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