2 * Copyright (c) 1994, Sean Eric Fagan
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Sean Eric Fagan.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD$");
35 #include "opt_compat.h"
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 {
91 struct ptrace_lwpinfo32 {
92 lwpid_t pl_lwpid; /* LWP described. */
93 int pl_event; /* Event that stopped the LWP. */
94 int pl_flags; /* LWP flags. */
95 sigset_t pl_sigmask; /* LWP signal mask */
96 sigset_t pl_siglist; /* LWP pending signal */
97 struct siginfo32 pl_siginfo; /* siginfo for signal */
98 char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */
99 int pl_child_pid; /* New child pid */
100 u_int pl_syscall_code;
101 u_int pl_syscall_narg;
107 * Functions implemented using PROC_ACTION():
109 * proc_read_regs(proc, regs)
110 * Get the current user-visible register set from the process
111 * and copy it into the regs structure (<machine/reg.h>).
112 * The process is stopped at the time read_regs is called.
114 * proc_write_regs(proc, regs)
115 * Update the current register set from the passed in regs
116 * structure. Take care to avoid clobbering special CPU
117 * registers or privileged bits in the PSL.
118 * Depending on the architecture this may have fix-up work to do,
119 * especially if the IAR or PCW are modified.
120 * The process is stopped at the time write_regs is called.
122 * proc_read_fpregs, proc_write_fpregs
123 * deal with the floating point register set, otherwise as above.
125 * proc_read_dbregs, proc_write_dbregs
126 * deal with the processor debug register set, otherwise as above.
129 * Arrange for the process to trap after executing a single instruction.
132 #define PROC_ACTION(action) do { \
135 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
136 if ((td->td_proc->p_flag & P_INMEM) == 0) \
144 proc_read_regs(struct thread *td, struct reg *regs)
147 PROC_ACTION(fill_regs(td, regs));
151 proc_write_regs(struct thread *td, struct reg *regs)
154 PROC_ACTION(set_regs(td, regs));
158 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
161 PROC_ACTION(fill_dbregs(td, dbregs));
165 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
168 PROC_ACTION(set_dbregs(td, dbregs));
172 * Ptrace doesn't support fpregs at all, and there are no security holes
173 * or translations for fpregs, so we can just copy them.
176 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
179 PROC_ACTION(fill_fpregs(td, fpregs));
183 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
186 PROC_ACTION(set_fpregs(td, fpregs));
189 #ifdef COMPAT_FREEBSD32
190 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
192 proc_read_regs32(struct thread *td, struct reg32 *regs32)
195 PROC_ACTION(fill_regs32(td, regs32));
199 proc_write_regs32(struct thread *td, struct reg32 *regs32)
202 PROC_ACTION(set_regs32(td, regs32));
206 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
209 PROC_ACTION(fill_dbregs32(td, dbregs32));
213 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
216 PROC_ACTION(set_dbregs32(td, dbregs32));
220 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
223 PROC_ACTION(fill_fpregs32(td, fpregs32));
227 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
230 PROC_ACTION(set_fpregs32(td, fpregs32));
235 proc_sstep(struct thread *td)
238 PROC_ACTION(ptrace_single_step(td));
242 proc_rwmem(struct proc *p, struct uio *uio)
245 vm_offset_t pageno; /* page number */
247 int error, fault_flags, page_offset, writing;
250 * Assert that someone has locked this vmspace. (Should be
251 * curthread but we can't assert that.) This keeps the process
252 * from exiting out from under us until this operation completes.
254 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
260 map = &p->p_vmspace->vm_map;
263 * If we are writing, then we request vm_fault() to create a private
264 * copy of each page. Since these copies will not be writeable by the
265 * process, we must explicity request that they be dirtied.
267 writing = uio->uio_rw == UIO_WRITE;
268 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
269 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
272 * Only map in one page at a time. We don't have to, but it
273 * makes things easier. This way is trivial - right?
280 uva = (vm_offset_t)uio->uio_offset;
283 * Get the page number of this segment.
285 pageno = trunc_page(uva);
286 page_offset = uva - pageno;
289 * How many bytes to copy
291 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
294 * Fault and hold the page on behalf of the process.
296 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
297 if (error != KERN_SUCCESS) {
298 if (error == KERN_RESOURCE_SHORTAGE)
306 * Now do the i/o move.
308 error = uiomove_fromphys(&m, page_offset, len, uio);
310 /* Make the I-cache coherent for breakpoints. */
311 if (writing && error == 0) {
312 vm_map_lock_read(map);
313 if (vm_map_check_protection(map, pageno, pageno +
314 PAGE_SIZE, VM_PROT_EXECUTE))
315 vm_sync_icache(map, uva, len);
316 vm_map_unlock_read(map);
326 } while (error == 0 && uio->uio_resid > 0);
332 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
336 vm_map_entry_t entry;
337 vm_object_t obj, tobj, lobj;
340 char *freepath, *fullpath;
347 vm = vmspace_acquire_ref(p);
349 vm_map_lock_read(map);
352 entry = map->header.next;
354 while (index < pve->pve_entry && entry != &map->header) {
358 if (index != pve->pve_entry) {
362 while (entry != &map->header &&
363 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
367 if (entry == &map->header) {
372 /* We got an entry. */
373 pve->pve_entry = index + 1;
374 pve->pve_timestamp = map->timestamp;
375 pve->pve_start = entry->start;
376 pve->pve_end = entry->end - 1;
377 pve->pve_offset = entry->offset;
378 pve->pve_prot = entry->protection;
380 /* Backing object's path needed? */
381 if (pve->pve_pathlen == 0)
384 pathlen = pve->pve_pathlen;
385 pve->pve_pathlen = 0;
387 obj = entry->object.vm_object;
389 VM_OBJECT_RLOCK(obj);
392 vm_map_unlock_read(map);
395 pve->pve_fsid = VNOVAL;
396 pve->pve_fileid = VNOVAL;
398 if (error == 0 && obj != NULL) {
400 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
402 VM_OBJECT_RLOCK(tobj);
404 VM_OBJECT_RUNLOCK(lobj);
406 pve->pve_offset += tobj->backing_object_offset;
408 vp = vm_object_vnode(lobj);
412 VM_OBJECT_RUNLOCK(lobj);
413 VM_OBJECT_RUNLOCK(obj);
418 vn_fullpath(td, vp, &fullpath, &freepath);
419 vn_lock(vp, LK_SHARED | LK_RETRY);
420 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
421 pve->pve_fileid = vattr.va_fileid;
422 pve->pve_fsid = vattr.va_fsid;
426 if (fullpath != NULL) {
427 pve->pve_pathlen = strlen(fullpath) + 1;
428 if (pve->pve_pathlen <= pathlen) {
429 error = copyout(fullpath, pve->pve_path,
432 error = ENAMETOOLONG;
434 if (freepath != NULL)
435 free(freepath, M_TEMP);
439 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
440 p->p_pid, pve->pve_entry, pve->pve_start);
445 #ifdef COMPAT_FREEBSD32
447 ptrace_vm_entry32(struct thread *td, struct proc *p,
448 struct ptrace_vm_entry32 *pve32)
450 struct ptrace_vm_entry pve;
453 pve.pve_entry = pve32->pve_entry;
454 pve.pve_pathlen = pve32->pve_pathlen;
455 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
457 error = ptrace_vm_entry(td, p, &pve);
459 pve32->pve_entry = pve.pve_entry;
460 pve32->pve_timestamp = pve.pve_timestamp;
461 pve32->pve_start = pve.pve_start;
462 pve32->pve_end = pve.pve_end;
463 pve32->pve_offset = pve.pve_offset;
464 pve32->pve_prot = pve.pve_prot;
465 pve32->pve_fileid = pve.pve_fileid;
466 pve32->pve_fsid = pve.pve_fsid;
469 pve32->pve_pathlen = pve.pve_pathlen;
474 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
475 struct ptrace_lwpinfo32 *pl32)
478 pl32->pl_lwpid = pl->pl_lwpid;
479 pl32->pl_event = pl->pl_event;
480 pl32->pl_flags = pl->pl_flags;
481 pl32->pl_sigmask = pl->pl_sigmask;
482 pl32->pl_siglist = pl->pl_siglist;
483 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
484 strcpy(pl32->pl_tdname, pl->pl_tdname);
485 pl32->pl_child_pid = pl->pl_child_pid;
486 pl32->pl_syscall_code = pl->pl_syscall_code;
487 pl32->pl_syscall_narg = pl->pl_syscall_narg;
489 #endif /* COMPAT_FREEBSD32 */
492 * Process debugging system call.
494 #ifndef _SYS_SYSPROTO_H_
503 #ifdef COMPAT_FREEBSD32
505 * This CPP subterfuge is to try and reduce the number of ifdefs in
506 * the body of the code.
507 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
509 * copyin(uap->addr, &r.reg, sizeof r.reg);
511 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
512 * .. except this is done at runtime.
514 #define COPYIN(u, k, s) wrap32 ? \
515 copyin(u, k ## 32, s ## 32) : \
517 #define COPYOUT(k, u, s) wrap32 ? \
518 copyout(k ## 32, u, s ## 32) : \
521 #define COPYIN(u, k, s) copyin(u, k, s)
522 #define COPYOUT(k, u, s) copyout(k, u, s)
525 sys_ptrace(struct thread *td, struct ptrace_args *uap)
528 * XXX this obfuscation is to reduce stack usage, but the register
529 * structs may be too large to put on the stack anyway.
532 struct ptrace_io_desc piod;
533 struct ptrace_lwpinfo pl;
534 struct ptrace_vm_entry pve;
538 #ifdef COMPAT_FREEBSD32
539 struct dbreg32 dbreg32;
540 struct fpreg32 fpreg32;
542 struct ptrace_io_desc32 piod32;
543 struct ptrace_lwpinfo32 pl32;
544 struct ptrace_vm_entry32 pve32;
549 #ifdef COMPAT_FREEBSD32
552 if (SV_CURPROC_FLAG(SV_ILP32))
555 AUDIT_ARG_PID(uap->pid);
556 AUDIT_ARG_CMD(uap->req);
557 AUDIT_ARG_VALUE(uap->data);
566 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
569 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
572 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
575 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
578 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
587 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
593 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
596 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
599 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
602 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
605 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
608 error = copyout(&r.pl, uap->addr, uap->data);
617 #ifdef COMPAT_FREEBSD32
619 * PROC_READ(regs, td2, addr);
621 * proc_read_regs(td2, addr);
623 * proc_read_regs32(td2, addr);
624 * .. except this is done at runtime. There is an additional
625 * complication in that PROC_WRITE disallows 32 bit consumers
626 * from writing to 64 bit address space targets.
628 #define PROC_READ(w, t, a) wrap32 ? \
629 proc_read_ ## w ## 32(t, a) : \
630 proc_read_ ## w (t, a)
631 #define PROC_WRITE(w, t, a) wrap32 ? \
632 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
633 proc_write_ ## w (t, a)
635 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
636 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
640 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
644 struct proc *curp, *p, *pp;
645 struct thread *td2 = NULL, *td3;
646 struct ptrace_io_desc *piod = NULL;
647 struct ptrace_lwpinfo *pl;
648 int error, write, tmp, num;
649 int proctree_locked = 0;
650 lwpid_t tid = 0, *buf;
651 #ifdef COMPAT_FREEBSD32
652 int wrap32 = 0, safe = 0;
653 struct ptrace_io_desc32 *piod32 = NULL;
654 struct ptrace_lwpinfo32 *pl32 = NULL;
655 struct ptrace_lwpinfo plr;
660 /* Lock proctree before locking the process. */
671 sx_xlock(&proctree_lock);
679 if (req == PT_TRACE_ME) {
683 if (pid <= PID_MAX) {
684 if ((p = pfind(pid)) == NULL) {
686 sx_xunlock(&proctree_lock);
690 td2 = tdfind(pid, -1);
693 sx_xunlock(&proctree_lock);
701 AUDIT_ARG_PROCESS(p);
703 if ((p->p_flag & P_WEXIT) != 0) {
707 if ((error = p_cansee(td, p)) != 0)
710 if ((error = p_candebug(td, p)) != 0)
714 * System processes can't be debugged.
716 if ((p->p_flag & P_SYSTEM) != 0) {
722 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
723 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
726 td2 = FIRST_THREAD_IN_PROC(p);
731 #ifdef COMPAT_FREEBSD32
733 * Test if we're a 32 bit client and what the target is.
734 * Set the wrap controls accordingly.
736 if (SV_CURPROC_FLAG(SV_ILP32)) {
737 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
752 if (p->p_pid == td->td_proc->p_pid) {
758 if (p->p_flag & P_TRACED) {
763 /* Can't trace an ancestor if you're being traced. */
764 if (curp->p_flag & P_TRACED) {
765 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
778 /* Allow thread to clear single step for itself */
779 if (td->td_tid == tid)
784 /* not being traced... */
785 if ((p->p_flag & P_TRACED) == 0) {
790 /* not being traced by YOU */
791 if (p->p_pptr != td->td_proc) {
796 /* not currently stopped */
797 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
798 p->p_suspcount != p->p_numthreads ||
799 (p->p_flag & P_WAITED) == 0) {
804 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
805 static int count = 0;
807 printf("P_STOPPED_TRACE not set.\n");
814 /* Keep this process around until we finish this request. */
819 * Single step fixup ala procfs
825 * Actually do the requests
828 td->td_retval[0] = 0;
832 /* set my trace flag and "owner" so it can read/write me */
833 p->p_flag |= P_TRACED;
834 if (p->p_flag & P_PPWAIT)
835 p->p_flag |= P_PPTRACE;
836 p->p_oppid = p->p_pptr->p_pid;
837 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
841 /* security check done above */
843 * It would be nice if the tracing relationship was separate
844 * from the parent relationship but that would require
845 * another set of links in the proc struct or for "wait"
846 * to scan the entire proc table. To make life easier,
847 * we just re-parent the process we're trying to trace.
848 * The old parent is remembered so we can put things back
851 p->p_flag |= P_TRACED;
852 p->p_oppid = p->p_pptr->p_pid;
853 if (p->p_pptr != td->td_proc) {
854 proc_reparent(p, td->td_proc);
857 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
859 goto sendsig; /* in PT_CONTINUE below */
862 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
864 error = ptrace_clear_single_step(td2);
868 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
870 error = ptrace_single_step(td2);
874 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
876 td2->td_dbgflags |= TDB_SUSPEND;
878 td2->td_flags |= TDF_NEEDSUSPCHK;
883 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
885 td2->td_dbgflags &= ~TDB_SUSPEND;
889 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
890 p->p_flag & P_FOLLOWFORK ? "enabled" : "disabled",
891 data ? "enabled" : "disabled");
893 p->p_flag |= P_FOLLOWFORK;
895 p->p_flag &= ~P_FOLLOWFORK;
904 /* Zero means do not send any signal */
905 if (data < 0 || data > _SIG_MAXSIG) {
912 CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
913 td2->td_tid, p->p_pid);
914 error = ptrace_single_step(td2);
922 if (addr != (void *)1) {
923 error = ptrace_set_pc(td2,
924 (u_long)(uintfptr_t)addr);
930 p->p_stops |= S_PT_SCE;
932 "PT_TO_SCE: pid %d, stops = %#x, PC = %#lx, sig = %d",
933 p->p_pid, p->p_stops,
934 (u_long)(uintfptr_t)addr, data);
937 p->p_stops |= S_PT_SCX;
939 "PT_TO_SCX: pid %d, stops = %#x, PC = %#lx, sig = %d",
940 p->p_pid, p->p_stops,
941 (u_long)(uintfptr_t)addr, data);
944 p->p_stops |= S_PT_SCE | S_PT_SCX;
946 "PT_SYSCALL: pid %d, stops = %#x, PC = %#lx, sig = %d",
947 p->p_pid, p->p_stops,
948 (u_long)(uintfptr_t)addr, data);
952 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
953 p->p_pid, (u_long)(uintfptr_t)addr, data);
959 * Reset the process parent.
961 * NB: This clears P_TRACED before reparenting
962 * a detached process back to its original
963 * parent. Otherwise the debugee will be set
964 * as an orphan of the debugger.
966 p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
967 if (p->p_oppid != p->p_pptr->p_pid) {
968 PROC_LOCK(p->p_pptr);
969 sigqueue_take(p->p_ksi);
970 PROC_UNLOCK(p->p_pptr);
972 pp = proc_realparent(p);
973 proc_reparent(p, pp);
975 p->p_sigparent = SIGCHLD;
977 "PT_DETACH: pid %d reparented to pid %d, sig %d",
978 p->p_pid, pp->p_pid, data);
980 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
985 /* should we send SIGCHLD? */
986 /* childproc_continued(p); */
991 if (proctree_locked) {
992 sx_xunlock(&proctree_lock);
997 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
998 /* deliver or queue signal */
999 td2->td_dbgflags &= ~TDB_XSIG;
1000 td2->td_xsig = data;
1002 if (req == PT_DETACH) {
1003 FOREACH_THREAD_IN_PROC(p, td3)
1004 td3->td_dbgflags &= ~TDB_SUSPEND;
1007 * unsuspend all threads, to not let a thread run,
1008 * you should use PT_SUSPEND to suspend it before
1009 * continuing process.
1012 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
1013 thread_unsuspend(p);
1015 if (req == PT_ATTACH)
1016 kern_psignal(p, data);
1019 kern_psignal(p, data);
1025 td2->td_dbgflags |= TDB_USERWR;
1032 /* write = 0 set above */
1033 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
1034 iov.iov_len = sizeof(int);
1037 uio.uio_offset = (off_t)(uintptr_t)addr;
1038 uio.uio_resid = sizeof(int);
1039 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */
1040 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
1042 error = proc_rwmem(p, &uio);
1043 if (uio.uio_resid != 0) {
1045 * XXX proc_rwmem() doesn't currently return ENOSPC,
1046 * so I think write() can bogusly return 0.
1047 * XXX what happens for short writes? We don't want
1048 * to write partial data.
1049 * XXX proc_rwmem() returns EPERM for other invalid
1050 * addresses. Convert this to EINVAL. Does this
1051 * clobber returns of EPERM for other reasons?
1053 if (error == 0 || error == ENOSPC || error == EPERM)
1054 error = EINVAL; /* EOF */
1057 td->td_retval[0] = tmp;
1060 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1061 p->p_pid, addr, data);
1063 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1064 p->p_pid, addr, tmp);
1070 #ifdef COMPAT_FREEBSD32
1073 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1074 iov.iov_len = piod32->piod_len;
1075 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1076 uio.uio_resid = piod32->piod_len;
1081 iov.iov_base = piod->piod_addr;
1082 iov.iov_len = piod->piod_len;
1083 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1084 uio.uio_resid = piod->piod_len;
1088 uio.uio_segflg = UIO_USERSPACE;
1090 #ifdef COMPAT_FREEBSD32
1091 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1093 tmp = piod->piod_op;
1098 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1099 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1100 uio.uio_rw = UIO_READ;
1104 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1105 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1106 td2->td_dbgflags |= TDB_USERWR;
1107 uio.uio_rw = UIO_WRITE;
1114 error = proc_rwmem(p, &uio);
1115 #ifdef COMPAT_FREEBSD32
1117 piod32->piod_len -= uio.uio_resid;
1120 piod->piod_len -= uio.uio_resid;
1125 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1127 goto sendsig; /* in PT_CONTINUE above */
1130 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1132 td2->td_dbgflags |= TDB_USERWR;
1133 error = PROC_WRITE(regs, td2, addr);
1137 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1139 error = PROC_READ(regs, td2, addr);
1143 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1145 td2->td_dbgflags |= TDB_USERWR;
1146 error = PROC_WRITE(fpregs, td2, addr);
1150 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1152 error = PROC_READ(fpregs, td2, addr);
1156 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1158 td2->td_dbgflags |= TDB_USERWR;
1159 error = PROC_WRITE(dbregs, td2, addr);
1163 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1165 error = PROC_READ(dbregs, td2, addr);
1170 #ifdef COMPAT_FREEBSD32
1171 (!wrap32 && data > sizeof(*pl)) ||
1172 (wrap32 && data > sizeof(*pl32))) {
1174 data > sizeof(*pl)) {
1179 #ifdef COMPAT_FREEBSD32
1186 pl->pl_lwpid = td2->td_tid;
1187 pl->pl_event = PL_EVENT_NONE;
1189 if (td2->td_dbgflags & TDB_XSIG) {
1190 pl->pl_event = PL_EVENT_SIGNAL;
1191 if (td2->td_dbgksi.ksi_signo != 0 &&
1192 #ifdef COMPAT_FREEBSD32
1193 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1194 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1195 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1196 pl_siginfo) + sizeof(struct siginfo32)))
1198 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1199 + sizeof(pl->pl_siginfo)
1202 pl->pl_flags |= PL_FLAG_SI;
1203 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
1206 if ((pl->pl_flags & PL_FLAG_SI) == 0)
1207 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
1208 if (td2->td_dbgflags & TDB_SCE)
1209 pl->pl_flags |= PL_FLAG_SCE;
1210 else if (td2->td_dbgflags & TDB_SCX)
1211 pl->pl_flags |= PL_FLAG_SCX;
1212 if (td2->td_dbgflags & TDB_EXEC)
1213 pl->pl_flags |= PL_FLAG_EXEC;
1214 if (td2->td_dbgflags & TDB_FORK) {
1215 pl->pl_flags |= PL_FLAG_FORKED;
1216 pl->pl_child_pid = td2->td_dbg_forked;
1218 if (td2->td_dbgflags & TDB_CHILD)
1219 pl->pl_flags |= PL_FLAG_CHILD;
1220 pl->pl_sigmask = td2->td_sigmask;
1221 pl->pl_siglist = td2->td_siglist;
1222 strcpy(pl->pl_tdname, td2->td_name);
1223 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1224 pl->pl_syscall_code = td2->td_dbg_sc_code;
1225 pl->pl_syscall_narg = td2->td_dbg_sc_narg;
1227 pl->pl_syscall_code = 0;
1228 pl->pl_syscall_narg = 0;
1230 #ifdef COMPAT_FREEBSD32
1232 ptrace_lwpinfo_to32(pl, pl32);
1235 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1236 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1237 pl->pl_child_pid, pl->pl_syscall_code);
1241 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1243 td->td_retval[0] = p->p_numthreads;
1247 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1248 p->p_pid, data, p->p_numthreads);
1253 num = imin(p->p_numthreads, data);
1255 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1258 FOREACH_THREAD_IN_PROC(p, td2) {
1261 buf[tmp++] = td2->td_tid;
1264 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1267 td->td_retval[0] = tmp;
1271 case PT_VM_TIMESTAMP:
1272 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1273 p->p_pid, p->p_vmspace->vm_map.timestamp);
1274 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1279 #ifdef COMPAT_FREEBSD32
1281 error = ptrace_vm_entry32(td, p, addr);
1284 error = ptrace_vm_entry(td, p, addr);
1289 #ifdef __HAVE_PTRACE_MACHDEP
1290 if (req >= PT_FIRSTMACH) {
1292 error = cpu_ptrace(td2, req, addr, data);
1296 /* Unknown request. */
1302 /* Drop our hold on this process now that the request has completed. */
1306 if (proctree_locked)
1307 sx_xunlock(&proctree_lock);
1314 * Stop a process because of a debugging event;
1315 * stay stopped until p->p_step is cleared
1316 * (cleared by PIOCCONT in procfs).
1319 stopevent(struct proc *p, unsigned int event, unsigned int val)
1322 PROC_LOCK_ASSERT(p, MA_OWNED);
1324 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1327 if (event != S_EXIT)
1329 p->p_xthread = NULL;
1330 p->p_stype = event; /* Which event caused the stop? */
1331 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1332 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1333 } while (p->p_step);