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/sysproto.h>
43 #include <sys/proc.h>
44 #include <sys/vnode.h>
45 #include <sys/ptrace.h>
46 #include <sys/sx.h>
47 #include <sys/malloc.h>
48 #include <sys/signalvar.h>
49
50 #include <machine/reg.h>
51
52 #include <security/audit/audit.h>
53
54 #include <vm/vm.h>
55 #include <vm/pmap.h>
56 #include <vm/vm_extern.h>
57 #include <vm/vm_map.h>
58 #include <vm/vm_kern.h>
59 #include <vm/vm_object.h>
60 #include <vm/vm_page.h>
61
62 #ifdef COMPAT_IA32
63 #include <sys/procfs.h>
64 #include <machine/fpu.h>
65 #include <compat/ia32/ia32_reg.h>
66
67 extern struct sysentvec ia32_freebsd_sysvec;
68
69 struct ptrace_io_desc32 {
70 int piod_op;
71 u_int32_t piod_offs;
72 u_int32_t piod_addr;
73 u_int32_t piod_len;
74 };
75 #endif
76
77 /*
78 * Functions implemented using PROC_ACTION():
79 *
80 * proc_read_regs(proc, regs)
81 * Get the current user-visible register set from the process
82 * and copy it into the regs structure (<machine/reg.h>).
83 * The process is stopped at the time read_regs is called.
84 *
85 * proc_write_regs(proc, regs)
86 * Update the current register set from the passed in regs
87 * structure. Take care to avoid clobbering special CPU
88 * registers or privileged bits in the PSL.
89 * Depending on the architecture this may have fix-up work to do,
90 * especially if the IAR or PCW are modified.
91 * The process is stopped at the time write_regs is called.
92 *
93 * proc_read_fpregs, proc_write_fpregs
94 * deal with the floating point register set, otherwise as above.
95 *
96 * proc_read_dbregs, proc_write_dbregs
97 * deal with the processor debug register set, otherwise as above.
98 *
99 * proc_sstep(proc)
100 * Arrange for the process to trap after executing a single instruction.
101 */
102
103 #define PROC_ACTION(action) do { \
104 int error; \
105 \
106 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
107 if ((td->td_proc->p_flag & P_INMEM) == 0) \
108 error = EIO; \
109 else \
110 error = (action); \
111 return (error); \
112 } while(0)
113
114 int
115 proc_read_regs(struct thread *td, struct reg *regs)
116 {
117
118 PROC_ACTION(fill_regs(td, regs));
119 }
120
121 int
122 proc_write_regs(struct thread *td, struct reg *regs)
123 {
124
125 PROC_ACTION(set_regs(td, regs));
126 }
127
128 int
129 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
130 {
131
132 PROC_ACTION(fill_dbregs(td, dbregs));
133 }
134
135 int
136 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
137 {
138
139 PROC_ACTION(set_dbregs(td, dbregs));
140 }
141
142 /*
143 * Ptrace doesn't support fpregs at all, and there are no security holes
144 * or translations for fpregs, so we can just copy them.
145 */
146 int
147 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
148 {
149
150 PROC_ACTION(fill_fpregs(td, fpregs));
151 }
152
153 int
154 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
155 {
156
157 PROC_ACTION(set_fpregs(td, fpregs));
158 }
159
160 #ifdef COMPAT_IA32
161 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
162 int
163 proc_read_regs32(struct thread *td, struct reg32 *regs32)
164 {
165
166 PROC_ACTION(fill_regs32(td, regs32));
167 }
168
169 int
170 proc_write_regs32(struct thread *td, struct reg32 *regs32)
171 {
172
173 PROC_ACTION(set_regs32(td, regs32));
174 }
175
176 int
177 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
178 {
179
180 PROC_ACTION(fill_dbregs32(td, dbregs32));
181 }
182
183 int
184 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
185 {
186
187 PROC_ACTION(set_dbregs32(td, dbregs32));
188 }
189
190 int
191 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
192 {
193
194 PROC_ACTION(fill_fpregs32(td, fpregs32));
195 }
196
197 int
198 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
199 {
200
201 PROC_ACTION(set_fpregs32(td, fpregs32));
202 }
203 #endif
204
205 int
206 proc_sstep(struct thread *td)
207 {
208
209 PROC_ACTION(ptrace_single_step(td));
210 }
211
212 int
213 proc_rwmem(struct proc *p, struct uio *uio)
214 {
215 vm_map_t map;
216 vm_object_t backing_object, object = NULL;
217 vm_offset_t pageno = 0; /* page number */
218 vm_prot_t reqprot;
219 int error, fault_flags, writing;
220
221 /*
222 * Assert that someone has locked this vmspace. (Should be
223 * curthread but we can't assert that.) This keeps the process
224 * from exiting out from under us until this operation completes.
225 */
226 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
227 p, p->p_pid));
228
229 /*
230 * The map we want...
231 */
232 map = &p->p_vmspace->vm_map;
233
234 writing = uio->uio_rw == UIO_WRITE;
235 reqprot = writing ? (VM_PROT_WRITE | VM_PROT_OVERRIDE_WRITE) :
236 VM_PROT_READ;
237 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
238
239 /*
240 * Only map in one page at a time. We don't have to, but it
241 * makes things easier. This way is trivial - right?
242 */
243 do {
244 vm_map_t tmap;
245 vm_offset_t uva;
246 int page_offset; /* offset into page */
247 vm_map_entry_t out_entry;
248 vm_prot_t out_prot;
249 boolean_t wired;
250 vm_pindex_t pindex;
251 u_int len;
252 vm_page_t m;
253
254 object = NULL;
255
256 uva = (vm_offset_t)uio->uio_offset;
257
258 /*
259 * Get the page number of this segment.
260 */
261 pageno = trunc_page(uva);
262 page_offset = uva - pageno;
263
264 /*
265 * How many bytes to copy
266 */
267 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
268
269 /*
270 * Fault the page on behalf of the process
271 */
272 error = vm_fault(map, pageno, reqprot, fault_flags);
273 if (error) {
274 error = EFAULT;
275 break;
276 }
277
278 /*
279 * Now we need to get the page. out_entry, out_prot, wired,
280 * and single_use aren't used. One would think the vm code
281 * would be a *bit* nicer... We use tmap because
282 * vm_map_lookup() can change the map argument.
283 */
284 tmap = map;
285 error = vm_map_lookup(&tmap, pageno, reqprot, &out_entry,
286 &object, &pindex, &out_prot, &wired);
287 if (error) {
288 error = EFAULT;
289 break;
290 }
291 VM_OBJECT_LOCK(object);
292 while ((m = vm_page_lookup(object, pindex)) == NULL &&
293 !writing &&
294 (backing_object = object->backing_object) != NULL) {
295 /*
296 * Allow fallback to backing objects if we are reading.
297 */
298 VM_OBJECT_LOCK(backing_object);
299 pindex += OFF_TO_IDX(object->backing_object_offset);
300 VM_OBJECT_UNLOCK(object);
301 object = backing_object;
302 }
303 VM_OBJECT_UNLOCK(object);
304 if (m == NULL) {
305 vm_map_lookup_done(tmap, out_entry);
306 error = EFAULT;
307 break;
308 }
309
310 /*
311 * Hold the page in memory.
312 */
313 vm_page_lock_queues();
314 vm_page_hold(m);
315 vm_page_unlock_queues();
316
317 /*
318 * We're done with tmap now.
319 */
320 vm_map_lookup_done(tmap, out_entry);
321
322 /*
323 * Now do the i/o move.
324 */
325 error = uiomove_fromphys(&m, page_offset, len, uio);
326
327 /*
328 * Release the page.
329 */
330 vm_page_lock_queues();
331 vm_page_unhold(m);
332 vm_page_unlock_queues();
333
334 } while (error == 0 && uio->uio_resid > 0);
335
336 return (error);
337 }
338
339 /*
340 * Process debugging system call.
341 */
342 #ifndef _SYS_SYSPROTO_H_
343 struct ptrace_args {
344 int req;
345 pid_t pid;
346 caddr_t addr;
347 int data;
348 };
349 #endif
350
351 #ifdef COMPAT_IA32
352 /*
353 * This CPP subterfuge is to try and reduce the number of ifdefs in
354 * the body of the code.
355 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
356 * becomes either:
357 * copyin(uap->addr, &r.reg, sizeof r.reg);
358 * or
359 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
360 * .. except this is done at runtime.
361 */
362 #define COPYIN(u, k, s) wrap32 ? \
363 copyin(u, k ## 32, s ## 32) : \
364 copyin(u, k, s)
365 #define COPYOUT(k, u, s) wrap32 ? \
366 copyout(k ## 32, u, s ## 32) : \
367 copyout(k, u, s)
368 #else
369 #define COPYIN(u, k, s) copyin(u, k, s)
370 #define COPYOUT(k, u, s) copyout(k, u, s)
371 #endif
372 int
373 ptrace(struct thread *td, struct ptrace_args *uap)
374 {
375 /*
376 * XXX this obfuscation is to reduce stack usage, but the register
377 * structs may be too large to put on the stack anyway.
378 */
379 union {
380 struct ptrace_io_desc piod;
381 struct ptrace_lwpinfo pl;
382 struct dbreg dbreg;
383 struct fpreg fpreg;
384 struct reg reg;
385 #ifdef COMPAT_IA32
386 struct dbreg32 dbreg32;
387 struct fpreg32 fpreg32;
388 struct reg32 reg32;
389 struct ptrace_io_desc32 piod32;
390 #endif
391 } r;
392 void *addr;
393 int error = 0;
394 #ifdef COMPAT_IA32
395 int wrap32 = 0;
396
397 if (td->td_proc->p_sysent == &ia32_freebsd_sysvec)
398 wrap32 = 1;
399 #endif
400 AUDIT_ARG(pid, uap->pid);
401 AUDIT_ARG(cmd, uap->req);
402 AUDIT_ARG(addr, uap->addr);
403 AUDIT_ARG(value, uap->data);
404 addr = &r;
405 switch (uap->req) {
406 case PT_GETREGS:
407 case PT_GETFPREGS:
408 case PT_GETDBREGS:
409 case PT_LWPINFO:
410 break;
411 case PT_SETREGS:
412 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
413 break;
414 case PT_SETFPREGS:
415 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
416 break;
417 case PT_SETDBREGS:
418 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
419 break;
420 case PT_IO:
421 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
422 break;
423 default:
424 addr = uap->addr;
425 break;
426 }
427 if (error)
428 return (error);
429
430 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
431 if (error)
432 return (error);
433
434 switch (uap->req) {
435 case PT_IO:
436 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
437 break;
438 case PT_GETREGS:
439 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
440 break;
441 case PT_GETFPREGS:
442 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
443 break;
444 case PT_GETDBREGS:
445 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
446 break;
447 case PT_LWPINFO:
448 error = copyout(&r.pl, uap->addr, uap->data);
449 break;
450 }
451
452 return (error);
453 }
454 #undef COPYIN
455 #undef COPYOUT
456
457 #ifdef COMPAT_IA32
458 /*
459 * PROC_READ(regs, td2, addr);
460 * becomes either:
461 * proc_read_regs(td2, addr);
462 * or
463 * proc_read_regs32(td2, addr);
464 * .. except this is done at runtime. There is an additional
465 * complication in that PROC_WRITE disallows 32 bit consumers
466 * from writing to 64 bit address space targets.
467 */
468 #define PROC_READ(w, t, a) wrap32 ? \
469 proc_read_ ## w ## 32(t, a) : \
470 proc_read_ ## w (t, a)
471 #define PROC_WRITE(w, t, a) wrap32 ? \
472 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
473 proc_write_ ## w (t, a)
474 #else
475 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
476 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
477 #endif
478
479 int
480 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
481 {
482 struct iovec iov;
483 struct uio uio;
484 struct proc *curp, *p, *pp;
485 struct thread *td2 = NULL;
486 struct ptrace_io_desc *piod = NULL;
487 struct ptrace_lwpinfo *pl;
488 int error, write, tmp, num;
489 int proctree_locked = 0;
490 lwpid_t tid = 0, *buf;
491 #ifdef COMPAT_IA32
492 int wrap32 = 0, safe = 0;
493 struct ptrace_io_desc32 *piod32 = NULL;
494 #endif
495
496 curp = td->td_proc;
497
498 /* Lock proctree before locking the process. */
499 switch (req) {
500 case PT_TRACE_ME:
501 case PT_ATTACH:
502 case PT_STEP:
503 case PT_CONTINUE:
504 case PT_TO_SCE:
505 case PT_TO_SCX:
506 case PT_SYSCALL:
507 case PT_DETACH:
508 sx_xlock(&proctree_lock);
509 proctree_locked = 1;
510 break;
511 default:
512 break;
513 }
514
515 write = 0;
516 if (req == PT_TRACE_ME) {
517 p = td->td_proc;
518 PROC_LOCK(p);
519 } else {
520 if (pid <= PID_MAX) {
521 if ((p = pfind(pid)) == NULL) {
522 if (proctree_locked)
523 sx_xunlock(&proctree_lock);
524 return (ESRCH);
525 }
526 } else {
527 /* this is slow, should be optimized */
528 sx_slock(&allproc_lock);
529 FOREACH_PROC_IN_SYSTEM(p) {
530 PROC_LOCK(p);
531 PROC_SLOCK(p);
532 FOREACH_THREAD_IN_PROC(p, td2) {
533 if (td2->td_tid == pid)
534 break;
535 }
536 PROC_SUNLOCK(p);
537 if (td2 != NULL)
538 break; /* proc lock held */
539 PROC_UNLOCK(p);
540 }
541 sx_sunlock(&allproc_lock);
542 if (p == NULL) {
543 if (proctree_locked)
544 sx_xunlock(&proctree_lock);
545 return (ESRCH);
546 }
547 tid = pid;
548 pid = p->p_pid;
549 }
550 }
551 AUDIT_ARG(process, p);
552
553 if ((p->p_flag & P_WEXIT) != 0) {
554 error = ESRCH;
555 goto fail;
556 }
557 if ((error = p_cansee(td, p)) != 0)
558 goto fail;
559
560 if ((error = p_candebug(td, p)) != 0)
561 goto fail;
562
563 /*
564 * System processes can't be debugged.
565 */
566 if ((p->p_flag & P_SYSTEM) != 0) {
567 error = EINVAL;
568 goto fail;
569 }
570
571 if (tid == 0) {
572 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
573 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
574 td2 = p->p_xthread;
575 } else {
576 td2 = FIRST_THREAD_IN_PROC(p);
577 }
578 tid = td2->td_tid;
579 }
580
581 #ifdef COMPAT_IA32
582 /*
583 * Test if we're a 32 bit client and what the target is.
584 * Set the wrap controls accordingly.
585 */
586 if (td->td_proc->p_sysent == &ia32_freebsd_sysvec) {
587 if (td2->td_proc->p_sysent == &ia32_freebsd_sysvec)
588 safe = 1;
589 wrap32 = 1;
590 }
591 #endif
592 /*
593 * Permissions check
594 */
595 switch (req) {
596 case PT_TRACE_ME:
597 /* Always legal. */
598 break;
599
600 case PT_ATTACH:
601 /* Self */
602 if (p->p_pid == td->td_proc->p_pid) {
603 error = EINVAL;
604 goto fail;
605 }
606
607 /* Already traced */
608 if (p->p_flag & P_TRACED) {
609 error = EBUSY;
610 goto fail;
611 }
612
613 /* Can't trace an ancestor if you're being traced. */
614 if (curp->p_flag & P_TRACED) {
615 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
616 if (pp == p) {
617 error = EINVAL;
618 goto fail;
619 }
620 }
621 }
622
623
624 /* OK */
625 break;
626
627 case PT_CLEARSTEP:
628 /* Allow thread to clear single step for itself */
629 if (td->td_tid == tid)
630 break;
631
632 /* FALLTHROUGH */
633 default:
634 /* not being traced... */
635 if ((p->p_flag & P_TRACED) == 0) {
636 error = EPERM;
637 goto fail;
638 }
639
640 /* not being traced by YOU */
641 if (p->p_pptr != td->td_proc) {
642 error = EBUSY;
643 goto fail;
644 }
645
646 /* not currently stopped */
647 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
648 p->p_suspcount != p->p_numthreads ||
649 (p->p_flag & P_WAITED) == 0) {
650 error = EBUSY;
651 goto fail;
652 }
653
654 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
655 static int count = 0;
656 if (count++ == 0)
657 printf("P_STOPPED_TRACE not set.\n");
658 }
659
660 /* OK */
661 break;
662 }
663
664 /* Keep this process around until we finish this request. */
665 _PHOLD(p);
666
667 #ifdef FIX_SSTEP
668 /*
669 * Single step fixup ala procfs
670 */
671 FIX_SSTEP(td2);
672 #endif
673
674 /*
675 * Actually do the requests
676 */
677
678 td->td_retval[0] = 0;
679
680 switch (req) {
681 case PT_TRACE_ME:
682 /* set my trace flag and "owner" so it can read/write me */
683 p->p_flag |= P_TRACED;
684 p->p_oppid = p->p_pptr->p_pid;
685 break;
686
687 case PT_ATTACH:
688 /* security check done above */
689 p->p_flag |= P_TRACED;
690 p->p_oppid = p->p_pptr->p_pid;
691 if (p->p_pptr != td->td_proc)
692 proc_reparent(p, td->td_proc);
693 data = SIGSTOP;
694 goto sendsig; /* in PT_CONTINUE below */
695
696 case PT_CLEARSTEP:
697 error = ptrace_clear_single_step(td2);
698 break;
699
700 case PT_SETSTEP:
701 error = ptrace_single_step(td2);
702 break;
703
704 case PT_SUSPEND:
705 thread_lock(td2);
706 td2->td_flags |= TDF_DBSUSPEND;
707 thread_unlock(td2);
708 break;
709
710 case PT_RESUME:
711 thread_lock(td2);
712 td2->td_flags &= ~TDF_DBSUSPEND;
713 thread_unlock(td2);
714 break;
715
716 case PT_STEP:
717 case PT_CONTINUE:
718 case PT_TO_SCE:
719 case PT_TO_SCX:
720 case PT_SYSCALL:
721 case PT_DETACH:
722 /* Zero means do not send any signal */
723 if (data < 0 || data > _SIG_MAXSIG) {
724 error = EINVAL;
725 break;
726 }
727
728 switch (req) {
729 case PT_STEP:
730 error = ptrace_single_step(td2);
731 if (error)
732 goto out;
733 break;
734 case PT_TO_SCE:
735 p->p_stops |= S_PT_SCE;
736 break;
737 case PT_TO_SCX:
738 p->p_stops |= S_PT_SCX;
739 break;
740 case PT_SYSCALL:
741 p->p_stops |= S_PT_SCE | S_PT_SCX;
742 break;
743 }
744
745 if (addr != (void *)1) {
746 error = ptrace_set_pc(td2, (u_long)(uintfptr_t)addr);
747 if (error)
748 break;
749 }
750
751 if (req == PT_DETACH) {
752 /* reset process parent */
753 if (p->p_oppid != p->p_pptr->p_pid) {
754 struct proc *pp;
755
756 PROC_LOCK(p->p_pptr);
757 sigqueue_take(p->p_ksi);
758 PROC_UNLOCK(p->p_pptr);
759
760 PROC_UNLOCK(p);
761 pp = pfind(p->p_oppid);
762 if (pp == NULL)
763 pp = initproc;
764 else
765 PROC_UNLOCK(pp);
766 PROC_LOCK(p);
767 proc_reparent(p, pp);
768 if (pp == initproc)
769 p->p_sigparent = SIGCHLD;
770 }
771 p->p_flag &= ~(P_TRACED | P_WAITED);
772 p->p_oppid = 0;
773
774 /* should we send SIGCHLD? */
775 /* childproc_continued(p); */
776 }
777
778 sendsig:
779 if (proctree_locked) {
780 sx_xunlock(&proctree_lock);
781 proctree_locked = 0;
782 }
783 p->p_xstat = data;
784 p->p_xthread = NULL;
785 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
786 /* deliver or queue signal */
787 thread_lock(td2);
788 td2->td_flags &= ~TDF_XSIG;
789 thread_unlock(td2);
790 td2->td_xsig = data;
791
792 PROC_SLOCK(p);
793 if (req == PT_DETACH) {
794 struct thread *td3;
795 FOREACH_THREAD_IN_PROC(p, td3) {
796 thread_lock(td3);
797 td3->td_flags &= ~TDF_DBSUSPEND;
798 thread_unlock(td3);
799 }
800 }
801 /*
802 * unsuspend all threads, to not let a thread run,
803 * you should use PT_SUSPEND to suspend it before
804 * continuing process.
805 */
806 #ifdef KSE
807 PROC_SUNLOCK(p);
808 thread_continued(p);
809 PROC_SLOCK(p);
810 #endif
811 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
812 thread_unsuspend(p);
813 PROC_SUNLOCK(p);
814 } else {
815 if (data)
816 psignal(p, data);
817 }
818 break;
819
820 case PT_WRITE_I:
821 case PT_WRITE_D:
822 write = 1;
823 /* FALLTHROUGH */
824 case PT_READ_I:
825 case PT_READ_D:
826 PROC_UNLOCK(p);
827 tmp = 0;
828 /* write = 0 set above */
829 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
830 iov.iov_len = sizeof(int);
831 uio.uio_iov = &iov;
832 uio.uio_iovcnt = 1;
833 uio.uio_offset = (off_t)(uintptr_t)addr;
834 uio.uio_resid = sizeof(int);
835 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */
836 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
837 uio.uio_td = td;
838 error = proc_rwmem(p, &uio);
839 if (uio.uio_resid != 0) {
840 /*
841 * XXX proc_rwmem() doesn't currently return ENOSPC,
842 * so I think write() can bogusly return 0.
843 * XXX what happens for short writes? We don't want
844 * to write partial data.
845 * XXX proc_rwmem() returns EPERM for other invalid
846 * addresses. Convert this to EINVAL. Does this
847 * clobber returns of EPERM for other reasons?
848 */
849 if (error == 0 || error == ENOSPC || error == EPERM)
850 error = EINVAL; /* EOF */
851 }
852 if (!write)
853 td->td_retval[0] = tmp;
854 PROC_LOCK(p);
855 break;
856
857 case PT_IO:
858 #ifdef COMPAT_IA32
859 if (wrap32) {
860 piod32 = addr;
861 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
862 iov.iov_len = piod32->piod_len;
863 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
864 uio.uio_resid = piod32->piod_len;
865 } else
866 #endif
867 {
868 piod = addr;
869 iov.iov_base = piod->piod_addr;
870 iov.iov_len = piod->piod_len;
871 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
872 uio.uio_resid = piod->piod_len;
873 }
874 uio.uio_iov = &iov;
875 uio.uio_iovcnt = 1;
876 uio.uio_segflg = UIO_USERSPACE;
877 uio.uio_td = td;
878 #ifdef COMPAT_IA32
879 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
880 #else
881 tmp = piod->piod_op;
882 #endif
883 switch (tmp) {
884 case PIOD_READ_D:
885 case PIOD_READ_I:
886 uio.uio_rw = UIO_READ;
887 break;
888 case PIOD_WRITE_D:
889 case PIOD_WRITE_I:
890 uio.uio_rw = UIO_WRITE;
891 break;
892 default:
893 error = EINVAL;
894 goto out;
895 }
896 PROC_UNLOCK(p);
897 error = proc_rwmem(p, &uio);
898 #ifdef COMPAT_IA32
899 if (wrap32)
900 piod32->piod_len -= uio.uio_resid;
901 else
902 #endif
903 piod->piod_len -= uio.uio_resid;
904 PROC_LOCK(p);
905 break;
906
907 case PT_KILL:
908 data = SIGKILL;
909 goto sendsig; /* in PT_CONTINUE above */
910
911 case PT_SETREGS:
912 error = PROC_WRITE(regs, td2, addr);
913 break;
914
915 case PT_GETREGS:
916 error = PROC_READ(regs, td2, addr);
917 break;
918
919 case PT_SETFPREGS:
920 error = PROC_WRITE(fpregs, td2, addr);
921 break;
922
923 case PT_GETFPREGS:
924 error = PROC_READ(fpregs, td2, addr);
925 break;
926
927 case PT_SETDBREGS:
928 error = PROC_WRITE(dbregs, td2, addr);
929 break;
930
931 case PT_GETDBREGS:
932 error = PROC_READ(dbregs, td2, addr);
933 break;
934
935 case PT_LWPINFO:
936 if (data <= 0 || data > sizeof(*pl)) {
937 error = EINVAL;
938 break;
939 }
940 pl = addr;
941 pl->pl_lwpid = td2->td_tid;
942 if (td2->td_flags & TDF_XSIG)
943 pl->pl_event = PL_EVENT_SIGNAL;
944 else
945 pl->pl_event = 0;
946 #ifdef KSE
947 if (td2->td_pflags & TDP_SA) {
948 pl->pl_flags = PL_FLAG_SA;
949 if (td2->td_upcall && !TD_CAN_UNBIND(td2))
950 pl->pl_flags |= PL_FLAG_BOUND;
951 } else {
952 pl->pl_flags = 0;
953 }
954 #else
955 pl->pl_flags = 0;
956 #endif
957 pl->pl_sigmask = td2->td_sigmask;
958 pl->pl_siglist = td2->td_siglist;
959 break;
960
961 case PT_GETNUMLWPS:
962 td->td_retval[0] = p->p_numthreads;
963 break;
964
965 case PT_GETLWPLIST:
966 if (data <= 0) {
967 error = EINVAL;
968 break;
969 }
970 num = imin(p->p_numthreads, data);
971 PROC_UNLOCK(p);
972 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
973 tmp = 0;
974 PROC_LOCK(p);
975 PROC_SLOCK(p);
976 FOREACH_THREAD_IN_PROC(p, td2) {
977 if (tmp >= num)
978 break;
979 buf[tmp++] = td2->td_tid;
980 }
981 PROC_SUNLOCK(p);
982 PROC_UNLOCK(p);
983 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
984 free(buf, M_TEMP);
985 if (!error)
986 td->td_retval[0] = tmp;
987 PROC_LOCK(p);
988 break;
989
990 default:
991 #ifdef __HAVE_PTRACE_MACHDEP
992 if (req >= PT_FIRSTMACH) {
993 PROC_UNLOCK(p);
994 error = cpu_ptrace(td2, req, addr, data);
995 PROC_LOCK(p);
996 } else
997 #endif
998 /* Unknown request. */
999 error = EINVAL;
1000 break;
1001 }
1002
1003 out:
1004 /* Drop our hold on this process now that the request has completed. */
1005 _PRELE(p);
1006 fail:
1007 PROC_UNLOCK(p);
1008 if (proctree_locked)
1009 sx_xunlock(&proctree_lock);
1010 return (error);
1011 }
1012 #undef PROC_READ
1013 #undef PROC_WRITE
1014
1015 /*
1016 * Stop a process because of a debugging event;
1017 * stay stopped until p->p_step is cleared
1018 * (cleared by PIOCCONT in procfs).
1019 */
1020 void
1021 stopevent(struct proc *p, unsigned int event, unsigned int val)
1022 {
1023
1024 PROC_LOCK_ASSERT(p, MA_OWNED);
1025 p->p_step = 1;
1026 do {
1027 p->p_xstat = val;
1028 p->p_xthread = NULL;
1029 p->p_stype = event; /* Which event caused the stop? */
1030 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1031 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1032 } while (p->p_step);
1033 }
Cache object: 0cd943b0a140da226250cf42a7894f65
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