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_vm_entry32 {
80 int pve_entry;
81 int pve_timestamp;
82 uint32_t pve_start;
83 uint32_t pve_end;
84 uint32_t pve_offset;
85 u_int pve_prot;
86 u_int pve_pathlen;
87 int32_t pve_fileid;
88 u_int pve_fsid;
89 uint32_t pve_path;
90 };
91 #endif
92
93 /*
94 * Functions implemented using PROC_ACTION():
95 *
96 * proc_read_regs(proc, regs)
97 * Get the current user-visible register set from the process
98 * and copy it into the regs structure (<machine/reg.h>).
99 * The process is stopped at the time read_regs is called.
100 *
101 * proc_write_regs(proc, regs)
102 * Update the current register set from the passed in regs
103 * structure. Take care to avoid clobbering special CPU
104 * registers or privileged bits in the PSL.
105 * Depending on the architecture this may have fix-up work to do,
106 * especially if the IAR or PCW are modified.
107 * The process is stopped at the time write_regs is called.
108 *
109 * proc_read_fpregs, proc_write_fpregs
110 * deal with the floating point register set, otherwise as above.
111 *
112 * proc_read_dbregs, proc_write_dbregs
113 * deal with the processor debug register set, otherwise as above.
114 *
115 * proc_sstep(proc)
116 * Arrange for the process to trap after executing a single instruction.
117 */
118
119 #define PROC_ACTION(action) do { \
120 int error; \
121 \
122 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
123 if ((td->td_proc->p_flag & P_INMEM) == 0) \
124 error = EIO; \
125 else \
126 error = (action); \
127 return (error); \
128 } while(0)
129
130 int
proc_read_regs(struct thread * td,struct reg * regs)131 proc_read_regs(struct thread *td, struct reg *regs)
132 {
133
134 PROC_ACTION(fill_regs(td, regs));
135 }
136
137 int
proc_write_regs(struct thread * td,struct reg * regs)138 proc_write_regs(struct thread *td, struct reg *regs)
139 {
140
141 PROC_ACTION(set_regs(td, regs));
142 }
143
144 int
proc_read_dbregs(struct thread * td,struct dbreg * dbregs)145 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
146 {
147
148 PROC_ACTION(fill_dbregs(td, dbregs));
149 }
150
151 int
proc_write_dbregs(struct thread * td,struct dbreg * dbregs)152 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
153 {
154
155 PROC_ACTION(set_dbregs(td, dbregs));
156 }
157
158 /*
159 * Ptrace doesn't support fpregs at all, and there are no security holes
160 * or translations for fpregs, so we can just copy them.
161 */
162 int
proc_read_fpregs(struct thread * td,struct fpreg * fpregs)163 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
164 {
165
166 PROC_ACTION(fill_fpregs(td, fpregs));
167 }
168
169 int
proc_write_fpregs(struct thread * td,struct fpreg * fpregs)170 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
171 {
172
173 PROC_ACTION(set_fpregs(td, fpregs));
174 }
175
176 #ifdef COMPAT_FREEBSD32
177 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
178 int
proc_read_regs32(struct thread * td,struct reg32 * regs32)179 proc_read_regs32(struct thread *td, struct reg32 *regs32)
180 {
181
182 PROC_ACTION(fill_regs32(td, regs32));
183 }
184
185 int
proc_write_regs32(struct thread * td,struct reg32 * regs32)186 proc_write_regs32(struct thread *td, struct reg32 *regs32)
187 {
188
189 PROC_ACTION(set_regs32(td, regs32));
190 }
191
192 int
proc_read_dbregs32(struct thread * td,struct dbreg32 * dbregs32)193 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
194 {
195
196 PROC_ACTION(fill_dbregs32(td, dbregs32));
197 }
198
199 int
proc_write_dbregs32(struct thread * td,struct dbreg32 * dbregs32)200 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
201 {
202
203 PROC_ACTION(set_dbregs32(td, dbregs32));
204 }
205
206 int
proc_read_fpregs32(struct thread * td,struct fpreg32 * fpregs32)207 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
208 {
209
210 PROC_ACTION(fill_fpregs32(td, fpregs32));
211 }
212
213 int
proc_write_fpregs32(struct thread * td,struct fpreg32 * fpregs32)214 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
215 {
216
217 PROC_ACTION(set_fpregs32(td, fpregs32));
218 }
219 #endif
220
221 int
proc_sstep(struct thread * td)222 proc_sstep(struct thread *td)
223 {
224
225 PROC_ACTION(ptrace_single_step(td));
226 }
227
228 int
proc_rwmem(struct proc * p,struct uio * uio)229 proc_rwmem(struct proc *p, struct uio *uio)
230 {
231 vm_map_t map;
232 vm_offset_t pageno; /* page number */
233 vm_prot_t reqprot;
234 int error, fault_flags, page_offset, writing;
235
236 /*
237 * Assert that someone has locked this vmspace. (Should be
238 * curthread but we can't assert that.) This keeps the process
239 * from exiting out from under us until this operation completes.
240 */
241 PROC_ASSERT_HELD(p);
242 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
243
244 /*
245 * The map we want...
246 */
247 map = &p->p_vmspace->vm_map;
248
249 /*
250 * If we are writing, then we request vm_fault() to create a private
251 * copy of each page. Since these copies will not be writeable by the
252 * process, we must explicity request that they be dirtied.
253 */
254 writing = uio->uio_rw == UIO_WRITE;
255 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
256 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
257
258 /*
259 * Only map in one page at a time. We don't have to, but it
260 * makes things easier. This way is trivial - right?
261 */
262 do {
263 vm_offset_t uva;
264 u_int len;
265 vm_page_t m;
266
267 uva = (vm_offset_t)uio->uio_offset;
268
269 /*
270 * Get the page number of this segment.
271 */
272 pageno = trunc_page(uva);
273 page_offset = uva - pageno;
274
275 /*
276 * How many bytes to copy
277 */
278 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
279
280 /*
281 * Fault and hold the page on behalf of the process.
282 */
283 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
284 if (error != KERN_SUCCESS) {
285 if (error == KERN_RESOURCE_SHORTAGE)
286 error = ENOMEM;
287 else
288 error = EFAULT;
289 break;
290 }
291
292 /*
293 * Now do the i/o move.
294 */
295 error = uiomove_fromphys(&m, page_offset, len, uio);
296
297 /* Make the I-cache coherent for breakpoints. */
298 if (writing && error == 0) {
299 vm_map_lock_read(map);
300 if (vm_map_check_protection(map, pageno, pageno +
301 PAGE_SIZE, VM_PROT_EXECUTE))
302 vm_sync_icache(map, uva, len);
303 vm_map_unlock_read(map);
304 }
305
306 /*
307 * Release the page.
308 */
309 vm_page_lock(m);
310 vm_page_unhold(m);
311 vm_page_unlock(m);
312
313 } while (error == 0 && uio->uio_resid > 0);
314
315 return (error);
316 }
317
318 static ssize_t
proc_iop(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len,enum uio_rw rw)319 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
320 size_t len, enum uio_rw rw)
321 {
322 struct iovec iov;
323 struct uio uio;
324 ssize_t slen;
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 proc_rwmem(p, &uio);
339 if (uio.uio_resid == slen)
340 return (-1);
341 return (slen - uio.uio_resid);
342 }
343
344 ssize_t
proc_readmem(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len)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
proc_writemem(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len)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
ptrace_vm_entry(struct thread * td,struct proc * p,struct ptrace_vm_entry * pve)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 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0,
392 ("Submap in map header"));
393 while ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
394 entry = entry->next;
395 index++;
396 }
397 if (entry == &map->header) {
398 error = ENOENT;
399 break;
400 }
401
402 /* We got an entry. */
403 pve->pve_entry = index + 1;
404 pve->pve_timestamp = map->timestamp;
405 pve->pve_start = entry->start;
406 pve->pve_end = entry->end - 1;
407 pve->pve_offset = entry->offset;
408 pve->pve_prot = entry->protection;
409
410 /* Backing object's path needed? */
411 if (pve->pve_pathlen == 0)
412 break;
413
414 pathlen = pve->pve_pathlen;
415 pve->pve_pathlen = 0;
416
417 obj = entry->object.vm_object;
418 if (obj != NULL)
419 VM_OBJECT_RLOCK(obj);
420 } while (0);
421
422 vm_map_unlock_read(map);
423
424 pve->pve_fsid = VNOVAL;
425 pve->pve_fileid = VNOVAL;
426
427 if (error == 0 && obj != NULL) {
428 lobj = obj;
429 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
430 if (tobj != obj)
431 VM_OBJECT_RLOCK(tobj);
432 if (lobj != obj)
433 VM_OBJECT_RUNLOCK(lobj);
434 lobj = tobj;
435 pve->pve_offset += tobj->backing_object_offset;
436 }
437 vp = vm_object_vnode(lobj);
438 if (vp != NULL)
439 vref(vp);
440 if (lobj != obj)
441 VM_OBJECT_RUNLOCK(lobj);
442 VM_OBJECT_RUNLOCK(obj);
443
444 if (vp != NULL) {
445 freepath = NULL;
446 fullpath = NULL;
447 vn_fullpath(td, vp, &fullpath, &freepath);
448 vn_lock(vp, LK_SHARED | LK_RETRY);
449 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
450 pve->pve_fileid = vattr.va_fileid;
451 pve->pve_fsid = vattr.va_fsid;
452 }
453 vput(vp);
454
455 if (fullpath != NULL) {
456 pve->pve_pathlen = strlen(fullpath) + 1;
457 if (pve->pve_pathlen <= pathlen) {
458 error = copyout(fullpath, pve->pve_path,
459 pve->pve_pathlen);
460 } else
461 error = ENAMETOOLONG;
462 }
463 if (freepath != NULL)
464 free(freepath, M_TEMP);
465 }
466 }
467 vmspace_free(vm);
468 if (error == 0)
469 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
470 p->p_pid, pve->pve_entry, pve->pve_start);
471
472 return (error);
473 }
474
475 #ifdef COMPAT_FREEBSD32
476 static int
ptrace_vm_entry32(struct thread * td,struct proc * p,struct ptrace_vm_entry32 * pve32)477 ptrace_vm_entry32(struct thread *td, struct proc *p,
478 struct ptrace_vm_entry32 *pve32)
479 {
480 struct ptrace_vm_entry pve;
481 int error;
482
483 pve.pve_entry = pve32->pve_entry;
484 pve.pve_pathlen = pve32->pve_pathlen;
485 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
486
487 error = ptrace_vm_entry(td, p, &pve);
488 if (error == 0) {
489 pve32->pve_entry = pve.pve_entry;
490 pve32->pve_timestamp = pve.pve_timestamp;
491 pve32->pve_start = pve.pve_start;
492 pve32->pve_end = pve.pve_end;
493 pve32->pve_offset = pve.pve_offset;
494 pve32->pve_prot = pve.pve_prot;
495 pve32->pve_fileid = pve.pve_fileid;
496 pve32->pve_fsid = pve.pve_fsid;
497 }
498
499 pve32->pve_pathlen = pve.pve_pathlen;
500 return (error);
501 }
502
503 static void
ptrace_lwpinfo_to32(const struct ptrace_lwpinfo * pl,struct ptrace_lwpinfo32 * pl32)504 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
505 struct ptrace_lwpinfo32 *pl32)
506 {
507
508 bzero(pl32, sizeof(*pl32));
509 pl32->pl_lwpid = pl->pl_lwpid;
510 pl32->pl_event = pl->pl_event;
511 pl32->pl_flags = pl->pl_flags;
512 pl32->pl_sigmask = pl->pl_sigmask;
513 pl32->pl_siglist = pl->pl_siglist;
514 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
515 strcpy(pl32->pl_tdname, pl->pl_tdname);
516 pl32->pl_child_pid = pl->pl_child_pid;
517 pl32->pl_syscall_code = pl->pl_syscall_code;
518 pl32->pl_syscall_narg = pl->pl_syscall_narg;
519 }
520 #endif /* COMPAT_FREEBSD32 */
521
522 /*
523 * Process debugging system call.
524 */
525 #ifndef _SYS_SYSPROTO_H_
526 struct ptrace_args {
527 int req;
528 pid_t pid;
529 caddr_t addr;
530 int data;
531 };
532 #endif
533
534 #ifdef COMPAT_FREEBSD32
535 /*
536 * This CPP subterfuge is to try and reduce the number of ifdefs in
537 * the body of the code.
538 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
539 * becomes either:
540 * copyin(uap->addr, &r.reg, sizeof r.reg);
541 * or
542 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
543 * .. except this is done at runtime.
544 */
545 #define BZERO(a, s) wrap32 ? \
546 bzero(a ## 32, s ## 32) : \
547 bzero(a, s)
548 #define COPYIN(u, k, s) wrap32 ? \
549 copyin(u, k ## 32, s ## 32) : \
550 copyin(u, k, s)
551 #define COPYOUT(k, u, s) wrap32 ? \
552 copyout(k ## 32, u, s ## 32) : \
553 copyout(k, u, s)
554 #else
555 #define BZERO(a, s) bzero(a, s)
556 #define COPYIN(u, k, s) copyin(u, k, s)
557 #define COPYOUT(k, u, s) copyout(k, u, s)
558 #endif
559 int
sys_ptrace(struct thread * td,struct ptrace_args * uap)560 sys_ptrace(struct thread *td, struct ptrace_args *uap)
561 {
562 /*
563 * XXX this obfuscation is to reduce stack usage, but the register
564 * structs may be too large to put on the stack anyway.
565 */
566 union {
567 struct ptrace_io_desc piod;
568 struct ptrace_lwpinfo pl;
569 struct ptrace_vm_entry pve;
570 struct dbreg dbreg;
571 struct fpreg fpreg;
572 struct reg reg;
573 #ifdef COMPAT_FREEBSD32
574 struct dbreg32 dbreg32;
575 struct fpreg32 fpreg32;
576 struct reg32 reg32;
577 struct ptrace_io_desc32 piod32;
578 struct ptrace_lwpinfo32 pl32;
579 struct ptrace_vm_entry32 pve32;
580 #endif
581 char args[sizeof(td->td_sa.args)];
582 int ptevents;
583 } r;
584 void *addr;
585 int error = 0;
586 #ifdef COMPAT_FREEBSD32
587 int wrap32 = 0;
588
589 if (SV_CURPROC_FLAG(SV_ILP32))
590 wrap32 = 1;
591 #endif
592 AUDIT_ARG_PID(uap->pid);
593 AUDIT_ARG_CMD(uap->req);
594 AUDIT_ARG_VALUE(uap->data);
595 addr = &r;
596 switch (uap->req) {
597 case PT_GET_EVENT_MASK:
598 case PT_LWPINFO:
599 case PT_GET_SC_ARGS:
600 break;
601 case PT_GETREGS:
602 BZERO(&r.reg, sizeof r.reg);
603 break;
604 case PT_GETFPREGS:
605 BZERO(&r.fpreg, sizeof r.fpreg);
606 break;
607 case PT_GETDBREGS:
608 BZERO(&r.dbreg, sizeof r.dbreg);
609 break;
610 case PT_SETREGS:
611 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
612 break;
613 case PT_SETFPREGS:
614 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
615 break;
616 case PT_SETDBREGS:
617 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
618 break;
619 case PT_SET_EVENT_MASK:
620 if (uap->data != sizeof(r.ptevents))
621 error = EINVAL;
622 else
623 error = copyin(uap->addr, &r.ptevents, uap->data);
624 break;
625 case PT_IO:
626 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
627 break;
628 case PT_VM_ENTRY:
629 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
630 break;
631 default:
632 addr = uap->addr;
633 break;
634 }
635 if (error)
636 return (error);
637
638 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
639 if (error)
640 return (error);
641
642 switch (uap->req) {
643 case PT_VM_ENTRY:
644 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
645 break;
646 case PT_IO:
647 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
648 break;
649 case PT_GETREGS:
650 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
651 break;
652 case PT_GETFPREGS:
653 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
654 break;
655 case PT_GETDBREGS:
656 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
657 break;
658 case PT_GET_EVENT_MASK:
659 /* NB: The size in uap->data is validated in kern_ptrace(). */
660 error = copyout(&r.ptevents, uap->addr, uap->data);
661 break;
662 case PT_LWPINFO:
663 /* NB: The size in uap->data is validated in kern_ptrace(). */
664 error = copyout(&r.pl, uap->addr, uap->data);
665 break;
666 case PT_GET_SC_ARGS:
667 error = copyout(r.args, uap->addr, MIN(uap->data,
668 sizeof(r.args)));
669 break;
670 }
671
672 return (error);
673 }
674 #undef COPYIN
675 #undef COPYOUT
676 #undef BZERO
677
678 #ifdef COMPAT_FREEBSD32
679 /*
680 * PROC_READ(regs, td2, addr);
681 * becomes either:
682 * proc_read_regs(td2, addr);
683 * or
684 * proc_read_regs32(td2, addr);
685 * .. except this is done at runtime. There is an additional
686 * complication in that PROC_WRITE disallows 32 bit consumers
687 * from writing to 64 bit address space targets.
688 */
689 #define PROC_READ(w, t, a) wrap32 ? \
690 proc_read_ ## w ## 32(t, a) : \
691 proc_read_ ## w (t, a)
692 #define PROC_WRITE(w, t, a) wrap32 ? \
693 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
694 proc_write_ ## w (t, a)
695 #else
696 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
697 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
698 #endif
699
700 void
proc_set_traced(struct proc * p,bool stop)701 proc_set_traced(struct proc *p, bool stop)
702 {
703
704 sx_assert(&proctree_lock, SX_XLOCKED);
705 PROC_LOCK_ASSERT(p, MA_OWNED);
706 p->p_flag |= P_TRACED;
707 if (stop)
708 p->p_flag2 |= P2_PTRACE_FSTP;
709 p->p_ptevents = PTRACE_DEFAULT;
710 }
711
712 int
kern_ptrace(struct thread * td,int req,pid_t pid,void * addr,int data)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 proc_reparent(p, td->td_proc, false);
933 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
934 p->p_oppid);
935
936 sx_xunlock(&proctree_lock);
937 proctree_locked = 0;
938 MPASS(p->p_xthread == NULL);
939 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
940
941 /*
942 * If already stopped due to a stop signal, clear the
943 * existing stop before triggering a traced SIGSTOP.
944 */
945 if ((p->p_flag & P_STOPPED_SIG) != 0) {
946 PROC_SLOCK(p);
947 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
948 thread_unsuspend(p);
949 PROC_SUNLOCK(p);
950 }
951
952 kern_psignal(p, SIGSTOP);
953 break;
954
955 case PT_CLEARSTEP:
956 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
957 p->p_pid);
958 error = ptrace_clear_single_step(td2);
959 break;
960
961 case PT_SETSTEP:
962 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
963 p->p_pid);
964 error = ptrace_single_step(td2);
965 break;
966
967 case PT_SUSPEND:
968 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
969 p->p_pid);
970 td2->td_dbgflags |= TDB_SUSPEND;
971 thread_lock(td2);
972 td2->td_flags |= TDF_NEEDSUSPCHK;
973 thread_unlock(td2);
974 break;
975
976 case PT_RESUME:
977 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
978 p->p_pid);
979 td2->td_dbgflags &= ~TDB_SUSPEND;
980 break;
981
982 case PT_FOLLOW_FORK:
983 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
984 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
985 data ? "enabled" : "disabled");
986 if (data)
987 p->p_ptevents |= PTRACE_FORK;
988 else
989 p->p_ptevents &= ~PTRACE_FORK;
990 break;
991
992 case PT_LWP_EVENTS:
993 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
994 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
995 data ? "enabled" : "disabled");
996 if (data)
997 p->p_ptevents |= PTRACE_LWP;
998 else
999 p->p_ptevents &= ~PTRACE_LWP;
1000 break;
1001
1002 case PT_GET_EVENT_MASK:
1003 if (data != sizeof(p->p_ptevents)) {
1004 error = EINVAL;
1005 break;
1006 }
1007 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
1008 p->p_ptevents);
1009 *(int *)addr = p->p_ptevents;
1010 break;
1011
1012 case PT_SET_EVENT_MASK:
1013 if (data != sizeof(p->p_ptevents)) {
1014 error = EINVAL;
1015 break;
1016 }
1017 tmp = *(int *)addr;
1018 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1019 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
1020 error = EINVAL;
1021 break;
1022 }
1023 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1024 p->p_pid, p->p_ptevents, tmp);
1025 p->p_ptevents = tmp;
1026 break;
1027
1028 case PT_GET_SC_ARGS:
1029 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
1030 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
1031 #ifdef COMPAT_FREEBSD32
1032 || (wrap32 && !safe)
1033 #endif
1034 ) {
1035 error = EINVAL;
1036 break;
1037 }
1038 bzero(addr, sizeof(td2->td_sa.args));
1039 #ifdef COMPAT_FREEBSD32
1040 if (wrap32)
1041 for (num = 0; num < nitems(td2->td_sa.args); num++)
1042 ((uint32_t *)addr)[num] = (uint32_t)
1043 td2->td_sa.args[num];
1044 else
1045 #endif
1046 bcopy(td2->td_sa.args, addr, td2->td_sa.narg *
1047 sizeof(register_t));
1048 break;
1049
1050 case PT_STEP:
1051 case PT_CONTINUE:
1052 case PT_TO_SCE:
1053 case PT_TO_SCX:
1054 case PT_SYSCALL:
1055 case PT_DETACH:
1056 /* Zero means do not send any signal */
1057 if (data < 0 || data > _SIG_MAXSIG) {
1058 error = EINVAL;
1059 break;
1060 }
1061
1062 switch (req) {
1063 case PT_STEP:
1064 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
1065 td2->td_tid, p->p_pid, data);
1066 error = ptrace_single_step(td2);
1067 if (error)
1068 goto out;
1069 break;
1070 case PT_CONTINUE:
1071 case PT_TO_SCE:
1072 case PT_TO_SCX:
1073 case PT_SYSCALL:
1074 if (addr != (void *)1) {
1075 error = ptrace_set_pc(td2,
1076 (u_long)(uintfptr_t)addr);
1077 if (error)
1078 goto out;
1079 }
1080 switch (req) {
1081 case PT_TO_SCE:
1082 p->p_ptevents |= PTRACE_SCE;
1083 CTR4(KTR_PTRACE,
1084 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1085 p->p_pid, p->p_ptevents,
1086 (u_long)(uintfptr_t)addr, data);
1087 break;
1088 case PT_TO_SCX:
1089 p->p_ptevents |= PTRACE_SCX;
1090 CTR4(KTR_PTRACE,
1091 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1092 p->p_pid, p->p_ptevents,
1093 (u_long)(uintfptr_t)addr, data);
1094 break;
1095 case PT_SYSCALL:
1096 p->p_ptevents |= PTRACE_SYSCALL;
1097 CTR4(KTR_PTRACE,
1098 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1099 p->p_pid, p->p_ptevents,
1100 (u_long)(uintfptr_t)addr, data);
1101 break;
1102 case PT_CONTINUE:
1103 CTR3(KTR_PTRACE,
1104 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1105 p->p_pid, (u_long)(uintfptr_t)addr, data);
1106 break;
1107 }
1108 break;
1109 case PT_DETACH:
1110 /*
1111 * Reset the process parent.
1112 *
1113 * NB: This clears P_TRACED before reparenting
1114 * a detached process back to its original
1115 * parent. Otherwise the debugee will be set
1116 * as an orphan of the debugger.
1117 */
1118 p->p_flag &= ~(P_TRACED | P_WAITED);
1119 if (p->p_oppid != p->p_pptr->p_pid) {
1120 PROC_LOCK(p->p_pptr);
1121 sigqueue_take(p->p_ksi);
1122 PROC_UNLOCK(p->p_pptr);
1123
1124 pp = proc_realparent(p);
1125 proc_reparent(p, pp, false);
1126 if (pp == initproc)
1127 p->p_sigparent = SIGCHLD;
1128 CTR3(KTR_PTRACE,
1129 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1130 p->p_pid, pp->p_pid, data);
1131 } else
1132 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1133 p->p_pid, data);
1134 p->p_ptevents = 0;
1135 FOREACH_THREAD_IN_PROC(p, td3) {
1136 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1137 sigqueue_delete(&td3->td_sigqueue,
1138 SIGSTOP);
1139 }
1140 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
1141 TDB_SUSPEND);
1142 }
1143
1144 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1145 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1146 p->p_flag2 &= ~P2_PTRACE_FSTP;
1147 }
1148
1149 /* should we send SIGCHLD? */
1150 /* childproc_continued(p); */
1151 break;
1152 }
1153
1154 sx_xunlock(&proctree_lock);
1155 proctree_locked = 0;
1156
1157 sendsig:
1158 MPASS(proctree_locked == 0);
1159
1160 /*
1161 * Clear the pending event for the thread that just
1162 * reported its event (p_xthread). This may not be
1163 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1164 * the debugger is resuming a different thread.
1165 *
1166 * Deliver any pending signal via the reporting thread.
1167 */
1168 MPASS(p->p_xthread != NULL);
1169 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
1170 p->p_xthread->td_xsig = data;
1171 p->p_xthread = NULL;
1172 p->p_xsig = data;
1173
1174 /*
1175 * P_WKILLED is insurance that a PT_KILL/SIGKILL
1176 * always works immediately, even if another thread is
1177 * unsuspended first and attempts to handle a
1178 * different signal or if the POSIX.1b style signal
1179 * queue cannot accommodate any new signals.
1180 */
1181 if (data == SIGKILL)
1182 proc_wkilled(p);
1183
1184 /*
1185 * Unsuspend all threads. To leave a thread
1186 * suspended, use PT_SUSPEND to suspend it before
1187 * continuing the process.
1188 */
1189 PROC_SLOCK(p);
1190 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
1191 thread_unsuspend(p);
1192 PROC_SUNLOCK(p);
1193 break;
1194
1195 case PT_WRITE_I:
1196 case PT_WRITE_D:
1197 td2->td_dbgflags |= TDB_USERWR;
1198 PROC_UNLOCK(p);
1199 error = 0;
1200 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1201 sizeof(int)) != sizeof(int))
1202 error = ENOMEM;
1203 else
1204 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1205 p->p_pid, addr, data);
1206 PROC_LOCK(p);
1207 break;
1208
1209 case PT_READ_I:
1210 case PT_READ_D:
1211 PROC_UNLOCK(p);
1212 error = tmp = 0;
1213 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1214 sizeof(int)) != sizeof(int))
1215 error = ENOMEM;
1216 else
1217 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1218 p->p_pid, addr, tmp);
1219 td->td_retval[0] = tmp;
1220 PROC_LOCK(p);
1221 break;
1222
1223 case PT_IO:
1224 #ifdef COMPAT_FREEBSD32
1225 if (wrap32) {
1226 piod32 = addr;
1227 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1228 iov.iov_len = piod32->piod_len;
1229 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1230 uio.uio_resid = piod32->piod_len;
1231 } else
1232 #endif
1233 {
1234 piod = addr;
1235 iov.iov_base = piod->piod_addr;
1236 iov.iov_len = piod->piod_len;
1237 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1238 uio.uio_resid = piod->piod_len;
1239 }
1240 uio.uio_iov = &iov;
1241 uio.uio_iovcnt = 1;
1242 uio.uio_segflg = UIO_USERSPACE;
1243 uio.uio_td = td;
1244 #ifdef COMPAT_FREEBSD32
1245 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1246 #else
1247 tmp = piod->piod_op;
1248 #endif
1249 switch (tmp) {
1250 case PIOD_READ_D:
1251 case PIOD_READ_I:
1252 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1253 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1254 uio.uio_rw = UIO_READ;
1255 break;
1256 case PIOD_WRITE_D:
1257 case PIOD_WRITE_I:
1258 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1259 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1260 td2->td_dbgflags |= TDB_USERWR;
1261 uio.uio_rw = UIO_WRITE;
1262 break;
1263 default:
1264 error = EINVAL;
1265 goto out;
1266 }
1267 PROC_UNLOCK(p);
1268 error = proc_rwmem(p, &uio);
1269 #ifdef COMPAT_FREEBSD32
1270 if (wrap32)
1271 piod32->piod_len -= uio.uio_resid;
1272 else
1273 #endif
1274 piod->piod_len -= uio.uio_resid;
1275 PROC_LOCK(p);
1276 break;
1277
1278 case PT_KILL:
1279 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1280 data = SIGKILL;
1281 goto sendsig; /* in PT_CONTINUE above */
1282
1283 case PT_SETREGS:
1284 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1285 p->p_pid);
1286 td2->td_dbgflags |= TDB_USERWR;
1287 error = PROC_WRITE(regs, td2, addr);
1288 break;
1289
1290 case PT_GETREGS:
1291 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1292 p->p_pid);
1293 error = PROC_READ(regs, td2, addr);
1294 break;
1295
1296 case PT_SETFPREGS:
1297 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1298 p->p_pid);
1299 td2->td_dbgflags |= TDB_USERWR;
1300 error = PROC_WRITE(fpregs, td2, addr);
1301 break;
1302
1303 case PT_GETFPREGS:
1304 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1305 p->p_pid);
1306 error = PROC_READ(fpregs, td2, addr);
1307 break;
1308
1309 case PT_SETDBREGS:
1310 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1311 p->p_pid);
1312 td2->td_dbgflags |= TDB_USERWR;
1313 error = PROC_WRITE(dbregs, td2, addr);
1314 break;
1315
1316 case PT_GETDBREGS:
1317 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1318 p->p_pid);
1319 error = PROC_READ(dbregs, td2, addr);
1320 break;
1321
1322 case PT_LWPINFO:
1323 if (data <= 0 ||
1324 #ifdef COMPAT_FREEBSD32
1325 (!wrap32 && data > sizeof(*pl)) ||
1326 (wrap32 && data > sizeof(*pl32))) {
1327 #else
1328 data > sizeof(*pl)) {
1329 #endif
1330 error = EINVAL;
1331 break;
1332 }
1333 #ifdef COMPAT_FREEBSD32
1334 if (wrap32) {
1335 pl = &plr;
1336 pl32 = addr;
1337 } else
1338 #endif
1339 pl = addr;
1340 bzero(pl, sizeof(*pl));
1341 pl->pl_lwpid = td2->td_tid;
1342 pl->pl_event = PL_EVENT_NONE;
1343 pl->pl_flags = 0;
1344 if (td2->td_dbgflags & TDB_XSIG) {
1345 pl->pl_event = PL_EVENT_SIGNAL;
1346 if (td2->td_si.si_signo != 0 &&
1347 #ifdef COMPAT_FREEBSD32
1348 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1349 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1350 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1351 pl_siginfo) + sizeof(struct siginfo32)))
1352 #else
1353 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1354 + sizeof(pl->pl_siginfo)
1355 #endif
1356 ){
1357 pl->pl_flags |= PL_FLAG_SI;
1358 pl->pl_siginfo = td2->td_si;
1359 }
1360 }
1361 if (td2->td_dbgflags & TDB_SCE)
1362 pl->pl_flags |= PL_FLAG_SCE;
1363 else if (td2->td_dbgflags & TDB_SCX)
1364 pl->pl_flags |= PL_FLAG_SCX;
1365 if (td2->td_dbgflags & TDB_EXEC)
1366 pl->pl_flags |= PL_FLAG_EXEC;
1367 if (td2->td_dbgflags & TDB_FORK) {
1368 pl->pl_flags |= PL_FLAG_FORKED;
1369 pl->pl_child_pid = td2->td_dbg_forked;
1370 if (td2->td_dbgflags & TDB_VFORK)
1371 pl->pl_flags |= PL_FLAG_VFORKED;
1372 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1373 TDB_VFORK)
1374 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1375 if (td2->td_dbgflags & TDB_CHILD)
1376 pl->pl_flags |= PL_FLAG_CHILD;
1377 if (td2->td_dbgflags & TDB_BORN)
1378 pl->pl_flags |= PL_FLAG_BORN;
1379 if (td2->td_dbgflags & TDB_EXIT)
1380 pl->pl_flags |= PL_FLAG_EXITED;
1381 pl->pl_sigmask = td2->td_sigmask;
1382 pl->pl_siglist = td2->td_siglist;
1383 strcpy(pl->pl_tdname, td2->td_name);
1384 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1385 pl->pl_syscall_code = td2->td_sa.code;
1386 pl->pl_syscall_narg = td2->td_sa.narg;
1387 } else {
1388 pl->pl_syscall_code = 0;
1389 pl->pl_syscall_narg = 0;
1390 }
1391 #ifdef COMPAT_FREEBSD32
1392 if (wrap32)
1393 ptrace_lwpinfo_to32(pl, pl32);
1394 #endif
1395 CTR6(KTR_PTRACE,
1396 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1397 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1398 pl->pl_child_pid, pl->pl_syscall_code);
1399 break;
1400
1401 case PT_GETNUMLWPS:
1402 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1403 p->p_numthreads);
1404 td->td_retval[0] = p->p_numthreads;
1405 break;
1406
1407 case PT_GETLWPLIST:
1408 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1409 p->p_pid, data, p->p_numthreads);
1410 if (data <= 0) {
1411 error = EINVAL;
1412 break;
1413 }
1414 num = imin(p->p_numthreads, data);
1415 PROC_UNLOCK(p);
1416 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1417 tmp = 0;
1418 PROC_LOCK(p);
1419 FOREACH_THREAD_IN_PROC(p, td2) {
1420 if (tmp >= num)
1421 break;
1422 buf[tmp++] = td2->td_tid;
1423 }
1424 PROC_UNLOCK(p);
1425 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1426 free(buf, M_TEMP);
1427 if (!error)
1428 td->td_retval[0] = tmp;
1429 PROC_LOCK(p);
1430 break;
1431
1432 case PT_VM_TIMESTAMP:
1433 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1434 p->p_pid, p->p_vmspace->vm_map.timestamp);
1435 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1436 break;
1437
1438 case PT_VM_ENTRY:
1439 PROC_UNLOCK(p);
1440 #ifdef COMPAT_FREEBSD32
1441 if (wrap32)
1442 error = ptrace_vm_entry32(td, p, addr);
1443 else
1444 #endif
1445 error = ptrace_vm_entry(td, p, addr);
1446 PROC_LOCK(p);
1447 break;
1448
1449 default:
1450 #ifdef __HAVE_PTRACE_MACHDEP
1451 if (req >= PT_FIRSTMACH) {
1452 PROC_UNLOCK(p);
1453 error = cpu_ptrace(td2, req, addr, data);
1454 PROC_LOCK(p);
1455 } else
1456 #endif
1457 /* Unknown request. */
1458 error = EINVAL;
1459 break;
1460 }
1461
1462 out:
1463 /* Drop our hold on this process now that the request has completed. */
1464 _PRELE(p);
1465 fail:
1466 PROC_UNLOCK(p);
1467 if (proctree_locked)
1468 sx_xunlock(&proctree_lock);
1469 return (error);
1470 }
1471 #undef PROC_READ
1472 #undef PROC_WRITE
1473
1474 /*
1475 * Stop a process because of a debugging event;
1476 * stay stopped until p->p_step is cleared
1477 * (cleared by PIOCCONT in procfs).
1478 */
1479 void
1480 stopevent(struct proc *p, unsigned int event, unsigned int val)
1481 {
1482
1483 PROC_LOCK_ASSERT(p, MA_OWNED);
1484 p->p_step = 1;
1485 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1486 val);
1487 do {
1488 if (event != S_EXIT)
1489 p->p_xsig = val;
1490 p->p_xthread = NULL;
1491 p->p_stype = event; /* Which event caused the stop? */
1492 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1493 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1494 } while (p->p_step);
1495 }
1496