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: stable/10/sys/kern/sys_process.c 328379 2018-01-24 21:48:39Z jhb $");
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/priv.h>
45 #include <sys/proc.h>
46 #include <sys/vnode.h>
47 #include <sys/ptrace.h>
48 #include <sys/rwlock.h>
49 #include <sys/sx.h>
50 #include <sys/malloc.h>
51 #include <sys/signalvar.h>
52
53 #include <machine/reg.h>
54
55 #include <security/audit/audit.h>
56
57 #include <vm/vm.h>
58 #include <vm/pmap.h>
59 #include <vm/vm_extern.h>
60 #include <vm/vm_map.h>
61 #include <vm/vm_kern.h>
62 #include <vm/vm_object.h>
63 #include <vm/vm_page.h>
64 #include <vm/vm_param.h>
65
66 #ifdef COMPAT_FREEBSD32
67 #include <sys/procfs.h>
68 #include <compat/freebsd32/freebsd32_signal.h>
69
70 struct ptrace_io_desc32 {
71 int piod_op;
72 uint32_t piod_offs;
73 uint32_t piod_addr;
74 uint32_t piod_len;
75 };
76
77 struct ptrace_vm_entry32 {
78 int pve_entry;
79 int pve_timestamp;
80 uint32_t pve_start;
81 uint32_t pve_end;
82 uint32_t pve_offset;
83 u_int pve_prot;
84 u_int pve_pathlen;
85 int32_t pve_fileid;
86 u_int pve_fsid;
87 uint32_t pve_path;
88 };
89
90 struct ptrace_lwpinfo32 {
91 lwpid_t pl_lwpid; /* LWP described. */
92 int pl_event; /* Event that stopped the LWP. */
93 int pl_flags; /* LWP flags. */
94 sigset_t pl_sigmask; /* LWP signal mask */
95 sigset_t pl_siglist; /* LWP pending signal */
96 struct siginfo32 pl_siginfo; /* siginfo for signal */
97 char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */
98 pid_t pl_child_pid; /* New child pid */
99 u_int pl_syscall_code;
100 u_int pl_syscall_narg;
101 };
102
103 #endif
104
105 /*
106 * Functions implemented using PROC_ACTION():
107 *
108 * proc_read_regs(proc, regs)
109 * Get the current user-visible register set from the process
110 * and copy it into the regs structure (<machine/reg.h>).
111 * The process is stopped at the time read_regs is called.
112 *
113 * proc_write_regs(proc, regs)
114 * Update the current register set from the passed in regs
115 * structure. Take care to avoid clobbering special CPU
116 * registers or privileged bits in the PSL.
117 * Depending on the architecture this may have fix-up work to do,
118 * especially if the IAR or PCW are modified.
119 * The process is stopped at the time write_regs is called.
120 *
121 * proc_read_fpregs, proc_write_fpregs
122 * deal with the floating point register set, otherwise as above.
123 *
124 * proc_read_dbregs, proc_write_dbregs
125 * deal with the processor debug register set, otherwise as above.
126 *
127 * proc_sstep(proc)
128 * Arrange for the process to trap after executing a single instruction.
129 */
130
131 #define PROC_ACTION(action) do { \
132 int error; \
133 \
134 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
135 if ((td->td_proc->p_flag & P_INMEM) == 0) \
136 error = EIO; \
137 else \
138 error = (action); \
139 return (error); \
140 } while(0)
141
142 int
proc_read_regs(struct thread * td,struct reg * regs)143 proc_read_regs(struct thread *td, struct reg *regs)
144 {
145
146 PROC_ACTION(fill_regs(td, regs));
147 }
148
149 int
proc_write_regs(struct thread * td,struct reg * regs)150 proc_write_regs(struct thread *td, struct reg *regs)
151 {
152
153 PROC_ACTION(set_regs(td, regs));
154 }
155
156 int
proc_read_dbregs(struct thread * td,struct dbreg * dbregs)157 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
158 {
159
160 PROC_ACTION(fill_dbregs(td, dbregs));
161 }
162
163 int
proc_write_dbregs(struct thread * td,struct dbreg * dbregs)164 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
165 {
166
167 PROC_ACTION(set_dbregs(td, dbregs));
168 }
169
170 /*
171 * Ptrace doesn't support fpregs at all, and there are no security holes
172 * or translations for fpregs, so we can just copy them.
173 */
174 int
proc_read_fpregs(struct thread * td,struct fpreg * fpregs)175 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
176 {
177
178 PROC_ACTION(fill_fpregs(td, fpregs));
179 }
180
181 int
proc_write_fpregs(struct thread * td,struct fpreg * fpregs)182 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
183 {
184
185 PROC_ACTION(set_fpregs(td, fpregs));
186 }
187
188 #ifdef COMPAT_FREEBSD32
189 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
190 int
proc_read_regs32(struct thread * td,struct reg32 * regs32)191 proc_read_regs32(struct thread *td, struct reg32 *regs32)
192 {
193
194 PROC_ACTION(fill_regs32(td, regs32));
195 }
196
197 int
proc_write_regs32(struct thread * td,struct reg32 * regs32)198 proc_write_regs32(struct thread *td, struct reg32 *regs32)
199 {
200
201 PROC_ACTION(set_regs32(td, regs32));
202 }
203
204 int
proc_read_dbregs32(struct thread * td,struct dbreg32 * dbregs32)205 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
206 {
207
208 PROC_ACTION(fill_dbregs32(td, dbregs32));
209 }
210
211 int
proc_write_dbregs32(struct thread * td,struct dbreg32 * dbregs32)212 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
213 {
214
215 PROC_ACTION(set_dbregs32(td, dbregs32));
216 }
217
218 int
proc_read_fpregs32(struct thread * td,struct fpreg32 * fpregs32)219 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
220 {
221
222 PROC_ACTION(fill_fpregs32(td, fpregs32));
223 }
224
225 int
proc_write_fpregs32(struct thread * td,struct fpreg32 * fpregs32)226 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
227 {
228
229 PROC_ACTION(set_fpregs32(td, fpregs32));
230 }
231 #endif
232
233 int
proc_sstep(struct thread * td)234 proc_sstep(struct thread *td)
235 {
236
237 PROC_ACTION(ptrace_single_step(td));
238 }
239
240 int
proc_rwmem(struct proc * p,struct uio * uio)241 proc_rwmem(struct proc *p, struct uio *uio)
242 {
243 vm_map_t map;
244 vm_offset_t pageno; /* page number */
245 vm_prot_t reqprot;
246 int error, fault_flags, page_offset, writing;
247
248 /*
249 * Assert that someone has locked this vmspace. (Should be
250 * curthread but we can't assert that.) This keeps the process
251 * from exiting out from under us until this operation completes.
252 */
253 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
254 p, p->p_pid));
255
256 /*
257 * The map we want...
258 */
259 map = &p->p_vmspace->vm_map;
260
261 /*
262 * If we are writing, then we request vm_fault() to create a private
263 * copy of each page. Since these copies will not be writeable by the
264 * process, we must explicity request that they be dirtied.
265 */
266 writing = uio->uio_rw == UIO_WRITE;
267 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
268 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
269
270 /*
271 * Only map in one page at a time. We don't have to, but it
272 * makes things easier. This way is trivial - right?
273 */
274 do {
275 vm_offset_t uva;
276 u_int len;
277 vm_page_t m;
278
279 uva = (vm_offset_t)uio->uio_offset;
280
281 /*
282 * Get the page number of this segment.
283 */
284 pageno = trunc_page(uva);
285 page_offset = uva - pageno;
286
287 /*
288 * How many bytes to copy
289 */
290 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
291
292 /*
293 * Fault and hold the page on behalf of the process.
294 */
295 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
296 if (error != KERN_SUCCESS) {
297 if (error == KERN_RESOURCE_SHORTAGE)
298 error = ENOMEM;
299 else
300 error = EFAULT;
301 break;
302 }
303
304 /*
305 * Now do the i/o move.
306 */
307 error = uiomove_fromphys(&m, page_offset, len, uio);
308
309 /* Make the I-cache coherent for breakpoints. */
310 if (writing && error == 0) {
311 vm_map_lock_read(map);
312 if (vm_map_check_protection(map, pageno, pageno +
313 PAGE_SIZE, VM_PROT_EXECUTE))
314 vm_sync_icache(map, uva, len);
315 vm_map_unlock_read(map);
316 }
317
318 /*
319 * Release the page.
320 */
321 vm_page_lock(m);
322 vm_page_unhold(m);
323 vm_page_unlock(m);
324
325 } while (error == 0 && uio->uio_resid > 0);
326
327 return (error);
328 }
329
330 static int
ptrace_vm_entry(struct thread * td,struct proc * p,struct ptrace_vm_entry * pve)331 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
332 {
333 struct vattr vattr;
334 vm_map_t map;
335 vm_map_entry_t entry;
336 vm_object_t obj, tobj, lobj;
337 struct vmspace *vm;
338 struct vnode *vp;
339 char *freepath, *fullpath;
340 u_int pathlen;
341 int error, index;
342
343 error = 0;
344 obj = NULL;
345
346 vm = vmspace_acquire_ref(p);
347 map = &vm->vm_map;
348 vm_map_lock_read(map);
349
350 do {
351 entry = map->header.next;
352 index = 0;
353 while (index < pve->pve_entry && entry != &map->header) {
354 entry = entry->next;
355 index++;
356 }
357 if (index != pve->pve_entry) {
358 error = EINVAL;
359 break;
360 }
361 while (entry != &map->header &&
362 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
363 entry = entry->next;
364 index++;
365 }
366 if (entry == &map->header) {
367 error = ENOENT;
368 break;
369 }
370
371 /* We got an entry. */
372 pve->pve_entry = index + 1;
373 pve->pve_timestamp = map->timestamp;
374 pve->pve_start = entry->start;
375 pve->pve_end = entry->end - 1;
376 pve->pve_offset = entry->offset;
377 pve->pve_prot = entry->protection;
378
379 /* Backing object's path needed? */
380 if (pve->pve_pathlen == 0)
381 break;
382
383 pathlen = pve->pve_pathlen;
384 pve->pve_pathlen = 0;
385
386 obj = entry->object.vm_object;
387 if (obj != NULL)
388 VM_OBJECT_RLOCK(obj);
389 } while (0);
390
391 vm_map_unlock_read(map);
392
393 pve->pve_fsid = VNOVAL;
394 pve->pve_fileid = VNOVAL;
395
396 if (error == 0 && obj != NULL) {
397 lobj = obj;
398 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
399 if (tobj != obj)
400 VM_OBJECT_RLOCK(tobj);
401 if (lobj != obj)
402 VM_OBJECT_RUNLOCK(lobj);
403 lobj = tobj;
404 pve->pve_offset += tobj->backing_object_offset;
405 }
406 vp = vm_object_vnode(lobj);
407 if (vp != NULL)
408 vref(vp);
409 if (lobj != obj)
410 VM_OBJECT_RUNLOCK(lobj);
411 VM_OBJECT_RUNLOCK(obj);
412
413 if (vp != NULL) {
414 freepath = NULL;
415 fullpath = NULL;
416 vn_fullpath(td, vp, &fullpath, &freepath);
417 vn_lock(vp, LK_SHARED | LK_RETRY);
418 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
419 pve->pve_fileid = vattr.va_fileid;
420 pve->pve_fsid = vattr.va_fsid;
421 }
422 vput(vp);
423
424 if (fullpath != NULL) {
425 pve->pve_pathlen = strlen(fullpath) + 1;
426 if (pve->pve_pathlen <= pathlen) {
427 error = copyout(fullpath, pve->pve_path,
428 pve->pve_pathlen);
429 } else
430 error = ENAMETOOLONG;
431 }
432 if (freepath != NULL)
433 free(freepath, M_TEMP);
434 }
435 }
436 vmspace_free(vm);
437 if (error == 0)
438 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
439 p->p_pid, pve->pve_entry, pve->pve_start);
440
441 return (error);
442 }
443
444 #ifdef COMPAT_FREEBSD32
445 static int
ptrace_vm_entry32(struct thread * td,struct proc * p,struct ptrace_vm_entry32 * pve32)446 ptrace_vm_entry32(struct thread *td, struct proc *p,
447 struct ptrace_vm_entry32 *pve32)
448 {
449 struct ptrace_vm_entry pve;
450 int error;
451
452 pve.pve_entry = pve32->pve_entry;
453 pve.pve_pathlen = pve32->pve_pathlen;
454 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
455
456 error = ptrace_vm_entry(td, p, &pve);
457 if (error == 0) {
458 pve32->pve_entry = pve.pve_entry;
459 pve32->pve_timestamp = pve.pve_timestamp;
460 pve32->pve_start = pve.pve_start;
461 pve32->pve_end = pve.pve_end;
462 pve32->pve_offset = pve.pve_offset;
463 pve32->pve_prot = pve.pve_prot;
464 pve32->pve_fileid = pve.pve_fileid;
465 pve32->pve_fsid = pve.pve_fsid;
466 }
467
468 pve32->pve_pathlen = pve.pve_pathlen;
469 return (error);
470 }
471
472 static void
ptrace_lwpinfo_to32(const struct ptrace_lwpinfo * pl,struct ptrace_lwpinfo32 * pl32)473 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
474 struct ptrace_lwpinfo32 *pl32)
475 {
476
477 bzero(pl32, sizeof(*pl32));
478 pl32->pl_lwpid = pl->pl_lwpid;
479 pl32->pl_event = pl->pl_event;
480 pl32->pl_flags = pl->pl_flags;
481 pl32->pl_sigmask = pl->pl_sigmask;
482 pl32->pl_siglist = pl->pl_siglist;
483 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
484 strcpy(pl32->pl_tdname, pl->pl_tdname);
485 pl32->pl_child_pid = pl->pl_child_pid;
486 pl32->pl_syscall_code = pl->pl_syscall_code;
487 pl32->pl_syscall_narg = pl->pl_syscall_narg;
488 }
489 #endif /* COMPAT_FREEBSD32 */
490
491 /*
492 * Process debugging system call.
493 */
494 #ifndef _SYS_SYSPROTO_H_
495 struct ptrace_args {
496 int req;
497 pid_t pid;
498 caddr_t addr;
499 int data;
500 };
501 #endif
502
503 #ifdef COMPAT_FREEBSD32
504 /*
505 * This CPP subterfuge is to try and reduce the number of ifdefs in
506 * the body of the code.
507 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
508 * becomes either:
509 * copyin(uap->addr, &r.reg, sizeof r.reg);
510 * or
511 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
512 * .. except this is done at runtime.
513 */
514 #define COPYIN(u, k, s) wrap32 ? \
515 copyin(u, k ## 32, s ## 32) : \
516 copyin(u, k, s)
517 #define COPYOUT(k, u, s) wrap32 ? \
518 copyout(k ## 32, u, s ## 32) : \
519 copyout(k, u, s)
520 #else
521 #define COPYIN(u, k, s) copyin(u, k, s)
522 #define COPYOUT(k, u, s) copyout(k, u, s)
523 #endif
524 int
sys_ptrace(struct thread * td,struct ptrace_args * uap)525 sys_ptrace(struct thread *td, struct ptrace_args *uap)
526 {
527 /*
528 * XXX this obfuscation is to reduce stack usage, but the register
529 * structs may be too large to put on the stack anyway.
530 */
531 union {
532 struct ptrace_io_desc piod;
533 struct ptrace_lwpinfo pl;
534 struct ptrace_vm_entry pve;
535 struct dbreg dbreg;
536 struct fpreg fpreg;
537 struct reg reg;
538 #ifdef COMPAT_FREEBSD32
539 struct dbreg32 dbreg32;
540 struct fpreg32 fpreg32;
541 struct reg32 reg32;
542 struct ptrace_io_desc32 piod32;
543 struct ptrace_lwpinfo32 pl32;
544 struct ptrace_vm_entry32 pve32;
545 #endif
546 int ptevents;
547 } r;
548 void *addr;
549 int error = 0;
550 #ifdef COMPAT_FREEBSD32
551 int wrap32 = 0;
552
553 if (SV_CURPROC_FLAG(SV_ILP32))
554 wrap32 = 1;
555 #endif
556 AUDIT_ARG_PID(uap->pid);
557 AUDIT_ARG_CMD(uap->req);
558 AUDIT_ARG_VALUE(uap->data);
559 addr = &r;
560 switch (uap->req) {
561 case PT_GET_EVENT_MASK:
562 case PT_GETREGS:
563 case PT_GETFPREGS:
564 case PT_GETDBREGS:
565 case PT_LWPINFO:
566 break;
567 case PT_SETREGS:
568 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
569 break;
570 case PT_SETFPREGS:
571 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
572 break;
573 case PT_SETDBREGS:
574 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
575 break;
576 case PT_SET_EVENT_MASK:
577 if (uap->data != sizeof(r.ptevents))
578 error = EINVAL;
579 else
580 error = copyin(uap->addr, &r.ptevents, uap->data);
581 break;
582 case PT_IO:
583 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
584 break;
585 case PT_VM_ENTRY:
586 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
587 break;
588 default:
589 addr = uap->addr;
590 break;
591 }
592 if (error)
593 return (error);
594
595 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
596 if (error)
597 return (error);
598
599 switch (uap->req) {
600 case PT_VM_ENTRY:
601 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
602 break;
603 case PT_IO:
604 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
605 break;
606 case PT_GETREGS:
607 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
608 break;
609 case PT_GETFPREGS:
610 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
611 break;
612 case PT_GETDBREGS:
613 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
614 break;
615 case PT_GET_EVENT_MASK:
616 /* NB: The size in uap->data is validated in kern_ptrace(). */
617 error = copyout(&r.ptevents, uap->addr, uap->data);
618 break;
619 case PT_LWPINFO:
620 /* NB: The size in uap->data is validated in kern_ptrace(). */
621 error = copyout(&r.pl, uap->addr, uap->data);
622 break;
623 }
624
625 return (error);
626 }
627 #undef COPYIN
628 #undef COPYOUT
629
630 #ifdef COMPAT_FREEBSD32
631 /*
632 * PROC_READ(regs, td2, addr);
633 * becomes either:
634 * proc_read_regs(td2, addr);
635 * or
636 * proc_read_regs32(td2, addr);
637 * .. except this is done at runtime. There is an additional
638 * complication in that PROC_WRITE disallows 32 bit consumers
639 * from writing to 64 bit address space targets.
640 */
641 #define PROC_READ(w, t, a) wrap32 ? \
642 proc_read_ ## w ## 32(t, a) : \
643 proc_read_ ## w (t, a)
644 #define PROC_WRITE(w, t, a) wrap32 ? \
645 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
646 proc_write_ ## w (t, a)
647 #else
648 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
649 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
650 #endif
651
652 void
proc_set_traced(struct proc * p,bool stop)653 proc_set_traced(struct proc *p, bool stop)
654 {
655
656 PROC_LOCK_ASSERT(p, MA_OWNED);
657 p->p_flag |= P_TRACED;
658 if (stop)
659 p->p_flag2 |= P2_PTRACE_FSTP;
660 p->p_ptevents = PTRACE_DEFAULT;
661 p->p_oppid = p->p_pptr->p_pid;
662 }
663
664 int
kern_ptrace(struct thread * td,int req,pid_t pid,void * addr,int data)665 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
666 {
667 struct iovec iov;
668 struct uio uio;
669 struct proc *curp, *p, *pp;
670 struct thread *td2 = NULL, *td3;
671 struct ptrace_io_desc *piod = NULL;
672 struct ptrace_lwpinfo *pl;
673 int error, write, tmp, num;
674 int proctree_locked = 0;
675 lwpid_t tid = 0, *buf;
676 #ifdef COMPAT_FREEBSD32
677 int wrap32 = 0, safe = 0;
678 struct ptrace_io_desc32 *piod32 = NULL;
679 struct ptrace_lwpinfo32 *pl32 = NULL;
680 struct ptrace_lwpinfo plr;
681 #endif
682
683 curp = td->td_proc;
684
685 /* Lock proctree before locking the process. */
686 switch (req) {
687 case PT_TRACE_ME:
688 case PT_ATTACH:
689 case PT_STEP:
690 case PT_CONTINUE:
691 case PT_TO_SCE:
692 case PT_TO_SCX:
693 case PT_SYSCALL:
694 case PT_FOLLOW_FORK:
695 case PT_LWP_EVENTS:
696 case PT_GET_EVENT_MASK:
697 case PT_SET_EVENT_MASK:
698 case PT_DETACH:
699 sx_xlock(&proctree_lock);
700 proctree_locked = 1;
701 break;
702 default:
703 break;
704 }
705
706 write = 0;
707 if (req == PT_TRACE_ME) {
708 p = td->td_proc;
709 PROC_LOCK(p);
710 } else {
711 if (pid <= PID_MAX) {
712 if ((p = pfind(pid)) == NULL) {
713 if (proctree_locked)
714 sx_xunlock(&proctree_lock);
715 return (ESRCH);
716 }
717 } else {
718 td2 = tdfind(pid, -1);
719 if (td2 == NULL) {
720 if (proctree_locked)
721 sx_xunlock(&proctree_lock);
722 return (ESRCH);
723 }
724 p = td2->td_proc;
725 tid = pid;
726 pid = p->p_pid;
727 }
728 }
729 AUDIT_ARG_PROCESS(p);
730
731 if ((p->p_flag & P_WEXIT) != 0) {
732 error = ESRCH;
733 goto fail;
734 }
735 if ((error = p_cansee(td, p)) != 0)
736 goto fail;
737
738 if ((error = p_candebug(td, p)) != 0)
739 goto fail;
740
741 /*
742 * System processes can't be debugged.
743 */
744 if ((p->p_flag & P_SYSTEM) != 0) {
745 error = EINVAL;
746 goto fail;
747 }
748
749 if (tid == 0) {
750 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
751 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
752 td2 = p->p_xthread;
753 } else {
754 td2 = FIRST_THREAD_IN_PROC(p);
755 }
756 tid = td2->td_tid;
757 }
758
759 #ifdef COMPAT_FREEBSD32
760 /*
761 * Test if we're a 32 bit client and what the target is.
762 * Set the wrap controls accordingly.
763 */
764 if (SV_CURPROC_FLAG(SV_ILP32)) {
765 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
766 safe = 1;
767 wrap32 = 1;
768 }
769 #endif
770 /*
771 * Permissions check
772 */
773 switch (req) {
774 case PT_TRACE_ME:
775 /*
776 * Always legal, when there is a parent process which
777 * could trace us. Otherwise, reject.
778 */
779 if ((p->p_flag & P_TRACED) != 0) {
780 error = EBUSY;
781 goto fail;
782 }
783 if (p->p_pptr == initproc) {
784 error = EPERM;
785 goto fail;
786 }
787 break;
788
789 case PT_ATTACH:
790 /* Self */
791 if (p == td->td_proc) {
792 error = EINVAL;
793 goto fail;
794 }
795
796 /* Already traced */
797 if (p->p_flag & P_TRACED) {
798 error = EBUSY;
799 goto fail;
800 }
801
802 /* Can't trace an ancestor if you're being traced. */
803 if (curp->p_flag & P_TRACED) {
804 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
805 if (pp == p) {
806 error = EINVAL;
807 goto fail;
808 }
809 }
810 }
811
812
813 /* OK */
814 break;
815
816 case PT_CLEARSTEP:
817 /* Allow thread to clear single step for itself */
818 if (td->td_tid == tid)
819 break;
820
821 /* FALLTHROUGH */
822 default:
823 /* not being traced... */
824 if ((p->p_flag & P_TRACED) == 0) {
825 error = EPERM;
826 goto fail;
827 }
828
829 /* not being traced by YOU */
830 if (p->p_pptr != td->td_proc) {
831 error = EBUSY;
832 goto fail;
833 }
834
835 /* not currently stopped */
836 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
837 p->p_suspcount != p->p_numthreads ||
838 (p->p_flag & P_WAITED) == 0) {
839 error = EBUSY;
840 goto fail;
841 }
842
843 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
844 static int count = 0;
845 if (count++ == 0)
846 printf("P_STOPPED_TRACE not set.\n");
847 }
848
849 /* OK */
850 break;
851 }
852
853 /* Keep this process around until we finish this request. */
854 _PHOLD(p);
855
856 #ifdef FIX_SSTEP
857 /*
858 * Single step fixup ala procfs
859 */
860 FIX_SSTEP(td2);
861 #endif
862
863 /*
864 * Actually do the requests
865 */
866
867 td->td_retval[0] = 0;
868
869 switch (req) {
870 case PT_TRACE_ME:
871 /* set my trace flag and "owner" so it can read/write me */
872 proc_set_traced(p, false);
873 if (p->p_flag & P_PPWAIT)
874 p->p_flag |= P_PPTRACE;
875 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
876 break;
877
878 case PT_ATTACH:
879 /* security check done above */
880 /*
881 * It would be nice if the tracing relationship was separate
882 * from the parent relationship but that would require
883 * another set of links in the proc struct or for "wait"
884 * to scan the entire proc table. To make life easier,
885 * we just re-parent the process we're trying to trace.
886 * The old parent is remembered so we can put things back
887 * on a "detach".
888 */
889 proc_set_traced(p, true);
890 if (p->p_pptr != td->td_proc) {
891 proc_reparent(p, td->td_proc);
892 }
893 data = SIGSTOP;
894 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
895 p->p_oppid);
896 goto sendsig; /* in PT_CONTINUE below */
897
898 case PT_CLEARSTEP:
899 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
900 p->p_pid);
901 error = ptrace_clear_single_step(td2);
902 break;
903
904 case PT_SETSTEP:
905 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
906 p->p_pid);
907 error = ptrace_single_step(td2);
908 break;
909
910 case PT_SUSPEND:
911 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
912 p->p_pid);
913 td2->td_dbgflags |= TDB_SUSPEND;
914 thread_lock(td2);
915 td2->td_flags |= TDF_NEEDSUSPCHK;
916 thread_unlock(td2);
917 break;
918
919 case PT_RESUME:
920 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
921 p->p_pid);
922 td2->td_dbgflags &= ~TDB_SUSPEND;
923 break;
924
925 case PT_FOLLOW_FORK:
926 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
927 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
928 data ? "enabled" : "disabled");
929 if (data)
930 p->p_ptevents |= PTRACE_FORK;
931 else
932 p->p_ptevents &= ~PTRACE_FORK;
933 break;
934
935 case PT_LWP_EVENTS:
936 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
937 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
938 data ? "enabled" : "disabled");
939 if (data)
940 p->p_ptevents |= PTRACE_LWP;
941 else
942 p->p_ptevents &= ~PTRACE_LWP;
943 break;
944
945 case PT_GET_EVENT_MASK:
946 if (data != sizeof(p->p_ptevents)) {
947 error = EINVAL;
948 break;
949 }
950 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
951 p->p_ptevents);
952 *(int *)addr = p->p_ptevents;
953 break;
954
955 case PT_SET_EVENT_MASK:
956 if (data != sizeof(p->p_ptevents)) {
957 error = EINVAL;
958 break;
959 }
960 tmp = *(int *)addr;
961 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
962 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
963 error = EINVAL;
964 break;
965 }
966 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
967 p->p_pid, p->p_ptevents, tmp);
968 p->p_ptevents = tmp;
969 break;
970
971 case PT_STEP:
972 case PT_CONTINUE:
973 case PT_TO_SCE:
974 case PT_TO_SCX:
975 case PT_SYSCALL:
976 case PT_DETACH:
977 /* Zero means do not send any signal */
978 if (data < 0 || data > _SIG_MAXSIG) {
979 error = EINVAL;
980 break;
981 }
982
983 switch (req) {
984 case PT_STEP:
985 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
986 td2->td_tid, p->p_pid, data);
987 error = ptrace_single_step(td2);
988 if (error)
989 goto out;
990 break;
991 case PT_CONTINUE:
992 case PT_TO_SCE:
993 case PT_TO_SCX:
994 case PT_SYSCALL:
995 if (addr != (void *)1) {
996 error = ptrace_set_pc(td2,
997 (u_long)(uintfptr_t)addr);
998 if (error)
999 goto out;
1000 }
1001 switch (req) {
1002 case PT_TO_SCE:
1003 p->p_ptevents |= PTRACE_SCE;
1004 CTR4(KTR_PTRACE,
1005 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1006 p->p_pid, p->p_ptevents,
1007 (u_long)(uintfptr_t)addr, data);
1008 break;
1009 case PT_TO_SCX:
1010 p->p_ptevents |= PTRACE_SCX;
1011 CTR4(KTR_PTRACE,
1012 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1013 p->p_pid, p->p_ptevents,
1014 (u_long)(uintfptr_t)addr, data);
1015 break;
1016 case PT_SYSCALL:
1017 p->p_ptevents |= PTRACE_SYSCALL;
1018 CTR4(KTR_PTRACE,
1019 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1020 p->p_pid, p->p_ptevents,
1021 (u_long)(uintfptr_t)addr, data);
1022 break;
1023 case PT_CONTINUE:
1024 CTR3(KTR_PTRACE,
1025 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1026 p->p_pid, (u_long)(uintfptr_t)addr, data);
1027 break;
1028 }
1029 break;
1030 case PT_DETACH:
1031 /*
1032 * Reset the process parent.
1033 *
1034 * NB: This clears P_TRACED before reparenting
1035 * a detached process back to its original
1036 * parent. Otherwise the debugee will be set
1037 * as an orphan of the debugger.
1038 */
1039 p->p_flag &= ~(P_TRACED | P_WAITED);
1040 if (p->p_oppid != p->p_pptr->p_pid) {
1041 PROC_LOCK(p->p_pptr);
1042 sigqueue_take(p->p_ksi);
1043 PROC_UNLOCK(p->p_pptr);
1044
1045 pp = proc_realparent(p);
1046 proc_reparent(p, pp);
1047 if (pp == initproc)
1048 p->p_sigparent = SIGCHLD;
1049 CTR3(KTR_PTRACE,
1050 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1051 p->p_pid, pp->p_pid, data);
1052 } else
1053 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1054 p->p_pid, data);
1055 p->p_oppid = 0;
1056 p->p_ptevents = 0;
1057 FOREACH_THREAD_IN_PROC(p, td3) {
1058 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1059 sigqueue_delete(&td3->td_sigqueue,
1060 SIGSTOP);
1061 }
1062 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP);
1063 }
1064 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1065 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1066 p->p_flag2 &= ~P2_PTRACE_FSTP;
1067 }
1068
1069 /* should we send SIGCHLD? */
1070 /* childproc_continued(p); */
1071 break;
1072 }
1073
1074 sendsig:
1075 /*
1076 * Clear the pending event for the thread that just
1077 * reported its event (p_xthread). This may not be
1078 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1079 * the debugger is resuming a different thread.
1080 */
1081 td2 = p->p_xthread;
1082 if (proctree_locked) {
1083 sx_xunlock(&proctree_lock);
1084 proctree_locked = 0;
1085 }
1086 p->p_xstat = data;
1087 p->p_xthread = NULL;
1088 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
1089 /* deliver or queue signal */
1090 td2->td_dbgflags &= ~TDB_XSIG;
1091 td2->td_xsig = data;
1092
1093 /*
1094 * P_WKILLED is insurance that a PT_KILL/SIGKILL always
1095 * works immediately, even if another thread is
1096 * unsuspended first and attempts to handle a different
1097 * signal or if the POSIX.1b style signal queue cannot
1098 * accommodate any new signals.
1099 */
1100 if (data == SIGKILL)
1101 p->p_flag |= P_WKILLED;
1102
1103 if (req == PT_DETACH) {
1104 FOREACH_THREAD_IN_PROC(p, td3)
1105 td3->td_dbgflags &= ~TDB_SUSPEND;
1106 }
1107 /*
1108 * unsuspend all threads, to not let a thread run,
1109 * you should use PT_SUSPEND to suspend it before
1110 * continuing process.
1111 */
1112 PROC_SLOCK(p);
1113 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
1114 thread_unsuspend(p);
1115 PROC_SUNLOCK(p);
1116 if (req == PT_ATTACH)
1117 kern_psignal(p, data);
1118 } else {
1119 if (data)
1120 kern_psignal(p, data);
1121 }
1122 break;
1123
1124 case PT_WRITE_I:
1125 case PT_WRITE_D:
1126 td2->td_dbgflags |= TDB_USERWR;
1127 write = 1;
1128 /* FALLTHROUGH */
1129 case PT_READ_I:
1130 case PT_READ_D:
1131 PROC_UNLOCK(p);
1132 tmp = 0;
1133 /* write = 0 set above */
1134 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
1135 iov.iov_len = sizeof(int);
1136 uio.uio_iov = &iov;
1137 uio.uio_iovcnt = 1;
1138 uio.uio_offset = (off_t)(uintptr_t)addr;
1139 uio.uio_resid = sizeof(int);
1140 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */
1141 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
1142 uio.uio_td = td;
1143 error = proc_rwmem(p, &uio);
1144 if (uio.uio_resid != 0) {
1145 /*
1146 * XXX proc_rwmem() doesn't currently return ENOSPC,
1147 * so I think write() can bogusly return 0.
1148 * XXX what happens for short writes? We don't want
1149 * to write partial data.
1150 * XXX proc_rwmem() returns EPERM for other invalid
1151 * addresses. Convert this to EINVAL. Does this
1152 * clobber returns of EPERM for other reasons?
1153 */
1154 if (error == 0 || error == ENOSPC || error == EPERM)
1155 error = EINVAL; /* EOF */
1156 }
1157 if (!write)
1158 td->td_retval[0] = tmp;
1159 if (error == 0) {
1160 if (write)
1161 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1162 p->p_pid, addr, data);
1163 else
1164 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1165 p->p_pid, addr, tmp);
1166 }
1167 PROC_LOCK(p);
1168 break;
1169
1170 case PT_IO:
1171 #ifdef COMPAT_FREEBSD32
1172 if (wrap32) {
1173 piod32 = addr;
1174 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1175 iov.iov_len = piod32->piod_len;
1176 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1177 uio.uio_resid = piod32->piod_len;
1178 } else
1179 #endif
1180 {
1181 piod = addr;
1182 iov.iov_base = piod->piod_addr;
1183 iov.iov_len = piod->piod_len;
1184 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1185 uio.uio_resid = piod->piod_len;
1186 }
1187 uio.uio_iov = &iov;
1188 uio.uio_iovcnt = 1;
1189 uio.uio_segflg = UIO_USERSPACE;
1190 uio.uio_td = td;
1191 #ifdef COMPAT_FREEBSD32
1192 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1193 #else
1194 tmp = piod->piod_op;
1195 #endif
1196 switch (tmp) {
1197 case PIOD_READ_D:
1198 case PIOD_READ_I:
1199 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1200 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1201 uio.uio_rw = UIO_READ;
1202 break;
1203 case PIOD_WRITE_D:
1204 case PIOD_WRITE_I:
1205 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1206 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1207 td2->td_dbgflags |= TDB_USERWR;
1208 uio.uio_rw = UIO_WRITE;
1209 break;
1210 default:
1211 error = EINVAL;
1212 goto out;
1213 }
1214 PROC_UNLOCK(p);
1215 error = proc_rwmem(p, &uio);
1216 #ifdef COMPAT_FREEBSD32
1217 if (wrap32)
1218 piod32->piod_len -= uio.uio_resid;
1219 else
1220 #endif
1221 piod->piod_len -= uio.uio_resid;
1222 PROC_LOCK(p);
1223 break;
1224
1225 case PT_KILL:
1226 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1227 data = SIGKILL;
1228 goto sendsig; /* in PT_CONTINUE above */
1229
1230 case PT_SETREGS:
1231 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1232 p->p_pid);
1233 td2->td_dbgflags |= TDB_USERWR;
1234 error = PROC_WRITE(regs, td2, addr);
1235 break;
1236
1237 case PT_GETREGS:
1238 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1239 p->p_pid);
1240 error = PROC_READ(regs, td2, addr);
1241 break;
1242
1243 case PT_SETFPREGS:
1244 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1245 p->p_pid);
1246 td2->td_dbgflags |= TDB_USERWR;
1247 error = PROC_WRITE(fpregs, td2, addr);
1248 break;
1249
1250 case PT_GETFPREGS:
1251 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1252 p->p_pid);
1253 error = PROC_READ(fpregs, td2, addr);
1254 break;
1255
1256 case PT_SETDBREGS:
1257 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1258 p->p_pid);
1259 td2->td_dbgflags |= TDB_USERWR;
1260 error = PROC_WRITE(dbregs, td2, addr);
1261 break;
1262
1263 case PT_GETDBREGS:
1264 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1265 p->p_pid);
1266 error = PROC_READ(dbregs, td2, addr);
1267 break;
1268
1269 case PT_LWPINFO:
1270 if (data <= 0 ||
1271 #ifdef COMPAT_FREEBSD32
1272 (!wrap32 && data > sizeof(*pl)) ||
1273 (wrap32 && data > sizeof(*pl32))) {
1274 #else
1275 data > sizeof(*pl)) {
1276 #endif
1277 error = EINVAL;
1278 break;
1279 }
1280 #ifdef COMPAT_FREEBSD32
1281 if (wrap32) {
1282 pl = &plr;
1283 pl32 = addr;
1284 } else
1285 #endif
1286 pl = addr;
1287 bzero(pl, sizeof(*pl));
1288 pl->pl_lwpid = td2->td_tid;
1289 pl->pl_event = PL_EVENT_NONE;
1290 pl->pl_flags = 0;
1291 if (td2->td_dbgflags & TDB_XSIG) {
1292 pl->pl_event = PL_EVENT_SIGNAL;
1293 if (td2->td_dbgksi.ksi_signo != 0 &&
1294 #ifdef COMPAT_FREEBSD32
1295 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1296 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1297 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1298 pl_siginfo) + sizeof(struct siginfo32)))
1299 #else
1300 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1301 + sizeof(pl->pl_siginfo)
1302 #endif
1303 ){
1304 pl->pl_flags |= PL_FLAG_SI;
1305 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
1306 }
1307 }
1308 if (td2->td_dbgflags & TDB_SCE)
1309 pl->pl_flags |= PL_FLAG_SCE;
1310 else if (td2->td_dbgflags & TDB_SCX)
1311 pl->pl_flags |= PL_FLAG_SCX;
1312 if (td2->td_dbgflags & TDB_EXEC)
1313 pl->pl_flags |= PL_FLAG_EXEC;
1314 if (td2->td_dbgflags & TDB_FORK) {
1315 pl->pl_flags |= PL_FLAG_FORKED;
1316 pl->pl_child_pid = td2->td_dbg_forked;
1317 if (td2->td_dbgflags & TDB_VFORK)
1318 pl->pl_flags |= PL_FLAG_VFORKED;
1319 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1320 TDB_VFORK)
1321 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1322 if (td2->td_dbgflags & TDB_CHILD)
1323 pl->pl_flags |= PL_FLAG_CHILD;
1324 if (td2->td_dbgflags & TDB_BORN)
1325 pl->pl_flags |= PL_FLAG_BORN;
1326 if (td2->td_dbgflags & TDB_EXIT)
1327 pl->pl_flags |= PL_FLAG_EXITED;
1328 pl->pl_sigmask = td2->td_sigmask;
1329 pl->pl_siglist = td2->td_siglist;
1330 strcpy(pl->pl_tdname, td2->td_name);
1331 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1332 pl->pl_syscall_code = td2->td_dbg_sc_code;
1333 pl->pl_syscall_narg = td2->td_dbg_sc_narg;
1334 } else {
1335 pl->pl_syscall_code = 0;
1336 pl->pl_syscall_narg = 0;
1337 }
1338 #ifdef COMPAT_FREEBSD32
1339 if (wrap32)
1340 ptrace_lwpinfo_to32(pl, pl32);
1341 #endif
1342 CTR6(KTR_PTRACE,
1343 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1344 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1345 pl->pl_child_pid, pl->pl_syscall_code);
1346 break;
1347
1348 case PT_GETNUMLWPS:
1349 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1350 p->p_numthreads);
1351 td->td_retval[0] = p->p_numthreads;
1352 break;
1353
1354 case PT_GETLWPLIST:
1355 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1356 p->p_pid, data, p->p_numthreads);
1357 if (data <= 0) {
1358 error = EINVAL;
1359 break;
1360 }
1361 num = imin(p->p_numthreads, data);
1362 PROC_UNLOCK(p);
1363 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1364 tmp = 0;
1365 PROC_LOCK(p);
1366 FOREACH_THREAD_IN_PROC(p, td2) {
1367 if (tmp >= num)
1368 break;
1369 buf[tmp++] = td2->td_tid;
1370 }
1371 PROC_UNLOCK(p);
1372 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1373 free(buf, M_TEMP);
1374 if (!error)
1375 td->td_retval[0] = tmp;
1376 PROC_LOCK(p);
1377 break;
1378
1379 case PT_VM_TIMESTAMP:
1380 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1381 p->p_pid, p->p_vmspace->vm_map.timestamp);
1382 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1383 break;
1384
1385 case PT_VM_ENTRY:
1386 PROC_UNLOCK(p);
1387 #ifdef COMPAT_FREEBSD32
1388 if (wrap32)
1389 error = ptrace_vm_entry32(td, p, addr);
1390 else
1391 #endif
1392 error = ptrace_vm_entry(td, p, addr);
1393 PROC_LOCK(p);
1394 break;
1395
1396 default:
1397 #ifdef __HAVE_PTRACE_MACHDEP
1398 if (req >= PT_FIRSTMACH) {
1399 PROC_UNLOCK(p);
1400 error = cpu_ptrace(td2, req, addr, data);
1401 PROC_LOCK(p);
1402 } else
1403 #endif
1404 /* Unknown request. */
1405 error = EINVAL;
1406 break;
1407 }
1408
1409 out:
1410 /* Drop our hold on this process now that the request has completed. */
1411 _PRELE(p);
1412 fail:
1413 PROC_UNLOCK(p);
1414 if (proctree_locked)
1415 sx_xunlock(&proctree_lock);
1416 return (error);
1417 }
1418 #undef PROC_READ
1419 #undef PROC_WRITE
1420
1421 /*
1422 * Stop a process because of a debugging event;
1423 * stay stopped until p->p_step is cleared
1424 * (cleared by PIOCCONT in procfs).
1425 */
1426 void
1427 stopevent(struct proc *p, unsigned int event, unsigned int val)
1428 {
1429
1430 PROC_LOCK_ASSERT(p, MA_OWNED);
1431 p->p_step = 1;
1432 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1433 val);
1434 do {
1435 p->p_xstat = val;
1436 p->p_xthread = NULL;
1437 p->p_stype = event; /* Which event caused the stop? */
1438 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1439 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1440 } while (p->p_step);
1441 }
1442