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>
39 #include <sys/limits.h>
41 #include <sys/mutex.h>
42 #include <sys/syscallsubr.h>
43 #include <sys/sysent.h>
44 #include <sys/sysproto.h>
45 #include <sys/pioctl.h>
48 #include <sys/vnode.h>
49 #include <sys/ptrace.h>
50 #include <sys/rwlock.h>
52 #include <sys/malloc.h>
53 #include <sys/signalvar.h>
55 #include <machine/reg.h>
57 #include <security/audit/audit.h>
61 #include <vm/vm_extern.h>
62 #include <vm/vm_map.h>
63 #include <vm/vm_kern.h>
64 #include <vm/vm_object.h>
65 #include <vm/vm_page.h>
66 #include <vm/vm_param.h>
68 #ifdef COMPAT_FREEBSD32
69 #include <sys/procfs.h>
70 #include <compat/freebsd32/freebsd32_signal.h>
72 struct ptrace_io_desc32 {
79 struct ptrace_sc_ret32 {
80 uint32_t sr_retval[2];
84 struct ptrace_vm_entry32 {
99 * Functions implemented using PROC_ACTION():
101 * proc_read_regs(proc, regs)
102 * Get the current user-visible register set from the process
103 * and copy it into the regs structure (<machine/reg.h>).
104 * The process is stopped at the time read_regs is called.
106 * proc_write_regs(proc, regs)
107 * Update the current register set from the passed in regs
108 * structure. Take care to avoid clobbering special CPU
109 * registers or privileged bits in the PSL.
110 * Depending on the architecture this may have fix-up work to do,
111 * especially if the IAR or PCW are modified.
112 * The process is stopped at the time write_regs is called.
114 * proc_read_fpregs, proc_write_fpregs
115 * deal with the floating point register set, otherwise as above.
117 * proc_read_dbregs, proc_write_dbregs
118 * deal with the processor debug register set, otherwise as above.
121 * Arrange for the process to trap after executing a single instruction.
124 #define PROC_ACTION(action) do { \
127 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
128 if ((td->td_proc->p_flag & P_INMEM) == 0) \
136 proc_read_regs(struct thread *td, struct reg *regs)
139 PROC_ACTION(fill_regs(td, regs));
143 proc_write_regs(struct thread *td, struct reg *regs)
146 PROC_ACTION(set_regs(td, regs));
150 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
153 PROC_ACTION(fill_dbregs(td, dbregs));
157 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
160 PROC_ACTION(set_dbregs(td, dbregs));
164 * Ptrace doesn't support fpregs at all, and there are no security holes
165 * or translations for fpregs, so we can just copy them.
168 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
171 PROC_ACTION(fill_fpregs(td, fpregs));
175 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
178 PROC_ACTION(set_fpregs(td, fpregs));
181 #ifdef COMPAT_FREEBSD32
182 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
184 proc_read_regs32(struct thread *td, struct reg32 *regs32)
187 PROC_ACTION(fill_regs32(td, regs32));
191 proc_write_regs32(struct thread *td, struct reg32 *regs32)
194 PROC_ACTION(set_regs32(td, regs32));
198 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
201 PROC_ACTION(fill_dbregs32(td, dbregs32));
205 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
208 PROC_ACTION(set_dbregs32(td, dbregs32));
212 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
215 PROC_ACTION(fill_fpregs32(td, fpregs32));
219 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
222 PROC_ACTION(set_fpregs32(td, fpregs32));
227 proc_sstep(struct thread *td)
230 PROC_ACTION(ptrace_single_step(td));
234 proc_rwmem(struct proc *p, struct uio *uio)
237 vm_offset_t pageno; /* page number */
239 int error, fault_flags, page_offset, writing;
242 * Assert that someone has locked this vmspace. (Should be
243 * curthread but we can't assert that.) This keeps the process
244 * from exiting out from under us until this operation completes.
247 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
252 map = &p->p_vmspace->vm_map;
255 * If we are writing, then we request vm_fault() to create a private
256 * copy of each page. Since these copies will not be writeable by the
257 * process, we must explicity request that they be dirtied.
259 writing = uio->uio_rw == UIO_WRITE;
260 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
261 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
264 * Only map in one page at a time. We don't have to, but it
265 * makes things easier. This way is trivial - right?
272 uva = (vm_offset_t)uio->uio_offset;
275 * Get the page number of this segment.
277 pageno = trunc_page(uva);
278 page_offset = uva - pageno;
281 * How many bytes to copy
283 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
286 * Fault and hold the page on behalf of the process.
288 error = vm_fault(map, pageno, reqprot, fault_flags, &m);
289 if (error != KERN_SUCCESS) {
290 if (error == KERN_RESOURCE_SHORTAGE)
298 * Now do the i/o move.
300 error = uiomove_fromphys(&m, page_offset, len, uio);
302 /* Make the I-cache coherent for breakpoints. */
303 if (writing && error == 0) {
304 vm_map_lock_read(map);
305 if (vm_map_check_protection(map, pageno, pageno +
306 PAGE_SIZE, VM_PROT_EXECUTE))
307 vm_sync_icache(map, uva, len);
308 vm_map_unlock_read(map);
318 } while (error == 0 && uio->uio_resid > 0);
324 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
325 size_t len, enum uio_rw rw)
331 MPASS(len < SSIZE_MAX);
334 iov.iov_base = (caddr_t)buf;
339 uio.uio_resid = slen;
340 uio.uio_segflg = UIO_SYSSPACE;
344 if (uio.uio_resid == slen)
346 return (slen - uio.uio_resid);
350 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
354 return (proc_iop(td, p, va, buf, len, UIO_READ));
358 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
362 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
366 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
370 vm_map_entry_t entry;
371 vm_object_t obj, tobj, lobj;
374 char *freepath, *fullpath;
381 vm = vmspace_acquire_ref(p);
383 vm_map_lock_read(map);
386 entry = map->header.next;
388 while (index < pve->pve_entry && entry != &map->header) {
392 if (index != pve->pve_entry) {
396 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0,
397 ("Submap in map header"));
398 while ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
402 if (entry == &map->header) {
407 /* We got an entry. */
408 pve->pve_entry = index + 1;
409 pve->pve_timestamp = map->timestamp;
410 pve->pve_start = entry->start;
411 pve->pve_end = entry->end - 1;
412 pve->pve_offset = entry->offset;
413 pve->pve_prot = entry->protection;
415 /* Backing object's path needed? */
416 if (pve->pve_pathlen == 0)
419 pathlen = pve->pve_pathlen;
420 pve->pve_pathlen = 0;
422 obj = entry->object.vm_object;
424 VM_OBJECT_RLOCK(obj);
427 vm_map_unlock_read(map);
429 pve->pve_fsid = VNOVAL;
430 pve->pve_fileid = VNOVAL;
432 if (error == 0 && obj != NULL) {
434 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
436 VM_OBJECT_RLOCK(tobj);
438 VM_OBJECT_RUNLOCK(lobj);
440 pve->pve_offset += tobj->backing_object_offset;
442 vp = vm_object_vnode(lobj);
446 VM_OBJECT_RUNLOCK(lobj);
447 VM_OBJECT_RUNLOCK(obj);
452 vn_fullpath(td, vp, &fullpath, &freepath);
453 vn_lock(vp, LK_SHARED | LK_RETRY);
454 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
455 pve->pve_fileid = vattr.va_fileid;
456 pve->pve_fsid = vattr.va_fsid;
460 if (fullpath != NULL) {
461 pve->pve_pathlen = strlen(fullpath) + 1;
462 if (pve->pve_pathlen <= pathlen) {
463 error = copyout(fullpath, pve->pve_path,
466 error = ENAMETOOLONG;
468 if (freepath != NULL)
469 free(freepath, M_TEMP);
474 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
475 p->p_pid, pve->pve_entry, pve->pve_start);
480 #ifdef COMPAT_FREEBSD32
482 ptrace_vm_entry32(struct thread *td, struct proc *p,
483 struct ptrace_vm_entry32 *pve32)
485 struct ptrace_vm_entry pve;
488 pve.pve_entry = pve32->pve_entry;
489 pve.pve_pathlen = pve32->pve_pathlen;
490 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
492 error = ptrace_vm_entry(td, p, &pve);
494 pve32->pve_entry = pve.pve_entry;
495 pve32->pve_timestamp = pve.pve_timestamp;
496 pve32->pve_start = pve.pve_start;
497 pve32->pve_end = pve.pve_end;
498 pve32->pve_offset = pve.pve_offset;
499 pve32->pve_prot = pve.pve_prot;
500 pve32->pve_fileid = pve.pve_fileid;
501 pve32->pve_fsid = pve.pve_fsid;
504 pve32->pve_pathlen = pve.pve_pathlen;
509 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
510 struct ptrace_lwpinfo32 *pl32)
513 bzero(pl32, sizeof(*pl32));
514 pl32->pl_lwpid = pl->pl_lwpid;
515 pl32->pl_event = pl->pl_event;
516 pl32->pl_flags = pl->pl_flags;
517 pl32->pl_sigmask = pl->pl_sigmask;
518 pl32->pl_siglist = pl->pl_siglist;
519 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
520 strcpy(pl32->pl_tdname, pl->pl_tdname);
521 pl32->pl_child_pid = pl->pl_child_pid;
522 pl32->pl_syscall_code = pl->pl_syscall_code;
523 pl32->pl_syscall_narg = pl->pl_syscall_narg;
527 ptrace_sc_ret_to32(const struct ptrace_sc_ret *psr,
528 struct ptrace_sc_ret32 *psr32)
531 bzero(psr32, sizeof(*psr32));
532 psr32->sr_retval[0] = psr->sr_retval[0];
533 psr32->sr_retval[1] = psr->sr_retval[1];
534 psr32->sr_error = psr->sr_error;
536 #endif /* COMPAT_FREEBSD32 */
539 * Process debugging system call.
541 #ifndef _SYS_SYSPROTO_H_
550 #ifdef COMPAT_FREEBSD32
552 * This CPP subterfuge is to try and reduce the number of ifdefs in
553 * the body of the code.
554 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
556 * copyin(uap->addr, &r.reg, sizeof r.reg);
558 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
559 * .. except this is done at runtime.
561 #define BZERO(a, s) wrap32 ? \
562 bzero(a ## 32, s ## 32) : \
564 #define COPYIN(u, k, s) wrap32 ? \
565 copyin(u, k ## 32, s ## 32) : \
567 #define COPYOUT(k, u, s) wrap32 ? \
568 copyout(k ## 32, u, s ## 32) : \
571 #define BZERO(a, s) bzero(a, s)
572 #define COPYIN(u, k, s) copyin(u, k, s)
573 #define COPYOUT(k, u, s) copyout(k, u, s)
576 sys_ptrace(struct thread *td, struct ptrace_args *uap)
579 * XXX this obfuscation is to reduce stack usage, but the register
580 * structs may be too large to put on the stack anyway.
583 struct ptrace_io_desc piod;
584 struct ptrace_lwpinfo pl;
585 struct ptrace_vm_entry pve;
589 #ifdef COMPAT_FREEBSD32
590 struct dbreg32 dbreg32;
591 struct fpreg32 fpreg32;
593 struct ptrace_io_desc32 piod32;
594 struct ptrace_lwpinfo32 pl32;
595 struct ptrace_vm_entry32 pve32;
597 char args[sizeof(td->td_sa.args)];
598 struct ptrace_sc_ret psr;
603 #ifdef COMPAT_FREEBSD32
606 if (SV_CURPROC_FLAG(SV_ILP32))
609 AUDIT_ARG_PID(uap->pid);
610 AUDIT_ARG_CMD(uap->req);
611 AUDIT_ARG_VALUE(uap->data);
614 case PT_GET_EVENT_MASK:
620 BZERO(&r.reg, sizeof r.reg);
623 BZERO(&r.fpreg, sizeof r.fpreg);
626 BZERO(&r.dbreg, sizeof r.dbreg);
629 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
632 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
635 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
637 case PT_SET_EVENT_MASK:
638 if (uap->data != sizeof(r.ptevents))
641 error = copyin(uap->addr, &r.ptevents, uap->data);
644 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
647 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
656 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
662 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
665 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
668 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
671 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
674 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
676 case PT_GET_EVENT_MASK:
677 /* NB: The size in uap->data is validated in kern_ptrace(). */
678 error = copyout(&r.ptevents, uap->addr, uap->data);
681 /* NB: The size in uap->data is validated in kern_ptrace(). */
682 error = copyout(&r.pl, uap->addr, uap->data);
685 error = copyout(r.args, uap->addr, MIN(uap->data,
689 error = copyout(&r.psr, uap->addr, MIN(uap->data,
700 #ifdef COMPAT_FREEBSD32
702 * PROC_READ(regs, td2, addr);
704 * proc_read_regs(td2, addr);
706 * proc_read_regs32(td2, addr);
707 * .. except this is done at runtime. There is an additional
708 * complication in that PROC_WRITE disallows 32 bit consumers
709 * from writing to 64 bit address space targets.
711 #define PROC_READ(w, t, a) wrap32 ? \
712 proc_read_ ## w ## 32(t, a) : \
713 proc_read_ ## w (t, a)
714 #define PROC_WRITE(w, t, a) wrap32 ? \
715 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
716 proc_write_ ## w (t, a)
718 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
719 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
723 proc_set_traced(struct proc *p, bool stop)
726 sx_assert(&proctree_lock, SX_XLOCKED);
727 PROC_LOCK_ASSERT(p, MA_OWNED);
728 p->p_flag |= P_TRACED;
730 p->p_flag2 |= P2_PTRACE_FSTP;
731 p->p_ptevents = PTRACE_DEFAULT;
735 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
739 struct proc *curp, *p, *pp;
740 struct thread *td2 = NULL, *td3;
741 struct ptrace_io_desc *piod = NULL;
742 struct ptrace_lwpinfo *pl;
743 struct ptrace_sc_ret *psr;
745 int proctree_locked = 0;
746 lwpid_t tid = 0, *buf;
747 #ifdef COMPAT_FREEBSD32
748 int wrap32 = 0, safe = 0;
749 struct ptrace_io_desc32 *piod32 = NULL;
750 struct ptrace_lwpinfo32 *pl32 = NULL;
751 struct ptrace_sc_ret32 *psr32 = NULL;
753 struct ptrace_lwpinfo pl;
754 struct ptrace_sc_ret psr;
760 /* Lock proctree before locking the process. */
771 case PT_GET_EVENT_MASK:
772 case PT_SET_EVENT_MASK:
775 sx_xlock(&proctree_lock);
782 if (req == PT_TRACE_ME) {
786 if (pid <= PID_MAX) {
787 if ((p = pfind(pid)) == NULL) {
789 sx_xunlock(&proctree_lock);
793 td2 = tdfind(pid, -1);
796 sx_xunlock(&proctree_lock);
804 AUDIT_ARG_PROCESS(p);
806 if ((p->p_flag & P_WEXIT) != 0) {
810 if ((error = p_cansee(td, p)) != 0)
813 if ((error = p_candebug(td, p)) != 0)
817 * System processes can't be debugged.
819 if ((p->p_flag & P_SYSTEM) != 0) {
825 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
826 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
829 td2 = FIRST_THREAD_IN_PROC(p);
834 #ifdef COMPAT_FREEBSD32
836 * Test if we're a 32 bit client and what the target is.
837 * Set the wrap controls accordingly.
839 if (SV_CURPROC_FLAG(SV_ILP32)) {
840 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
851 * Always legal, when there is a parent process which
852 * could trace us. Otherwise, reject.
854 if ((p->p_flag & P_TRACED) != 0) {
858 if (p->p_pptr == initproc) {
866 if (p == td->td_proc) {
872 if (p->p_flag & P_TRACED) {
877 /* Can't trace an ancestor if you're being traced. */
878 if (curp->p_flag & P_TRACED) {
879 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
892 /* Allow thread to clear single step for itself */
893 if (td->td_tid == tid)
898 /* not being traced... */
899 if ((p->p_flag & P_TRACED) == 0) {
904 /* not being traced by YOU */
905 if (p->p_pptr != td->td_proc) {
910 /* not currently stopped */
911 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
912 p->p_suspcount != p->p_numthreads ||
913 (p->p_flag & P_WAITED) == 0) {
922 /* Keep this process around until we finish this request. */
927 * Single step fixup ala procfs
933 * Actually do the requests
936 td->td_retval[0] = 0;
940 /* set my trace flag and "owner" so it can read/write me */
941 proc_set_traced(p, false);
942 if (p->p_flag & P_PPWAIT)
943 p->p_flag |= P_PPTRACE;
944 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
948 /* security check done above */
950 * It would be nice if the tracing relationship was separate
951 * from the parent relationship but that would require
952 * another set of links in the proc struct or for "wait"
953 * to scan the entire proc table. To make life easier,
954 * we just re-parent the process we're trying to trace.
955 * The old parent is remembered so we can put things back
958 proc_set_traced(p, true);
959 proc_reparent(p, td->td_proc, false);
960 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
963 sx_xunlock(&proctree_lock);
965 MPASS(p->p_xthread == NULL);
966 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
969 * If already stopped due to a stop signal, clear the
970 * existing stop before triggering a traced SIGSTOP.
972 if ((p->p_flag & P_STOPPED_SIG) != 0) {
974 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
979 kern_psignal(p, SIGSTOP);
983 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
985 error = ptrace_clear_single_step(td2);
989 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
991 error = ptrace_single_step(td2);
995 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
997 td2->td_dbgflags |= TDB_SUSPEND;
999 td2->td_flags |= TDF_NEEDSUSPCHK;
1004 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
1006 td2->td_dbgflags &= ~TDB_SUSPEND;
1009 case PT_FOLLOW_FORK:
1010 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
1011 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
1012 data ? "enabled" : "disabled");
1014 p->p_ptevents |= PTRACE_FORK;
1016 p->p_ptevents &= ~PTRACE_FORK;
1020 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
1021 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
1022 data ? "enabled" : "disabled");
1024 p->p_ptevents |= PTRACE_LWP;
1026 p->p_ptevents &= ~PTRACE_LWP;
1029 case PT_GET_EVENT_MASK:
1030 if (data != sizeof(p->p_ptevents)) {
1034 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
1036 *(int *)addr = p->p_ptevents;
1039 case PT_SET_EVENT_MASK:
1040 if (data != sizeof(p->p_ptevents)) {
1045 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1046 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
1050 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1051 p->p_pid, p->p_ptevents, tmp);
1052 p->p_ptevents = tmp;
1055 case PT_GET_SC_ARGS:
1056 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
1057 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
1058 #ifdef COMPAT_FREEBSD32
1059 || (wrap32 && !safe)
1065 bzero(addr, sizeof(td2->td_sa.args));
1066 #ifdef COMPAT_FREEBSD32
1068 for (num = 0; num < nitems(td2->td_sa.args); num++)
1069 ((uint32_t *)addr)[num] = (uint32_t)
1070 td2->td_sa.args[num];
1073 bcopy(td2->td_sa.args, addr, td2->td_sa.narg *
1074 sizeof(register_t));
1078 if ((td2->td_dbgflags & (TDB_SCX)) == 0
1079 #ifdef COMPAT_FREEBSD32
1080 || (wrap32 && !safe)
1086 #ifdef COMPAT_FREEBSD32
1093 bzero(psr, sizeof(*psr));
1094 psr->sr_error = td2->td_errno;
1095 if (psr->sr_error == 0) {
1096 psr->sr_retval[0] = td2->td_retval[0];
1097 psr->sr_retval[1] = td2->td_retval[1];
1099 #ifdef COMPAT_FREEBSD32
1101 ptrace_sc_ret_to32(psr, psr32);
1104 "PT_GET_SC_RET: pid %d error %d retval %#lx,%#lx",
1105 p->p_pid, psr->sr_error, psr->sr_retval[0],
1115 /* Zero means do not send any signal */
1116 if (data < 0 || data > _SIG_MAXSIG) {
1123 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
1124 td2->td_tid, p->p_pid, data);
1125 error = ptrace_single_step(td2);
1133 if (addr != (void *)1) {
1134 error = ptrace_set_pc(td2,
1135 (u_long)(uintfptr_t)addr);
1141 p->p_ptevents |= PTRACE_SCE;
1143 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1144 p->p_pid, p->p_ptevents,
1145 (u_long)(uintfptr_t)addr, data);
1148 p->p_ptevents |= PTRACE_SCX;
1150 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1151 p->p_pid, p->p_ptevents,
1152 (u_long)(uintfptr_t)addr, data);
1155 p->p_ptevents |= PTRACE_SYSCALL;
1157 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1158 p->p_pid, p->p_ptevents,
1159 (u_long)(uintfptr_t)addr, data);
1163 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1164 p->p_pid, (u_long)(uintfptr_t)addr, data);
1170 * Reset the process parent.
1172 * NB: This clears P_TRACED before reparenting
1173 * a detached process back to its original
1174 * parent. Otherwise the debugee will be set
1175 * as an orphan of the debugger.
1177 p->p_flag &= ~(P_TRACED | P_WAITED);
1178 if (p->p_oppid != p->p_pptr->p_pid) {
1179 PROC_LOCK(p->p_pptr);
1180 sigqueue_take(p->p_ksi);
1181 PROC_UNLOCK(p->p_pptr);
1183 pp = proc_realparent(p);
1184 proc_reparent(p, pp, false);
1186 p->p_sigparent = SIGCHLD;
1188 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1189 p->p_pid, pp->p_pid, data);
1191 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1194 FOREACH_THREAD_IN_PROC(p, td3) {
1195 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1196 sigqueue_delete(&td3->td_sigqueue,
1199 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
1203 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1204 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1205 p->p_flag2 &= ~P2_PTRACE_FSTP;
1208 /* should we send SIGCHLD? */
1209 /* childproc_continued(p); */
1213 sx_xunlock(&proctree_lock);
1214 proctree_locked = 0;
1217 MPASS(proctree_locked == 0);
1220 * Clear the pending event for the thread that just
1221 * reported its event (p_xthread). This may not be
1222 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1223 * the debugger is resuming a different thread.
1225 * Deliver any pending signal via the reporting thread.
1227 MPASS(p->p_xthread != NULL);
1228 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
1229 p->p_xthread->td_xsig = data;
1230 p->p_xthread = NULL;
1234 * P_WKILLED is insurance that a PT_KILL/SIGKILL
1235 * always works immediately, even if another thread is
1236 * unsuspended first and attempts to handle a
1237 * different signal or if the POSIX.1b style signal
1238 * queue cannot accommodate any new signals.
1240 if (data == SIGKILL)
1244 * Unsuspend all threads. To leave a thread
1245 * suspended, use PT_SUSPEND to suspend it before
1246 * continuing the process.
1249 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
1250 thread_unsuspend(p);
1256 td2->td_dbgflags |= TDB_USERWR;
1259 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1260 sizeof(int)) != sizeof(int))
1263 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1264 p->p_pid, addr, data);
1272 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1273 sizeof(int)) != sizeof(int))
1276 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1277 p->p_pid, addr, tmp);
1278 td->td_retval[0] = tmp;
1283 #ifdef COMPAT_FREEBSD32
1286 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1287 iov.iov_len = piod32->piod_len;
1288 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1289 uio.uio_resid = piod32->piod_len;
1294 iov.iov_base = piod->piod_addr;
1295 iov.iov_len = piod->piod_len;
1296 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1297 uio.uio_resid = piod->piod_len;
1301 uio.uio_segflg = UIO_USERSPACE;
1303 #ifdef COMPAT_FREEBSD32
1304 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1306 tmp = piod->piod_op;
1311 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1312 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1313 uio.uio_rw = UIO_READ;
1317 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1318 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1319 td2->td_dbgflags |= TDB_USERWR;
1320 uio.uio_rw = UIO_WRITE;
1327 error = proc_rwmem(p, &uio);
1328 #ifdef COMPAT_FREEBSD32
1330 piod32->piod_len -= uio.uio_resid;
1333 piod->piod_len -= uio.uio_resid;
1338 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1340 goto sendsig; /* in PT_CONTINUE above */
1343 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1345 td2->td_dbgflags |= TDB_USERWR;
1346 error = PROC_WRITE(regs, td2, addr);
1350 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1352 error = PROC_READ(regs, td2, addr);
1356 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1358 td2->td_dbgflags |= TDB_USERWR;
1359 error = PROC_WRITE(fpregs, td2, addr);
1363 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1365 error = PROC_READ(fpregs, td2, addr);
1369 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1371 td2->td_dbgflags |= TDB_USERWR;
1372 error = PROC_WRITE(dbregs, td2, addr);
1376 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1378 error = PROC_READ(dbregs, td2, addr);
1383 #ifdef COMPAT_FREEBSD32
1384 (!wrap32 && data > sizeof(*pl)) ||
1385 (wrap32 && data > sizeof(*pl32))) {
1387 data > sizeof(*pl)) {
1392 #ifdef COMPAT_FREEBSD32
1399 bzero(pl, sizeof(*pl));
1400 pl->pl_lwpid = td2->td_tid;
1401 pl->pl_event = PL_EVENT_NONE;
1403 if (td2->td_dbgflags & TDB_XSIG) {
1404 pl->pl_event = PL_EVENT_SIGNAL;
1405 if (td2->td_si.si_signo != 0 &&
1406 #ifdef COMPAT_FREEBSD32
1407 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1408 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1409 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1410 pl_siginfo) + sizeof(struct siginfo32)))
1412 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1413 + sizeof(pl->pl_siginfo)
1416 pl->pl_flags |= PL_FLAG_SI;
1417 pl->pl_siginfo = td2->td_si;
1420 if (td2->td_dbgflags & TDB_SCE)
1421 pl->pl_flags |= PL_FLAG_SCE;
1422 else if (td2->td_dbgflags & TDB_SCX)
1423 pl->pl_flags |= PL_FLAG_SCX;
1424 if (td2->td_dbgflags & TDB_EXEC)
1425 pl->pl_flags |= PL_FLAG_EXEC;
1426 if (td2->td_dbgflags & TDB_FORK) {
1427 pl->pl_flags |= PL_FLAG_FORKED;
1428 pl->pl_child_pid = td2->td_dbg_forked;
1429 if (td2->td_dbgflags & TDB_VFORK)
1430 pl->pl_flags |= PL_FLAG_VFORKED;
1431 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1433 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1434 if (td2->td_dbgflags & TDB_CHILD)
1435 pl->pl_flags |= PL_FLAG_CHILD;
1436 if (td2->td_dbgflags & TDB_BORN)
1437 pl->pl_flags |= PL_FLAG_BORN;
1438 if (td2->td_dbgflags & TDB_EXIT)
1439 pl->pl_flags |= PL_FLAG_EXITED;
1440 pl->pl_sigmask = td2->td_sigmask;
1441 pl->pl_siglist = td2->td_siglist;
1442 strcpy(pl->pl_tdname, td2->td_name);
1443 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1444 pl->pl_syscall_code = td2->td_sa.code;
1445 pl->pl_syscall_narg = td2->td_sa.narg;
1447 pl->pl_syscall_code = 0;
1448 pl->pl_syscall_narg = 0;
1450 #ifdef COMPAT_FREEBSD32
1452 ptrace_lwpinfo_to32(pl, pl32);
1455 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1456 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1457 pl->pl_child_pid, pl->pl_syscall_code);
1461 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1463 td->td_retval[0] = p->p_numthreads;
1467 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1468 p->p_pid, data, p->p_numthreads);
1473 num = imin(p->p_numthreads, data);
1475 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1478 FOREACH_THREAD_IN_PROC(p, td2) {
1481 buf[tmp++] = td2->td_tid;
1484 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1487 td->td_retval[0] = tmp;
1491 case PT_VM_TIMESTAMP:
1492 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1493 p->p_pid, p->p_vmspace->vm_map.timestamp);
1494 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1499 #ifdef COMPAT_FREEBSD32
1501 error = ptrace_vm_entry32(td, p, addr);
1504 error = ptrace_vm_entry(td, p, addr);
1509 #ifdef __HAVE_PTRACE_MACHDEP
1510 if (req >= PT_FIRSTMACH) {
1512 error = cpu_ptrace(td2, req, addr, data);
1516 /* Unknown request. */
1522 /* Drop our hold on this process now that the request has completed. */
1526 if (proctree_locked)
1527 sx_xunlock(&proctree_lock);
1534 * Stop a process because of a debugging event;
1535 * stay stopped until p->p_step is cleared
1536 * (cleared by PIOCCONT in procfs).
1539 stopevent(struct proc *p, unsigned int event, unsigned int val)
1542 PROC_LOCK_ASSERT(p, MA_OWNED);
1544 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1547 if (event != S_EXIT)
1549 p->p_xthread = NULL;
1550 p->p_stype = event; /* Which event caused the stop? */
1551 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1552 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1553 } while (p->p_step);