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_vm_entry32 {
94 * Functions implemented using PROC_ACTION():
96 * proc_read_regs(proc, regs)
97 * Get the current user-visible register set from the process
98 * and copy it into the regs structure (<machine/reg.h>).
99 * The process is stopped at the time read_regs is called.
101 * proc_write_regs(proc, regs)
102 * Update the current register set from the passed in regs
103 * structure. Take care to avoid clobbering special CPU
104 * registers or privileged bits in the PSL.
105 * Depending on the architecture this may have fix-up work to do,
106 * especially if the IAR or PCW are modified.
107 * The process is stopped at the time write_regs is called.
109 * proc_read_fpregs, proc_write_fpregs
110 * deal with the floating point register set, otherwise as above.
112 * proc_read_dbregs, proc_write_dbregs
113 * deal with the processor debug register set, otherwise as above.
116 * Arrange for the process to trap after executing a single instruction.
119 #define PROC_ACTION(action) do { \
122 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
123 if ((td->td_proc->p_flag & P_INMEM) == 0) \
131 proc_read_regs(struct thread *td, struct reg *regs)
134 PROC_ACTION(fill_regs(td, regs));
138 proc_write_regs(struct thread *td, struct reg *regs)
141 PROC_ACTION(set_regs(td, regs));
145 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
148 PROC_ACTION(fill_dbregs(td, dbregs));
152 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
155 PROC_ACTION(set_dbregs(td, dbregs));
159 * Ptrace doesn't support fpregs at all, and there are no security holes
160 * or translations for fpregs, so we can just copy them.
163 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
166 PROC_ACTION(fill_fpregs(td, fpregs));
170 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
173 PROC_ACTION(set_fpregs(td, fpregs));
176 #ifdef COMPAT_FREEBSD32
177 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
179 proc_read_regs32(struct thread *td, struct reg32 *regs32)
182 PROC_ACTION(fill_regs32(td, regs32));
186 proc_write_regs32(struct thread *td, struct reg32 *regs32)
189 PROC_ACTION(set_regs32(td, regs32));
193 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
196 PROC_ACTION(fill_dbregs32(td, dbregs32));
200 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
203 PROC_ACTION(set_dbregs32(td, dbregs32));
207 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
210 PROC_ACTION(fill_fpregs32(td, fpregs32));
214 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
217 PROC_ACTION(set_fpregs32(td, fpregs32));
222 proc_sstep(struct thread *td)
225 PROC_ACTION(ptrace_single_step(td));
229 proc_rwmem(struct proc *p, struct uio *uio)
232 vm_offset_t pageno; /* page number */
234 int error, fault_flags, page_offset, writing;
237 * Assert that someone has locked this vmspace. (Should be
238 * curthread but we can't assert that.) This keeps the process
239 * from exiting out from under us until this operation completes.
242 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
247 map = &p->p_vmspace->vm_map;
250 * If we are writing, then we request vm_fault() to create a private
251 * copy of each page. Since these copies will not be writeable by the
252 * process, we must explicity request that they be dirtied.
254 writing = uio->uio_rw == UIO_WRITE;
255 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
256 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
259 * Only map in one page at a time. We don't have to, but it
260 * makes things easier. This way is trivial - right?
267 uva = (vm_offset_t)uio->uio_offset;
270 * Get the page number of this segment.
272 pageno = trunc_page(uva);
273 page_offset = uva - pageno;
276 * How many bytes to copy
278 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
281 * Fault and hold the page on behalf of the process.
283 error = vm_fault(map, pageno, reqprot, fault_flags, &m);
284 if (error != KERN_SUCCESS) {
285 if (error == KERN_RESOURCE_SHORTAGE)
293 * Now do the i/o move.
295 error = uiomove_fromphys(&m, page_offset, len, uio);
297 /* Make the I-cache coherent for breakpoints. */
298 if (writing && error == 0) {
299 vm_map_lock_read(map);
300 if (vm_map_check_protection(map, pageno, pageno +
301 PAGE_SIZE, VM_PROT_EXECUTE))
302 vm_sync_icache(map, uva, len);
303 vm_map_unlock_read(map);
313 } while (error == 0 && uio->uio_resid > 0);
319 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
320 size_t len, enum uio_rw rw)
326 MPASS(len < SSIZE_MAX);
329 iov.iov_base = (caddr_t)buf;
334 uio.uio_resid = slen;
335 uio.uio_segflg = UIO_SYSSPACE;
339 if (uio.uio_resid == slen)
341 return (slen - uio.uio_resid);
345 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
349 return (proc_iop(td, p, va, buf, len, UIO_READ));
353 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
357 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
361 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
365 vm_map_entry_t entry;
366 vm_object_t obj, tobj, lobj;
369 char *freepath, *fullpath;
376 vm = vmspace_acquire_ref(p);
378 vm_map_lock_read(map);
381 entry = map->header.next;
383 while (index < pve->pve_entry && entry != &map->header) {
387 if (index != pve->pve_entry) {
391 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0,
392 ("Submap in map header"));
393 while ((entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
397 if (entry == &map->header) {
402 /* We got an entry. */
403 pve->pve_entry = index + 1;
404 pve->pve_timestamp = map->timestamp;
405 pve->pve_start = entry->start;
406 pve->pve_end = entry->end - 1;
407 pve->pve_offset = entry->offset;
408 pve->pve_prot = entry->protection;
410 /* Backing object's path needed? */
411 if (pve->pve_pathlen == 0)
414 pathlen = pve->pve_pathlen;
415 pve->pve_pathlen = 0;
417 obj = entry->object.vm_object;
419 VM_OBJECT_RLOCK(obj);
422 vm_map_unlock_read(map);
424 pve->pve_fsid = VNOVAL;
425 pve->pve_fileid = VNOVAL;
427 if (error == 0 && obj != NULL) {
429 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
431 VM_OBJECT_RLOCK(tobj);
433 VM_OBJECT_RUNLOCK(lobj);
435 pve->pve_offset += tobj->backing_object_offset;
437 vp = vm_object_vnode(lobj);
441 VM_OBJECT_RUNLOCK(lobj);
442 VM_OBJECT_RUNLOCK(obj);
447 vn_fullpath(td, vp, &fullpath, &freepath);
448 vn_lock(vp, LK_SHARED | LK_RETRY);
449 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
450 pve->pve_fileid = vattr.va_fileid;
451 pve->pve_fsid = vattr.va_fsid;
455 if (fullpath != NULL) {
456 pve->pve_pathlen = strlen(fullpath) + 1;
457 if (pve->pve_pathlen <= pathlen) {
458 error = copyout(fullpath, pve->pve_path,
461 error = ENAMETOOLONG;
463 if (freepath != NULL)
464 free(freepath, M_TEMP);
469 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
470 p->p_pid, pve->pve_entry, pve->pve_start);
475 #ifdef COMPAT_FREEBSD32
477 ptrace_vm_entry32(struct thread *td, struct proc *p,
478 struct ptrace_vm_entry32 *pve32)
480 struct ptrace_vm_entry pve;
483 pve.pve_entry = pve32->pve_entry;
484 pve.pve_pathlen = pve32->pve_pathlen;
485 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
487 error = ptrace_vm_entry(td, p, &pve);
489 pve32->pve_entry = pve.pve_entry;
490 pve32->pve_timestamp = pve.pve_timestamp;
491 pve32->pve_start = pve.pve_start;
492 pve32->pve_end = pve.pve_end;
493 pve32->pve_offset = pve.pve_offset;
494 pve32->pve_prot = pve.pve_prot;
495 pve32->pve_fileid = pve.pve_fileid;
496 pve32->pve_fsid = pve.pve_fsid;
499 pve32->pve_pathlen = pve.pve_pathlen;
504 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
505 struct ptrace_lwpinfo32 *pl32)
508 bzero(pl32, sizeof(*pl32));
509 pl32->pl_lwpid = pl->pl_lwpid;
510 pl32->pl_event = pl->pl_event;
511 pl32->pl_flags = pl->pl_flags;
512 pl32->pl_sigmask = pl->pl_sigmask;
513 pl32->pl_siglist = pl->pl_siglist;
514 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
515 strcpy(pl32->pl_tdname, pl->pl_tdname);
516 pl32->pl_child_pid = pl->pl_child_pid;
517 pl32->pl_syscall_code = pl->pl_syscall_code;
518 pl32->pl_syscall_narg = pl->pl_syscall_narg;
520 #endif /* COMPAT_FREEBSD32 */
523 * Process debugging system call.
525 #ifndef _SYS_SYSPROTO_H_
534 #ifdef COMPAT_FREEBSD32
536 * This CPP subterfuge is to try and reduce the number of ifdefs in
537 * the body of the code.
538 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
540 * copyin(uap->addr, &r.reg, sizeof r.reg);
542 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
543 * .. except this is done at runtime.
545 #define BZERO(a, s) wrap32 ? \
546 bzero(a ## 32, s ## 32) : \
548 #define COPYIN(u, k, s) wrap32 ? \
549 copyin(u, k ## 32, s ## 32) : \
551 #define COPYOUT(k, u, s) wrap32 ? \
552 copyout(k ## 32, u, s ## 32) : \
555 #define BZERO(a, s) bzero(a, s)
556 #define COPYIN(u, k, s) copyin(u, k, s)
557 #define COPYOUT(k, u, s) copyout(k, u, s)
560 sys_ptrace(struct thread *td, struct ptrace_args *uap)
563 * XXX this obfuscation is to reduce stack usage, but the register
564 * structs may be too large to put on the stack anyway.
567 struct ptrace_io_desc piod;
568 struct ptrace_lwpinfo pl;
569 struct ptrace_vm_entry pve;
573 #ifdef COMPAT_FREEBSD32
574 struct dbreg32 dbreg32;
575 struct fpreg32 fpreg32;
577 struct ptrace_io_desc32 piod32;
578 struct ptrace_lwpinfo32 pl32;
579 struct ptrace_vm_entry32 pve32;
581 char args[sizeof(td->td_sa.args)];
586 #ifdef COMPAT_FREEBSD32
589 if (SV_CURPROC_FLAG(SV_ILP32))
592 AUDIT_ARG_PID(uap->pid);
593 AUDIT_ARG_CMD(uap->req);
594 AUDIT_ARG_VALUE(uap->data);
597 case PT_GET_EVENT_MASK:
602 BZERO(&r.reg, sizeof r.reg);
605 BZERO(&r.fpreg, sizeof r.fpreg);
608 BZERO(&r.dbreg, sizeof r.dbreg);
611 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
614 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
617 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
619 case PT_SET_EVENT_MASK:
620 if (uap->data != sizeof(r.ptevents))
623 error = copyin(uap->addr, &r.ptevents, uap->data);
626 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
629 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
638 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
644 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
647 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
650 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
653 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
656 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
658 case PT_GET_EVENT_MASK:
659 /* NB: The size in uap->data is validated in kern_ptrace(). */
660 error = copyout(&r.ptevents, uap->addr, uap->data);
663 /* NB: The size in uap->data is validated in kern_ptrace(). */
664 error = copyout(&r.pl, uap->addr, uap->data);
667 error = copyout(r.args, uap->addr, MIN(uap->data,
678 #ifdef COMPAT_FREEBSD32
680 * PROC_READ(regs, td2, addr);
682 * proc_read_regs(td2, addr);
684 * proc_read_regs32(td2, addr);
685 * .. except this is done at runtime. There is an additional
686 * complication in that PROC_WRITE disallows 32 bit consumers
687 * from writing to 64 bit address space targets.
689 #define PROC_READ(w, t, a) wrap32 ? \
690 proc_read_ ## w ## 32(t, a) : \
691 proc_read_ ## w (t, a)
692 #define PROC_WRITE(w, t, a) wrap32 ? \
693 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
694 proc_write_ ## w (t, a)
696 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
697 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
701 proc_set_traced(struct proc *p, bool stop)
704 sx_assert(&proctree_lock, SX_XLOCKED);
705 PROC_LOCK_ASSERT(p, MA_OWNED);
706 p->p_flag |= P_TRACED;
708 p->p_flag2 |= P2_PTRACE_FSTP;
709 p->p_ptevents = PTRACE_DEFAULT;
713 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
717 struct proc *curp, *p, *pp;
718 struct thread *td2 = NULL, *td3;
719 struct ptrace_io_desc *piod = NULL;
720 struct ptrace_lwpinfo *pl;
722 int proctree_locked = 0;
723 lwpid_t tid = 0, *buf;
724 #ifdef COMPAT_FREEBSD32
725 int wrap32 = 0, safe = 0;
726 struct ptrace_io_desc32 *piod32 = NULL;
727 struct ptrace_lwpinfo32 *pl32 = NULL;
728 struct ptrace_lwpinfo plr;
733 /* Lock proctree before locking the process. */
744 case PT_GET_EVENT_MASK:
745 case PT_SET_EVENT_MASK:
748 sx_xlock(&proctree_lock);
755 if (req == PT_TRACE_ME) {
759 if (pid <= PID_MAX) {
760 if ((p = pfind(pid)) == NULL) {
762 sx_xunlock(&proctree_lock);
766 td2 = tdfind(pid, -1);
769 sx_xunlock(&proctree_lock);
777 AUDIT_ARG_PROCESS(p);
779 if ((p->p_flag & P_WEXIT) != 0) {
783 if ((error = p_cansee(td, p)) != 0)
786 if ((error = p_candebug(td, p)) != 0)
790 * System processes can't be debugged.
792 if ((p->p_flag & P_SYSTEM) != 0) {
798 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
799 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
802 td2 = FIRST_THREAD_IN_PROC(p);
807 #ifdef COMPAT_FREEBSD32
809 * Test if we're a 32 bit client and what the target is.
810 * Set the wrap controls accordingly.
812 if (SV_CURPROC_FLAG(SV_ILP32)) {
813 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
824 * Always legal, when there is a parent process which
825 * could trace us. Otherwise, reject.
827 if ((p->p_flag & P_TRACED) != 0) {
831 if (p->p_pptr == initproc) {
839 if (p == td->td_proc) {
845 if (p->p_flag & P_TRACED) {
850 /* Can't trace an ancestor if you're being traced. */
851 if (curp->p_flag & P_TRACED) {
852 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
865 /* Allow thread to clear single step for itself */
866 if (td->td_tid == tid)
871 /* not being traced... */
872 if ((p->p_flag & P_TRACED) == 0) {
877 /* not being traced by YOU */
878 if (p->p_pptr != td->td_proc) {
883 /* not currently stopped */
884 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
885 p->p_suspcount != p->p_numthreads ||
886 (p->p_flag & P_WAITED) == 0) {
895 /* Keep this process around until we finish this request. */
900 * Single step fixup ala procfs
906 * Actually do the requests
909 td->td_retval[0] = 0;
913 /* set my trace flag and "owner" so it can read/write me */
914 proc_set_traced(p, false);
915 if (p->p_flag & P_PPWAIT)
916 p->p_flag |= P_PPTRACE;
917 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
921 /* security check done above */
923 * It would be nice if the tracing relationship was separate
924 * from the parent relationship but that would require
925 * another set of links in the proc struct or for "wait"
926 * to scan the entire proc table. To make life easier,
927 * we just re-parent the process we're trying to trace.
928 * The old parent is remembered so we can put things back
931 proc_set_traced(p, true);
932 proc_reparent(p, td->td_proc, false);
933 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
936 sx_xunlock(&proctree_lock);
938 MPASS(p->p_xthread == NULL);
939 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
942 * If already stopped due to a stop signal, clear the
943 * existing stop before triggering a traced SIGSTOP.
945 if ((p->p_flag & P_STOPPED_SIG) != 0) {
947 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
952 kern_psignal(p, SIGSTOP);
956 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
958 error = ptrace_clear_single_step(td2);
962 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
964 error = ptrace_single_step(td2);
968 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
970 td2->td_dbgflags |= TDB_SUSPEND;
972 td2->td_flags |= TDF_NEEDSUSPCHK;
977 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
979 td2->td_dbgflags &= ~TDB_SUSPEND;
983 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
984 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
985 data ? "enabled" : "disabled");
987 p->p_ptevents |= PTRACE_FORK;
989 p->p_ptevents &= ~PTRACE_FORK;
993 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
994 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
995 data ? "enabled" : "disabled");
997 p->p_ptevents |= PTRACE_LWP;
999 p->p_ptevents &= ~PTRACE_LWP;
1002 case PT_GET_EVENT_MASK:
1003 if (data != sizeof(p->p_ptevents)) {
1007 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
1009 *(int *)addr = p->p_ptevents;
1012 case PT_SET_EVENT_MASK:
1013 if (data != sizeof(p->p_ptevents)) {
1018 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1019 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
1023 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1024 p->p_pid, p->p_ptevents, tmp);
1025 p->p_ptevents = tmp;
1028 case PT_GET_SC_ARGS:
1029 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
1030 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
1031 #ifdef COMPAT_FREEBSD32
1032 || (wrap32 && !safe)
1038 bzero(addr, sizeof(td2->td_sa.args));
1039 #ifdef COMPAT_FREEBSD32
1041 for (num = 0; num < nitems(td2->td_sa.args); num++)
1042 ((uint32_t *)addr)[num] = (uint32_t)
1043 td2->td_sa.args[num];
1046 bcopy(td2->td_sa.args, addr, td2->td_sa.narg *
1047 sizeof(register_t));
1056 /* Zero means do not send any signal */
1057 if (data < 0 || data > _SIG_MAXSIG) {
1064 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
1065 td2->td_tid, p->p_pid, data);
1066 error = ptrace_single_step(td2);
1074 if (addr != (void *)1) {
1075 error = ptrace_set_pc(td2,
1076 (u_long)(uintfptr_t)addr);
1082 p->p_ptevents |= PTRACE_SCE;
1084 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1085 p->p_pid, p->p_ptevents,
1086 (u_long)(uintfptr_t)addr, data);
1089 p->p_ptevents |= PTRACE_SCX;
1091 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1092 p->p_pid, p->p_ptevents,
1093 (u_long)(uintfptr_t)addr, data);
1096 p->p_ptevents |= PTRACE_SYSCALL;
1098 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1099 p->p_pid, p->p_ptevents,
1100 (u_long)(uintfptr_t)addr, data);
1104 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1105 p->p_pid, (u_long)(uintfptr_t)addr, data);
1111 * Reset the process parent.
1113 * NB: This clears P_TRACED before reparenting
1114 * a detached process back to its original
1115 * parent. Otherwise the debugee will be set
1116 * as an orphan of the debugger.
1118 p->p_flag &= ~(P_TRACED | P_WAITED);
1119 if (p->p_oppid != p->p_pptr->p_pid) {
1120 PROC_LOCK(p->p_pptr);
1121 sigqueue_take(p->p_ksi);
1122 PROC_UNLOCK(p->p_pptr);
1124 pp = proc_realparent(p);
1125 proc_reparent(p, pp, false);
1127 p->p_sigparent = SIGCHLD;
1129 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1130 p->p_pid, pp->p_pid, data);
1132 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1135 FOREACH_THREAD_IN_PROC(p, td3) {
1136 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1137 sigqueue_delete(&td3->td_sigqueue,
1140 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
1144 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1145 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1146 p->p_flag2 &= ~P2_PTRACE_FSTP;
1149 /* should we send SIGCHLD? */
1150 /* childproc_continued(p); */
1154 sx_xunlock(&proctree_lock);
1155 proctree_locked = 0;
1158 MPASS(proctree_locked == 0);
1161 * Clear the pending event for the thread that just
1162 * reported its event (p_xthread). This may not be
1163 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1164 * the debugger is resuming a different thread.
1166 * Deliver any pending signal via the reporting thread.
1168 MPASS(p->p_xthread != NULL);
1169 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
1170 p->p_xthread->td_xsig = data;
1171 p->p_xthread = NULL;
1175 * P_WKILLED is insurance that a PT_KILL/SIGKILL
1176 * always works immediately, even if another thread is
1177 * unsuspended first and attempts to handle a
1178 * different signal or if the POSIX.1b style signal
1179 * queue cannot accommodate any new signals.
1181 if (data == SIGKILL)
1185 * Unsuspend all threads. To leave a thread
1186 * suspended, use PT_SUSPEND to suspend it before
1187 * continuing the process.
1190 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
1191 thread_unsuspend(p);
1197 td2->td_dbgflags |= TDB_USERWR;
1200 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1201 sizeof(int)) != sizeof(int))
1204 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1205 p->p_pid, addr, data);
1213 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1214 sizeof(int)) != sizeof(int))
1217 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1218 p->p_pid, addr, tmp);
1219 td->td_retval[0] = tmp;
1224 #ifdef COMPAT_FREEBSD32
1227 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1228 iov.iov_len = piod32->piod_len;
1229 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1230 uio.uio_resid = piod32->piod_len;
1235 iov.iov_base = piod->piod_addr;
1236 iov.iov_len = piod->piod_len;
1237 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1238 uio.uio_resid = piod->piod_len;
1242 uio.uio_segflg = UIO_USERSPACE;
1244 #ifdef COMPAT_FREEBSD32
1245 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1247 tmp = piod->piod_op;
1252 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1253 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1254 uio.uio_rw = UIO_READ;
1258 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1259 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1260 td2->td_dbgflags |= TDB_USERWR;
1261 uio.uio_rw = UIO_WRITE;
1268 error = proc_rwmem(p, &uio);
1269 #ifdef COMPAT_FREEBSD32
1271 piod32->piod_len -= uio.uio_resid;
1274 piod->piod_len -= uio.uio_resid;
1279 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1281 goto sendsig; /* in PT_CONTINUE above */
1284 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1286 td2->td_dbgflags |= TDB_USERWR;
1287 error = PROC_WRITE(regs, td2, addr);
1291 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1293 error = PROC_READ(regs, td2, addr);
1297 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1299 td2->td_dbgflags |= TDB_USERWR;
1300 error = PROC_WRITE(fpregs, td2, addr);
1304 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1306 error = PROC_READ(fpregs, td2, addr);
1310 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1312 td2->td_dbgflags |= TDB_USERWR;
1313 error = PROC_WRITE(dbregs, td2, addr);
1317 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1319 error = PROC_READ(dbregs, td2, addr);
1324 #ifdef COMPAT_FREEBSD32
1325 (!wrap32 && data > sizeof(*pl)) ||
1326 (wrap32 && data > sizeof(*pl32))) {
1328 data > sizeof(*pl)) {
1333 #ifdef COMPAT_FREEBSD32
1340 bzero(pl, sizeof(*pl));
1341 pl->pl_lwpid = td2->td_tid;
1342 pl->pl_event = PL_EVENT_NONE;
1344 if (td2->td_dbgflags & TDB_XSIG) {
1345 pl->pl_event = PL_EVENT_SIGNAL;
1346 if (td2->td_si.si_signo != 0 &&
1347 #ifdef COMPAT_FREEBSD32
1348 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1349 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1350 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1351 pl_siginfo) + sizeof(struct siginfo32)))
1353 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1354 + sizeof(pl->pl_siginfo)
1357 pl->pl_flags |= PL_FLAG_SI;
1358 pl->pl_siginfo = td2->td_si;
1361 if (td2->td_dbgflags & TDB_SCE)
1362 pl->pl_flags |= PL_FLAG_SCE;
1363 else if (td2->td_dbgflags & TDB_SCX)
1364 pl->pl_flags |= PL_FLAG_SCX;
1365 if (td2->td_dbgflags & TDB_EXEC)
1366 pl->pl_flags |= PL_FLAG_EXEC;
1367 if (td2->td_dbgflags & TDB_FORK) {
1368 pl->pl_flags |= PL_FLAG_FORKED;
1369 pl->pl_child_pid = td2->td_dbg_forked;
1370 if (td2->td_dbgflags & TDB_VFORK)
1371 pl->pl_flags |= PL_FLAG_VFORKED;
1372 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1374 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1375 if (td2->td_dbgflags & TDB_CHILD)
1376 pl->pl_flags |= PL_FLAG_CHILD;
1377 if (td2->td_dbgflags & TDB_BORN)
1378 pl->pl_flags |= PL_FLAG_BORN;
1379 if (td2->td_dbgflags & TDB_EXIT)
1380 pl->pl_flags |= PL_FLAG_EXITED;
1381 pl->pl_sigmask = td2->td_sigmask;
1382 pl->pl_siglist = td2->td_siglist;
1383 strcpy(pl->pl_tdname, td2->td_name);
1384 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1385 pl->pl_syscall_code = td2->td_sa.code;
1386 pl->pl_syscall_narg = td2->td_sa.narg;
1388 pl->pl_syscall_code = 0;
1389 pl->pl_syscall_narg = 0;
1391 #ifdef COMPAT_FREEBSD32
1393 ptrace_lwpinfo_to32(pl, pl32);
1396 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1397 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1398 pl->pl_child_pid, pl->pl_syscall_code);
1402 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1404 td->td_retval[0] = p->p_numthreads;
1408 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1409 p->p_pid, data, p->p_numthreads);
1414 num = imin(p->p_numthreads, data);
1416 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1419 FOREACH_THREAD_IN_PROC(p, td2) {
1422 buf[tmp++] = td2->td_tid;
1425 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1428 td->td_retval[0] = tmp;
1432 case PT_VM_TIMESTAMP:
1433 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1434 p->p_pid, p->p_vmspace->vm_map.timestamp);
1435 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1440 #ifdef COMPAT_FREEBSD32
1442 error = ptrace_vm_entry32(td, p, addr);
1445 error = ptrace_vm_entry(td, p, addr);
1450 #ifdef __HAVE_PTRACE_MACHDEP
1451 if (req >= PT_FIRSTMACH) {
1453 error = cpu_ptrace(td2, req, addr, data);
1457 /* Unknown request. */
1463 /* Drop our hold on this process now that the request has completed. */
1467 if (proctree_locked)
1468 sx_xunlock(&proctree_lock);
1475 * Stop a process because of a debugging event;
1476 * stay stopped until p->p_step is cleared
1477 * (cleared by PIOCCONT in procfs).
1480 stopevent(struct proc *p, unsigned int event, unsigned int val)
1483 PROC_LOCK_ASSERT(p, MA_OWNED);
1485 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1488 if (event != S_EXIT)
1490 p->p_xthread = NULL;
1491 p->p_stype = event; /* Which event caused the stop? */
1492 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1493 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1494 } while (p->p_step);