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 #include <sys/param.h>
36 #include <sys/systm.h>
37 #include <sys/ktr.h>
38 #include <sys/limits.h>
39 #include <sys/lock.h>
40 #include <sys/mutex.h>
41 #include <sys/reg.h>
42 #include <sys/syscallsubr.h>
43 #include <sys/sysent.h>
44 #include <sys/sysproto.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 #include <sys/caprights.h>
54 #include <sys/filedesc.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 #endif
70
71 /* Assert it's safe to unlock a process, e.g. to allocate working memory */
72 #define PROC_ASSERT_TRACEREQ(p) MPASS(((p)->p_flag2 & P2_PTRACEREQ) != 0)
73
74 /*
75 * Functions implemented using PROC_ACTION():
76 *
77 * proc_read_regs(proc, regs)
78 * Get the current user-visible register set from the process
79 * and copy it into the regs structure (<machine/reg.h>).
80 * The process is stopped at the time read_regs is called.
81 *
82 * proc_write_regs(proc, regs)
83 * Update the current register set from the passed in regs
84 * structure. Take care to avoid clobbering special CPU
85 * registers or privileged bits in the PSL.
86 * Depending on the architecture this may have fix-up work to do,
87 * especially if the IAR or PCW are modified.
88 * The process is stopped at the time write_regs is called.
89 *
90 * proc_read_fpregs, proc_write_fpregs
91 * deal with the floating point register set, otherwise as above.
92 *
93 * proc_read_dbregs, proc_write_dbregs
94 * deal with the processor debug register set, otherwise as above.
95 *
96 * proc_sstep(proc)
97 * Arrange for the process to trap after executing a single instruction.
98 */
99
100 #define PROC_ACTION(action) do { \
101 int error; \
102 \
103 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
104 if ((td->td_proc->p_flag & P_INMEM) == 0) \
105 error = EIO; \
106 else \
107 error = (action); \
108 return (error); \
109 } while(0)
110
111 int
proc_read_regs(struct thread * td,struct reg * regs)112 proc_read_regs(struct thread *td, struct reg *regs)
113 {
114
115 PROC_ACTION(fill_regs(td, regs));
116 }
117
118 int
proc_write_regs(struct thread * td,struct reg * regs)119 proc_write_regs(struct thread *td, struct reg *regs)
120 {
121
122 PROC_ACTION(set_regs(td, regs));
123 }
124
125 int
proc_read_dbregs(struct thread * td,struct dbreg * dbregs)126 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
127 {
128
129 PROC_ACTION(fill_dbregs(td, dbregs));
130 }
131
132 int
proc_write_dbregs(struct thread * td,struct dbreg * dbregs)133 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
134 {
135
136 PROC_ACTION(set_dbregs(td, dbregs));
137 }
138
139 /*
140 * Ptrace doesn't support fpregs at all, and there are no security holes
141 * or translations for fpregs, so we can just copy them.
142 */
143 int
proc_read_fpregs(struct thread * td,struct fpreg * fpregs)144 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
145 {
146
147 PROC_ACTION(fill_fpregs(td, fpregs));
148 }
149
150 int
proc_write_fpregs(struct thread * td,struct fpreg * fpregs)151 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
152 {
153
154 PROC_ACTION(set_fpregs(td, fpregs));
155 }
156
157 static struct regset *
proc_find_regset(struct thread * td,int note)158 proc_find_regset(struct thread *td, int note)
159 {
160 struct regset **regsetp, **regset_end, *regset;
161 struct sysentvec *sv;
162
163 sv = td->td_proc->p_sysent;
164 regsetp = sv->sv_regset_begin;
165 if (regsetp == NULL)
166 return (NULL);
167 regset_end = sv->sv_regset_end;
168 MPASS(regset_end != NULL);
169 for (; regsetp < regset_end; regsetp++) {
170 regset = *regsetp;
171 if (regset->note != note)
172 continue;
173
174 return (regset);
175 }
176
177 return (NULL);
178 }
179
180 static int
proc_read_regset(struct thread * td,int note,struct iovec * iov)181 proc_read_regset(struct thread *td, int note, struct iovec *iov)
182 {
183 struct regset *regset;
184 struct proc *p;
185 void *buf;
186 size_t size;
187 int error;
188
189 regset = proc_find_regset(td, note);
190 if (regset == NULL)
191 return (EINVAL);
192
193 if (iov->iov_base == NULL) {
194 iov->iov_len = regset->size;
195 if (iov->iov_len == 0)
196 return (EINVAL);
197
198 return (0);
199 }
200
201 /* The length is wrong, return an error */
202 if (iov->iov_len != regset->size)
203 return (EINVAL);
204
205 if (regset->get == NULL)
206 return (EINVAL);
207
208 error = 0;
209 size = regset->size;
210 p = td->td_proc;
211
212 /* Drop the proc lock while allocating the temp buffer */
213 PROC_ASSERT_TRACEREQ(p);
214 PROC_UNLOCK(p);
215 buf = malloc(size, M_TEMP, M_WAITOK);
216 PROC_LOCK(p);
217
218 if (!regset->get(regset, td, buf, &size)) {
219 error = EINVAL;
220 } else {
221 KASSERT(size == regset->size,
222 ("%s: Getter function changed the size", __func__));
223
224 iov->iov_len = size;
225 PROC_UNLOCK(p);
226 error = copyout(buf, iov->iov_base, size);
227 PROC_LOCK(p);
228 }
229
230 free(buf, M_TEMP);
231
232 return (error);
233 }
234
235 static int
proc_write_regset(struct thread * td,int note,struct iovec * iov)236 proc_write_regset(struct thread *td, int note, struct iovec *iov)
237 {
238 struct regset *regset;
239 struct proc *p;
240 void *buf;
241 size_t size;
242 int error;
243
244 regset = proc_find_regset(td, note);
245 if (regset == NULL)
246 return (EINVAL);
247
248 /* The length is wrong, return an error */
249 if (iov->iov_len != regset->size)
250 return (EINVAL);
251
252 if (regset->set == NULL)
253 return (EINVAL);
254
255 size = regset->size;
256 p = td->td_proc;
257
258 /* Drop the proc lock while allocating the temp buffer */
259 PROC_ASSERT_TRACEREQ(p);
260 PROC_UNLOCK(p);
261 buf = malloc(size, M_TEMP, M_WAITOK);
262 error = copyin(iov->iov_base, buf, size);
263 PROC_LOCK(p);
264
265 if (error == 0) {
266 if (!regset->set(regset, td, buf, size)) {
267 error = EINVAL;
268 }
269 }
270
271 free(buf, M_TEMP);
272
273 return (error);
274 }
275
276 #ifdef COMPAT_FREEBSD32
277 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
278 int
proc_read_regs32(struct thread * td,struct reg32 * regs32)279 proc_read_regs32(struct thread *td, struct reg32 *regs32)
280 {
281
282 PROC_ACTION(fill_regs32(td, regs32));
283 }
284
285 int
proc_write_regs32(struct thread * td,struct reg32 * regs32)286 proc_write_regs32(struct thread *td, struct reg32 *regs32)
287 {
288
289 PROC_ACTION(set_regs32(td, regs32));
290 }
291
292 int
proc_read_dbregs32(struct thread * td,struct dbreg32 * dbregs32)293 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
294 {
295
296 PROC_ACTION(fill_dbregs32(td, dbregs32));
297 }
298
299 int
proc_write_dbregs32(struct thread * td,struct dbreg32 * dbregs32)300 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
301 {
302
303 PROC_ACTION(set_dbregs32(td, dbregs32));
304 }
305
306 int
proc_read_fpregs32(struct thread * td,struct fpreg32 * fpregs32)307 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
308 {
309
310 PROC_ACTION(fill_fpregs32(td, fpregs32));
311 }
312
313 int
proc_write_fpregs32(struct thread * td,struct fpreg32 * fpregs32)314 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
315 {
316
317 PROC_ACTION(set_fpregs32(td, fpregs32));
318 }
319 #endif
320
321 int
proc_sstep(struct thread * td)322 proc_sstep(struct thread *td)
323 {
324
325 PROC_ACTION(ptrace_single_step(td));
326 }
327
328 int
proc_rwmem(struct proc * p,struct uio * uio)329 proc_rwmem(struct proc *p, struct uio *uio)
330 {
331 vm_map_t map;
332 vm_offset_t pageno; /* page number */
333 vm_prot_t reqprot;
334 int error, fault_flags, page_offset, writing;
335
336 /*
337 * Make sure that the process' vmspace remains live.
338 */
339 if (p != curproc)
340 PROC_ASSERT_HELD(p);
341 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
342
343 /*
344 * The map we want...
345 */
346 map = &p->p_vmspace->vm_map;
347
348 /*
349 * If we are writing, then we request vm_fault() to create a private
350 * copy of each page. Since these copies will not be writeable by the
351 * process, we must explicitly request that they be dirtied.
352 */
353 writing = uio->uio_rw == UIO_WRITE;
354 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
355 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
356
357 /*
358 * Only map in one page at a time. We don't have to, but it
359 * makes things easier. This way is trivial - right?
360 */
361 do {
362 vm_offset_t uva;
363 u_int len;
364 vm_page_t m;
365
366 uva = (vm_offset_t)uio->uio_offset;
367
368 /*
369 * Get the page number of this segment.
370 */
371 pageno = trunc_page(uva);
372 page_offset = uva - pageno;
373
374 /*
375 * How many bytes to copy
376 */
377 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
378
379 /*
380 * Fault and hold the page on behalf of the process.
381 */
382 error = vm_fault(map, pageno, reqprot, fault_flags, &m);
383 if (error != KERN_SUCCESS) {
384 if (error == KERN_RESOURCE_SHORTAGE)
385 error = ENOMEM;
386 else
387 error = EFAULT;
388 break;
389 }
390
391 /*
392 * Now do the i/o move.
393 */
394 error = uiomove_fromphys(&m, page_offset, len, uio);
395
396 /* Make the I-cache coherent for breakpoints. */
397 if (writing && error == 0) {
398 vm_map_lock_read(map);
399 if (vm_map_check_protection(map, pageno, pageno +
400 PAGE_SIZE, VM_PROT_EXECUTE))
401 vm_sync_icache(map, uva, len);
402 vm_map_unlock_read(map);
403 }
404
405 /*
406 * Release the page.
407 */
408 vm_page_unwire(m, PQ_ACTIVE);
409
410 } while (error == 0 && uio->uio_resid > 0);
411
412 return (error);
413 }
414
415 static ssize_t
proc_iop(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len,enum uio_rw rw)416 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
417 size_t len, enum uio_rw rw)
418 {
419 struct iovec iov;
420 struct uio uio;
421 ssize_t slen;
422
423 MPASS(len < SSIZE_MAX);
424 slen = (ssize_t)len;
425
426 iov.iov_base = (caddr_t)buf;
427 iov.iov_len = len;
428 uio.uio_iov = &iov;
429 uio.uio_iovcnt = 1;
430 uio.uio_offset = va;
431 uio.uio_resid = slen;
432 uio.uio_segflg = UIO_SYSSPACE;
433 uio.uio_rw = rw;
434 uio.uio_td = td;
435 proc_rwmem(p, &uio);
436 if (uio.uio_resid == slen)
437 return (-1);
438 return (slen - uio.uio_resid);
439 }
440
441 ssize_t
proc_readmem(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len)442 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
443 size_t len)
444 {
445
446 return (proc_iop(td, p, va, buf, len, UIO_READ));
447 }
448
449 ssize_t
proc_writemem(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len)450 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
451 size_t len)
452 {
453
454 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
455 }
456
457 static int
ptrace_vm_entry(struct thread * td,struct proc * p,struct ptrace_vm_entry * pve)458 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
459 {
460 struct vattr vattr;
461 vm_map_t map;
462 vm_map_entry_t entry;
463 vm_object_t obj, tobj, lobj;
464 struct vmspace *vm;
465 struct vnode *vp;
466 char *freepath, *fullpath;
467 u_int pathlen;
468 int error, index;
469
470 error = 0;
471 obj = NULL;
472
473 vm = vmspace_acquire_ref(p);
474 map = &vm->vm_map;
475 vm_map_lock_read(map);
476
477 do {
478 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0,
479 ("Submap in map header"));
480 index = 0;
481 VM_MAP_ENTRY_FOREACH(entry, map) {
482 if (index >= pve->pve_entry &&
483 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0)
484 break;
485 index++;
486 }
487 if (index < pve->pve_entry) {
488 error = EINVAL;
489 break;
490 }
491 if (entry == &map->header) {
492 error = ENOENT;
493 break;
494 }
495
496 /* We got an entry. */
497 pve->pve_entry = index + 1;
498 pve->pve_timestamp = map->timestamp;
499 pve->pve_start = entry->start;
500 pve->pve_end = entry->end - 1;
501 pve->pve_offset = entry->offset;
502 pve->pve_prot = entry->protection;
503
504 /* Backing object's path needed? */
505 if (pve->pve_pathlen == 0)
506 break;
507
508 pathlen = pve->pve_pathlen;
509 pve->pve_pathlen = 0;
510
511 obj = entry->object.vm_object;
512 if (obj != NULL)
513 VM_OBJECT_RLOCK(obj);
514 } while (0);
515
516 vm_map_unlock_read(map);
517
518 pve->pve_fsid = VNOVAL;
519 pve->pve_fileid = VNOVAL;
520
521 if (error == 0 && obj != NULL) {
522 lobj = obj;
523 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
524 if (tobj != obj)
525 VM_OBJECT_RLOCK(tobj);
526 if (lobj != obj)
527 VM_OBJECT_RUNLOCK(lobj);
528 lobj = tobj;
529 pve->pve_offset += tobj->backing_object_offset;
530 }
531 vp = vm_object_vnode(lobj);
532 if (vp != NULL)
533 vref(vp);
534 if (lobj != obj)
535 VM_OBJECT_RUNLOCK(lobj);
536 VM_OBJECT_RUNLOCK(obj);
537
538 if (vp != NULL) {
539 freepath = NULL;
540 fullpath = NULL;
541 vn_fullpath(vp, &fullpath, &freepath);
542 vn_lock(vp, LK_SHARED | LK_RETRY);
543 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
544 pve->pve_fileid = vattr.va_fileid;
545 pve->pve_fsid = vattr.va_fsid;
546 }
547 vput(vp);
548
549 if (fullpath != NULL) {
550 pve->pve_pathlen = strlen(fullpath) + 1;
551 if (pve->pve_pathlen <= pathlen) {
552 error = copyout(fullpath, pve->pve_path,
553 pve->pve_pathlen);
554 } else
555 error = ENAMETOOLONG;
556 }
557 if (freepath != NULL)
558 free(freepath, M_TEMP);
559 }
560 }
561 vmspace_free(vm);
562 if (error == 0)
563 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
564 p->p_pid, pve->pve_entry, pve->pve_start);
565
566 return (error);
567 }
568
569 /*
570 * Process debugging system call.
571 */
572 #ifndef _SYS_SYSPROTO_H_
573 struct ptrace_args {
574 int req;
575 pid_t pid;
576 caddr_t addr;
577 int data;
578 };
579 #endif
580
581 int
sys_ptrace(struct thread * td,struct ptrace_args * uap)582 sys_ptrace(struct thread *td, struct ptrace_args *uap)
583 {
584 /*
585 * XXX this obfuscation is to reduce stack usage, but the register
586 * structs may be too large to put on the stack anyway.
587 */
588 union {
589 struct ptrace_io_desc piod;
590 struct ptrace_lwpinfo pl;
591 struct ptrace_vm_entry pve;
592 struct ptrace_coredump pc;
593 struct ptrace_sc_remote sr;
594 struct dbreg dbreg;
595 struct fpreg fpreg;
596 struct reg reg;
597 struct iovec vec;
598 char args[sizeof(td->td_sa.args)];
599 struct ptrace_sc_ret psr;
600 int ptevents;
601 } r;
602 register_t pscr_args[nitems(td->td_sa.args)];
603 void *addr;
604 int error;
605
606 if (!allow_ptrace)
607 return (ENOSYS);
608 error = 0;
609
610 AUDIT_ARG_PID(uap->pid);
611 AUDIT_ARG_CMD(uap->req);
612 AUDIT_ARG_VALUE(uap->data);
613 addr = &r;
614 switch (uap->req) {
615 case PT_GET_EVENT_MASK:
616 case PT_LWPINFO:
617 case PT_GET_SC_ARGS:
618 case PT_GET_SC_RET:
619 break;
620 case PT_GETREGS:
621 bzero(&r.reg, sizeof(r.reg));
622 break;
623 case PT_GETFPREGS:
624 bzero(&r.fpreg, sizeof(r.fpreg));
625 break;
626 case PT_GETDBREGS:
627 bzero(&r.dbreg, sizeof(r.dbreg));
628 break;
629 case PT_GETREGSET:
630 case PT_SETREGSET:
631 error = copyin(uap->addr, &r.vec, sizeof(r.vec));
632 break;
633 case PT_SETREGS:
634 error = copyin(uap->addr, &r.reg, sizeof(r.reg));
635 break;
636 case PT_SETFPREGS:
637 error = copyin(uap->addr, &r.fpreg, sizeof(r.fpreg));
638 break;
639 case PT_SETDBREGS:
640 error = copyin(uap->addr, &r.dbreg, sizeof(r.dbreg));
641 break;
642 case PT_SET_EVENT_MASK:
643 if (uap->data != sizeof(r.ptevents))
644 error = EINVAL;
645 else
646 error = copyin(uap->addr, &r.ptevents, uap->data);
647 break;
648 case PT_IO:
649 error = copyin(uap->addr, &r.piod, sizeof(r.piod));
650 break;
651 case PT_VM_ENTRY:
652 error = copyin(uap->addr, &r.pve, sizeof(r.pve));
653 break;
654 case PT_COREDUMP:
655 if (uap->data != sizeof(r.pc))
656 error = EINVAL;
657 else
658 error = copyin(uap->addr, &r.pc, uap->data);
659 break;
660 case PT_SC_REMOTE:
661 if (uap->data != sizeof(r.sr)) {
662 error = EINVAL;
663 break;
664 }
665 error = copyin(uap->addr, &r.sr, uap->data);
666 if (error != 0)
667 break;
668 if (r.sr.pscr_nargs > nitems(td->td_sa.args)) {
669 error = EINVAL;
670 break;
671 }
672 error = copyin(r.sr.pscr_args, pscr_args,
673 sizeof(u_long) * r.sr.pscr_nargs);
674 if (error != 0)
675 break;
676 r.sr.pscr_args = pscr_args;
677 break;
678 default:
679 addr = uap->addr;
680 break;
681 }
682 if (error)
683 return (error);
684
685 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
686 if (error)
687 return (error);
688
689 switch (uap->req) {
690 case PT_VM_ENTRY:
691 error = copyout(&r.pve, uap->addr, sizeof(r.pve));
692 break;
693 case PT_IO:
694 error = copyout(&r.piod, uap->addr, sizeof(r.piod));
695 break;
696 case PT_GETREGS:
697 error = copyout(&r.reg, uap->addr, sizeof(r.reg));
698 break;
699 case PT_GETFPREGS:
700 error = copyout(&r.fpreg, uap->addr, sizeof(r.fpreg));
701 break;
702 case PT_GETDBREGS:
703 error = copyout(&r.dbreg, uap->addr, sizeof(r.dbreg));
704 break;
705 case PT_GETREGSET:
706 error = copyout(&r.vec, uap->addr, sizeof(r.vec));
707 break;
708 case PT_GET_EVENT_MASK:
709 /* NB: The size in uap->data is validated in kern_ptrace(). */
710 error = copyout(&r.ptevents, uap->addr, uap->data);
711 break;
712 case PT_LWPINFO:
713 /* NB: The size in uap->data is validated in kern_ptrace(). */
714 error = copyout(&r.pl, uap->addr, uap->data);
715 break;
716 case PT_GET_SC_ARGS:
717 error = copyout(r.args, uap->addr, MIN(uap->data,
718 sizeof(r.args)));
719 break;
720 case PT_GET_SC_RET:
721 error = copyout(&r.psr, uap->addr, MIN(uap->data,
722 sizeof(r.psr)));
723 break;
724 case PT_SC_REMOTE:
725 error = copyout(&r.sr.pscr_ret, uap->addr +
726 offsetof(struct ptrace_sc_remote, pscr_ret),
727 sizeof(r.sr.pscr_ret));
728 break;
729 }
730
731 return (error);
732 }
733
734 #ifdef COMPAT_FREEBSD32
735 /*
736 * PROC_READ(regs, td2, addr);
737 * becomes either:
738 * proc_read_regs(td2, addr);
739 * or
740 * proc_read_regs32(td2, addr);
741 * .. except this is done at runtime. There is an additional
742 * complication in that PROC_WRITE disallows 32 bit consumers
743 * from writing to 64 bit address space targets.
744 */
745 #define PROC_READ(w, t, a) wrap32 ? \
746 proc_read_ ## w ## 32(t, a) : \
747 proc_read_ ## w (t, a)
748 #define PROC_WRITE(w, t, a) wrap32 ? \
749 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
750 proc_write_ ## w (t, a)
751 #else
752 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
753 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
754 #endif
755
756 void
proc_set_traced(struct proc * p,bool stop)757 proc_set_traced(struct proc *p, bool stop)
758 {
759
760 sx_assert(&proctree_lock, SX_XLOCKED);
761 PROC_LOCK_ASSERT(p, MA_OWNED);
762 p->p_flag |= P_TRACED;
763 if (stop)
764 p->p_flag2 |= P2_PTRACE_FSTP;
765 p->p_ptevents = PTRACE_DEFAULT;
766 }
767
768 void
ptrace_unsuspend(struct proc * p)769 ptrace_unsuspend(struct proc *p)
770 {
771 PROC_LOCK_ASSERT(p, MA_OWNED);
772
773 PROC_SLOCK(p);
774 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
775 thread_unsuspend(p);
776 PROC_SUNLOCK(p);
777 itimer_proc_continue(p);
778 kqtimer_proc_continue(p);
779 }
780
781 static int
proc_can_ptrace(struct thread * td,struct proc * p)782 proc_can_ptrace(struct thread *td, struct proc *p)
783 {
784 int error;
785
786 PROC_LOCK_ASSERT(p, MA_OWNED);
787
788 if ((p->p_flag & P_WEXIT) != 0)
789 return (ESRCH);
790
791 if ((error = p_cansee(td, p)) != 0)
792 return (error);
793 if ((error = p_candebug(td, p)) != 0)
794 return (error);
795
796 /* not being traced... */
797 if ((p->p_flag & P_TRACED) == 0)
798 return (EPERM);
799
800 /* not being traced by YOU */
801 if (p->p_pptr != td->td_proc)
802 return (EBUSY);
803
804 /* not currently stopped */
805 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
806 p->p_suspcount != p->p_numthreads ||
807 (p->p_flag & P_WAITED) == 0)
808 return (EBUSY);
809
810 return (0);
811 }
812
813 static struct thread *
ptrace_sel_coredump_thread(struct proc * p)814 ptrace_sel_coredump_thread(struct proc *p)
815 {
816 struct thread *td2;
817
818 PROC_LOCK_ASSERT(p, MA_OWNED);
819 MPASS((p->p_flag & P_STOPPED_TRACE) != 0);
820
821 FOREACH_THREAD_IN_PROC(p, td2) {
822 if ((td2->td_dbgflags & TDB_SSWITCH) != 0)
823 return (td2);
824 }
825 return (NULL);
826 }
827
828 int
kern_ptrace(struct thread * td,int req,pid_t pid,void * addr,int data)829 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
830 {
831 struct iovec iov;
832 struct uio uio;
833 struct proc *curp, *p, *pp;
834 struct thread *td2 = NULL, *td3;
835 struct ptrace_io_desc *piod = NULL;
836 struct ptrace_lwpinfo *pl;
837 struct ptrace_sc_ret *psr;
838 struct ptrace_sc_remote *pscr;
839 struct file *fp;
840 struct ptrace_coredump *pc;
841 struct thr_coredump_req *tcq;
842 struct thr_syscall_req *tsr;
843 int error, num, tmp;
844 lwpid_t tid = 0, *buf;
845 #ifdef COMPAT_FREEBSD32
846 int wrap32 = 0, safe = 0;
847 #endif
848 bool proctree_locked, p2_req_set;
849
850 curp = td->td_proc;
851 proctree_locked = false;
852 p2_req_set = false;
853
854 /* Lock proctree before locking the process. */
855 switch (req) {
856 case PT_TRACE_ME:
857 case PT_ATTACH:
858 case PT_STEP:
859 case PT_CONTINUE:
860 case PT_TO_SCE:
861 case PT_TO_SCX:
862 case PT_SYSCALL:
863 case PT_FOLLOW_FORK:
864 case PT_LWP_EVENTS:
865 case PT_GET_EVENT_MASK:
866 case PT_SET_EVENT_MASK:
867 case PT_DETACH:
868 case PT_GET_SC_ARGS:
869 sx_xlock(&proctree_lock);
870 proctree_locked = true;
871 break;
872 default:
873 break;
874 }
875
876 if (req == PT_TRACE_ME) {
877 p = td->td_proc;
878 PROC_LOCK(p);
879 } else {
880 if (pid <= PID_MAX) {
881 if ((p = pfind(pid)) == NULL) {
882 if (proctree_locked)
883 sx_xunlock(&proctree_lock);
884 return (ESRCH);
885 }
886 } else {
887 td2 = tdfind(pid, -1);
888 if (td2 == NULL) {
889 if (proctree_locked)
890 sx_xunlock(&proctree_lock);
891 return (ESRCH);
892 }
893 p = td2->td_proc;
894 tid = pid;
895 pid = p->p_pid;
896 }
897 }
898 AUDIT_ARG_PROCESS(p);
899
900 if ((p->p_flag & P_WEXIT) != 0) {
901 error = ESRCH;
902 goto fail;
903 }
904 if ((error = p_cansee(td, p)) != 0)
905 goto fail;
906
907 if ((error = p_candebug(td, p)) != 0)
908 goto fail;
909
910 /*
911 * System processes can't be debugged.
912 */
913 if ((p->p_flag & P_SYSTEM) != 0) {
914 error = EINVAL;
915 goto fail;
916 }
917
918 if (tid == 0) {
919 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
920 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
921 td2 = p->p_xthread;
922 } else {
923 td2 = FIRST_THREAD_IN_PROC(p);
924 }
925 tid = td2->td_tid;
926 }
927
928 #ifdef COMPAT_FREEBSD32
929 /*
930 * Test if we're a 32 bit client and what the target is.
931 * Set the wrap controls accordingly.
932 */
933 if (SV_CURPROC_FLAG(SV_ILP32)) {
934 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
935 safe = 1;
936 wrap32 = 1;
937 }
938 #endif
939 /*
940 * Permissions check
941 */
942 switch (req) {
943 case PT_TRACE_ME:
944 /*
945 * Always legal, when there is a parent process which
946 * could trace us. Otherwise, reject.
947 */
948 if ((p->p_flag & P_TRACED) != 0) {
949 error = EBUSY;
950 goto fail;
951 }
952 if (p->p_pptr == initproc) {
953 error = EPERM;
954 goto fail;
955 }
956 break;
957
958 case PT_ATTACH:
959 /* Self */
960 if (p == td->td_proc) {
961 error = EINVAL;
962 goto fail;
963 }
964
965 /* Already traced */
966 if (p->p_flag & P_TRACED) {
967 error = EBUSY;
968 goto fail;
969 }
970
971 /* Can't trace an ancestor if you're being traced. */
972 if (curp->p_flag & P_TRACED) {
973 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
974 if (pp == p) {
975 error = EINVAL;
976 goto fail;
977 }
978 }
979 }
980
981 /* OK */
982 break;
983
984 case PT_CLEARSTEP:
985 /* Allow thread to clear single step for itself */
986 if (td->td_tid == tid)
987 break;
988
989 /* FALLTHROUGH */
990 default:
991 /*
992 * Check for ptrace eligibility before waiting for
993 * holds to drain.
994 */
995 error = proc_can_ptrace(td, p);
996 if (error != 0)
997 goto fail;
998
999 /*
1000 * Block parallel ptrace requests. Most important, do
1001 * not allow other thread in debugger to continue the
1002 * debuggee until coredump finished.
1003 */
1004 while ((p->p_flag2 & P2_PTRACEREQ) != 0) {
1005 if (proctree_locked)
1006 sx_xunlock(&proctree_lock);
1007 error = msleep(&p->p_flag2, &p->p_mtx, PPAUSE | PCATCH |
1008 (proctree_locked ? PDROP : 0), "pptrace", 0);
1009 if (proctree_locked) {
1010 sx_xlock(&proctree_lock);
1011 PROC_LOCK(p);
1012 }
1013 if (error == 0 && td2->td_proc != p)
1014 error = ESRCH;
1015 if (error == 0)
1016 error = proc_can_ptrace(td, p);
1017 if (error != 0)
1018 goto fail;
1019 }
1020
1021 /* Ok */
1022 break;
1023 }
1024
1025 /*
1026 * Keep this process around and request parallel ptrace()
1027 * request to wait until we finish this request.
1028 */
1029 MPASS((p->p_flag2 & P2_PTRACEREQ) == 0);
1030 p->p_flag2 |= P2_PTRACEREQ;
1031 p2_req_set = true;
1032 _PHOLD(p);
1033
1034 /*
1035 * Actually do the requests
1036 */
1037
1038 td->td_retval[0] = 0;
1039
1040 switch (req) {
1041 case PT_TRACE_ME:
1042 /* set my trace flag and "owner" so it can read/write me */
1043 proc_set_traced(p, false);
1044 if (p->p_flag & P_PPWAIT)
1045 p->p_flag |= P_PPTRACE;
1046 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
1047 break;
1048
1049 case PT_ATTACH:
1050 /* security check done above */
1051 /*
1052 * It would be nice if the tracing relationship was separate
1053 * from the parent relationship but that would require
1054 * another set of links in the proc struct or for "wait"
1055 * to scan the entire proc table. To make life easier,
1056 * we just re-parent the process we're trying to trace.
1057 * The old parent is remembered so we can put things back
1058 * on a "detach".
1059 */
1060 proc_set_traced(p, true);
1061 proc_reparent(p, td->td_proc, false);
1062 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
1063 p->p_oppid);
1064
1065 sx_xunlock(&proctree_lock);
1066 proctree_locked = false;
1067 MPASS(p->p_xthread == NULL);
1068 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
1069
1070 /*
1071 * If already stopped due to a stop signal, clear the
1072 * existing stop before triggering a traced SIGSTOP.
1073 */
1074 if ((p->p_flag & P_STOPPED_SIG) != 0) {
1075 PROC_SLOCK(p);
1076 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
1077 thread_unsuspend(p);
1078 PROC_SUNLOCK(p);
1079 }
1080
1081 kern_psignal(p, SIGSTOP);
1082 break;
1083
1084 case PT_CLEARSTEP:
1085 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
1086 p->p_pid);
1087 error = ptrace_clear_single_step(td2);
1088 break;
1089
1090 case PT_SETSTEP:
1091 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
1092 p->p_pid);
1093 error = ptrace_single_step(td2);
1094 break;
1095
1096 case PT_SUSPEND:
1097 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
1098 p->p_pid);
1099 td2->td_dbgflags |= TDB_SUSPEND;
1100 thread_lock(td2);
1101 td2->td_flags |= TDF_NEEDSUSPCHK;
1102 thread_unlock(td2);
1103 break;
1104
1105 case PT_RESUME:
1106 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
1107 p->p_pid);
1108 td2->td_dbgflags &= ~TDB_SUSPEND;
1109 break;
1110
1111 case PT_FOLLOW_FORK:
1112 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
1113 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
1114 data ? "enabled" : "disabled");
1115 if (data)
1116 p->p_ptevents |= PTRACE_FORK;
1117 else
1118 p->p_ptevents &= ~PTRACE_FORK;
1119 break;
1120
1121 case PT_LWP_EVENTS:
1122 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
1123 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
1124 data ? "enabled" : "disabled");
1125 if (data)
1126 p->p_ptevents |= PTRACE_LWP;
1127 else
1128 p->p_ptevents &= ~PTRACE_LWP;
1129 break;
1130
1131 case PT_GET_EVENT_MASK:
1132 if (data != sizeof(p->p_ptevents)) {
1133 error = EINVAL;
1134 break;
1135 }
1136 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
1137 p->p_ptevents);
1138 *(int *)addr = p->p_ptevents;
1139 break;
1140
1141 case PT_SET_EVENT_MASK:
1142 if (data != sizeof(p->p_ptevents)) {
1143 error = EINVAL;
1144 break;
1145 }
1146 tmp = *(int *)addr;
1147 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1148 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
1149 error = EINVAL;
1150 break;
1151 }
1152 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1153 p->p_pid, p->p_ptevents, tmp);
1154 p->p_ptevents = tmp;
1155 break;
1156
1157 case PT_GET_SC_ARGS:
1158 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
1159 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
1160 #ifdef COMPAT_FREEBSD32
1161 || (wrap32 && !safe)
1162 #endif
1163 ) {
1164 error = EINVAL;
1165 break;
1166 }
1167 bzero(addr, sizeof(td2->td_sa.args));
1168 /* See the explanation in linux_ptrace_get_syscall_info(). */
1169 bcopy(td2->td_sa.args, addr, SV_PROC_ABI(td->td_proc) ==
1170 SV_ABI_LINUX ? sizeof(td2->td_sa.args) :
1171 td2->td_sa.callp->sy_narg * sizeof(register_t));
1172 break;
1173
1174 case PT_GET_SC_RET:
1175 if ((td2->td_dbgflags & (TDB_SCX)) == 0
1176 #ifdef COMPAT_FREEBSD32
1177 || (wrap32 && !safe)
1178 #endif
1179 ) {
1180 error = EINVAL;
1181 break;
1182 }
1183 psr = addr;
1184 bzero(psr, sizeof(*psr));
1185 psr->sr_error = td2->td_errno;
1186 if (psr->sr_error == 0) {
1187 psr->sr_retval[0] = td2->td_retval[0];
1188 psr->sr_retval[1] = td2->td_retval[1];
1189 }
1190 CTR4(KTR_PTRACE,
1191 "PT_GET_SC_RET: pid %d error %d retval %#lx,%#lx",
1192 p->p_pid, psr->sr_error, psr->sr_retval[0],
1193 psr->sr_retval[1]);
1194 break;
1195
1196 case PT_STEP:
1197 case PT_CONTINUE:
1198 case PT_TO_SCE:
1199 case PT_TO_SCX:
1200 case PT_SYSCALL:
1201 case PT_DETACH:
1202 /* Zero means do not send any signal */
1203 if (data < 0 || data > _SIG_MAXSIG) {
1204 error = EINVAL;
1205 break;
1206 }
1207
1208 switch (req) {
1209 case PT_STEP:
1210 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
1211 td2->td_tid, p->p_pid, data);
1212 error = ptrace_single_step(td2);
1213 if (error)
1214 goto out;
1215 break;
1216 case PT_CONTINUE:
1217 case PT_TO_SCE:
1218 case PT_TO_SCX:
1219 case PT_SYSCALL:
1220 if (addr != (void *)1) {
1221 error = ptrace_set_pc(td2,
1222 (u_long)(uintfptr_t)addr);
1223 if (error)
1224 goto out;
1225 }
1226 switch (req) {
1227 case PT_TO_SCE:
1228 p->p_ptevents |= PTRACE_SCE;
1229 CTR4(KTR_PTRACE,
1230 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1231 p->p_pid, p->p_ptevents,
1232 (u_long)(uintfptr_t)addr, data);
1233 break;
1234 case PT_TO_SCX:
1235 p->p_ptevents |= PTRACE_SCX;
1236 CTR4(KTR_PTRACE,
1237 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1238 p->p_pid, p->p_ptevents,
1239 (u_long)(uintfptr_t)addr, data);
1240 break;
1241 case PT_SYSCALL:
1242 p->p_ptevents |= PTRACE_SYSCALL;
1243 CTR4(KTR_PTRACE,
1244 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1245 p->p_pid, p->p_ptevents,
1246 (u_long)(uintfptr_t)addr, data);
1247 break;
1248 case PT_CONTINUE:
1249 CTR3(KTR_PTRACE,
1250 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1251 p->p_pid, (u_long)(uintfptr_t)addr, data);
1252 break;
1253 }
1254 break;
1255 case PT_DETACH:
1256 /*
1257 * Clear P_TRACED before reparenting
1258 * a detached process back to its original
1259 * parent. Otherwise the debugee will be set
1260 * as an orphan of the debugger.
1261 */
1262 p->p_flag &= ~(P_TRACED | P_WAITED);
1263
1264 /*
1265 * Reset the process parent.
1266 */
1267 if (p->p_oppid != p->p_pptr->p_pid) {
1268 PROC_LOCK(p->p_pptr);
1269 sigqueue_take(p->p_ksi);
1270 PROC_UNLOCK(p->p_pptr);
1271
1272 pp = proc_realparent(p);
1273 proc_reparent(p, pp, false);
1274 if (pp == initproc)
1275 p->p_sigparent = SIGCHLD;
1276 CTR3(KTR_PTRACE,
1277 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1278 p->p_pid, pp->p_pid, data);
1279 } else {
1280 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1281 p->p_pid, data);
1282 }
1283
1284 p->p_ptevents = 0;
1285 FOREACH_THREAD_IN_PROC(p, td3) {
1286 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1287 sigqueue_delete(&td3->td_sigqueue,
1288 SIGSTOP);
1289 }
1290 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
1291 TDB_SUSPEND | TDB_BORN);
1292 }
1293
1294 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1295 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1296 p->p_flag2 &= ~P2_PTRACE_FSTP;
1297 }
1298
1299 /* should we send SIGCHLD? */
1300 /* childproc_continued(p); */
1301 break;
1302 }
1303
1304 sx_xunlock(&proctree_lock);
1305 proctree_locked = false;
1306
1307 sendsig:
1308 MPASS(!proctree_locked);
1309
1310 /*
1311 * Clear the pending event for the thread that just
1312 * reported its event (p_xthread). This may not be
1313 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1314 * the debugger is resuming a different thread.
1315 *
1316 * Deliver any pending signal via the reporting thread.
1317 */
1318 MPASS(p->p_xthread != NULL);
1319 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
1320 p->p_xthread->td_xsig = data;
1321 p->p_xthread = NULL;
1322 p->p_xsig = data;
1323
1324 /*
1325 * P_WKILLED is insurance that a PT_KILL/SIGKILL
1326 * always works immediately, even if another thread is
1327 * unsuspended first and attempts to handle a
1328 * different signal or if the POSIX.1b style signal
1329 * queue cannot accommodate any new signals.
1330 */
1331 if (data == SIGKILL)
1332 proc_wkilled(p);
1333
1334 /*
1335 * Unsuspend all threads. To leave a thread
1336 * suspended, use PT_SUSPEND to suspend it before
1337 * continuing the process.
1338 */
1339 ptrace_unsuspend(p);
1340 break;
1341
1342 case PT_WRITE_I:
1343 case PT_WRITE_D:
1344 td2->td_dbgflags |= TDB_USERWR;
1345 PROC_UNLOCK(p);
1346 error = 0;
1347 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1348 sizeof(int)) != sizeof(int))
1349 error = ENOMEM;
1350 else
1351 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1352 p->p_pid, addr, data);
1353 PROC_LOCK(p);
1354 break;
1355
1356 case PT_READ_I:
1357 case PT_READ_D:
1358 PROC_UNLOCK(p);
1359 error = tmp = 0;
1360 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1361 sizeof(int)) != sizeof(int))
1362 error = ENOMEM;
1363 else
1364 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1365 p->p_pid, addr, tmp);
1366 td->td_retval[0] = tmp;
1367 PROC_LOCK(p);
1368 break;
1369
1370 case PT_IO:
1371 piod = addr;
1372 iov.iov_base = piod->piod_addr;
1373 iov.iov_len = piod->piod_len;
1374 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1375 uio.uio_resid = piod->piod_len;
1376 uio.uio_iov = &iov;
1377 uio.uio_iovcnt = 1;
1378 uio.uio_segflg = UIO_USERSPACE;
1379 uio.uio_td = td;
1380 switch (piod->piod_op) {
1381 case PIOD_READ_D:
1382 case PIOD_READ_I:
1383 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1384 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1385 uio.uio_rw = UIO_READ;
1386 break;
1387 case PIOD_WRITE_D:
1388 case PIOD_WRITE_I:
1389 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1390 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1391 td2->td_dbgflags |= TDB_USERWR;
1392 uio.uio_rw = UIO_WRITE;
1393 break;
1394 default:
1395 error = EINVAL;
1396 goto out;
1397 }
1398 PROC_UNLOCK(p);
1399 error = proc_rwmem(p, &uio);
1400 piod->piod_len -= uio.uio_resid;
1401 PROC_LOCK(p);
1402 break;
1403
1404 case PT_KILL:
1405 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1406 data = SIGKILL;
1407 goto sendsig; /* in PT_CONTINUE above */
1408
1409 case PT_SETREGS:
1410 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1411 p->p_pid);
1412 td2->td_dbgflags |= TDB_USERWR;
1413 error = PROC_WRITE(regs, td2, addr);
1414 break;
1415
1416 case PT_GETREGS:
1417 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1418 p->p_pid);
1419 error = PROC_READ(regs, td2, addr);
1420 break;
1421
1422 case PT_SETFPREGS:
1423 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1424 p->p_pid);
1425 td2->td_dbgflags |= TDB_USERWR;
1426 error = PROC_WRITE(fpregs, td2, addr);
1427 break;
1428
1429 case PT_GETFPREGS:
1430 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1431 p->p_pid);
1432 error = PROC_READ(fpregs, td2, addr);
1433 break;
1434
1435 case PT_SETDBREGS:
1436 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1437 p->p_pid);
1438 td2->td_dbgflags |= TDB_USERWR;
1439 error = PROC_WRITE(dbregs, td2, addr);
1440 break;
1441
1442 case PT_GETDBREGS:
1443 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1444 p->p_pid);
1445 error = PROC_READ(dbregs, td2, addr);
1446 break;
1447
1448 case PT_SETREGSET:
1449 CTR2(KTR_PTRACE, "PT_SETREGSET: tid %d (pid %d)", td2->td_tid,
1450 p->p_pid);
1451 error = proc_write_regset(td2, data, addr);
1452 break;
1453
1454 case PT_GETREGSET:
1455 CTR2(KTR_PTRACE, "PT_GETREGSET: tid %d (pid %d)", td2->td_tid,
1456 p->p_pid);
1457 error = proc_read_regset(td2, data, addr);
1458 break;
1459
1460 case PT_LWPINFO:
1461 if (data <= 0 || data > sizeof(*pl)) {
1462 error = EINVAL;
1463 break;
1464 }
1465 pl = addr;
1466 bzero(pl, sizeof(*pl));
1467 pl->pl_lwpid = td2->td_tid;
1468 pl->pl_event = PL_EVENT_NONE;
1469 pl->pl_flags = 0;
1470 if (td2->td_dbgflags & TDB_XSIG) {
1471 pl->pl_event = PL_EVENT_SIGNAL;
1472 if (td2->td_si.si_signo != 0 &&
1473 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1474 + sizeof(pl->pl_siginfo)){
1475 pl->pl_flags |= PL_FLAG_SI;
1476 pl->pl_siginfo = td2->td_si;
1477 }
1478 }
1479 if (td2->td_dbgflags & TDB_SCE)
1480 pl->pl_flags |= PL_FLAG_SCE;
1481 else if (td2->td_dbgflags & TDB_SCX)
1482 pl->pl_flags |= PL_FLAG_SCX;
1483 if (td2->td_dbgflags & TDB_EXEC)
1484 pl->pl_flags |= PL_FLAG_EXEC;
1485 if (td2->td_dbgflags & TDB_FORK) {
1486 pl->pl_flags |= PL_FLAG_FORKED;
1487 pl->pl_child_pid = td2->td_dbg_forked;
1488 if (td2->td_dbgflags & TDB_VFORK)
1489 pl->pl_flags |= PL_FLAG_VFORKED;
1490 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1491 TDB_VFORK)
1492 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1493 if (td2->td_dbgflags & TDB_CHILD)
1494 pl->pl_flags |= PL_FLAG_CHILD;
1495 if (td2->td_dbgflags & TDB_BORN)
1496 pl->pl_flags |= PL_FLAG_BORN;
1497 if (td2->td_dbgflags & TDB_EXIT)
1498 pl->pl_flags |= PL_FLAG_EXITED;
1499 pl->pl_sigmask = td2->td_sigmask;
1500 pl->pl_siglist = td2->td_siglist;
1501 strcpy(pl->pl_tdname, td2->td_name);
1502 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1503 pl->pl_syscall_code = td2->td_sa.code;
1504 pl->pl_syscall_narg = td2->td_sa.callp->sy_narg;
1505 } else {
1506 pl->pl_syscall_code = 0;
1507 pl->pl_syscall_narg = 0;
1508 }
1509 CTR6(KTR_PTRACE,
1510 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1511 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1512 pl->pl_child_pid, pl->pl_syscall_code);
1513 break;
1514
1515 case PT_GETNUMLWPS:
1516 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1517 p->p_numthreads);
1518 td->td_retval[0] = p->p_numthreads;
1519 break;
1520
1521 case PT_GETLWPLIST:
1522 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1523 p->p_pid, data, p->p_numthreads);
1524 if (data <= 0) {
1525 error = EINVAL;
1526 break;
1527 }
1528 num = imin(p->p_numthreads, data);
1529 PROC_UNLOCK(p);
1530 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1531 tmp = 0;
1532 PROC_LOCK(p);
1533 FOREACH_THREAD_IN_PROC(p, td2) {
1534 if (tmp >= num)
1535 break;
1536 buf[tmp++] = td2->td_tid;
1537 }
1538 PROC_UNLOCK(p);
1539 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1540 free(buf, M_TEMP);
1541 if (!error)
1542 td->td_retval[0] = tmp;
1543 PROC_LOCK(p);
1544 break;
1545
1546 case PT_VM_TIMESTAMP:
1547 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1548 p->p_pid, p->p_vmspace->vm_map.timestamp);
1549 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1550 break;
1551
1552 case PT_VM_ENTRY:
1553 PROC_UNLOCK(p);
1554 error = ptrace_vm_entry(td, p, addr);
1555 PROC_LOCK(p);
1556 break;
1557
1558 case PT_COREDUMP:
1559 pc = addr;
1560 CTR2(KTR_PTRACE, "PT_COREDUMP: pid %d, fd %d",
1561 p->p_pid, pc->pc_fd);
1562
1563 if ((pc->pc_flags & ~(PC_COMPRESS | PC_ALL)) != 0) {
1564 error = EINVAL;
1565 break;
1566 }
1567 PROC_UNLOCK(p);
1568
1569 tcq = malloc(sizeof(*tcq), M_TEMP, M_WAITOK | M_ZERO);
1570 fp = NULL;
1571 error = fget_write(td, pc->pc_fd, &cap_write_rights, &fp);
1572 if (error != 0)
1573 goto coredump_cleanup_nofp;
1574 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VREG) {
1575 error = EPIPE;
1576 goto coredump_cleanup;
1577 }
1578
1579 PROC_LOCK(p);
1580 error = proc_can_ptrace(td, p);
1581 if (error != 0)
1582 goto coredump_cleanup_locked;
1583
1584 td2 = ptrace_sel_coredump_thread(p);
1585 if (td2 == NULL) {
1586 error = EBUSY;
1587 goto coredump_cleanup_locked;
1588 }
1589 KASSERT((td2->td_dbgflags & (TDB_COREDUMPREQ |
1590 TDB_SCREMOTEREQ)) == 0,
1591 ("proc %d tid %d req coredump", p->p_pid, td2->td_tid));
1592
1593 tcq->tc_vp = fp->f_vnode;
1594 tcq->tc_limit = pc->pc_limit == 0 ? OFF_MAX : pc->pc_limit;
1595 tcq->tc_flags = SVC_PT_COREDUMP;
1596 if ((pc->pc_flags & PC_COMPRESS) == 0)
1597 tcq->tc_flags |= SVC_NOCOMPRESS;
1598 if ((pc->pc_flags & PC_ALL) != 0)
1599 tcq->tc_flags |= SVC_ALL;
1600 td2->td_remotereq = tcq;
1601 td2->td_dbgflags |= TDB_COREDUMPREQ;
1602 thread_run_flash(td2);
1603 while ((td2->td_dbgflags & TDB_COREDUMPREQ) != 0)
1604 msleep(p, &p->p_mtx, PPAUSE, "crdmp", 0);
1605 error = tcq->tc_error;
1606 coredump_cleanup_locked:
1607 PROC_UNLOCK(p);
1608 coredump_cleanup:
1609 fdrop(fp, td);
1610 coredump_cleanup_nofp:
1611 free(tcq, M_TEMP);
1612 PROC_LOCK(p);
1613 break;
1614
1615 case PT_SC_REMOTE:
1616 pscr = addr;
1617 CTR2(KTR_PTRACE, "PT_SC_REMOTE: pid %d, syscall %d",
1618 p->p_pid, pscr->pscr_syscall);
1619 if ((td2->td_dbgflags & TDB_BOUNDARY) == 0) {
1620 error = EBUSY;
1621 break;
1622 }
1623 PROC_UNLOCK(p);
1624 MPASS(pscr->pscr_nargs <= nitems(td->td_sa.args));
1625
1626 tsr = malloc(sizeof(struct thr_syscall_req), M_TEMP,
1627 M_WAITOK | M_ZERO);
1628
1629 tsr->ts_sa.code = pscr->pscr_syscall;
1630 tsr->ts_nargs = pscr->pscr_nargs;
1631 memcpy(&tsr->ts_sa.args, pscr->pscr_args,
1632 sizeof(register_t) * tsr->ts_nargs);
1633
1634 PROC_LOCK(p);
1635 error = proc_can_ptrace(td, p);
1636 if (error != 0) {
1637 free(tsr, M_TEMP);
1638 break;
1639 }
1640 if (td2->td_proc != p) {
1641 free(tsr, M_TEMP);
1642 error = ESRCH;
1643 break;
1644 }
1645 KASSERT((td2->td_dbgflags & (TDB_COREDUMPREQ |
1646 TDB_SCREMOTEREQ)) == 0,
1647 ("proc %d tid %d req coredump", p->p_pid, td2->td_tid));
1648
1649 td2->td_remotereq = tsr;
1650 td2->td_dbgflags |= TDB_SCREMOTEREQ;
1651 thread_run_flash(td2);
1652 while ((td2->td_dbgflags & TDB_SCREMOTEREQ) != 0)
1653 msleep(p, &p->p_mtx, PPAUSE, "pscrx", 0);
1654 error = 0;
1655 memcpy(&pscr->pscr_ret, &tsr->ts_ret, sizeof(tsr->ts_ret));
1656 free(tsr, M_TEMP);
1657 break;
1658
1659 default:
1660 #ifdef __HAVE_PTRACE_MACHDEP
1661 if (req >= PT_FIRSTMACH) {
1662 PROC_UNLOCK(p);
1663 error = cpu_ptrace(td2, req, addr, data);
1664 PROC_LOCK(p);
1665 } else
1666 #endif
1667 /* Unknown request. */
1668 error = EINVAL;
1669 break;
1670 }
1671 out:
1672 /* Drop our hold on this process now that the request has completed. */
1673 _PRELE(p);
1674 fail:
1675 if (p2_req_set) {
1676 if ((p->p_flag2 & P2_PTRACEREQ) != 0)
1677 wakeup(&p->p_flag2);
1678 p->p_flag2 &= ~P2_PTRACEREQ;
1679 }
1680 PROC_UNLOCK(p);
1681 if (proctree_locked)
1682 sx_xunlock(&proctree_lock);
1683 return (error);
1684 }
1685 #undef PROC_READ
1686 #undef PROC_WRITE
1687