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/limits.h>
42 #include <sys/mutex.h>
44 #include <sys/syscallsubr.h>
45 #include <sys/sysent.h>
46 #include <sys/sysproto.h>
49 #include <sys/vnode.h>
50 #include <sys/ptrace.h>
51 #include <sys/rwlock.h>
53 #include <sys/malloc.h>
54 #include <sys/signalvar.h>
55 #include <sys/caprights.h>
56 #include <sys/filedesc.h>
58 #include <security/audit/audit.h>
62 #include <vm/vm_extern.h>
63 #include <vm/vm_map.h>
64 #include <vm/vm_kern.h>
65 #include <vm/vm_object.h>
66 #include <vm/vm_page.h>
67 #include <vm/vm_param.h>
69 #ifdef COMPAT_FREEBSD32
70 #include <sys/procfs.h>
73 /* Assert it's safe to unlock a process, e.g. to allocate working memory */
74 #define PROC_ASSERT_TRACEREQ(p) MPASS(((p)->p_flag2 & P2_PTRACEREQ) != 0)
77 * Functions implemented using PROC_ACTION():
79 * proc_read_regs(proc, regs)
80 * Get the current user-visible register set from the process
81 * and copy it into the regs structure (<machine/reg.h>).
82 * The process is stopped at the time read_regs is called.
84 * proc_write_regs(proc, regs)
85 * Update the current register set from the passed in regs
86 * structure. Take care to avoid clobbering special CPU
87 * registers or privileged bits in the PSL.
88 * Depending on the architecture this may have fix-up work to do,
89 * especially if the IAR or PCW are modified.
90 * The process is stopped at the time write_regs is called.
92 * proc_read_fpregs, proc_write_fpregs
93 * deal with the floating point register set, otherwise as above.
95 * proc_read_dbregs, proc_write_dbregs
96 * deal with the processor debug register set, otherwise as above.
99 * Arrange for the process to trap after executing a single instruction.
102 #define PROC_ACTION(action) do { \
105 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
106 if ((td->td_proc->p_flag & P_INMEM) == 0) \
114 proc_read_regs(struct thread *td, struct reg *regs)
117 PROC_ACTION(fill_regs(td, regs));
121 proc_write_regs(struct thread *td, struct reg *regs)
124 PROC_ACTION(set_regs(td, regs));
128 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
131 PROC_ACTION(fill_dbregs(td, dbregs));
135 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
138 PROC_ACTION(set_dbregs(td, dbregs));
142 * Ptrace doesn't support fpregs at all, and there are no security holes
143 * or translations for fpregs, so we can just copy them.
146 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
149 PROC_ACTION(fill_fpregs(td, fpregs));
153 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
156 PROC_ACTION(set_fpregs(td, fpregs));
159 static struct regset *
160 proc_find_regset(struct thread *td, int note)
162 struct regset **regsetp, **regset_end, *regset;
163 struct sysentvec *sv;
165 sv = td->td_proc->p_sysent;
166 regsetp = sv->sv_regset_begin;
169 regset_end = sv->sv_regset_end;
170 MPASS(regset_end != NULL);
171 for (; regsetp < regset_end; regsetp++) {
173 if (regset->note != note)
183 proc_read_regset(struct thread *td, int note, struct iovec *iov)
185 struct regset *regset;
191 regset = proc_find_regset(td, note);
195 if (iov->iov_base == NULL) {
196 iov->iov_len = regset->size;
197 if (iov->iov_len == 0)
203 /* The length is wrong, return an error */
204 if (iov->iov_len != regset->size)
207 if (regset->get == NULL)
214 /* Drop the proc lock while allocating the temp buffer */
215 PROC_ASSERT_TRACEREQ(p);
217 buf = malloc(size, M_TEMP, M_WAITOK);
220 if (!regset->get(regset, td, buf, &size)) {
223 KASSERT(size == regset->size,
224 ("%s: Getter function changed the size", __func__));
228 error = copyout(buf, iov->iov_base, size);
238 proc_write_regset(struct thread *td, int note, struct iovec *iov)
240 struct regset *regset;
246 regset = proc_find_regset(td, note);
250 /* The length is wrong, return an error */
251 if (iov->iov_len != regset->size)
254 if (regset->set == NULL)
260 /* Drop the proc lock while allocating the temp buffer */
261 PROC_ASSERT_TRACEREQ(p);
263 buf = malloc(size, M_TEMP, M_WAITOK);
264 error = copyin(iov->iov_base, buf, size);
268 if (!regset->set(regset, td, buf, size)) {
278 #ifdef COMPAT_FREEBSD32
279 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
281 proc_read_regs32(struct thread *td, struct reg32 *regs32)
284 PROC_ACTION(fill_regs32(td, regs32));
288 proc_write_regs32(struct thread *td, struct reg32 *regs32)
291 PROC_ACTION(set_regs32(td, regs32));
295 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
298 PROC_ACTION(fill_dbregs32(td, dbregs32));
302 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
305 PROC_ACTION(set_dbregs32(td, dbregs32));
309 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
312 PROC_ACTION(fill_fpregs32(td, fpregs32));
316 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
319 PROC_ACTION(set_fpregs32(td, fpregs32));
324 proc_sstep(struct thread *td)
327 PROC_ACTION(ptrace_single_step(td));
331 proc_rwmem(struct proc *p, struct uio *uio)
334 vm_offset_t pageno; /* page number */
336 int error, fault_flags, page_offset, writing;
339 * Make sure that the process' vmspace remains live.
343 PROC_LOCK_ASSERT(p, MA_NOTOWNED);
348 map = &p->p_vmspace->vm_map;
351 * If we are writing, then we request vm_fault() to create a private
352 * copy of each page. Since these copies will not be writeable by the
353 * process, we must explicity request that they be dirtied.
355 writing = uio->uio_rw == UIO_WRITE;
356 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
357 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
360 * Only map in one page at a time. We don't have to, but it
361 * makes things easier. This way is trivial - right?
368 uva = (vm_offset_t)uio->uio_offset;
371 * Get the page number of this segment.
373 pageno = trunc_page(uva);
374 page_offset = uva - pageno;
377 * How many bytes to copy
379 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
382 * Fault and hold the page on behalf of the process.
384 error = vm_fault(map, pageno, reqprot, fault_flags, &m);
385 if (error != KERN_SUCCESS) {
386 if (error == KERN_RESOURCE_SHORTAGE)
394 * Now do the i/o move.
396 error = uiomove_fromphys(&m, page_offset, len, uio);
398 /* Make the I-cache coherent for breakpoints. */
399 if (writing && error == 0) {
400 vm_map_lock_read(map);
401 if (vm_map_check_protection(map, pageno, pageno +
402 PAGE_SIZE, VM_PROT_EXECUTE))
403 vm_sync_icache(map, uva, len);
404 vm_map_unlock_read(map);
410 vm_page_unwire(m, PQ_ACTIVE);
412 } while (error == 0 && uio->uio_resid > 0);
418 proc_iop(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
419 size_t len, enum uio_rw rw)
425 MPASS(len < SSIZE_MAX);
428 iov.iov_base = (caddr_t)buf;
433 uio.uio_resid = slen;
434 uio.uio_segflg = UIO_SYSSPACE;
438 if (uio.uio_resid == slen)
440 return (slen - uio.uio_resid);
444 proc_readmem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
448 return (proc_iop(td, p, va, buf, len, UIO_READ));
452 proc_writemem(struct thread *td, struct proc *p, vm_offset_t va, void *buf,
456 return (proc_iop(td, p, va, buf, len, UIO_WRITE));
460 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
464 vm_map_entry_t entry;
465 vm_object_t obj, tobj, lobj;
468 char *freepath, *fullpath;
475 vm = vmspace_acquire_ref(p);
477 vm_map_lock_read(map);
480 KASSERT((map->header.eflags & MAP_ENTRY_IS_SUB_MAP) == 0,
481 ("Submap in map header"));
483 VM_MAP_ENTRY_FOREACH(entry, map) {
484 if (index >= pve->pve_entry &&
485 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) == 0)
489 if (index < pve->pve_entry) {
493 if (entry == &map->header) {
498 /* We got an entry. */
499 pve->pve_entry = index + 1;
500 pve->pve_timestamp = map->timestamp;
501 pve->pve_start = entry->start;
502 pve->pve_end = entry->end - 1;
503 pve->pve_offset = entry->offset;
504 pve->pve_prot = entry->protection;
506 /* Backing object's path needed? */
507 if (pve->pve_pathlen == 0)
510 pathlen = pve->pve_pathlen;
511 pve->pve_pathlen = 0;
513 obj = entry->object.vm_object;
515 VM_OBJECT_RLOCK(obj);
518 vm_map_unlock_read(map);
520 pve->pve_fsid = VNOVAL;
521 pve->pve_fileid = VNOVAL;
523 if (error == 0 && obj != NULL) {
525 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
527 VM_OBJECT_RLOCK(tobj);
529 VM_OBJECT_RUNLOCK(lobj);
531 pve->pve_offset += tobj->backing_object_offset;
533 vp = vm_object_vnode(lobj);
537 VM_OBJECT_RUNLOCK(lobj);
538 VM_OBJECT_RUNLOCK(obj);
543 vn_fullpath(vp, &fullpath, &freepath);
544 vn_lock(vp, LK_SHARED | LK_RETRY);
545 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
546 pve->pve_fileid = vattr.va_fileid;
547 pve->pve_fsid = vattr.va_fsid;
551 if (fullpath != NULL) {
552 pve->pve_pathlen = strlen(fullpath) + 1;
553 if (pve->pve_pathlen <= pathlen) {
554 error = copyout(fullpath, pve->pve_path,
557 error = ENAMETOOLONG;
559 if (freepath != NULL)
560 free(freepath, M_TEMP);
565 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
566 p->p_pid, pve->pve_entry, pve->pve_start);
572 * Process debugging system call.
574 #ifndef _SYS_SYSPROTO_H_
584 sys_ptrace(struct thread *td, struct ptrace_args *uap)
587 * XXX this obfuscation is to reduce stack usage, but the register
588 * structs may be too large to put on the stack anyway.
591 struct ptrace_io_desc piod;
592 struct ptrace_lwpinfo pl;
593 struct ptrace_vm_entry pve;
594 struct ptrace_coredump pc;
595 struct ptrace_sc_remote sr;
600 char args[sizeof(td->td_sa.args)];
601 struct ptrace_sc_ret psr;
604 register_t pscr_args[nitems(td->td_sa.args)];
612 AUDIT_ARG_PID(uap->pid);
613 AUDIT_ARG_CMD(uap->req);
614 AUDIT_ARG_VALUE(uap->data);
617 case PT_GET_EVENT_MASK:
623 bzero(&r.reg, sizeof(r.reg));
626 bzero(&r.fpreg, sizeof(r.fpreg));
629 bzero(&r.dbreg, sizeof(r.dbreg));
633 error = copyin(uap->addr, &r.vec, sizeof(r.vec));
636 error = copyin(uap->addr, &r.reg, sizeof(r.reg));
639 error = copyin(uap->addr, &r.fpreg, sizeof(r.fpreg));
642 error = copyin(uap->addr, &r.dbreg, sizeof(r.dbreg));
644 case PT_SET_EVENT_MASK:
645 if (uap->data != sizeof(r.ptevents))
648 error = copyin(uap->addr, &r.ptevents, uap->data);
651 error = copyin(uap->addr, &r.piod, sizeof(r.piod));
654 error = copyin(uap->addr, &r.pve, sizeof(r.pve));
657 if (uap->data != sizeof(r.pc))
660 error = copyin(uap->addr, &r.pc, uap->data);
663 if (uap->data != sizeof(r.sr)) {
667 error = copyin(uap->addr, &r.sr, uap->data);
670 if (r.sr.pscr_nargs > nitems(td->td_sa.args)) {
674 error = copyin(r.sr.pscr_args, pscr_args,
675 sizeof(u_long) * r.sr.pscr_nargs);
678 r.sr.pscr_args = pscr_args;
687 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
693 error = copyout(&r.pve, uap->addr, sizeof(r.pve));
696 error = copyout(&r.piod, uap->addr, sizeof(r.piod));
699 error = copyout(&r.reg, uap->addr, sizeof(r.reg));
702 error = copyout(&r.fpreg, uap->addr, sizeof(r.fpreg));
705 error = copyout(&r.dbreg, uap->addr, sizeof(r.dbreg));
708 error = copyout(&r.vec, uap->addr, sizeof(r.vec));
710 case PT_GET_EVENT_MASK:
711 /* NB: The size in uap->data is validated in kern_ptrace(). */
712 error = copyout(&r.ptevents, uap->addr, uap->data);
715 /* NB: The size in uap->data is validated in kern_ptrace(). */
716 error = copyout(&r.pl, uap->addr, uap->data);
719 error = copyout(r.args, uap->addr, MIN(uap->data,
723 error = copyout(&r.psr, uap->addr, MIN(uap->data,
727 error = copyout(&r.sr.pscr_ret, uap->addr +
728 offsetof(struct ptrace_sc_remote, pscr_ret),
729 sizeof(r.sr.pscr_ret));
736 #ifdef COMPAT_FREEBSD32
738 * PROC_READ(regs, td2, addr);
740 * proc_read_regs(td2, addr);
742 * proc_read_regs32(td2, addr);
743 * .. except this is done at runtime. There is an additional
744 * complication in that PROC_WRITE disallows 32 bit consumers
745 * from writing to 64 bit address space targets.
747 #define PROC_READ(w, t, a) wrap32 ? \
748 proc_read_ ## w ## 32(t, a) : \
749 proc_read_ ## w (t, a)
750 #define PROC_WRITE(w, t, a) wrap32 ? \
751 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
752 proc_write_ ## w (t, a)
754 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
755 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
759 proc_set_traced(struct proc *p, bool stop)
762 sx_assert(&proctree_lock, SX_XLOCKED);
763 PROC_LOCK_ASSERT(p, MA_OWNED);
764 p->p_flag |= P_TRACED;
766 p->p_flag2 |= P2_PTRACE_FSTP;
767 p->p_ptevents = PTRACE_DEFAULT;
771 ptrace_unsuspend(struct proc *p)
773 PROC_LOCK_ASSERT(p, MA_OWNED);
776 p->p_flag &= ~(P_STOPPED_TRACE | P_STOPPED_SIG | P_WAITED);
779 itimer_proc_continue(p);
780 kqtimer_proc_continue(p);
784 proc_can_ptrace(struct thread *td, struct proc *p)
788 PROC_LOCK_ASSERT(p, MA_OWNED);
790 if ((p->p_flag & P_WEXIT) != 0)
793 if ((error = p_cansee(td, p)) != 0)
795 if ((error = p_candebug(td, p)) != 0)
798 /* not being traced... */
799 if ((p->p_flag & P_TRACED) == 0)
802 /* not being traced by YOU */
803 if (p->p_pptr != td->td_proc)
806 /* not currently stopped */
807 if ((p->p_flag & P_STOPPED_TRACE) == 0 ||
808 p->p_suspcount != p->p_numthreads ||
809 (p->p_flag & P_WAITED) == 0)
815 static struct thread *
816 ptrace_sel_coredump_thread(struct proc *p)
820 PROC_LOCK_ASSERT(p, MA_OWNED);
821 MPASS((p->p_flag & P_STOPPED_TRACE) != 0);
823 FOREACH_THREAD_IN_PROC(p, td2) {
824 if ((td2->td_dbgflags & TDB_SSWITCH) != 0)
831 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
835 struct proc *curp, *p, *pp;
836 struct thread *td2 = NULL, *td3;
837 struct ptrace_io_desc *piod = NULL;
838 struct ptrace_lwpinfo *pl;
839 struct ptrace_sc_ret *psr;
840 struct ptrace_sc_remote *pscr;
842 struct ptrace_coredump *pc;
843 struct thr_coredump_req *tcq;
844 struct thr_syscall_req *tsr;
846 lwpid_t tid = 0, *buf;
847 #ifdef COMPAT_FREEBSD32
848 int wrap32 = 0, safe = 0;
850 bool proctree_locked, p2_req_set;
853 proctree_locked = false;
856 /* Lock proctree before locking the process. */
867 case PT_GET_EVENT_MASK:
868 case PT_SET_EVENT_MASK:
871 sx_xlock(&proctree_lock);
872 proctree_locked = true;
878 if (req == PT_TRACE_ME) {
882 if (pid <= PID_MAX) {
883 if ((p = pfind(pid)) == NULL) {
885 sx_xunlock(&proctree_lock);
889 td2 = tdfind(pid, -1);
892 sx_xunlock(&proctree_lock);
900 AUDIT_ARG_PROCESS(p);
902 if ((p->p_flag & P_WEXIT) != 0) {
906 if ((error = p_cansee(td, p)) != 0)
909 if ((error = p_candebug(td, p)) != 0)
913 * System processes can't be debugged.
915 if ((p->p_flag & P_SYSTEM) != 0) {
921 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
922 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
925 td2 = FIRST_THREAD_IN_PROC(p);
930 #ifdef COMPAT_FREEBSD32
932 * Test if we're a 32 bit client and what the target is.
933 * Set the wrap controls accordingly.
935 if (SV_CURPROC_FLAG(SV_ILP32)) {
936 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
947 * Always legal, when there is a parent process which
948 * could trace us. Otherwise, reject.
950 if ((p->p_flag & P_TRACED) != 0) {
954 if (p->p_pptr == initproc) {
962 if (p == td->td_proc) {
968 if (p->p_flag & P_TRACED) {
973 /* Can't trace an ancestor if you're being traced. */
974 if (curp->p_flag & P_TRACED) {
975 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
987 /* Allow thread to clear single step for itself */
988 if (td->td_tid == tid)
994 * Check for ptrace eligibility before waiting for
997 error = proc_can_ptrace(td, p);
1002 * Block parallel ptrace requests. Most important, do
1003 * not allow other thread in debugger to continue the
1004 * debuggee until coredump finished.
1006 while ((p->p_flag2 & P2_PTRACEREQ) != 0) {
1007 if (proctree_locked)
1008 sx_xunlock(&proctree_lock);
1009 error = msleep(&p->p_flag2, &p->p_mtx, PPAUSE | PCATCH |
1010 (proctree_locked ? PDROP : 0), "pptrace", 0);
1011 if (proctree_locked) {
1012 sx_xlock(&proctree_lock);
1015 if (error == 0 && td2->td_proc != p)
1018 error = proc_can_ptrace(td, p);
1028 * Keep this process around and request parallel ptrace()
1029 * request to wait until we finish this request.
1031 MPASS((p->p_flag2 & P2_PTRACEREQ) == 0);
1032 p->p_flag2 |= P2_PTRACEREQ;
1037 * Actually do the requests
1040 td->td_retval[0] = 0;
1044 /* set my trace flag and "owner" so it can read/write me */
1045 proc_set_traced(p, false);
1046 if (p->p_flag & P_PPWAIT)
1047 p->p_flag |= P_PPTRACE;
1048 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
1052 /* security check done above */
1054 * It would be nice if the tracing relationship was separate
1055 * from the parent relationship but that would require
1056 * another set of links in the proc struct or for "wait"
1057 * to scan the entire proc table. To make life easier,
1058 * we just re-parent the process we're trying to trace.
1059 * The old parent is remembered so we can put things back
1062 proc_set_traced(p, true);
1063 proc_reparent(p, td->td_proc, false);
1064 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
1067 sx_xunlock(&proctree_lock);
1068 proctree_locked = false;
1069 MPASS(p->p_xthread == NULL);
1070 MPASS((p->p_flag & P_STOPPED_TRACE) == 0);
1073 * If already stopped due to a stop signal, clear the
1074 * existing stop before triggering a traced SIGSTOP.
1076 if ((p->p_flag & P_STOPPED_SIG) != 0) {
1078 p->p_flag &= ~(P_STOPPED_SIG | P_WAITED);
1079 thread_unsuspend(p);
1083 kern_psignal(p, SIGSTOP);
1087 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
1089 error = ptrace_clear_single_step(td2);
1093 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
1095 error = ptrace_single_step(td2);
1099 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
1101 td2->td_dbgflags |= TDB_SUSPEND;
1103 td2->td_flags |= TDF_NEEDSUSPCHK;
1108 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
1110 td2->td_dbgflags &= ~TDB_SUSPEND;
1113 case PT_FOLLOW_FORK:
1114 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
1115 p->p_ptevents & PTRACE_FORK ? "enabled" : "disabled",
1116 data ? "enabled" : "disabled");
1118 p->p_ptevents |= PTRACE_FORK;
1120 p->p_ptevents &= ~PTRACE_FORK;
1124 CTR3(KTR_PTRACE, "PT_LWP_EVENTS: pid %d %s -> %s", p->p_pid,
1125 p->p_ptevents & PTRACE_LWP ? "enabled" : "disabled",
1126 data ? "enabled" : "disabled");
1128 p->p_ptevents |= PTRACE_LWP;
1130 p->p_ptevents &= ~PTRACE_LWP;
1133 case PT_GET_EVENT_MASK:
1134 if (data != sizeof(p->p_ptevents)) {
1138 CTR2(KTR_PTRACE, "PT_GET_EVENT_MASK: pid %d mask %#x", p->p_pid,
1140 *(int *)addr = p->p_ptevents;
1143 case PT_SET_EVENT_MASK:
1144 if (data != sizeof(p->p_ptevents)) {
1149 if ((tmp & ~(PTRACE_EXEC | PTRACE_SCE | PTRACE_SCX |
1150 PTRACE_FORK | PTRACE_LWP | PTRACE_VFORK)) != 0) {
1154 CTR3(KTR_PTRACE, "PT_SET_EVENT_MASK: pid %d mask %#x -> %#x",
1155 p->p_pid, p->p_ptevents, tmp);
1156 p->p_ptevents = tmp;
1159 case PT_GET_SC_ARGS:
1160 CTR1(KTR_PTRACE, "PT_GET_SC_ARGS: pid %d", p->p_pid);
1161 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) == 0
1162 #ifdef COMPAT_FREEBSD32
1163 || (wrap32 && !safe)
1169 bzero(addr, sizeof(td2->td_sa.args));
1170 /* See the explanation in linux_ptrace_get_syscall_info(). */
1171 bcopy(td2->td_sa.args, addr, SV_PROC_ABI(td->td_proc) ==
1172 SV_ABI_LINUX ? sizeof(td2->td_sa.args) :
1173 td2->td_sa.callp->sy_narg * sizeof(register_t));
1177 if ((td2->td_dbgflags & (TDB_SCX)) == 0
1178 #ifdef COMPAT_FREEBSD32
1179 || (wrap32 && !safe)
1186 bzero(psr, sizeof(*psr));
1187 psr->sr_error = td2->td_errno;
1188 if (psr->sr_error == 0) {
1189 psr->sr_retval[0] = td2->td_retval[0];
1190 psr->sr_retval[1] = td2->td_retval[1];
1193 "PT_GET_SC_RET: pid %d error %d retval %#lx,%#lx",
1194 p->p_pid, psr->sr_error, psr->sr_retval[0],
1204 /* Zero means do not send any signal */
1205 if (data < 0 || data > _SIG_MAXSIG) {
1212 CTR3(KTR_PTRACE, "PT_STEP: tid %d (pid %d), sig = %d",
1213 td2->td_tid, p->p_pid, data);
1214 error = ptrace_single_step(td2);
1222 if (addr != (void *)1) {
1223 error = ptrace_set_pc(td2,
1224 (u_long)(uintfptr_t)addr);
1230 p->p_ptevents |= PTRACE_SCE;
1232 "PT_TO_SCE: pid %d, events = %#x, PC = %#lx, sig = %d",
1233 p->p_pid, p->p_ptevents,
1234 (u_long)(uintfptr_t)addr, data);
1237 p->p_ptevents |= PTRACE_SCX;
1239 "PT_TO_SCX: pid %d, events = %#x, PC = %#lx, sig = %d",
1240 p->p_pid, p->p_ptevents,
1241 (u_long)(uintfptr_t)addr, data);
1244 p->p_ptevents |= PTRACE_SYSCALL;
1246 "PT_SYSCALL: pid %d, events = %#x, PC = %#lx, sig = %d",
1247 p->p_pid, p->p_ptevents,
1248 (u_long)(uintfptr_t)addr, data);
1252 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
1253 p->p_pid, (u_long)(uintfptr_t)addr, data);
1259 * Clear P_TRACED before reparenting
1260 * a detached process back to its original
1261 * parent. Otherwise the debugee will be set
1262 * as an orphan of the debugger.
1264 p->p_flag &= ~(P_TRACED | P_WAITED);
1267 * Reset the process parent.
1269 if (p->p_oppid != p->p_pptr->p_pid) {
1270 PROC_LOCK(p->p_pptr);
1271 sigqueue_take(p->p_ksi);
1272 PROC_UNLOCK(p->p_pptr);
1274 pp = proc_realparent(p);
1275 proc_reparent(p, pp, false);
1277 p->p_sigparent = SIGCHLD;
1279 "PT_DETACH: pid %d reparented to pid %d, sig %d",
1280 p->p_pid, pp->p_pid, data);
1282 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
1287 FOREACH_THREAD_IN_PROC(p, td3) {
1288 if ((td3->td_dbgflags & TDB_FSTP) != 0) {
1289 sigqueue_delete(&td3->td_sigqueue,
1292 td3->td_dbgflags &= ~(TDB_XSIG | TDB_FSTP |
1296 if ((p->p_flag2 & P2_PTRACE_FSTP) != 0) {
1297 sigqueue_delete(&p->p_sigqueue, SIGSTOP);
1298 p->p_flag2 &= ~P2_PTRACE_FSTP;
1301 /* should we send SIGCHLD? */
1302 /* childproc_continued(p); */
1306 sx_xunlock(&proctree_lock);
1307 proctree_locked = false;
1310 MPASS(!proctree_locked);
1313 * Clear the pending event for the thread that just
1314 * reported its event (p_xthread). This may not be
1315 * the thread passed to PT_CONTINUE, PT_STEP, etc. if
1316 * the debugger is resuming a different thread.
1318 * Deliver any pending signal via the reporting thread.
1320 MPASS(p->p_xthread != NULL);
1321 p->p_xthread->td_dbgflags &= ~TDB_XSIG;
1322 p->p_xthread->td_xsig = data;
1323 p->p_xthread = NULL;
1327 * P_WKILLED is insurance that a PT_KILL/SIGKILL
1328 * always works immediately, even if another thread is
1329 * unsuspended first and attempts to handle a
1330 * different signal or if the POSIX.1b style signal
1331 * queue cannot accommodate any new signals.
1333 if (data == SIGKILL)
1337 * Unsuspend all threads. To leave a thread
1338 * suspended, use PT_SUSPEND to suspend it before
1339 * continuing the process.
1341 ptrace_unsuspend(p);
1346 td2->td_dbgflags |= TDB_USERWR;
1349 if (proc_writemem(td, p, (off_t)(uintptr_t)addr, &data,
1350 sizeof(int)) != sizeof(int))
1353 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1354 p->p_pid, addr, data);
1362 if (proc_readmem(td, p, (off_t)(uintptr_t)addr, &tmp,
1363 sizeof(int)) != sizeof(int))
1366 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1367 p->p_pid, addr, tmp);
1368 td->td_retval[0] = tmp;
1374 iov.iov_base = piod->piod_addr;
1375 iov.iov_len = piod->piod_len;
1376 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1377 uio.uio_resid = piod->piod_len;
1380 uio.uio_segflg = UIO_USERSPACE;
1382 switch (piod->piod_op) {
1385 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1386 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1387 uio.uio_rw = UIO_READ;
1391 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1392 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1393 td2->td_dbgflags |= TDB_USERWR;
1394 uio.uio_rw = UIO_WRITE;
1401 error = proc_rwmem(p, &uio);
1402 piod->piod_len -= uio.uio_resid;
1407 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1409 goto sendsig; /* in PT_CONTINUE above */
1412 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1414 td2->td_dbgflags |= TDB_USERWR;
1415 error = PROC_WRITE(regs, td2, addr);
1419 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1421 error = PROC_READ(regs, td2, addr);
1425 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1427 td2->td_dbgflags |= TDB_USERWR;
1428 error = PROC_WRITE(fpregs, td2, addr);
1432 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1434 error = PROC_READ(fpregs, td2, addr);
1438 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1440 td2->td_dbgflags |= TDB_USERWR;
1441 error = PROC_WRITE(dbregs, td2, addr);
1445 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1447 error = PROC_READ(dbregs, td2, addr);
1451 CTR2(KTR_PTRACE, "PT_SETREGSET: tid %d (pid %d)", td2->td_tid,
1453 error = proc_write_regset(td2, data, addr);
1457 CTR2(KTR_PTRACE, "PT_GETREGSET: tid %d (pid %d)", td2->td_tid,
1459 error = proc_read_regset(td2, data, addr);
1463 if (data <= 0 || data > sizeof(*pl)) {
1468 bzero(pl, sizeof(*pl));
1469 pl->pl_lwpid = td2->td_tid;
1470 pl->pl_event = PL_EVENT_NONE;
1472 if (td2->td_dbgflags & TDB_XSIG) {
1473 pl->pl_event = PL_EVENT_SIGNAL;
1474 if (td2->td_si.si_signo != 0 &&
1475 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1476 + sizeof(pl->pl_siginfo)){
1477 pl->pl_flags |= PL_FLAG_SI;
1478 pl->pl_siginfo = td2->td_si;
1481 if (td2->td_dbgflags & TDB_SCE)
1482 pl->pl_flags |= PL_FLAG_SCE;
1483 else if (td2->td_dbgflags & TDB_SCX)
1484 pl->pl_flags |= PL_FLAG_SCX;
1485 if (td2->td_dbgflags & TDB_EXEC)
1486 pl->pl_flags |= PL_FLAG_EXEC;
1487 if (td2->td_dbgflags & TDB_FORK) {
1488 pl->pl_flags |= PL_FLAG_FORKED;
1489 pl->pl_child_pid = td2->td_dbg_forked;
1490 if (td2->td_dbgflags & TDB_VFORK)
1491 pl->pl_flags |= PL_FLAG_VFORKED;
1492 } else if ((td2->td_dbgflags & (TDB_SCX | TDB_VFORK)) ==
1494 pl->pl_flags |= PL_FLAG_VFORK_DONE;
1495 if (td2->td_dbgflags & TDB_CHILD)
1496 pl->pl_flags |= PL_FLAG_CHILD;
1497 if (td2->td_dbgflags & TDB_BORN)
1498 pl->pl_flags |= PL_FLAG_BORN;
1499 if (td2->td_dbgflags & TDB_EXIT)
1500 pl->pl_flags |= PL_FLAG_EXITED;
1501 pl->pl_sigmask = td2->td_sigmask;
1502 pl->pl_siglist = td2->td_siglist;
1503 strcpy(pl->pl_tdname, td2->td_name);
1504 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1505 pl->pl_syscall_code = td2->td_sa.code;
1506 pl->pl_syscall_narg = td2->td_sa.callp->sy_narg;
1508 pl->pl_syscall_code = 0;
1509 pl->pl_syscall_narg = 0;
1512 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1513 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1514 pl->pl_child_pid, pl->pl_syscall_code);
1518 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1520 td->td_retval[0] = p->p_numthreads;
1524 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1525 p->p_pid, data, p->p_numthreads);
1530 num = imin(p->p_numthreads, data);
1532 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1535 FOREACH_THREAD_IN_PROC(p, td2) {
1538 buf[tmp++] = td2->td_tid;
1541 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1544 td->td_retval[0] = tmp;
1548 case PT_VM_TIMESTAMP:
1549 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1550 p->p_pid, p->p_vmspace->vm_map.timestamp);
1551 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1556 error = ptrace_vm_entry(td, p, addr);
1562 CTR2(KTR_PTRACE, "PT_COREDUMP: pid %d, fd %d",
1563 p->p_pid, pc->pc_fd);
1565 if ((pc->pc_flags & ~(PC_COMPRESS | PC_ALL)) != 0) {
1571 tcq = malloc(sizeof(*tcq), M_TEMP, M_WAITOK | M_ZERO);
1573 error = fget_write(td, pc->pc_fd, &cap_write_rights, &fp);
1575 goto coredump_cleanup_nofp;
1576 if (fp->f_type != DTYPE_VNODE || fp->f_vnode->v_type != VREG) {
1578 goto coredump_cleanup;
1582 error = proc_can_ptrace(td, p);
1584 goto coredump_cleanup_locked;
1586 td2 = ptrace_sel_coredump_thread(p);
1589 goto coredump_cleanup_locked;
1591 KASSERT((td2->td_dbgflags & (TDB_COREDUMPREQ |
1592 TDB_SCREMOTEREQ)) == 0,
1593 ("proc %d tid %d req coredump", p->p_pid, td2->td_tid));
1595 tcq->tc_vp = fp->f_vnode;
1596 tcq->tc_limit = pc->pc_limit == 0 ? OFF_MAX : pc->pc_limit;
1597 tcq->tc_flags = SVC_PT_COREDUMP;
1598 if ((pc->pc_flags & PC_COMPRESS) == 0)
1599 tcq->tc_flags |= SVC_NOCOMPRESS;
1600 if ((pc->pc_flags & PC_ALL) != 0)
1601 tcq->tc_flags |= SVC_ALL;
1602 td2->td_remotereq = tcq;
1603 td2->td_dbgflags |= TDB_COREDUMPREQ;
1604 thread_run_flash(td2);
1605 while ((td2->td_dbgflags & TDB_COREDUMPREQ) != 0)
1606 msleep(p, &p->p_mtx, PPAUSE, "crdmp", 0);
1607 error = tcq->tc_error;
1608 coredump_cleanup_locked:
1612 coredump_cleanup_nofp:
1619 CTR2(KTR_PTRACE, "PT_SC_REMOTE: pid %d, syscall %d",
1620 p->p_pid, pscr->pscr_syscall);
1621 if ((td2->td_dbgflags & TDB_BOUNDARY) == 0) {
1626 MPASS(pscr->pscr_nargs <= nitems(td->td_sa.args));
1628 tsr = malloc(sizeof(struct thr_syscall_req), M_TEMP,
1631 tsr->ts_sa.code = pscr->pscr_syscall;
1632 tsr->ts_nargs = pscr->pscr_nargs;
1633 memcpy(&tsr->ts_sa.args, pscr->pscr_args,
1634 sizeof(register_t) * tsr->ts_nargs);
1637 error = proc_can_ptrace(td, p);
1642 if (td2->td_proc != p) {
1647 KASSERT((td2->td_dbgflags & (TDB_COREDUMPREQ |
1648 TDB_SCREMOTEREQ)) == 0,
1649 ("proc %d tid %d req coredump", p->p_pid, td2->td_tid));
1651 td2->td_remotereq = tsr;
1652 td2->td_dbgflags |= TDB_SCREMOTEREQ;
1653 thread_run_flash(td2);
1654 while ((td2->td_dbgflags & TDB_SCREMOTEREQ) != 0)
1655 msleep(p, &p->p_mtx, PPAUSE, "pscrx", 0);
1657 memcpy(&pscr->pscr_ret, &tsr->ts_ret, sizeof(tsr->ts_ret));
1662 #ifdef __HAVE_PTRACE_MACHDEP
1663 if (req >= PT_FIRSTMACH) {
1665 error = cpu_ptrace(td2, req, addr, data);
1669 /* Unknown request. */
1674 /* Drop our hold on this process now that the request has completed. */
1678 if ((p->p_flag2 & P2_PTRACEREQ) != 0)
1679 wakeup(&p->p_flag2);
1680 p->p_flag2 &= ~P2_PTRACEREQ;
1683 if (proctree_locked)
1684 sx_xunlock(&proctree_lock);