2 * SPDX-License-Identifier: BSD-4-Clause
4 * Copyright (c) 1994, Sean Eric Fagan
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by Sean Eric Fagan.
18 * 4. The name of the author may not be used to endorse or promote products
19 * derived from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/systm.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>
47 #include <sys/vnode.h>
48 #include <sys/ptrace.h>
49 #include <sys/rwlock.h>
51 #include <sys/malloc.h>
52 #include <sys/signalvar.h>
54 #include <machine/reg.h>
56 #include <security/audit/audit.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>
67 #ifdef COMPAT_FREEBSD32
68 #include <sys/procfs.h>
69 #include <compat/freebsd32/freebsd32_signal.h>
71 struct ptrace_io_desc32 {
78 struct ptrace_vm_entry32 {
93 * Functions implemented using PROC_ACTION():
95 * proc_read_regs(proc, regs)
96 * Get the current user-visible register set from the process
97 * and copy it into the regs structure (<machine/reg.h>).
98 * The process is stopped at the time read_regs is called.
100 * proc_write_regs(proc, regs)
101 * Update the current register set from the passed in regs
102 * structure. Take care to avoid clobbering special CPU
103 * registers or privileged bits in the PSL.
104 * Depending on the architecture this may have fix-up work to do,
105 * especially if the IAR or PCW are modified.
106 * The process is stopped at the time write_regs is called.
108 * proc_read_fpregs, proc_write_fpregs
109 * deal with the floating point register set, otherwise as above.
111 * proc_read_dbregs, proc_write_dbregs
112 * deal with the processor debug register set, otherwise as above.
115 * Arrange for the process to trap after executing a single instruction.
118 #define PROC_ACTION(action) do { \
121 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
122 if ((td->td_proc->p_flag & P_INMEM) == 0) \
130 proc_read_regs(struct thread *td, struct reg *regs)
133 PROC_ACTION(fill_regs(td, regs));
137 proc_write_regs(struct thread *td, struct reg *regs)
140 PROC_ACTION(set_regs(td, regs));
144 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
147 PROC_ACTION(fill_dbregs(td, dbregs));
151 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
154 PROC_ACTION(set_dbregs(td, dbregs));
158 * Ptrace doesn't support fpregs at all, and there are no security holes
159 * or translations for fpregs, so we can just copy them.
162 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
165 PROC_ACTION(fill_fpregs(td, fpregs));
169 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
172 PROC_ACTION(set_fpregs(td, fpregs));
175 #ifdef COMPAT_FREEBSD32
176 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
178 proc_read_regs32(struct thread *td, struct reg32 *regs32)
181 PROC_ACTION(fill_regs32(td, regs32));
185 proc_write_regs32(struct thread *td, struct reg32 *regs32)
188 PROC_ACTION(set_regs32(td, regs32));
192 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
195 PROC_ACTION(fill_dbregs32(td, dbregs32));
199 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
202 PROC_ACTION(set_dbregs32(td, dbregs32));
206 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
209 PROC_ACTION(fill_fpregs32(td, fpregs32));
213 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
216 PROC_ACTION(set_fpregs32(td, fpregs32));
221 proc_sstep(struct thread *td)
224 PROC_ACTION(ptrace_single_step(td));
228 proc_rwmem(struct proc *p, struct uio *uio)
231 vm_offset_t pageno; /* page number */
233 int error, fault_flags, page_offset, writing;
236 * Assert that someone has locked this vmspace. (Should be
237 * curthread but we can't assert that.) This keeps the process
238 * from exiting out from under us until this operation completes.
241 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
246 map = &p->p_vmspace->vm_map;
249 * If we are writing, then we request vm_fault() to create a private
250 * copy of each page. Since these copies will not be writeable by the
251 * process, we must explicity request that they be dirtied.
253 writing = uio->uio_rw == UIO_WRITE;
254 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
255 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
258 * Only map in one page at a time. We don't have to, but it
259 * makes things easier. This way is trivial - right?
266 uva = (vm_offset_t)uio->uio_offset;
269 * Get the page number of this segment.
271 pageno = trunc_page(uva);
272 page_offset = uva - pageno;
275 * How many bytes to copy
277 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
280 * Fault and hold the page on behalf of the process.
282 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
283 if (error != KERN_SUCCESS) {
284 if (error == KERN_RESOURCE_SHORTAGE)
292 * Now do the i/o move.
294 error = uiomove_fromphys(&m, page_offset, len, uio);
296 /* Make the I-cache coherent for breakpoints. */
297 if (writing && error == 0) {
298 vm_map_lock_read(map);
299 if (vm_map_check_protection(map, pageno, pageno +
300 PAGE_SIZE, VM_PROT_EXECUTE))
301 vm_sync_icache(map, uva, len);
302 vm_map_unlock_read(map);
312 } while (error == 0 && uio->uio_resid > 0);
318 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
319 size_t len, enum uio_rw rw)
325 MPASS(len < SSIZE_MAX);
328 iov.iov_base = (caddr_t)buf;
333 uio.uio_resid = slen;
334 uio.uio_segflg = UIO_SYSSPACE;
338 if (uio.uio_resid == slen)
340 return (slen - uio.uio_resid);
344 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
348 return (proc_iop(td, p, va, buf, len, UIO_READ));
352 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
356 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
360 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
364 vm_map_entry_t entry;
365 vm_object_t obj, tobj, lobj;
368 char *freepath, *fullpath;
375 vm = vmspace_acquire_ref(p);
377 vm_map_lock_read(map);
380 entry = map->header.next;
382 while (index < pve->pve_entry && entry != &map->header) {
386 if (index != pve->pve_entry) {
390 while (entry != &map->header &&
391 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
395 if (entry == &map->header) {
400 /* We got an entry. */
401 pve->pve_entry = index + 1;
402 pve->pve_timestamp = map->timestamp;
403 pve->pve_start = entry->start;
404 pve->pve_end = entry->end - 1;
405 pve->pve_offset = entry->offset;
406 pve->pve_prot = entry->protection;
408 /* Backing object's path needed? */
409 if (pve->pve_pathlen == 0)
412 pathlen = pve->pve_pathlen;
413 pve->pve_pathlen = 0;
415 obj = entry->object.vm_object;
417 VM_OBJECT_RLOCK(obj);
420 vm_map_unlock_read(map);
422 pve->pve_fsid = VNOVAL;
423 pve->pve_fileid = VNOVAL;
425 if (error == 0 && obj != NULL) {
427 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
429 VM_OBJECT_RLOCK(tobj);
431 VM_OBJECT_RUNLOCK(lobj);
433 pve->pve_offset += tobj->backing_object_offset;
435 vp = vm_object_vnode(lobj);
439 VM_OBJECT_RUNLOCK(lobj);
440 VM_OBJECT_RUNLOCK(obj);
445 vn_fullpath(td, vp, &fullpath, &freepath);
446 vn_lock(vp, LK_SHARED | LK_RETRY);
447 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
448 pve->pve_fileid = vattr.va_fileid;
449 pve->pve_fsid = vattr.va_fsid;
453 if (fullpath != NULL) {
454 pve->pve_pathlen = strlen(fullpath) + 1;
455 if (pve->pve_pathlen <= pathlen) {
456 error = copyout(fullpath, pve->pve_path,
459 error = ENAMETOOLONG;
461 if (freepath != NULL)
462 free(freepath, M_TEMP);
467 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
468 p->p_pid, pve->pve_entry, pve->pve_start);
473 #ifdef COMPAT_FREEBSD32
475 ptrace_vm_entry32(struct thread *td, struct proc *p,
476 struct ptrace_vm_entry32 *pve32)
478 struct ptrace_vm_entry pve;
481 pve.pve_entry = pve32->pve_entry;
482 pve.pve_pathlen = pve32->pve_pathlen;
483 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
485 error = ptrace_vm_entry(td, p, &pve);
487 pve32->pve_entry = pve.pve_entry;
488 pve32->pve_timestamp = pve.pve_timestamp;
489 pve32->pve_start = pve.pve_start;
490 pve32->pve_end = pve.pve_end;
491 pve32->pve_offset = pve.pve_offset;
492 pve32->pve_prot = pve.pve_prot;
493 pve32->pve_fileid = pve.pve_fileid;
494 pve32->pve_fsid = pve.pve_fsid;
497 pve32->pve_pathlen = pve.pve_pathlen;
502 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
503 struct ptrace_lwpinfo32 *pl32)
506 bzero(pl32, sizeof(*pl32));
507 pl32->pl_lwpid = pl->pl_lwpid;
508 pl32->pl_event = pl->pl_event;
509 pl32->pl_flags = pl->pl_flags;
510 pl32->pl_sigmask = pl->pl_sigmask;
511 pl32->pl_siglist = pl->pl_siglist;
512 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
513 strcpy(pl32->pl_tdname, pl->pl_tdname);
514 pl32->pl_child_pid = pl->pl_child_pid;
515 pl32->pl_syscall_code = pl->pl_syscall_code;
516 pl32->pl_syscall_narg = pl->pl_syscall_narg;
518 #endif /* COMPAT_FREEBSD32 */
521 * Process debugging system call.
523 #ifndef _SYS_SYSPROTO_H_
532 #ifdef COMPAT_FREEBSD32
534 * This CPP subterfuge is to try and reduce the number of ifdefs in
535 * the body of the code.
536 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
538 * copyin(uap->addr, &r.reg, sizeof r.reg);
540 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
541 * .. except this is done at runtime.
543 #define BZERO(a, s) wrap32 ? \
544 bzero(a ## 32, s ## 32) : \
546 #define COPYIN(u, k, s) wrap32 ? \
547 copyin(u, k ## 32, s ## 32) : \
549 #define COPYOUT(k, u, s) wrap32 ? \
550 copyout(k ## 32, u, s ## 32) : \
553 #define BZERO(a, s) bzero(a, s)
554 #define COPYIN(u, k, s) copyin(u, k, s)
555 #define COPYOUT(k, u, s) copyout(k, u, s)
558 sys_ptrace(struct thread *td, struct ptrace_args *uap)
561 * XXX this obfuscation is to reduce stack usage, but the register
562 * structs may be too large to put on the stack anyway.
565 struct ptrace_io_desc piod;
566 struct ptrace_lwpinfo pl;
567 struct ptrace_vm_entry pve;
571 #ifdef COMPAT_FREEBSD32
572 struct dbreg32 dbreg32;
573 struct fpreg32 fpreg32;
575 struct ptrace_io_desc32 piod32;
576 struct ptrace_lwpinfo32 pl32;
577 struct ptrace_vm_entry32 pve32;
579 char args[sizeof(td->td_sa.args)];
584 #ifdef COMPAT_FREEBSD32
587 if (SV_CURPROC_FLAG(SV_ILP32))
590 AUDIT_ARG_PID(uap->pid);
591 AUDIT_ARG_CMD(uap->req);
592 AUDIT_ARG_VALUE(uap->data);
595 case PT_GET_EVENT_MASK:
600 BZERO(&r.reg, sizeof r.reg);
603 BZERO(&r.fpreg, sizeof r.fpreg);
606 BZERO(&r.dbreg, sizeof r.dbreg);
609 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
612 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
615 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
617 case PT_SET_EVENT_MASK:
618 if (uap->data != sizeof(r.ptevents))
621 error = copyin(uap->addr, &r.ptevents, uap->data);
624 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
627 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
636 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
642 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
645 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
648 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
651 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
654 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
656 case PT_GET_EVENT_MASK:
657 /* NB: The size in uap->data is validated in kern_ptrace(). */
658 error = copyout(&r.ptevents, uap->addr, uap->data);
661 /* NB: The size in uap->data is validated in kern_ptrace(). */
662 error = copyout(&r.pl, uap->addr, uap->data);
665 error = copyout(r.args, uap->addr, MIN(uap->data,
676 #ifdef COMPAT_FREEBSD32
678 * PROC_READ(regs, td2, addr);
680 * proc_read_regs(td2, addr);
682 * proc_read_regs32(td2, addr);
683 * .. except this is done at runtime. There is an additional
684 * complication in that PROC_WRITE disallows 32 bit consumers
685 * from writing to 64 bit address space targets.
687 #define PROC_READ(w, t, a) wrap32 ? \
688 proc_read_ ## w ## 32(t, a) : \
689 proc_read_ ## w (t, a)
690 #define PROC_WRITE(w, t, a) wrap32 ? \
691 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
692 proc_write_ ## w (t, a)
694 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
695 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
699 proc_set_traced(struct proc *p, bool stop)
702 sx_assert(&proctree_lock, SX_XLOCKED);
703 PROC_LOCK_ASSERT(p, MA_OWNED);
704 p->p_flag |= P_TRACED;
706 p->p_flag2 |= P2_PTRACE_FSTP;
707 p->p_ptevents = PTRACE_DEFAULT;
708 p->p_oppid = p->p_pptr->p_pid;
712 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
716 struct proc *curp, *p, *pp;
717 struct thread *td2 = NULL, *td3;
718 struct ptrace_io_desc *piod = NULL;
719 struct ptrace_lwpinfo *pl;
721 int proctree_locked = 0;
722 lwpid_t tid = 0, *buf;
723 #ifdef COMPAT_FREEBSD32
724 int wrap32 = 0, safe = 0;
725 struct ptrace_io_desc32 *piod32 = NULL;
726 struct ptrace_lwpinfo32 *pl32 = NULL;
727 struct ptrace_lwpinfo plr;
732 /* Lock proctree before locking the process. */
743 case PT_GET_EVENT_MASK:
744 case PT_SET_EVENT_MASK:
747 sx_xlock(&proctree_lock);
754 if (req == PT_TRACE_ME) {
758 if (pid <= PID_MAX) {
759 if ((p = pfind(pid)) == NULL) {
761 sx_xunlock(&proctree_lock);
765 td2 = tdfind(pid, -1);
768 sx_xunlock(&proctree_lock);
776 AUDIT_ARG_PROCESS(p);
778 if ((p->p_flag & P_WEXIT) != 0) {
782 if ((error = p_cansee(td, p)) != 0)
785 if ((error = p_candebug(td, p)) != 0)
789 * System processes can't be debugged.
791 if ((p->p_flag & P_SYSTEM) != 0) {
797 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
798 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
801 td2 = FIRST_THREAD_IN_PROC(p);
806 #ifdef COMPAT_FREEBSD32
808 * Test if we're a 32 bit client and what the target is.
809 * Set the wrap controls accordingly.
811 if (SV_CURPROC_FLAG(SV_ILP32)) {
812 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
823 * Always legal, when there is a parent process which
824 * could trace us. Otherwise, reject.
826 if ((p->p_flag & P_TRACED) != 0) {
830 if (p->p_pptr == initproc) {
838 if (p == td->td_proc) {
844 if (p->p_flag & P_TRACED) {
849 /* Can't trace an ancestor if you're being traced. */
850 if (curp->p_flag & P_TRACED) {
851 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
864 /* Allow thread to clear single step for itself */
865 if (td->td_tid == tid)
870 /* not being traced... */
871 if ((p->p_flag & P_TRACED) == 0) {
876 /* not being traced by YOU */
877 if (p->p_pptr != td->td_proc) {
882 /* not currently stopped */
883 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
884 p->p_suspcount != p->p_numthreads ||
885 (p->p_flag & P_WAITED) == 0) {
894 /* Keep this process around until we finish this request. */
899 * Single step fixup ala procfs
905 * Actually do the requests
908 td->td_retval[0] = 0;
912 /* set my trace flag and "owner" so it can read/write me */
913 proc_set_traced(p, false);
914 if (p->p_flag & P_PPWAIT)
915 p->p_flag |= P_PPTRACE;
916 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
920 /* security check done above */
922 * It would be nice if the tracing relationship was separate
923 * from the parent relationship but that would require
924 * another set of links in the proc struct or for "wait"
925 * to scan the entire proc table. To make life easier,
926 * we just re-parent the process we're trying to trace.
927 * The old parent is remembered so we can put things back
930 proc_set_traced(p, true);
931 if (p->p_pptr != td->td_proc) {
932 proc_reparent(p, td->td_proc);
934 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
937 sx_xunlock(&proctree_lock);
939 MPASS(p->p_xthread == NULL);
940 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
943 * If already stopped due to a stop signal, clear the
944 * existing stop before triggering a traced SIGSTOP.
946 if ((p->p_flag & P_STOPPED_SIG) != 0) {
948 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
953 kern_psignal(p, SIGSTOP);
957 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
959 error = ptrace_clear_single_step(td2);
963 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
965 error = ptrace_single_step(td2);
969 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
971 td2->td_dbgflags |= TDB_SUSPEND;
973 td2->td_flags |= TDF_NEEDSUSPCHK;
978 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
980 td2->td_dbgflags &= ~TDB_SUSPEND;
984 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
985 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
986 data ? "enabled" : "disabled");
988 p->p_ptevents |= PTRACE_FORK;
990 p->p_ptevents &= ~PTRACE_FORK;
994 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
995 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
996 data ? "enabled" : "disabled");
998 p->p_ptevents |= PTRACE_LWP;
1000 p->p_ptevents &= ~PTRACE_LWP;
1003 case PT_GET_EVENT_MASK:
1004 if (data != sizeof(p->p_ptevents)) {
1008 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
1010 *(int *)addr = p->p_ptevents;
1013 case PT_SET_EVENT_MASK:
1014 if (data != sizeof(p->p_ptevents)) {
1019 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1020 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
1024 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1025 p->p_pid, p->p_ptevents, tmp);
1026 p->p_ptevents = tmp;
1029 case PT_GET_SC_ARGS:
1030 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
1031 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
1032 #ifdef COMPAT_FREEBSD32
1033 || (wrap32 && !safe)
1039 bzero(addr, sizeof(td2->td_sa.args));
1040 #ifdef COMPAT_FREEBSD32
1042 for (num = 0; num < nitems(td2->td_sa.args); num++)
1043 ((uint32_t *)addr)[num] = (uint32_t)
1044 td2->td_sa.args[num];
1047 bcopy(td2->td_sa.args, addr, td2->td_sa.narg *
1048 sizeof(register_t));
1057 /* Zero means do not send any signal */
1058 if (data < 0 || data > _SIG_MAXSIG) {
1065 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
1066 td2->td_tid, p->p_pid, data);
1067 error = ptrace_single_step(td2);
1075 if (addr != (void *)1) {
1076 error = ptrace_set_pc(td2,
1077 (u_long)(uintfptr_t)addr);
1083 p->p_ptevents |= PTRACE_SCE;
1085 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1086 p->p_pid, p->p_ptevents,
1087 (u_long)(uintfptr_t)addr, data);
1090 p->p_ptevents |= PTRACE_SCX;
1092 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1093 p->p_pid, p->p_ptevents,
1094 (u_long)(uintfptr_t)addr, data);
1097 p->p_ptevents |= PTRACE_SYSCALL;
1099 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1100 p->p_pid, p->p_ptevents,
1101 (u_long)(uintfptr_t)addr, data);
1105 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1106 p->p_pid, (u_long)(uintfptr_t)addr, data);
1112 * Reset the process parent.
1114 * NB: This clears P_TRACED before reparenting
1115 * a detached process back to its original
1116 * parent. Otherwise the debugee will be set
1117 * as an orphan of the debugger.
1119 p->p_flag &= ~(P_TRACED | P_WAITED);
1120 if (p->p_oppid != p->p_pptr->p_pid) {
1121 PROC_LOCK(p->p_pptr);
1122 sigqueue_take(p->p_ksi);
1123 PROC_UNLOCK(p->p_pptr);
1125 pp = proc_realparent(p);
1126 proc_reparent(p, pp);
1128 p->p_sigparent = SIGCHLD;
1130 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1131 p->p_pid, pp->p_pid, data);
1133 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1137 FOREACH_THREAD_IN_PROC(p, td3) {
1138 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1139 sigqueue_delete(&td3->td_sigqueue,
1142 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
1146 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1147 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1148 p->p_flag2 &= ~P2_PTRACE_FSTP;
1151 /* should we send SIGCHLD? */
1152 /* childproc_continued(p); */
1156 sx_xunlock(&proctree_lock);
1157 proctree_locked = 0;
1160 MPASS(proctree_locked == 0);
1163 * Clear the pending event for the thread that just
1164 * reported its event (p_xthread). This may not be
1165 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1166 * the debugger is resuming a different thread.
1168 * Deliver any pending signal via the reporting thread.
1170 MPASS(p->p_xthread != NULL);
1171 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
1172 p->p_xthread->td_xsig = data;
1173 p->p_xthread = NULL;
1177 * P_WKILLED is insurance that a PT_KILL/SIGKILL
1178 * always works immediately, even if another thread is
1179 * unsuspended first and attempts to handle a
1180 * different signal or if the POSIX.1b style signal
1181 * queue cannot accommodate any new signals.
1183 if (data == SIGKILL)
1187 * Unsuspend all threads. To leave a thread
1188 * suspended, use PT_SUSPEND to suspend it before
1189 * continuing the process.
1192 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
1193 thread_unsuspend(p);
1199 td2->td_dbgflags |= TDB_USERWR;
1202 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1203 sizeof(int)) != sizeof(int))
1206 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1207 p->p_pid, addr, data);
1215 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1216 sizeof(int)) != sizeof(int))
1219 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1220 p->p_pid, addr, tmp);
1221 td->td_retval[0] = tmp;
1226 #ifdef COMPAT_FREEBSD32
1229 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1230 iov.iov_len = piod32->piod_len;
1231 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1232 uio.uio_resid = piod32->piod_len;
1237 iov.iov_base = piod->piod_addr;
1238 iov.iov_len = piod->piod_len;
1239 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1240 uio.uio_resid = piod->piod_len;
1244 uio.uio_segflg = UIO_USERSPACE;
1246 #ifdef COMPAT_FREEBSD32
1247 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1249 tmp = piod->piod_op;
1254 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1255 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1256 uio.uio_rw = UIO_READ;
1260 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1261 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1262 td2->td_dbgflags |= TDB_USERWR;
1263 uio.uio_rw = UIO_WRITE;
1270 error = proc_rwmem(p, &uio);
1271 #ifdef COMPAT_FREEBSD32
1273 piod32->piod_len -= uio.uio_resid;
1276 piod->piod_len -= uio.uio_resid;
1281 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1283 goto sendsig; /* in PT_CONTINUE above */
1286 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1288 td2->td_dbgflags |= TDB_USERWR;
1289 error = PROC_WRITE(regs, td2, addr);
1293 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1295 error = PROC_READ(regs, td2, addr);
1299 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1301 td2->td_dbgflags |= TDB_USERWR;
1302 error = PROC_WRITE(fpregs, td2, addr);
1306 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1308 error = PROC_READ(fpregs, td2, addr);
1312 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1314 td2->td_dbgflags |= TDB_USERWR;
1315 error = PROC_WRITE(dbregs, td2, addr);
1319 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1321 error = PROC_READ(dbregs, td2, addr);
1326 #ifdef COMPAT_FREEBSD32
1327 (!wrap32 && data > sizeof(*pl)) ||
1328 (wrap32 && data > sizeof(*pl32))) {
1330 data > sizeof(*pl)) {
1335 #ifdef COMPAT_FREEBSD32
1342 bzero(pl, sizeof(*pl));
1343 pl->pl_lwpid = td2->td_tid;
1344 pl->pl_event = PL_EVENT_NONE;
1346 if (td2->td_dbgflags & TDB_XSIG) {
1347 pl->pl_event = PL_EVENT_SIGNAL;
1348 if (td2->td_si.si_signo != 0 &&
1349 #ifdef COMPAT_FREEBSD32
1350 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1351 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1352 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1353 pl_siginfo) + sizeof(struct siginfo32)))
1355 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1356 + sizeof(pl->pl_siginfo)
1359 pl->pl_flags |= PL_FLAG_SI;
1360 pl->pl_siginfo = td2->td_si;
1363 if (td2->td_dbgflags & TDB_SCE)
1364 pl->pl_flags |= PL_FLAG_SCE;
1365 else if (td2->td_dbgflags & TDB_SCX)
1366 pl->pl_flags |= PL_FLAG_SCX;
1367 if (td2->td_dbgflags & TDB_EXEC)
1368 pl->pl_flags |= PL_FLAG_EXEC;
1369 if (td2->td_dbgflags & TDB_FORK) {
1370 pl->pl_flags |= PL_FLAG_FORKED;
1371 pl->pl_child_pid = td2->td_dbg_forked;
1372 if (td2->td_dbgflags & TDB_VFORK)
1373 pl->pl_flags |= PL_FLAG_VFORKED;
1374 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1376 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1377 if (td2->td_dbgflags & TDB_CHILD)
1378 pl->pl_flags |= PL_FLAG_CHILD;
1379 if (td2->td_dbgflags & TDB_BORN)
1380 pl->pl_flags |= PL_FLAG_BORN;
1381 if (td2->td_dbgflags & TDB_EXIT)
1382 pl->pl_flags |= PL_FLAG_EXITED;
1383 pl->pl_sigmask = td2->td_sigmask;
1384 pl->pl_siglist = td2->td_siglist;
1385 strcpy(pl->pl_tdname, td2->td_name);
1386 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1387 pl->pl_syscall_code = td2->td_sa.code;
1388 pl->pl_syscall_narg = td2->td_sa.narg;
1390 pl->pl_syscall_code = 0;
1391 pl->pl_syscall_narg = 0;
1393 #ifdef COMPAT_FREEBSD32
1395 ptrace_lwpinfo_to32(pl, pl32);
1398 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1399 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1400 pl->pl_child_pid, pl->pl_syscall_code);
1404 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1406 td->td_retval[0] = p->p_numthreads;
1410 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1411 p->p_pid, data, p->p_numthreads);
1416 num = imin(p->p_numthreads, data);
1418 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1421 FOREACH_THREAD_IN_PROC(p, td2) {
1424 buf[tmp++] = td2->td_tid;
1427 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1430 td->td_retval[0] = tmp;
1434 case PT_VM_TIMESTAMP:
1435 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1436 p->p_pid, p->p_vmspace->vm_map.timestamp);
1437 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1442 #ifdef COMPAT_FREEBSD32
1444 error = ptrace_vm_entry32(td, p, addr);
1447 error = ptrace_vm_entry(td, p, addr);
1452 #ifdef __HAVE_PTRACE_MACHDEP
1453 if (req >= PT_FIRSTMACH) {
1455 error = cpu_ptrace(td2, req, addr, data);
1459 /* Unknown request. */
1465 /* Drop our hold on this process now that the request has completed. */
1469 if (proctree_locked)
1470 sx_xunlock(&proctree_lock);
1477 * Stop a process because of a debugging event;
1478 * stay stopped until p->p_step is cleared
1479 * (cleared by PIOCCONT in procfs).
1482 stopevent(struct proc *p, unsigned int event, unsigned int val)
1485 PROC_LOCK_ASSERT(p, MA_OWNED);
1487 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1490 if (event != S_EXIT)
1492 p->p_xthread = NULL;
1493 p->p_stype = event; /* Which event caused the stop? */
1494 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1495 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1496 } while (p->p_step);