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