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: releng/11.1/sys/kern/sys_process.c 325868 2017-11-15 22:39:41Z gordon $");
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
91 struct ptrace_lwpinfo32 {
92 lwpid_t pl_lwpid; /* LWP described. */
93 int pl_event; /* Event that stopped the LWP. */
94 int pl_flags; /* LWP flags. */
95 sigset_t pl_sigmask; /* LWP signal mask */
96 sigset_t pl_siglist; /* LWP pending signal */
97 struct siginfo32 pl_siginfo; /* siginfo for signal */
98 char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */
99 pid_t pl_child_pid; /* New child pid */
100 u_int pl_syscall_code;
101 u_int pl_syscall_narg;
102 };
103
104 #endif
105
106 /*
107 * Functions implemented using PROC_ACTION():
108 *
109 * proc_read_regs(proc, regs)
110 * Get the current user-visible register set from the process
111 * and copy it into the regs structure (<machine/reg.h>).
112 * The process is stopped at the time read_regs is called.
113 *
114 * proc_write_regs(proc, regs)
115 * Update the current register set from the passed in regs
116 * structure. Take care to avoid clobbering special CPU
117 * registers or privileged bits in the PSL.
118 * Depending on the architecture this may have fix-up work to do,
119 * especially if the IAR or PCW are modified.
120 * The process is stopped at the time write_regs is called.
121 *
122 * proc_read_fpregs, proc_write_fpregs
123 * deal with the floating point register set, otherwise as above.
124 *
125 * proc_read_dbregs, proc_write_dbregs
126 * deal with the processor debug register set, otherwise as above.
127 *
128 * proc_sstep(proc)
129 * Arrange for the process to trap after executing a single instruction.
130 */
131
132 #define PROC_ACTION(action) do { \
133 int error; \
134 \
135 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
136 if ((td->td_proc->p_flag & P_INMEM) == 0) \
137 error = EIO; \
138 else \
139 error = (action); \
140 return (error); \
141 } while(0)
142
143 int
144 proc_read_regs(struct thread *td, struct reg *regs)
145 {
146
147 PROC_ACTION(fill_regs(td, regs));
148 }
149
150 int
151 proc_write_regs(struct thread *td, struct reg *regs)
152 {
153
154 PROC_ACTION(set_regs(td, regs));
155 }
156
157 int
158 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
159 {
160
161 PROC_ACTION(fill_dbregs(td, dbregs));
162 }
163
164 int
165 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
166 {
167
168 PROC_ACTION(set_dbregs(td, dbregs));
169 }
170
171 /*
172 * Ptrace doesn't support fpregs at all, and there are no security holes
173 * or translations for fpregs, so we can just copy them.
174 */
175 int
176 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
177 {
178
179 PROC_ACTION(fill_fpregs(td, fpregs));
180 }
181
182 int
183 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
184 {
185
186 PROC_ACTION(set_fpregs(td, fpregs));
187 }
188
189 #ifdef COMPAT_FREEBSD32
190 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
191 int
192 proc_read_regs32(struct thread *td, struct reg32 *regs32)
193 {
194
195 PROC_ACTION(fill_regs32(td, regs32));
196 }
197
198 int
199 proc_write_regs32(struct thread *td, struct reg32 *regs32)
200 {
201
202 PROC_ACTION(set_regs32(td, regs32));
203 }
204
205 int
206 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
207 {
208
209 PROC_ACTION(fill_dbregs32(td, dbregs32));
210 }
211
212 int
213 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
214 {
215
216 PROC_ACTION(set_dbregs32(td, dbregs32));
217 }
218
219 int
220 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
221 {
222
223 PROC_ACTION(fill_fpregs32(td, fpregs32));
224 }
225
226 int
227 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
228 {
229
230 PROC_ACTION(set_fpregs32(td, fpregs32));
231 }
232 #endif
233
234 int
235 proc_sstep(struct thread *td)
236 {
237
238 PROC_ACTION(ptrace_single_step(td));
239 }
240
241 int
242 proc_rwmem(struct proc *p, struct uio *uio)
243 {
244 vm_map_t map;
245 vm_offset_t pageno; /* page number */
246 vm_prot_t reqprot;
247 int error, fault_flags, page_offset, writing;
248
249 /*
250 * Assert that someone has locked this vmspace. (Should be
251 * curthread but we can't assert that.) This keeps the process
252 * from exiting out from under us until this operation completes.
253 */
254 PROC_ASSERT_HELD(p);
255 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
256
257 /*
258 * The map we want...
259 */
260 map = &p->p_vmspace->vm_map;
261
262 /*
263 * If we are writing, then we request vm_fault() to create a private
264 * copy of each page. Since these copies will not be writeable by the
265 * process, we must explicity request that they be dirtied.
266 */
267 writing = uio->uio_rw == UIO_WRITE;
268 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
269 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
270
271 /*
272 * Only map in one page at a time. We don't have to, but it
273 * makes things easier. This way is trivial - right?
274 */
275 do {
276 vm_offset_t uva;
277 u_int len;
278 vm_page_t m;
279
280 uva = (vm_offset_t)uio->uio_offset;
281
282 /*
283 * Get the page number of this segment.
284 */
285 pageno = trunc_page(uva);
286 page_offset = uva - pageno;
287
288 /*
289 * How many bytes to copy
290 */
291 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
292
293 /*
294 * Fault and hold the page on behalf of the process.
295 */
296 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
297 if (error != KERN_SUCCESS) {
298 if (error == KERN_RESOURCE_SHORTAGE)
299 error = ENOMEM;
300 else
301 error = EFAULT;
302 break;
303 }
304
305 /*
306 * Now do the i/o move.
307 */
308 error = uiomove_fromphys(&m, page_offset, len, uio);
309
310 /* Make the I-cache coherent for breakpoints. */
311 if (writing && error == 0) {
312 vm_map_lock_read(map);
313 if (vm_map_check_protection(map, pageno, pageno +
314 PAGE_SIZE, VM_PROT_EXECUTE))
315 vm_sync_icache(map, uva, len);
316 vm_map_unlock_read(map);
317 }
318
319 /*
320 * Release the page.
321 */
322 vm_page_lock(m);
323 vm_page_unhold(m);
324 vm_page_unlock(m);
325
326 } while (error == 0 && uio->uio_resid > 0);
327
328 return (error);
329 }
330
331 static ssize_t
332 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
333 size_t len, enum uio_rw rw)
334 {
335 struct iovec iov;
336 struct uio uio;
337 ssize_t slen;
338 int error;
339
340 MPASS(len < SSIZE_MAX);
341 slen = (ssize_t)len;
342
343 iov.iov_base = (caddr_t)buf;
344 iov.iov_len = len;
345 uio.uio_iov = &iov;
346 uio.uio_iovcnt = 1;
347 uio.uio_offset = va;
348 uio.uio_resid = slen;
349 uio.uio_segflg = UIO_SYSSPACE;
350 uio.uio_rw = rw;
351 uio.uio_td = td;
352 error = proc_rwmem(p, &uio);
353 if (uio.uio_resid == slen)
354 return (-1);
355 return (slen - uio.uio_resid);
356 }
357
358 ssize_t
359 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
360 size_t len)
361 {
362
363 return (proc_iop(td, p, va, buf, len, UIO_READ));
364 }
365
366 ssize_t
367 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
368 size_t len)
369 {
370
371 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
372 }
373
374 static int
375 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
376 {
377 struct vattr vattr;
378 vm_map_t map;
379 vm_map_entry_t entry;
380 vm_object_t obj, tobj, lobj;
381 struct vmspace *vm;
382 struct vnode *vp;
383 char *freepath, *fullpath;
384 u_int pathlen;
385 int error, index;
386
387 error = 0;
388 obj = NULL;
389
390 vm = vmspace_acquire_ref(p);
391 map = &vm->vm_map;
392 vm_map_lock_read(map);
393
394 do {
395 entry = map->header.next;
396 index = 0;
397 while (index < pve->pve_entry && entry != &map->header) {
398 entry = entry->next;
399 index++;
400 }
401 if (index != pve->pve_entry) {
402 error = EINVAL;
403 break;
404 }
405 while (entry != &map->header &&
406 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
407 entry = entry->next;
408 index++;
409 }
410 if (entry == &map->header) {
411 error = ENOENT;
412 break;
413 }
414
415 /* We got an entry. */
416 pve->pve_entry = index + 1;
417 pve->pve_timestamp = map->timestamp;
418 pve->pve_start = entry->start;
419 pve->pve_end = entry->end - 1;
420 pve->pve_offset = entry->offset;
421 pve->pve_prot = entry->protection;
422
423 /* Backing object's path needed? */
424 if (pve->pve_pathlen == 0)
425 break;
426
427 pathlen = pve->pve_pathlen;
428 pve->pve_pathlen = 0;
429
430 obj = entry->object.vm_object;
431 if (obj != NULL)
432 VM_OBJECT_RLOCK(obj);
433 } while (0);
434
435 vm_map_unlock_read(map);
436
437 pve->pve_fsid = VNOVAL;
438 pve->pve_fileid = VNOVAL;
439
440 if (error == 0 && obj != NULL) {
441 lobj = obj;
442 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
443 if (tobj != obj)
444 VM_OBJECT_RLOCK(tobj);
445 if (lobj != obj)
446 VM_OBJECT_RUNLOCK(lobj);
447 lobj = tobj;
448 pve->pve_offset += tobj->backing_object_offset;
449 }
450 vp = vm_object_vnode(lobj);
451 if (vp != NULL)
452 vref(vp);
453 if (lobj != obj)
454 VM_OBJECT_RUNLOCK(lobj);
455 VM_OBJECT_RUNLOCK(obj);
456
457 if (vp != NULL) {
458 freepath = NULL;
459 fullpath = NULL;
460 vn_fullpath(td, vp, &fullpath, &freepath);
461 vn_lock(vp, LK_SHARED | LK_RETRY);
462 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
463 pve->pve_fileid = vattr.va_fileid;
464 pve->pve_fsid = vattr.va_fsid;
465 }
466 vput(vp);
467
468 if (fullpath != NULL) {
469 pve->pve_pathlen = strlen(fullpath) + 1;
470 if (pve->pve_pathlen <= pathlen) {
471 error = copyout(fullpath, pve->pve_path,
472 pve->pve_pathlen);
473 } else
474 error = ENAMETOOLONG;
475 }
476 if (freepath != NULL)
477 free(freepath, M_TEMP);
478 }
479 }
480 vmspace_free(vm);
481 if (error == 0)
482 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
483 p->p_pid, pve->pve_entry, pve->pve_start);
484
485 return (error);
486 }
487
488 #ifdef COMPAT_FREEBSD32
489 static int
490 ptrace_vm_entry32(struct thread *td, struct proc *p,
491 struct ptrace_vm_entry32 *pve32)
492 {
493 struct ptrace_vm_entry pve;
494 int error;
495
496 pve.pve_entry = pve32->pve_entry;
497 pve.pve_pathlen = pve32->pve_pathlen;
498 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
499
500 error = ptrace_vm_entry(td, p, &pve);
501 if (error == 0) {
502 pve32->pve_entry = pve.pve_entry;
503 pve32->pve_timestamp = pve.pve_timestamp;
504 pve32->pve_start = pve.pve_start;
505 pve32->pve_end = pve.pve_end;
506 pve32->pve_offset = pve.pve_offset;
507 pve32->pve_prot = pve.pve_prot;
508 pve32->pve_fileid = pve.pve_fileid;
509 pve32->pve_fsid = pve.pve_fsid;
510 }
511
512 pve32->pve_pathlen = pve.pve_pathlen;
513 return (error);
514 }
515
516 static void
517 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
518 struct ptrace_lwpinfo32 *pl32)
519 {
520
521 bzero(pl32, sizeof(*pl32));
522 pl32->pl_lwpid = pl->pl_lwpid;
523 pl32->pl_event = pl->pl_event;
524 pl32->pl_flags = pl->pl_flags;
525 pl32->pl_sigmask = pl->pl_sigmask;
526 pl32->pl_siglist = pl->pl_siglist;
527 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
528 strcpy(pl32->pl_tdname, pl->pl_tdname);
529 pl32->pl_child_pid = pl->pl_child_pid;
530 pl32->pl_syscall_code = pl->pl_syscall_code;
531 pl32->pl_syscall_narg = pl->pl_syscall_narg;
532 }
533 #endif /* COMPAT_FREEBSD32 */
534
535 /*
536 * Process debugging system call.
537 */
538 #ifndef _SYS_SYSPROTO_H_
539 struct ptrace_args {
540 int req;
541 pid_t pid;
542 caddr_t addr;
543 int data;
544 };
545 #endif
546
547 #ifdef COMPAT_FREEBSD32
548 /*
549 * This CPP subterfuge is to try and reduce the number of ifdefs in
550 * the body of the code.
551 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
552 * becomes either:
553 * copyin(uap->addr, &r.reg, sizeof r.reg);
554 * or
555 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
556 * .. except this is done at runtime.
557 */
558 #define COPYIN(u, k, s) wrap32 ? \
559 copyin(u, k ## 32, s ## 32) : \
560 copyin(u, k, s)
561 #define COPYOUT(k, u, s) wrap32 ? \
562 copyout(k ## 32, u, s ## 32) : \
563 copyout(k, u, s)
564 #else
565 #define COPYIN(u, k, s) copyin(u, k, s)
566 #define COPYOUT(k, u, s) copyout(k, u, s)
567 #endif
568 int
569 sys_ptrace(struct thread *td, struct ptrace_args *uap)
570 {
571 /*
572 * XXX this obfuscation is to reduce stack usage, but the register
573 * structs may be too large to put on the stack anyway.
574 */
575 union {
576 struct ptrace_io_desc piod;
577 struct ptrace_lwpinfo pl;
578 struct ptrace_vm_entry pve;
579 struct dbreg dbreg;
580 struct fpreg fpreg;
581 struct reg reg;
582 #ifdef COMPAT_FREEBSD32
583 struct dbreg32 dbreg32;
584 struct fpreg32 fpreg32;
585 struct reg32 reg32;
586 struct ptrace_io_desc32 piod32;
587 struct ptrace_lwpinfo32 pl32;
588 struct ptrace_vm_entry32 pve32;
589 #endif
590 int ptevents;
591 } r;
592 void *addr;
593 int error = 0;
594 #ifdef COMPAT_FREEBSD32
595 int wrap32 = 0;
596
597 if (SV_CURPROC_FLAG(SV_ILP32))
598 wrap32 = 1;
599 #endif
600 AUDIT_ARG_PID(uap->pid);
601 AUDIT_ARG_CMD(uap->req);
602 AUDIT_ARG_VALUE(uap->data);
603 addr = &r;
604 switch (uap->req) {
605 case PT_GET_EVENT_MASK:
606 case PT_GETREGS:
607 case PT_GETFPREGS:
608 case PT_GETDBREGS:
609 case PT_LWPINFO:
610 break;
611 case PT_SETREGS:
612 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
613 break;
614 case PT_SETFPREGS:
615 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
616 break;
617 case PT_SETDBREGS:
618 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
619 break;
620 case PT_SET_EVENT_MASK:
621 if (uap->data != sizeof(r.ptevents))
622 error = EINVAL;
623 else
624 error = copyin(uap->addr, &r.ptevents, uap->data);
625 break;
626 case PT_IO:
627 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
628 break;
629 case PT_VM_ENTRY:
630 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
631 break;
632 default:
633 addr = uap->addr;
634 break;
635 }
636 if (error)
637 return (error);
638
639 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
640 if (error)
641 return (error);
642
643 switch (uap->req) {
644 case PT_VM_ENTRY:
645 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
646 break;
647 case PT_IO:
648 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
649 break;
650 case PT_GETREGS:
651 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
652 break;
653 case PT_GETFPREGS:
654 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
655 break;
656 case PT_GETDBREGS:
657 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
658 break;
659 case PT_GET_EVENT_MASK:
660 /* NB: The size in uap->data is validated in kern_ptrace(). */
661 error = copyout(&r.ptevents, uap->addr, uap->data);
662 break;
663 case PT_LWPINFO:
664 /* NB: The size in uap->data is validated in kern_ptrace(). */
665 error = copyout(&r.pl, uap->addr, uap->data);
666 break;
667 }
668
669 return (error);
670 }
671 #undef COPYIN
672 #undef COPYOUT
673
674 #ifdef COMPAT_FREEBSD32
675 /*
676 * PROC_READ(regs, td2, addr);
677 * becomes either:
678 * proc_read_regs(td2, addr);
679 * or
680 * proc_read_regs32(td2, addr);
681 * .. except this is done at runtime. There is an additional
682 * complication in that PROC_WRITE disallows 32 bit consumers
683 * from writing to 64 bit address space targets.
684 */
685 #define PROC_READ(w, t, a) wrap32 ? \
686 proc_read_ ## w ## 32(t, a) : \
687 proc_read_ ## w (t, a)
688 #define PROC_WRITE(w, t, a) wrap32 ? \
689 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
690 proc_write_ ## w (t, a)
691 #else
692 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
693 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
694 #endif
695
696 void
697 proc_set_traced(struct proc *p, bool stop)
698 {
699
700 PROC_LOCK_ASSERT(p, MA_OWNED);
701 p->p_flag |= P_TRACED;
702 if (stop)
703 p->p_flag2 |= P2_PTRACE_FSTP;
704 p->p_ptevents = PTRACE_DEFAULT;
705 p->p_oppid = p->p_pptr->p_pid;
706 }
707
708 int
709 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
710 {
711 struct iovec iov;
712 struct uio uio;
713 struct proc *curp, *p, *pp;
714 struct thread *td2 = NULL, *td3;
715 struct ptrace_io_desc *piod = NULL;
716 struct ptrace_lwpinfo *pl;
717 int error, num, tmp;
718 int proctree_locked = 0;
719 lwpid_t tid = 0, *buf;
720 #ifdef COMPAT_FREEBSD32
721 int wrap32 = 0, safe = 0;
722 struct ptrace_io_desc32 *piod32 = NULL;
723 struct ptrace_lwpinfo32 *pl32 = NULL;
724 struct ptrace_lwpinfo plr;
725 #endif
726
727 curp = td->td_proc;
728
729 /* Lock proctree before locking the process. */
730 switch (req) {
731 case PT_TRACE_ME:
732 case PT_ATTACH:
733 case PT_STEP:
734 case PT_CONTINUE:
735 case PT_TO_SCE:
736 case PT_TO_SCX:
737 case PT_SYSCALL:
738 case PT_FOLLOW_FORK:
739 case PT_LWP_EVENTS:
740 case PT_GET_EVENT_MASK:
741 case PT_SET_EVENT_MASK:
742 case PT_DETACH:
743 sx_xlock(&proctree_lock);
744 proctree_locked = 1;
745 break;
746 default:
747 break;
748 }
749
750 if (req == PT_TRACE_ME) {
751 p = td->td_proc;
752 PROC_LOCK(p);
753 } else {
754 if (pid <= PID_MAX) {
755 if ((p = pfind(pid)) == NULL) {
756 if (proctree_locked)
757 sx_xunlock(&proctree_lock);
758 return (ESRCH);
759 }
760 } else {
761 td2 = tdfind(pid, -1);
762 if (td2 == NULL) {
763 if (proctree_locked)
764 sx_xunlock(&proctree_lock);
765 return (ESRCH);
766 }
767 p = td2->td_proc;
768 tid = pid;
769 pid = p->p_pid;
770 }
771 }
772 AUDIT_ARG_PROCESS(p);
773
774 if ((p->p_flag & P_WEXIT) != 0) {
775 error = ESRCH;
776 goto fail;
777 }
778 if ((error = p_cansee(td, p)) != 0)
779 goto fail;
780
781 if ((error = p_candebug(td, p)) != 0)
782 goto fail;
783
784 /*
785 * System processes can't be debugged.
786 */
787 if ((p->p_flag & P_SYSTEM) != 0) {
788 error = EINVAL;
789 goto fail;
790 }
791
792 if (tid == 0) {
793 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
794 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
795 td2 = p->p_xthread;
796 } else {
797 td2 = FIRST_THREAD_IN_PROC(p);
798 }
799 tid = td2->td_tid;
800 }
801
802 #ifdef COMPAT_FREEBSD32
803 /*
804 * Test if we're a 32 bit client and what the target is.
805 * Set the wrap controls accordingly.
806 */
807 if (SV_CURPROC_FLAG(SV_ILP32)) {
808 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
809 safe = 1;
810 wrap32 = 1;
811 }
812 #endif
813 /*
814 * Permissions check
815 */
816 switch (req) {
817 case PT_TRACE_ME:
818 /*
819 * Always legal, when there is a parent process which
820 * could trace us. Otherwise, reject.
821 */
822 if ((p->p_flag & P_TRACED) != 0) {
823 error = EBUSY;
824 goto fail;
825 }
826 if (p->p_pptr == initproc) {
827 error = EPERM;
828 goto fail;
829 }
830 break;
831
832 case PT_ATTACH:
833 /* Self */
834 if (p == td->td_proc) {
835 error = EINVAL;
836 goto fail;
837 }
838
839 /* Already traced */
840 if (p->p_flag & P_TRACED) {
841 error = EBUSY;
842 goto fail;
843 }
844
845 /* Can't trace an ancestor if you're being traced. */
846 if (curp->p_flag & P_TRACED) {
847 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
848 if (pp == p) {
849 error = EINVAL;
850 goto fail;
851 }
852 }
853 }
854
855
856 /* OK */
857 break;
858
859 case PT_CLEARSTEP:
860 /* Allow thread to clear single step for itself */
861 if (td->td_tid == tid)
862 break;
863
864 /* FALLTHROUGH */
865 default:
866 /* not being traced... */
867 if ((p->p_flag & P_TRACED) == 0) {
868 error = EPERM;
869 goto fail;
870 }
871
872 /* not being traced by YOU */
873 if (p->p_pptr != td->td_proc) {
874 error = EBUSY;
875 goto fail;
876 }
877
878 /* not currently stopped */
879 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
880 p->p_suspcount != p->p_numthreads ||
881 (p->p_flag & P_WAITED) == 0) {
882 error = EBUSY;
883 goto fail;
884 }
885
886 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
887 static int count = 0;
888 if (count++ == 0)
889 printf("P_STOPPED_TRACE not set.\n");
890 }
891
892 /* OK */
893 break;
894 }
895
896 /* Keep this process around until we finish this request. */
897 _PHOLD(p);
898
899 #ifdef FIX_SSTEP
900 /*
901 * Single step fixup ala procfs
902 */
903 FIX_SSTEP(td2);
904 #endif
905
906 /*
907 * Actually do the requests
908 */
909
910 td->td_retval[0] = 0;
911
912 switch (req) {
913 case PT_TRACE_ME:
914 /* set my trace flag and "owner" so it can read/write me */
915 proc_set_traced(p, false);
916 if (p->p_flag & P_PPWAIT)
917 p->p_flag |= P_PPTRACE;
918 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
919 break;
920
921 case PT_ATTACH:
922 /* security check done above */
923 /*
924 * It would be nice if the tracing relationship was separate
925 * from the parent relationship but that would require
926 * another set of links in the proc struct or for "wait"
927 * to scan the entire proc table. To make life easier,
928 * we just re-parent the process we're trying to trace.
929 * The old parent is remembered so we can put things back
930 * on a "detach".
931 */
932 proc_set_traced(p, true);
933 if (p->p_pptr != td->td_proc) {
934 proc_reparent(p, td->td_proc);
935 }
936 data = SIGSTOP;
937 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
938 p->p_oppid);
939 goto sendsig; /* in PT_CONTINUE below */
940
941 case PT_CLEARSTEP:
942 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
943 p->p_pid);
944 error = ptrace_clear_single_step(td2);
945 break;
946
947 case PT_SETSTEP:
948 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
949 p->p_pid);
950 error = ptrace_single_step(td2);
951 break;
952
953 case PT_SUSPEND:
954 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
955 p->p_pid);
956 td2->td_dbgflags |= TDB_SUSPEND;
957 thread_lock(td2);
958 td2->td_flags |= TDF_NEEDSUSPCHK;
959 thread_unlock(td2);
960 break;
961
962 case PT_RESUME:
963 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
964 p->p_pid);
965 td2->td_dbgflags &= ~TDB_SUSPEND;
966 break;
967
968 case PT_FOLLOW_FORK:
969 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
970 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
971 data ? "enabled" : "disabled");
972 if (data)
973 p->p_ptevents |= PTRACE_FORK;
974 else
975 p->p_ptevents &= ~PTRACE_FORK;
976 break;
977
978 case PT_LWP_EVENTS:
979 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
980 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
981 data ? "enabled" : "disabled");
982 if (data)
983 p->p_ptevents |= PTRACE_LWP;
984 else
985 p->p_ptevents &= ~PTRACE_LWP;
986 break;
987
988 case PT_GET_EVENT_MASK:
989 if (data != sizeof(p->p_ptevents)) {
990 error = EINVAL;
991 break;
992 }
993 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
994 p->p_ptevents);
995 *(int *)addr = p->p_ptevents;
996 break;
997
998 case PT_SET_EVENT_MASK:
999 if (data != sizeof(p->p_ptevents)) {
1000 error = EINVAL;
1001 break;
1002 }
1003 tmp = *(int *)addr;
1004 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1005 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
1006 error = EINVAL;
1007 break;
1008 }
1009 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1010 p->p_pid, p->p_ptevents, tmp);
1011 p->p_ptevents = tmp;
1012 break;
1013
1014 case PT_STEP:
1015 case PT_CONTINUE:
1016 case PT_TO_SCE:
1017 case PT_TO_SCX:
1018 case PT_SYSCALL:
1019 case PT_DETACH:
1020 /* Zero means do not send any signal */
1021 if (data < 0 || data > _SIG_MAXSIG) {
1022 error = EINVAL;
1023 break;
1024 }
1025
1026 switch (req) {
1027 case PT_STEP:
1028 CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
1029 td2->td_tid, p->p_pid);
1030 error = ptrace_single_step(td2);
1031 if (error)
1032 goto out;
1033 break;
1034 case PT_CONTINUE:
1035 case PT_TO_SCE:
1036 case PT_TO_SCX:
1037 case PT_SYSCALL:
1038 if (addr != (void *)1) {
1039 error = ptrace_set_pc(td2,
1040 (u_long)(uintfptr_t)addr);
1041 if (error)
1042 goto out;
1043 }
1044 switch (req) {
1045 case PT_TO_SCE:
1046 p->p_ptevents |= PTRACE_SCE;
1047 CTR4(KTR_PTRACE,
1048 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1049 p->p_pid, p->p_ptevents,
1050 (u_long)(uintfptr_t)addr, data);
1051 break;
1052 case PT_TO_SCX:
1053 p->p_ptevents |= PTRACE_SCX;
1054 CTR4(KTR_PTRACE,
1055 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1056 p->p_pid, p->p_ptevents,
1057 (u_long)(uintfptr_t)addr, data);
1058 break;
1059 case PT_SYSCALL:
1060 p->p_ptevents |= PTRACE_SYSCALL;
1061 CTR4(KTR_PTRACE,
1062 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1063 p->p_pid, p->p_ptevents,
1064 (u_long)(uintfptr_t)addr, data);
1065 break;
1066 case PT_CONTINUE:
1067 CTR3(KTR_PTRACE,
1068 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1069 p->p_pid, (u_long)(uintfptr_t)addr, data);
1070 break;
1071 }
1072 break;
1073 case PT_DETACH:
1074 /*
1075 * Reset the process parent.
1076 *
1077 * NB: This clears P_TRACED before reparenting
1078 * a detached process back to its original
1079 * parent. Otherwise the debugee will be set
1080 * as an orphan of the debugger.
1081 */
1082 p->p_flag &= ~(P_TRACED | P_WAITED);
1083 if (p->p_oppid != p->p_pptr->p_pid) {
1084 PROC_LOCK(p->p_pptr);
1085 sigqueue_take(p->p_ksi);
1086 PROC_UNLOCK(p->p_pptr);
1087
1088 pp = proc_realparent(p);
1089 proc_reparent(p, pp);
1090 if (pp == initproc)
1091 p->p_sigparent = SIGCHLD;
1092 CTR3(KTR_PTRACE,
1093 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1094 p->p_pid, pp->p_pid, data);
1095 } else
1096 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1097 p->p_pid, data);
1098 p->p_oppid = 0;
1099 p->p_ptevents = 0;
1100 FOREACH_THREAD_IN_PROC(p, td3) {
1101 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1102 sigqueue_delete(&td3->td_sigqueue,
1103 SIGSTOP);
1104 }
1105 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP);
1106 }
1107 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1108 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1109 p->p_flag2 &= ~P2_PTRACE_FSTP;
1110 }
1111
1112 /* should we send SIGCHLD? */
1113 /* childproc_continued(p); */
1114 break;
1115 }
1116
1117 sendsig:
1118 if (proctree_locked) {
1119 sx_xunlock(&proctree_lock);
1120 proctree_locked = 0;
1121 }
1122 p->p_xsig = data;
1123 p->p_xthread = NULL;
1124 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
1125 /* deliver or queue signal */
1126 td2->td_dbgflags &= ~TDB_XSIG;
1127 td2->td_xsig = data;
1128
1129 /*
1130 * P_WKILLED is insurance that a PT_KILL/SIGKILL always
1131 * works immediately, even if another thread is
1132 * unsuspended first and attempts to handle a different
1133 * signal or if the POSIX.1b style signal queue cannot
1134 * accommodate any new signals.
1135 */
1136 if (data == SIGKILL)
1137 p->p_flag |= P_WKILLED;
1138
1139 if (req == PT_DETACH) {
1140 FOREACH_THREAD_IN_PROC(p, td3)
1141 td3->td_dbgflags &= ~TDB_SUSPEND;
1142 }
1143 /*
1144 * unsuspend all threads, to not let a thread run,
1145 * you should use PT_SUSPEND to suspend it before
1146 * continuing process.
1147 */
1148 PROC_SLOCK(p);
1149 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
1150 thread_unsuspend(p);
1151 PROC_SUNLOCK(p);
1152 if (req == PT_ATTACH)
1153 kern_psignal(p, data);
1154 } else {
1155 if (data)
1156 kern_psignal(p, data);
1157 }
1158 break;
1159
1160 case PT_WRITE_I:
1161 case PT_WRITE_D:
1162 td2->td_dbgflags |= TDB_USERWR;
1163 PROC_UNLOCK(p);
1164 error = 0;
1165 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1166 sizeof(int)) != sizeof(int))
1167 error = ENOMEM;
1168 else
1169 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1170 p->p_pid, addr, data);
1171 PROC_LOCK(p);
1172 break;
1173
1174 case PT_READ_I:
1175 case PT_READ_D:
1176 PROC_UNLOCK(p);
1177 error = tmp = 0;
1178 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1179 sizeof(int)) != sizeof(int))
1180 error = ENOMEM;
1181 else
1182 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1183 p->p_pid, addr, tmp);
1184 td->td_retval[0] = tmp;
1185 PROC_LOCK(p);
1186 break;
1187
1188 case PT_IO:
1189 #ifdef COMPAT_FREEBSD32
1190 if (wrap32) {
1191 piod32 = addr;
1192 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1193 iov.iov_len = piod32->piod_len;
1194 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1195 uio.uio_resid = piod32->piod_len;
1196 } else
1197 #endif
1198 {
1199 piod = addr;
1200 iov.iov_base = piod->piod_addr;
1201 iov.iov_len = piod->piod_len;
1202 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1203 uio.uio_resid = piod->piod_len;
1204 }
1205 uio.uio_iov = &iov;
1206 uio.uio_iovcnt = 1;
1207 uio.uio_segflg = UIO_USERSPACE;
1208 uio.uio_td = td;
1209 #ifdef COMPAT_FREEBSD32
1210 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1211 #else
1212 tmp = piod->piod_op;
1213 #endif
1214 switch (tmp) {
1215 case PIOD_READ_D:
1216 case PIOD_READ_I:
1217 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1218 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1219 uio.uio_rw = UIO_READ;
1220 break;
1221 case PIOD_WRITE_D:
1222 case PIOD_WRITE_I:
1223 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1224 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1225 td2->td_dbgflags |= TDB_USERWR;
1226 uio.uio_rw = UIO_WRITE;
1227 break;
1228 default:
1229 error = EINVAL;
1230 goto out;
1231 }
1232 PROC_UNLOCK(p);
1233 error = proc_rwmem(p, &uio);
1234 #ifdef COMPAT_FREEBSD32
1235 if (wrap32)
1236 piod32->piod_len -= uio.uio_resid;
1237 else
1238 #endif
1239 piod->piod_len -= uio.uio_resid;
1240 PROC_LOCK(p);
1241 break;
1242
1243 case PT_KILL:
1244 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1245 data = SIGKILL;
1246 goto sendsig; /* in PT_CONTINUE above */
1247
1248 case PT_SETREGS:
1249 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1250 p->p_pid);
1251 td2->td_dbgflags |= TDB_USERWR;
1252 error = PROC_WRITE(regs, td2, addr);
1253 break;
1254
1255 case PT_GETREGS:
1256 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1257 p->p_pid);
1258 error = PROC_READ(regs, td2, addr);
1259 break;
1260
1261 case PT_SETFPREGS:
1262 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1263 p->p_pid);
1264 td2->td_dbgflags |= TDB_USERWR;
1265 error = PROC_WRITE(fpregs, td2, addr);
1266 break;
1267
1268 case PT_GETFPREGS:
1269 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1270 p->p_pid);
1271 error = PROC_READ(fpregs, td2, addr);
1272 break;
1273
1274 case PT_SETDBREGS:
1275 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1276 p->p_pid);
1277 td2->td_dbgflags |= TDB_USERWR;
1278 error = PROC_WRITE(dbregs, td2, addr);
1279 break;
1280
1281 case PT_GETDBREGS:
1282 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1283 p->p_pid);
1284 error = PROC_READ(dbregs, td2, addr);
1285 break;
1286
1287 case PT_LWPINFO:
1288 if (data <= 0 ||
1289 #ifdef COMPAT_FREEBSD32
1290 (!wrap32 && data > sizeof(*pl)) ||
1291 (wrap32 && data > sizeof(*pl32))) {
1292 #else
1293 data > sizeof(*pl)) {
1294 #endif
1295 error = EINVAL;
1296 break;
1297 }
1298 #ifdef COMPAT_FREEBSD32
1299 if (wrap32) {
1300 pl = &plr;
1301 pl32 = addr;
1302 } else
1303 #endif
1304 pl = addr;
1305 bzero(pl, sizeof(*pl));
1306 pl->pl_lwpid = td2->td_tid;
1307 pl->pl_event = PL_EVENT_NONE;
1308 pl->pl_flags = 0;
1309 if (td2->td_dbgflags & TDB_XSIG) {
1310 pl->pl_event = PL_EVENT_SIGNAL;
1311 if (td2->td_dbgksi.ksi_signo != 0 &&
1312 #ifdef COMPAT_FREEBSD32
1313 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1314 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1315 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1316 pl_siginfo) + sizeof(struct siginfo32)))
1317 #else
1318 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1319 + sizeof(pl->pl_siginfo)
1320 #endif
1321 ){
1322 pl->pl_flags |= PL_FLAG_SI;
1323 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
1324 }
1325 }
1326 if (td2->td_dbgflags & TDB_SCE)
1327 pl->pl_flags |= PL_FLAG_SCE;
1328 else if (td2->td_dbgflags & TDB_SCX)
1329 pl->pl_flags |= PL_FLAG_SCX;
1330 if (td2->td_dbgflags & TDB_EXEC)
1331 pl->pl_flags |= PL_FLAG_EXEC;
1332 if (td2->td_dbgflags & TDB_FORK) {
1333 pl->pl_flags |= PL_FLAG_FORKED;
1334 pl->pl_child_pid = td2->td_dbg_forked;
1335 if (td2->td_dbgflags & TDB_VFORK)
1336 pl->pl_flags |= PL_FLAG_VFORKED;
1337 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1338 TDB_VFORK)
1339 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1340 if (td2->td_dbgflags & TDB_CHILD)
1341 pl->pl_flags |= PL_FLAG_CHILD;
1342 if (td2->td_dbgflags & TDB_BORN)
1343 pl->pl_flags |= PL_FLAG_BORN;
1344 if (td2->td_dbgflags & TDB_EXIT)
1345 pl->pl_flags |= PL_FLAG_EXITED;
1346 pl->pl_sigmask = td2->td_sigmask;
1347 pl->pl_siglist = td2->td_siglist;
1348 strcpy(pl->pl_tdname, td2->td_name);
1349 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1350 pl->pl_syscall_code = td2->td_dbg_sc_code;
1351 pl->pl_syscall_narg = td2->td_dbg_sc_narg;
1352 } else {
1353 pl->pl_syscall_code = 0;
1354 pl->pl_syscall_narg = 0;
1355 }
1356 #ifdef COMPAT_FREEBSD32
1357 if (wrap32)
1358 ptrace_lwpinfo_to32(pl, pl32);
1359 #endif
1360 CTR6(KTR_PTRACE,
1361 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1362 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1363 pl->pl_child_pid, pl->pl_syscall_code);
1364 break;
1365
1366 case PT_GETNUMLWPS:
1367 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1368 p->p_numthreads);
1369 td->td_retval[0] = p->p_numthreads;
1370 break;
1371
1372 case PT_GETLWPLIST:
1373 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1374 p->p_pid, data, p->p_numthreads);
1375 if (data <= 0) {
1376 error = EINVAL;
1377 break;
1378 }
1379 num = imin(p->p_numthreads, data);
1380 PROC_UNLOCK(p);
1381 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1382 tmp = 0;
1383 PROC_LOCK(p);
1384 FOREACH_THREAD_IN_PROC(p, td2) {
1385 if (tmp >= num)
1386 break;
1387 buf[tmp++] = td2->td_tid;
1388 }
1389 PROC_UNLOCK(p);
1390 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1391 free(buf, M_TEMP);
1392 if (!error)
1393 td->td_retval[0] = tmp;
1394 PROC_LOCK(p);
1395 break;
1396
1397 case PT_VM_TIMESTAMP:
1398 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1399 p->p_pid, p->p_vmspace->vm_map.timestamp);
1400 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1401 break;
1402
1403 case PT_VM_ENTRY:
1404 PROC_UNLOCK(p);
1405 #ifdef COMPAT_FREEBSD32
1406 if (wrap32)
1407 error = ptrace_vm_entry32(td, p, addr);
1408 else
1409 #endif
1410 error = ptrace_vm_entry(td, p, addr);
1411 PROC_LOCK(p);
1412 break;
1413
1414 default:
1415 #ifdef __HAVE_PTRACE_MACHDEP
1416 if (req >= PT_FIRSTMACH) {
1417 PROC_UNLOCK(p);
1418 error = cpu_ptrace(td2, req, addr, data);
1419 PROC_LOCK(p);
1420 } else
1421 #endif
1422 /* Unknown request. */
1423 error = EINVAL;
1424 break;
1425 }
1426
1427 out:
1428 /* Drop our hold on this process now that the request has completed. */
1429 _PRELE(p);
1430 fail:
1431 PROC_UNLOCK(p);
1432 if (proctree_locked)
1433 sx_xunlock(&proctree_lock);
1434 return (error);
1435 }
1436 #undef PROC_READ
1437 #undef PROC_WRITE
1438
1439 /*
1440 * Stop a process because of a debugging event;
1441 * stay stopped until p->p_step is cleared
1442 * (cleared by PIOCCONT in procfs).
1443 */
1444 void
1445 stopevent(struct proc *p, unsigned int event, unsigned int val)
1446 {
1447
1448 PROC_LOCK_ASSERT(p, MA_OWNED);
1449 p->p_step = 1;
1450 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1451 val);
1452 do {
1453 if (event != S_EXIT)
1454 p->p_xsig = val;
1455 p->p_xthread = NULL;
1456 p->p_stype = event; /* Which event caused the stop? */
1457 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1458 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1459 } while (p->p_step);
1460 }
Cache object: 6c2168bd777bd25c85ae3ac6378d30d9
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