sizeof(r.args))); 687 break; 688 case PT_GET_SC_RET: 689 error = copyout(&r.psr, uap->addr, MIN(uap->data, 690 sizeof(r.psr))); 691 break; 692 } 693 694 return (error); 695 } 696 #undef COPYIN 697 #undef COPYOUT 698 #undef BZERO 699 700 #ifdef COMPAT_FREEBSD32 701 /* 702 * PROC_READ(regs, td2, addr); 703 * becomes either: 704 * proc_read_regs(td2, addr); 705 * or 706 * proc_read_regs32(td2, addr); 707 * .. except this is done at runtime. There is an additional 708 * complication in that PROC_WRITE disallows 32 bit consumers 709 * from writing to 64 bit address space targets. 710 */ 711 #define PROC_READ(w, t, a) wrap32 ? \ 712 proc_read_ ## w ## 32(t, a) : \ 713 proc_read_ ## w (t, a) 714 #define PROC_WRITE(w, t, a) wrap32 ? \ 715 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \ 716 proc_write_ ## w (t, a) 717 #else 718 #define PROC_READ(w, t, a) proc_read_ ## w (t, a) 719 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a) 720 #endif 721 722 void 723 proc_set_traced(struct proc *p, bool stop) 724 { 725 726 sx_assert(&proctree_lock, SX_XLOCKED); 727 PROC_LOCK_ASSERT(p, MA_OWNED); 728 p->p_flag |= P_TRACED; 729 if (stop) 730 p->p_flag2 |= P2_PTRACE_FSTP; 731 p->p_ptevents = PTRACE_DEFAULT; 732 } 733 734 int 735 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data) 736 { 737 struct iovec iov; 738 struct uio uio; 739 struct proc *curp, *p, *pp; 740 struct thread *td2 = NULL, *td3; 741 struct ptrace_io_desc *piod = NULL; 742 struct ptrace_lwpinfo *pl; 743 struct ptrace_sc_ret *psr; 744 int error, num, tmp; 745 int proctree_locked = 0; 746 lwpid_t tid = 0, *buf; 747 #ifdef COMPAT_FREEBSD32 748 int wrap32 = 0, safe = 0; 749 struct ptrace_io_desc32 *piod32 = NULL; 750 struct ptrace_lwpinfo32 *pl32 = NULL; 751 struct ptrace_sc_ret32 *psr32 = NULL; 752 union { 753 struct ptrace_lwpinfo pl; 754 struct ptrace_sc_ret psr; 755 } r; 756 #endif 757 758 curp = td->td_proc; 759 760 /* Lock proctree before locking the process. */ 761 switch (req) { 762 case PT_TRACE_ME: 763 case PT_ATTACH: 764 case PT_STEP: 765 case PT_CONTINUE: 766 case PT_TO_SCE: 767 case PT_TO_SCX: 768 case PT_SYSCALL: 769 case PT_FOLLOW_FORK: 770 case PT_LWP_EVENTS: 771 case PT_GET_EVENT_MASK: 772 case PT_SET_EVENT_MASK: 773 case PT_DETACH: 774 case PT_GET_SC_ARGS: 775 sx_xlock(&proctree_lock); 776 proctree_locked = 1; 777 break; 778 default: 779 break; 780 } 781 782 if (req == PT_TRACE_ME) { 783 p = td->td_proc; 784 PROC_LOCK(p); 785 } else { 786 if (pid <= PID_MAX) { 787 if ((p = pfind(pid)) == NULL) { 788 if (proctree_locked) 789 sx_xunlock(&proctree_lock); 790 return (ESRCH); 791 } 792 } else { 793 td2 = tdfind(pid, -1); 794 if (td2 == NULL) { 795 if (proctree_locked) 796 sx_xunlock(&proctree_lock); 797 return (ESRCH); 798 } 799 p = td2->td_proc; 800 tid = pid; 801 pid = p->p_pid; 802 } 803 } 804 AUDIT_ARG_PROCESS(p); 805 806 if ((p->p_flag & P_WEXIT) != 0) { 807 error = ESRCH; 808 goto fail; 809 } 810 if ((error = p_cansee(td, p)) != 0) 811 goto fail; 812 813 if ((error = p_candebug(td, p)) != 0) 814 goto fail; 815 816 /* 817 * System processes can't be debugged. 818 */ 819 if ((p->p_flag & P_SYSTEM) != 0) { 820 error = EINVAL; 821 goto fail; 822 } 823 824 if (tid == 0) { 825 if ((p->p_flag & P_STOPPED_TRACE) != 0) { 826 KASSERT(p->p_xthread != NULL, ("NULL p_xthread")); 827 td2 = p->p_xthread; 828 } else { 829 td2 = FIRST_THREAD_IN_PROC(p); 830 } 831 tid = td2->td_tid; 832 } 833 834 #ifdef COMPAT_FREEBSD32 835 /* 836 * Test if we're a 32 bit client and what the target is. 837 * Set the wrap controls accordingly. 838 */ 839 if (SV_CURPROC_FLAG(SV_ILP32)) { 840 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32)) 841 safe = 1; 842 wrap32 = 1; 843 } 844 #endif 845 /* 846 * Permissions check 847 */ 848 switch (req) { 849 case PT_TRACE_ME: 850 /* 851 * Always legal, when there is a parent process which 852 * could trace us. Otherwise, reject. 853 */ 854 if ((p->p_flag & P_TRACED) != 0) { 855 error = EBUSY; 856 goto fail; 857 } 858 if (p->p_pptr == initproc) { 859 error = EPERM; 860 goto fail; 861 } 862 break; 863 864 case PT_ATTACH: 865 /* Self */ 866 if (p == td->td_proc) { 867 error = EINVAL; 868 goto fail; 869 } 870 871 /* Already traced */ 872 if (p->p_flag & P_TRACED) { 873 error = EBUSY; 874 goto fail; 875 } 876 877 /* Can't trace an ancestor if you're being traced. */ 878 if (curp->p_flag & P_TRACED) { 879 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) { 880 if (pp == p) { 881 error = EINVAL; 882 goto fail; 883 } 884 } 885 } 886 887 888 /* OK */ 889 break; 890 891 case PT_CLEARSTEP: 892 /* Allow thread to clear single step for itself */ 893 if (td->td_tid == tid) 894 break; 895 896 /* FALLTHROUGH */ 897 default: 898 /* not being traced... */ 899 if ((p->p_flag & P_TRACED) == 0) { 900 error = EPERM; 901 goto fail; 902 } 903 904 /* not being traced by YOU */ 905 if (p->p_pptr != td->td_proc) { 906 error = EBUSY; 907 goto fail; 908 } 909 910 /* not currently stopped */ 911 if ((p->p_flag & P_STOPPED_TRACE) == 0 || 912 p->p_suspcount != p->p_numthreads || 913 (p->p_flag & P_WAITED) == 0) { 914 error = EBUSY; 915 goto fail; 916 } 917 918 /* OK */ 919 break; 920 } 921 922 /* Keep this process around until we finish this request. */ 923 _PHOLD(p); 924 925 /* 926 * Actually do the requests 927 */ 928 929 td->td_retval[0] = 0; 930 931 switch (req) { 932 case PT_TRACE_ME: 933 /* set my trace flag and "owner" so it can read/write me */ 934 proc_set_traced(p, false); 935 if (p->p_flag & P_PPWAIT) 936 p->p_flag |= P_PPTRACE; 937 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid); 938 break; 939 940 case PT_ATTACH: 941 /* security check done above */ 942 /* 943 * It would be nice if the tracing relationship was separate 944 * from the parent relationship but that would require 945 * another set of links in the proc struct or for "wait" 946 * to scan the entire proc table. To make life easier, 947 * we just re-parent the process we're trying to trace. 948 * The old parent is remembered so we can put things back 949 * on a "detach". 950 */ 951 proc_set_traced(p, true); 952 proc_reparent(p, td->td_proc, false); 953 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid, 954 p->p_oppid); 955 956 sx_xunlock(&proctree_lock); 957 proctree_locked = 0; 958 MPASS(p->p_xthread == NULL); 959 MPASS((p->p_flag & P_STOPPED_TRACE) == 0); 960 961 /* 962 * If already stopped due to a stop signal, clear the 963 * existing stop before triggering a traced SIGSTOP. 964 */ 965 if ((p->p_flag & P_STOPPED_SIG) != 0) { 966 PROC_SLOCK(p); 967 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED); 968 thread_unsuspend(p); 969 PROC_SUNLOCK(p); 970 } 971 972 kern_psignal(p, SIGSTOP); 973 break; 974 975 case PT_CLEARSTEP: 976 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid, 977 p->p_pid); 978 error = ptrace_clear_single_step(td2); 979 break; 980 981 case PT_SETSTEP: 982 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid, 983 p->p_pid); 984 error = ptrace_single_step(td2); 985 break; 986 987 case PT_SUSPEND: 988 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid, 989 p->p_pid); 990 td2->td_dbgflags |= TDB_SUSPEND; 991 thread_lock(td2); 992 td2->td_flags |= TDF_NEEDSUSPCHK; 993 thread_unlock(td2); 994 break; 995 996 case PT_RESUME: 997 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid, 998 p->p_pid); 999 td2->td_dbgflags &= ~TDB_SUSPEND; 1000 break; 1001 1002 case PT_FOLLOW_FORK: 1003 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid, 1004 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled", 1005 data ? "enabled" : "disabled"); 1006 if (data) 1007 p->p_ptevents |= PTRACE_FORK; 1008 else 1009 p->p_ptevents &= ~PTRACE_FORK; 1010 break; 1011 1012 case PT_LWP_EVENTS: 1013 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid, 1014 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled", 1015 data ? "enabled" : "disabled"); 1016 if (data) 1017 p->p_ptevents |= PTRACE_LWP; 1018 else 1019 p->p_ptevents &= ~PTRACE_LWP; 1020 break; 1021 1022 case PT_GET_EVENT_MASK: 1023 if (data != sizeof(p->p_ptevents)) { 1024 error = EINVAL; 1025 break; 1026 } 1027 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid, 1028 p->p_ptevents); 1029 *(int *)addr = p->p_ptevents; 1030 break; 1031 1032 case PT_SET_EVENT_MASK: 1033 if (data != sizeof(p->p_ptevents)) { 1034 error = EINVAL; 1035 break; 1036 } 1037 tmp = *(int *)addr; 1038 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX | 1039 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) { 1040 error = EINVAL; 1041 break; 1042 } 1043 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x", 1044 p->p_pid, p->p_ptevents, tmp); 1045 p->p_ptevents = tmp; 1046 break; 1047 1048 case PT_GET_SC_ARGS: 1049 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid); 1050 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0 1051 #ifdef COMPAT_FREEBSD32 1052 || (wrap32 && !safe) 1053 #endif 1054 ) { 1055 error = EINVAL; 1056 break; 1057 } 1058 bzero(addr, sizeof(td2->td_sa.args)); 1059 #ifdef COMPAT_FREEBSD32 1060 if (wrap32) 1061 for (num = 0; num < nitems(td2->td_sa.args); num++) 1062 ((uint32_t *)addr)[num] = (uint32_t) 1063 td2->td_sa.args[num]; 1064 else 1065 #endif 1066 bcopy(td2->td_sa.args, addr, td2->td_sa.narg * 1067 sizeof(register_t)); 1068 break; 1069 1070 case PT_GET_SC_RET: 1071 if ((td2->td_dbgflags & (TDB_SCX)) == 0 1072 #ifdef COMPAT_FREEBSD32 1073 || (wrap32 && !safe) 1074 #endif 1075 ) { 1076 error = EINVAL; 1077 break; 1078 } 1079 #ifdef COMPAT_FREEBSD32 1080 if (wrap32) { 1081 psr = &r.psr; 1082 psr32 = addr; 1083 } else 1084 #endif 1085 psr = addr; 1086 bzero(psr, sizeof(*psr)); 1087 psr->sr_error = td2->td_errno; 1088 if (psr->sr_error == 0) { 1089 psr->sr_retval[0] = td2->td_retval[0]; 1090 psr->sr_retval[1] = td2->td_retval[1]; 1091 } 1092 #ifdef COMPAT_FREEBSD32 1093 if (wrap32) 1094 ptrace_sc_ret_to32(psr, psr32); 1095 #endif 1096 CTR4(KTR_PTRACE, 1097 "PT_GET_SC_RET: pid %d error %d retval %#lx,%#lx", 1098 p->p_pid, psr->sr_error, psr->sr_retval[0], 1099 psr->sr_retval[1]); 1100 break; 1101 1102 case PT_STEP: 1103 case PT_CONTINUE: 1104 case PT_TO_SCE: 1105 case PT_TO_SCX: 1106 case PT_SYSCALL: 1107 case PT_DETACH: 1108 /* Zero means do not send any signal */ 1109 if (data < 0 || data > _SIG_MAXSIG) { 1110 error = EINVAL; 1111 break; 1112 } 1113 1114 switch (req) { 1115 case PT_STEP: 1116 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d", 1117 td2->td_tid, p->p_pid, data); 1118 error = ptrace_single_step(td2); 1119 if (error) 1120 goto out; 1121 break; 1122 case PT_CONTINUE: 1123 case PT_TO_SCE: 1124 case PT_TO_SCX: 1125 case PT_SYSCALL: 1126 if (addr != (void *)1) { 1127 error = ptrace_set_pc(td2, 1128 (u_long)(uintfptr_t)addr); 1129 if (error) 1130 goto out; 1131 } 1132 switch (req) { 1133 case PT_TO_SCE: 1134 p->p_ptevents |= PTRACE_SCE; 1135 CTR4(KTR_PTRACE, 1136 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d", 1137 p->p_pid, p->p_ptevents, 1138 (u_long)(uintfptr_t)addr, data); 1139 break; 1140 case PT_TO_SCX: 1141 p->p_ptevents |= PTRACE_SCX; 1142 CTR4(KTR_PTRACE, 1143 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d", 1144 p->p_pid, p->p_ptevents, 1145 (u_long)(uintfptr_t)addr, data); 1146 break; 1147 case PT_SYSCALL: 1148 p->p_ptevents |= PTRACE_SYSCALL; 1149 CTR4(KTR_PTRACE, 1150 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d", 1151 p->p_pid, p->p_ptevents, 1152 (u_long)(uintfptr_t)addr, data); 1153 break; 1154 case PT_CONTINUE: 1155 CTR3(KTR_PTRACE, 1156 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d", 1157 p->p_pid, (u_long)(uintfptr_t)addr, data); 1158 break; 1159 } 1160 break; 1161 case PT_DETACH: 1162 /* 1163 * Clear P_TRACED before reparenting 1164 * a detached process back to its original 1165 * parent. Otherwise the debugee will be set 1166 * as an orphan of the debugger. 1167 */ 1168 p->p_flag &= ~(P_TRACED | P_WAITED); 1169 1170 /* 1171 * Reset the process parent. 1172 */ 1173 if (p->p_oppid != p->p_pptr->p_pid) { 1174 PROC_LOCK(p->p_pptr); 1175 sigqueue_take(p->p_ksi); 1176 PROC_UNLOCK(p->p_pptr); 1177 1178 pp = proc_realparent(p); 1179 proc_reparent(p, pp, false); 1180 if (pp == initproc) 1181 p->p_sigparent = SIGCHLD; 1182 CTR3(KTR_PTRACE, 1183 "PT_DETACH: pid %d reparented to pid %d, sig %d", 1184 p->p_pid, pp->p_pid, data); 1185 } else { 1186 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d", 1187 p->p_pid, data); 1188 } 1189 1190 p->p_ptevents = 0; 1191 FOREACH_THREAD_IN_PROC(p, td3) { 1192 if ((td3->td_dbgflags & TDB_FSTP) != 0) { 1193 sigqueue_delete(&td3->td_sigqueue, 1194 SIGSTOP); 1195 } 1196 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP | 1197 TDB_SUSPEND); 1198 } 1199 1200 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) { 1201 sigqueue_delete(&p->p_sigqueue, SIGSTOP); 1202 p->p_flag2 &= ~P2_PTRACE_FSTP; 1203 } 1204 1205 /* should we send SIGCHLD? */ 1206 /* childproc_continued(p); */ 1207 break; 1208 } 1209 1210 sx_xunlock(&proctree_lock); 1211 proctree_locked = 0; 1212 1213 sendsig: 1214 MPASS(proctree_locked == 0); 1215 1216 /* 1217 * Clear the pending event for the thread that just 1218 * reported its event (p_xthread). This may not be 1219 * the thread passed to PT_CONTINUE, PT_STEP, etc. if 1220 * the debugger is resuming a different thread. 1221 * 1222 * Deliver any pending signal via the reporting thread. 1223 */ 1224 MPASS(p->p_xthread != NULL); 1225 p->p_xthread->td_dbgflags &= ~TDB_XSIG; 1226 p->p_xthread->td_xsig = data; 1227 p->p_xthread = NULL; 1228 p->p_xsig = data; 1229 1230 /* 1231 * P_WKILLED is insurance that a PT_KILL/SIGKILL 1232 * always works immediately, even if another thread is 1233 * unsuspended first and attempts to handle a 1234 * different signal or if the POSIX.1b style signal 1235 * queue cannot accommodate any new signals. 1236 */ 1237 if (data == SIGKILL) 1238 proc_wkilled(p); 1239 1240 /* 1241 * Unsuspend all threads. To leave a thread 1242 * suspended, use PT_SUSPEND to suspend it before 1243 * continuing the process. 1244 */ 1245 PROC_SLOCK(p); 1246 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED); 1247 thread_unsuspend(p); 1248 PROC_SUNLOCK(p); 1249 break; 1250 1251 case PT_WRITE_I: 1252 case PT_WRITE_D: 1253 td2->td_dbgflags |= TDB_USERWR; 1254 PROC_UNLOCK(p); 1255 error = 0; 1256 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data, 1257 sizeof(int)) != sizeof(int)) 1258 error = ENOMEM; 1259 else 1260 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x", 1261 p->p_pid, addr, data); 1262 PROC_LOCK(p); 1263 break; 1264 1265 case PT_READ_I: 1266 case PT_READ_D: 1267 PROC_UNLOCK(p); 1268 error = tmp = 0; 1269 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp, 1270 sizeof(int)) != sizeof(int)) 1271 error = ENOMEM; 1272 else 1273 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x", 1274 p->p_pid, addr, tmp); 1275 td->td_retval[0] = tmp; 1276 PROC_LOCK(p); 1277 break; 1278 1279 case PT_IO: 1280 #ifdef COMPAT_FREEBSD32 1281 if (wrap32) { 1282 piod32 = addr; 1283 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr; 1284 iov.iov_len = piod32->piod_len; 1285 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs; 1286 uio.uio_resid = piod32->piod_len; 1287 } else 1288 #endif 1289 { 1290 piod = addr; 1291 iov.iov_base = piod->piod_addr; 1292 iov.iov_len = piod->piod_len; 1293 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs; 1294 uio.uio_resid = piod->piod_len; 1295 } 1296 uio.uio_iov = &iov; 1297 uio.uio_iovcnt = 1; 1298 uio.uio_segflg = UIO_USERSPACE; 1299 uio.uio_td = td; 1300 #ifdef COMPAT_FREEBSD32 1301 tmp = wrap32 ? piod32->piod_op : piod->piod_op; 1302 #else 1303 tmp = piod->piod_op; 1304 #endif 1305 switch (tmp) { 1306 case PIOD_READ_D: 1307 case PIOD_READ_I: 1308 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)", 1309 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1310 uio.uio_rw = UIO_READ; 1311 break; 1312 case PIOD_WRITE_D: 1313 case PIOD_WRITE_I: 1314 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)", 1315 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid); 1316 td2->td_dbgflags |= TDB_USERWR; 1317 uio.uio_rw = UIO_WRITE; 1318 break; 1319 default: 1320 error = EINVAL; 1321 goto out; 1322 } 1323 PROC_UNLOCK(p); 1324 error = proc_rwmem(p, &uio); 1325 #ifdef COMPAT_FREEBSD32 1326 if (wrap32) 1327 piod32->piod_len -= uio.uio_resid; 1328 else 1329 #endif 1330 piod->piod_len -= uio.uio_resid; 1331 PROC_LOCK(p); 1332 break; 1333 1334 case PT_KILL: 1335 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid); 1336 data = SIGKILL; 1337 goto sendsig; /* in PT_CONTINUE above */ 1338 1339 case PT_SETREGS: 1340 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid, 1341 p->p_pid); 1342 td2->td_dbgflags |= TDB_USERWR; 1343 error = PROC_WRITE(regs, td2, addr); 1344 break; 1345 1346 case PT_GETREGS: 1347 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid, 1348 p->p_pid); 1349 error = PROC_READ(regs, td2, addr); 1350 break; 1351 1352 case PT_SETFPREGS: 1353 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid, 1354 p->p_pid); 1355 td2->td_dbgflags |= TDB_USERWR; 1356 error = PROC_WRITE(fpregs, td2, addr); 1357 break; 1358 1359 case PT_GETFPREGS: 1360 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid, 1361 p->p_pid); 1362 error = PROC_READ(fpregs, td2, addr); 1363 break; 1364 1365 case PT_SETDBREGS: 1366 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid, 1367 p->p_pid); 1368 td2->td_dbgflags |= TDB_USERWR; 1369 error = PROC_WRITE(dbregs, td2, addr); 1370 break; 1371 1372 case PT_GETDBREGS: 1373 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid, 1374 p->p_pid); 1375 error = PROC_READ(dbregs, td2, addr); 1376 break; 1377 1378 case PT_LWPINFO: 1379 if (data <= 0 || 1380 #ifdef COMPAT_FREEBSD32 1381 (!wrap32 && data > sizeof(*pl)) || 1382 (wrap32 && data > sizeof(*pl32))) { 1383 #else 1384 data > sizeof(*pl)) { 1385 #endif 1386 error = EINVAL; 1387 break; 1388 } 1389 #ifdef COMPAT_FREEBSD32 1390 if (wrap32) { 1391 pl = &r.pl; 1392 pl32 = addr; 1393 } else 1394 #endif 1395 pl = addr; 1396 bzero(pl, sizeof(*pl)); 1397 pl->pl_lwpid = td2->td_tid; 1398 pl->pl_event = PL_EVENT_NONE; 1399 pl->pl_flags = 0; 1400 if (td2->td_dbgflags & TDB_XSIG) { 1401 pl->pl_event = PL_EVENT_SIGNAL; 1402 if (td2->td_si.si_signo != 0 && 1403 #ifdef COMPAT_FREEBSD32 1404 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo, 1405 pl_siginfo) + sizeof(pl->pl_siginfo)) || 1406 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32, 1407 pl_siginfo) + sizeof(struct siginfo32))) 1408 #else 1409 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo) 1410 + sizeof(pl->pl_siginfo) 1411 #endif 1412 ){ 1413 pl->pl_flags |= PL_FLAG_SI; 1414 pl->pl_siginfo = td2->td_si; 1415 } 1416 } 1417 if (td2->td_dbgflags & TDB_SCE) 1418 pl->pl_flags |= PL_FLAG_SCE; 1419 else if (td2->td_dbgflags & TDB_SCX) 1420 pl->pl_flags |= PL_FLAG_SCX; 1421 if (td2->td_dbgflags & TDB_EXEC) 1422 pl->pl_flags |= PL_FLAG_EXEC; 1423 if (td2->td_dbgflags & TDB_FORK) { 1424 pl->pl_flags |= PL_FLAG_FORKED; 1425 pl->pl_child_pid = td2->td_dbg_forked; 1426 if (td2->td_dbgflags & TDB_VFORK) 1427 pl->pl_flags |= PL_FLAG_VFORKED; 1428 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) == 1429 TDB_VFORK) 1430 pl->pl_flags |= PL_FLAG_VFORK_DONE; 1431 if (td2->td_dbgflags & TDB_CHILD) 1432 pl->pl_flags |= PL_FLAG_CHILD; 1433 if (td2->td_dbgflags & TDB_BORN) 1434 pl->pl_flags |= PL_FLAG_BORN; 1435 if (td2->td_dbgflags & TDB_EXIT) 1436 pl->pl_flags |= PL_FLAG_EXITED; 1437 pl->pl_sigmask = td2->td_sigmask; 1438 pl->pl_siglist = td2->td_siglist; 1439 strcpy(pl->pl_tdname, td2->td_name); 1440 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) { 1441 pl->pl_syscall_code = td2->td_sa.code; 1442 pl->pl_syscall_narg = td2->td_sa.narg; 1443 } else { 1444 pl->pl_syscall_code = 0; 1445 pl->pl_syscall_narg = 0; 1446 } 1447 #ifdef COMPAT_FREEBSD32 1448 if (wrap32) 1449 ptrace_lwpinfo_to32(pl, pl32); 1450 #endif 1451 CTR6(KTR_PTRACE, 1452 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d", 1453 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags, 1454 pl->pl_child_pid, pl->pl_syscall_code); 1455 break; 1456 1457 case PT_GETNUMLWPS: 1458 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid, 1459 p->p_numthreads); 1460 td->td_retval[0] = p->p_numthreads; 1461 break; 1462 1463 case PT_GETLWPLIST: 1464 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d", 1465 p->p_pid, data, p->p_numthreads); 1466 if (data <= 0) { 1467 error = EINVAL; 1468 break; 1469 } 1470 num = imin(p->p_numthreads, data); 1471 PROC_UNLOCK(p); 1472 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK); 1473 tmp = 0; 1474 PROC_LOCK(p); 1475 FOREACH_THREAD_IN_PROC(p, td2) { 1476 if (tmp >= num) 1477 break; 1478 buf[tmp++] = td2->td_tid; 1479 } 1480 PROC_UNLOCK(p); 1481 error = copyout(buf, addr, tmp * sizeof(lwpid_t)); 1482 free(buf, M_TEMP); 1483 if (!error) 1484 td->td_retval[0] = tmp; 1485 PROC_LOCK(p); 1486 break; 1487 1488 case PT_VM_TIMESTAMP: 1489 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d", 1490 p->p_pid, p->p_vmspace->vm_map.timestamp); 1491 td->td_retval[0] = p->p_vmspace->vm_map.timestamp; 1492 break; 1493 1494 case PT_VM_ENTRY: 1495 PROC_UNLOCK(p); 1496 #ifdef COMPAT_FREEBSD32 1497 if (wrap32) 1498 error = ptrace_vm_entry32(td, p, addr); 1499 else 1500 #endif 1501 error = ptrace_vm_entry(td, p, addr); 1502 PROC_LOCK(p); 1503 break; 1504 1505 default: 1506 #ifdef __HAVE_PTRACE_MACHDEP 1507 if (req >= PT_FIRSTMACH) { 1508 PROC_UNLOCK(p); 1509 error = cpu_ptrace(td2, req, addr, data); 1510 PROC_LOCK(p); 1511 } else 1512 #endif 1513 /* Unknown request. */ 1514 error = EINVAL; 1515 break; 1516 } 1517 1518 out: 1519 /* Drop our hold on this process now that the request has completed. */ 1520 _PRELE(p); 1521 fail: 1522 PROC_UNLOCK(p); 1523 if (proctree_locked) 1524 sx_xunlock(&proctree_lock); 1525 return (error); 1526 } 1527 #undef PROC_READ 1528 #undef PROC_WRITE 1529 1530 /* 1531 * Stop a process because of a debugging event; 1532 * stay stopped until p->p_step is cleared 1533 * (cleared by PIOCCONT in procfs). 1534 */ 1535 void 1536 stopevent(struct proc *p, unsigned int event, unsigned int val) 1537 { 1538 1539 PROC_LOCK_ASSERT(p, MA_OWNED); 1540 p->p_step = 1; 1541 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event, 1542 val); 1543 do { 1544 if (event != S_EXIT) 1545 p->p_xsig = val; 1546 p->p_xthread = NULL; 1547 p->p_stype = event; /* Which event caused the stop? */ 1548 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */ 1549 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0); 1550 } while (p->p_step); 1551 }
Cache object: 45eb9f5c7a941f28be6d4b868c70652e
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