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: stable/12/sys/kern/sys_process.c 369690 2021-05-01 00:40:56Z kib $");
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
proc_read_regs(struct thread * td,struct reg * regs)136 proc_read_regs(struct thread *td, struct reg *regs)
137 {
138
139 PROC_ACTION(fill_regs(td, regs));
140 }
141
142 int
proc_write_regs(struct thread * td,struct reg * regs)143 proc_write_regs(struct thread *td, struct reg *regs)
144 {
145
146 PROC_ACTION(set_regs(td, regs));
147 }
148
149 int
proc_read_dbregs(struct thread * td,struct dbreg * dbregs)150 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
151 {
152
153 PROC_ACTION(fill_dbregs(td, dbregs));
154 }
155
156 int
proc_write_dbregs(struct thread * td,struct dbreg * dbregs)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
proc_read_fpregs(struct thread * td,struct fpreg * fpregs)168 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
169 {
170
171 PROC_ACTION(fill_fpregs(td, fpregs));
172 }
173
174 int
proc_write_fpregs(struct thread * td,struct fpreg * fpregs)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
proc_read_regs32(struct thread * td,struct reg32 * regs32)184 proc_read_regs32(struct thread *td, struct reg32 *regs32)
185 {
186
187 PROC_ACTION(fill_regs32(td, regs32));
188 }
189
190 int
proc_write_regs32(struct thread * td,struct reg32 * regs32)191 proc_write_regs32(struct thread *td, struct reg32 *regs32)
192 {
193
194 PROC_ACTION(set_regs32(td, regs32));
195 }
196
197 int
proc_read_dbregs32(struct thread * td,struct dbreg32 * dbregs32)198 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
199 {
200
201 PROC_ACTION(fill_dbregs32(td, dbregs32));
202 }
203
204 int
proc_write_dbregs32(struct thread * td,struct dbreg32 * dbregs32)205 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
206 {
207
208 PROC_ACTION(set_dbregs32(td, dbregs32));
209 }
210
211 int
proc_read_fpregs32(struct thread * td,struct fpreg32 * fpregs32)212 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
213 {
214
215 PROC_ACTION(fill_fpregs32(td, fpregs32));
216 }
217
218 int
proc_write_fpregs32(struct thread * td,struct fpreg32 * fpregs32)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
proc_sstep(struct thread * td)227 proc_sstep(struct thread *td)
228 {
229
230 PROC_ACTION(ptrace_single_step(td));
231 }
232
233 int
proc_rwmem(struct proc * p,struct uio * uio)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
proc_iop(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len,enum uio_rw rw)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
proc_readmem(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len)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
proc_writemem(struct thread * td,struct proc * p,vm_offset_t va,void * buf,size_t len)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
ptrace_vm_entry(struct thread * td,struct proc * p,struct ptrace_vm_entry * pve)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
ptrace_vm_entry32(struct thread * td,struct proc * p,struct ptrace_vm_entry32 * pve32)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
ptrace_lwpinfo_to32(const struct ptrace_lwpinfo * pl,struct ptrace_lwpinfo32 * pl32)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
ptrace_sc_ret_to32(const struct ptrace_sc_ret * psr,struct ptrace_sc_ret32 * psr32)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
sys_ptrace(struct thread * td,struct ptrace_args * uap)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
proc_set_traced(struct proc * p,bool stop)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
kern_ptrace(struct thread * td,int req,pid_t pid,void * addr,int data)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 }
1552