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>
46 #include <sys/vnode.h>
47 #include <sys/ptrace.h>
48 #include <sys/rwlock.h>
50 #include <sys/malloc.h>
51 #include <sys/signalvar.h>
53 #include <machine/reg.h>
55 #include <security/audit/audit.h>
59 #include <vm/vm_extern.h>
60 #include <vm/vm_map.h>
61 #include <vm/vm_kern.h>
62 #include <vm/vm_object.h>
63 #include <vm/vm_page.h>
64 #include <vm/vm_param.h>
66 #ifdef COMPAT_FREEBSD32
67 #include <sys/procfs.h>
68 #include <compat/freebsd32/freebsd32_signal.h>
70 struct ptrace_io_desc32 {
77 struct ptrace_vm_entry32 {
90 struct ptrace_lwpinfo32 {
91 lwpid_t pl_lwpid; /* LWP described. */
92 int pl_event; /* Event that stopped the LWP. */
93 int pl_flags; /* LWP flags. */
94 sigset_t pl_sigmask; /* LWP signal mask */
95 sigset_t pl_siglist; /* LWP pending signal */
96 struct siginfo32 pl_siginfo; /* siginfo for signal */
97 char pl_tdname[MAXCOMLEN + 1]; /* LWP name. */
98 int pl_child_pid; /* New child pid */
104 * Functions implemented using PROC_ACTION():
106 * proc_read_regs(proc, regs)
107 * Get the current user-visible register set from the process
108 * and copy it into the regs structure (<machine/reg.h>).
109 * The process is stopped at the time read_regs is called.
111 * proc_write_regs(proc, regs)
112 * Update the current register set from the passed in regs
113 * structure. Take care to avoid clobbering special CPU
114 * registers or privileged bits in the PSL.
115 * Depending on the architecture this may have fix-up work to do,
116 * especially if the IAR or PCW are modified.
117 * The process is stopped at the time write_regs is called.
119 * proc_read_fpregs, proc_write_fpregs
120 * deal with the floating point register set, otherwise as above.
122 * proc_read_dbregs, proc_write_dbregs
123 * deal with the processor debug register set, otherwise as above.
126 * Arrange for the process to trap after executing a single instruction.
129 #define PROC_ACTION(action) do { \
132 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
133 if ((td->td_proc->p_flag & P_INMEM) == 0) \
141 proc_read_regs(struct thread *td, struct reg *regs)
144 PROC_ACTION(fill_regs(td, regs));
148 proc_write_regs(struct thread *td, struct reg *regs)
151 PROC_ACTION(set_regs(td, regs));
155 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
158 PROC_ACTION(fill_dbregs(td, dbregs));
162 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
165 PROC_ACTION(set_dbregs(td, dbregs));
169 * Ptrace doesn't support fpregs at all, and there are no security holes
170 * or translations for fpregs, so we can just copy them.
173 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
176 PROC_ACTION(fill_fpregs(td, fpregs));
180 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
183 PROC_ACTION(set_fpregs(td, fpregs));
186 #ifdef COMPAT_FREEBSD32
187 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
189 proc_read_regs32(struct thread *td, struct reg32 *regs32)
192 PROC_ACTION(fill_regs32(td, regs32));
196 proc_write_regs32(struct thread *td, struct reg32 *regs32)
199 PROC_ACTION(set_regs32(td, regs32));
203 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
206 PROC_ACTION(fill_dbregs32(td, dbregs32));
210 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
213 PROC_ACTION(set_dbregs32(td, dbregs32));
217 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
220 PROC_ACTION(fill_fpregs32(td, fpregs32));
224 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
227 PROC_ACTION(set_fpregs32(td, fpregs32));
232 proc_sstep(struct thread *td)
235 PROC_ACTION(ptrace_single_step(td));
239 proc_rwmem(struct proc *p, struct uio *uio)
242 vm_offset_t pageno; /* page number */
244 int error, fault_flags, page_offset, writing;
247 * Assert that someone has locked this vmspace. (Should be
248 * curthread but we can't assert that.) This keeps the process
249 * from exiting out from under us until this operation completes.
251 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
257 map = &p->p_vmspace->vm_map;
260 * If we are writing, then we request vm_fault() to create a private
261 * copy of each page. Since these copies will not be writeable by the
262 * process, we must explicity request that they be dirtied.
264 writing = uio->uio_rw == UIO_WRITE;
265 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
266 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
269 * Only map in one page at a time. We don't have to, but it
270 * makes things easier. This way is trivial - right?
277 uva = (vm_offset_t)uio->uio_offset;
280 * Get the page number of this segment.
282 pageno = trunc_page(uva);
283 page_offset = uva - pageno;
286 * How many bytes to copy
288 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
291 * Fault and hold the page on behalf of the process.
293 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
294 if (error != KERN_SUCCESS) {
295 if (error == KERN_RESOURCE_SHORTAGE)
303 * Now do the i/o move.
305 error = uiomove_fromphys(&m, page_offset, len, uio);
307 /* Make the I-cache coherent for breakpoints. */
308 if (writing && error == 0) {
309 vm_map_lock_read(map);
310 if (vm_map_check_protection(map, pageno, pageno +
311 PAGE_SIZE, VM_PROT_EXECUTE))
312 vm_sync_icache(map, uva, len);
313 vm_map_unlock_read(map);
323 } while (error == 0 && uio->uio_resid > 0);
329 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
333 vm_map_entry_t entry;
334 vm_object_t obj, tobj, lobj;
337 char *freepath, *fullpath;
344 vm = vmspace_acquire_ref(p);
346 vm_map_lock_read(map);
349 entry = map->header.next;
351 while (index < pve->pve_entry && entry != &map->header) {
355 if (index != pve->pve_entry) {
359 while (entry != &map->header &&
360 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
364 if (entry == &map->header) {
369 /* We got an entry. */
370 pve->pve_entry = index + 1;
371 pve->pve_timestamp = map->timestamp;
372 pve->pve_start = entry->start;
373 pve->pve_end = entry->end - 1;
374 pve->pve_offset = entry->offset;
375 pve->pve_prot = entry->protection;
377 /* Backing object's path needed? */
378 if (pve->pve_pathlen == 0)
381 pathlen = pve->pve_pathlen;
382 pve->pve_pathlen = 0;
384 obj = entry->object.vm_object;
386 VM_OBJECT_RLOCK(obj);
389 vm_map_unlock_read(map);
392 pve->pve_fsid = VNOVAL;
393 pve->pve_fileid = VNOVAL;
395 if (error == 0 && obj != NULL) {
397 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
399 VM_OBJECT_RLOCK(tobj);
401 VM_OBJECT_RUNLOCK(lobj);
403 pve->pve_offset += tobj->backing_object_offset;
405 vp = (lobj->type == OBJT_VNODE) ? lobj->handle : NULL;
409 VM_OBJECT_RUNLOCK(lobj);
410 VM_OBJECT_RUNLOCK(obj);
415 vn_fullpath(td, vp, &fullpath, &freepath);
416 vn_lock(vp, LK_SHARED | LK_RETRY);
417 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
418 pve->pve_fileid = vattr.va_fileid;
419 pve->pve_fsid = vattr.va_fsid;
423 if (fullpath != NULL) {
424 pve->pve_pathlen = strlen(fullpath) + 1;
425 if (pve->pve_pathlen <= pathlen) {
426 error = copyout(fullpath, pve->pve_path,
429 error = ENAMETOOLONG;
431 if (freepath != NULL)
432 free(freepath, M_TEMP);
436 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
437 p->p_pid, pve->pve_entry, pve->pve_start);
442 #ifdef COMPAT_FREEBSD32
444 ptrace_vm_entry32(struct thread *td, struct proc *p,
445 struct ptrace_vm_entry32 *pve32)
447 struct ptrace_vm_entry pve;
450 pve.pve_entry = pve32->pve_entry;
451 pve.pve_pathlen = pve32->pve_pathlen;
452 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
454 error = ptrace_vm_entry(td, p, &pve);
456 pve32->pve_entry = pve.pve_entry;
457 pve32->pve_timestamp = pve.pve_timestamp;
458 pve32->pve_start = pve.pve_start;
459 pve32->pve_end = pve.pve_end;
460 pve32->pve_offset = pve.pve_offset;
461 pve32->pve_prot = pve.pve_prot;
462 pve32->pve_fileid = pve.pve_fileid;
463 pve32->pve_fsid = pve.pve_fsid;
466 pve32->pve_pathlen = pve.pve_pathlen;
471 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
472 struct ptrace_lwpinfo32 *pl32)
475 pl32->pl_lwpid = pl->pl_lwpid;
476 pl32->pl_event = pl->pl_event;
477 pl32->pl_flags = pl->pl_flags;
478 pl32->pl_sigmask = pl->pl_sigmask;
479 pl32->pl_siglist = pl->pl_siglist;
480 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
481 strcpy(pl32->pl_tdname, pl->pl_tdname);
482 pl32->pl_child_pid = pl->pl_child_pid;
484 #endif /* COMPAT_FREEBSD32 */
487 * Process debugging system call.
489 #ifndef _SYS_SYSPROTO_H_
498 #ifdef COMPAT_FREEBSD32
500 * This CPP subterfuge is to try and reduce the number of ifdefs in
501 * the body of the code.
502 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
504 * copyin(uap->addr, &r.reg, sizeof r.reg);
506 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
507 * .. except this is done at runtime.
509 #define COPYIN(u, k, s) wrap32 ? \
510 copyin(u, k ## 32, s ## 32) : \
512 #define COPYOUT(k, u, s) wrap32 ? \
513 copyout(k ## 32, u, s ## 32) : \
516 #define COPYIN(u, k, s) copyin(u, k, s)
517 #define COPYOUT(k, u, s) copyout(k, u, s)
520 sys_ptrace(struct thread *td, struct ptrace_args *uap)
523 * XXX this obfuscation is to reduce stack usage, but the register
524 * structs may be too large to put on the stack anyway.
527 struct ptrace_io_desc piod;
528 struct ptrace_lwpinfo pl;
529 struct ptrace_vm_entry pve;
533 #ifdef COMPAT_FREEBSD32
534 struct dbreg32 dbreg32;
535 struct fpreg32 fpreg32;
537 struct ptrace_io_desc32 piod32;
538 struct ptrace_lwpinfo32 pl32;
539 struct ptrace_vm_entry32 pve32;
544 #ifdef COMPAT_FREEBSD32
547 if (SV_CURPROC_FLAG(SV_ILP32))
550 AUDIT_ARG_PID(uap->pid);
551 AUDIT_ARG_CMD(uap->req);
552 AUDIT_ARG_VALUE(uap->data);
561 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
564 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
567 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
570 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
573 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
582 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
588 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
591 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
594 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
597 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
600 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
603 error = copyout(&r.pl, uap->addr, uap->data);
612 #ifdef COMPAT_FREEBSD32
614 * PROC_READ(regs, td2, addr);
616 * proc_read_regs(td2, addr);
618 * proc_read_regs32(td2, addr);
619 * .. except this is done at runtime. There is an additional
620 * complication in that PROC_WRITE disallows 32 bit consumers
621 * from writing to 64 bit address space targets.
623 #define PROC_READ(w, t, a) wrap32 ? \
624 proc_read_ ## w ## 32(t, a) : \
625 proc_read_ ## w (t, a)
626 #define PROC_WRITE(w, t, a) wrap32 ? \
627 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
628 proc_write_ ## w (t, a)
630 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
631 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
635 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
639 struct proc *curp, *p, *pp;
640 struct thread *td2 = NULL, *td3;
641 struct ptrace_io_desc *piod = NULL;
642 struct ptrace_lwpinfo *pl;
643 int error, write, tmp, num;
644 int proctree_locked = 0;
645 lwpid_t tid = 0, *buf;
646 #ifdef COMPAT_FREEBSD32
647 int wrap32 = 0, safe = 0;
648 struct ptrace_io_desc32 *piod32 = NULL;
649 struct ptrace_lwpinfo32 *pl32 = NULL;
650 struct ptrace_lwpinfo plr;
655 /* Lock proctree before locking the process. */
666 sx_xlock(&proctree_lock);
674 if (req == PT_TRACE_ME) {
678 if (pid <= PID_MAX) {
679 if ((p = pfind(pid)) == NULL) {
681 sx_xunlock(&proctree_lock);
685 td2 = tdfind(pid, -1);
688 sx_xunlock(&proctree_lock);
696 AUDIT_ARG_PROCESS(p);
698 if ((p->p_flag & P_WEXIT) != 0) {
702 if ((error = p_cansee(td, p)) != 0)
705 if ((error = p_candebug(td, p)) != 0)
709 * System processes can't be debugged.
711 if ((p->p_flag & P_SYSTEM) != 0) {
717 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
718 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
721 td2 = FIRST_THREAD_IN_PROC(p);
726 #ifdef COMPAT_FREEBSD32
728 * Test if we're a 32 bit client and what the target is.
729 * Set the wrap controls accordingly.
731 if (SV_CURPROC_FLAG(SV_ILP32)) {
732 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
747 if (p->p_pid == td->td_proc->p_pid) {
753 if (p->p_flag & P_TRACED) {
758 /* Can't trace an ancestor if you're being traced. */
759 if (curp->p_flag & P_TRACED) {
760 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
773 /* Allow thread to clear single step for itself */
774 if (td->td_tid == tid)
779 /* not being traced... */
780 if ((p->p_flag & P_TRACED) == 0) {
785 /* not being traced by YOU */
786 if (p->p_pptr != td->td_proc) {
791 /* not currently stopped */
792 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
793 p->p_suspcount != p->p_numthreads ||
794 (p->p_flag & P_WAITED) == 0) {
799 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
800 static int count = 0;
802 printf("P_STOPPED_TRACE not set.\n");
809 /* Keep this process around until we finish this request. */
814 * Single step fixup ala procfs
820 * Actually do the requests
823 td->td_retval[0] = 0;
827 /* set my trace flag and "owner" so it can read/write me */
828 p->p_flag |= P_TRACED;
829 if (p->p_flag & P_PPWAIT)
830 p->p_flag |= P_PPTRACE;
831 p->p_oppid = p->p_pptr->p_pid;
832 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
836 /* security check done above */
838 * It would be nice if the tracing relationship was separate
839 * from the parent relationship but that would require
840 * another set of links in the proc struct or for "wait"
841 * to scan the entire proc table. To make life easier,
842 * we just re-parent the process we're trying to trace.
843 * The old parent is remembered so we can put things back
846 p->p_flag |= P_TRACED;
847 p->p_oppid = p->p_pptr->p_pid;
848 if (p->p_pptr != td->td_proc) {
849 proc_reparent(p, td->td_proc);
852 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
854 goto sendsig; /* in PT_CONTINUE below */
857 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
859 error = ptrace_clear_single_step(td2);
863 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
865 error = ptrace_single_step(td2);
869 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
871 td2->td_dbgflags |= TDB_SUSPEND;
873 td2->td_flags |= TDF_NEEDSUSPCHK;
878 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
880 td2->td_dbgflags &= ~TDB_SUSPEND;
884 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
885 p->p_flag & P_FOLLOWFORK ? "enabled" : "disabled",
886 data ? "enabled" : "disabled");
888 p->p_flag |= P_FOLLOWFORK;
890 p->p_flag &= ~P_FOLLOWFORK;
899 /* Zero means do not send any signal */
900 if (data < 0 || data > _SIG_MAXSIG) {
907 CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
908 td2->td_tid, p->p_pid);
909 error = ptrace_single_step(td2);
917 if (addr != (void *)1) {
918 error = ptrace_set_pc(td2,
919 (u_long)(uintfptr_t)addr);
925 p->p_stops |= S_PT_SCE;
927 "PT_TO_SCE: pid %d, stops = %#x", p->p_pid,
931 p->p_stops |= S_PT_SCX;
933 "PT_TO_SCX: pid %d, stops = %#x", p->p_pid,
937 p->p_stops |= S_PT_SCE | S_PT_SCX;
939 "PT_SYSCALL: pid %d, stops = %#x", p->p_pid,
944 "PT_CONTINUE: pid %d", p->p_pid);
949 /* reset process parent */
950 if (p->p_oppid != p->p_pptr->p_pid) {
951 PROC_LOCK(p->p_pptr);
952 sigqueue_take(p->p_ksi);
953 PROC_UNLOCK(p->p_pptr);
955 pp = proc_realparent(p);
956 proc_reparent(p, pp);
958 p->p_sigparent = SIGCHLD;
960 "PT_DETACH: pid %d reparented to pid %d",
961 p->p_pid, pp->p_pid);
963 CTR1(KTR_PTRACE, "PT_DETACH: pid %d", p->p_pid);
965 p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
968 /* should we send SIGCHLD? */
969 /* childproc_continued(p); */
974 if (proctree_locked) {
975 sx_xunlock(&proctree_lock);
980 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
981 /* deliver or queue signal */
982 td2->td_dbgflags &= ~TDB_XSIG;
985 if (req == PT_DETACH) {
986 FOREACH_THREAD_IN_PROC(p, td3)
987 td3->td_dbgflags &= ~TDB_SUSPEND;
990 * unsuspend all threads, to not let a thread run,
991 * you should use PT_SUSPEND to suspend it before
992 * continuing process.
995 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
998 if (req == PT_ATTACH)
999 kern_psignal(p, data);
1002 kern_psignal(p, data);
1008 td2->td_dbgflags |= TDB_USERWR;
1015 /* write = 0 set above */
1016 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
1017 iov.iov_len = sizeof(int);
1020 uio.uio_offset = (off_t)(uintptr_t)addr;
1021 uio.uio_resid = sizeof(int);
1022 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */
1023 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
1025 error = proc_rwmem(p, &uio);
1026 if (uio.uio_resid != 0) {
1028 * XXX proc_rwmem() doesn't currently return ENOSPC,
1029 * so I think write() can bogusly return 0.
1030 * XXX what happens for short writes? We don't want
1031 * to write partial data.
1032 * XXX proc_rwmem() returns EPERM for other invalid
1033 * addresses. Convert this to EINVAL. Does this
1034 * clobber returns of EPERM for other reasons?
1036 if (error == 0 || error == ENOSPC || error == EPERM)
1037 error = EINVAL; /* EOF */
1040 td->td_retval[0] = tmp;
1043 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1044 p->p_pid, addr, data);
1046 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1047 p->p_pid, addr, tmp);
1053 #ifdef COMPAT_FREEBSD32
1056 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1057 iov.iov_len = piod32->piod_len;
1058 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1059 uio.uio_resid = piod32->piod_len;
1064 iov.iov_base = piod->piod_addr;
1065 iov.iov_len = piod->piod_len;
1066 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1067 uio.uio_resid = piod->piod_len;
1071 uio.uio_segflg = UIO_USERSPACE;
1073 #ifdef COMPAT_FREEBSD32
1074 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1076 tmp = piod->piod_op;
1081 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1082 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1083 uio.uio_rw = UIO_READ;
1087 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1088 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1089 td2->td_dbgflags |= TDB_USERWR;
1090 uio.uio_rw = UIO_WRITE;
1097 error = proc_rwmem(p, &uio);
1098 #ifdef COMPAT_FREEBSD32
1100 piod32->piod_len -= uio.uio_resid;
1103 piod->piod_len -= uio.uio_resid;
1108 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1110 goto sendsig; /* in PT_CONTINUE above */
1113 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1115 td2->td_dbgflags |= TDB_USERWR;
1116 error = PROC_WRITE(regs, td2, addr);
1120 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1122 error = PROC_READ(regs, td2, addr);
1126 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1128 td2->td_dbgflags |= TDB_USERWR;
1129 error = PROC_WRITE(fpregs, td2, addr);
1133 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1135 error = PROC_READ(fpregs, td2, addr);
1139 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1141 td2->td_dbgflags |= TDB_USERWR;
1142 error = PROC_WRITE(dbregs, td2, addr);
1146 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1148 error = PROC_READ(dbregs, td2, addr);
1153 #ifdef COMPAT_FREEBSD32
1154 (!wrap32 && data > sizeof(*pl)) ||
1155 (wrap32 && data > sizeof(*pl32))) {
1157 data > sizeof(*pl)) {
1162 #ifdef COMPAT_FREEBSD32
1169 pl->pl_lwpid = td2->td_tid;
1170 pl->pl_event = PL_EVENT_NONE;
1172 if (td2->td_dbgflags & TDB_XSIG) {
1173 pl->pl_event = PL_EVENT_SIGNAL;
1174 if (td2->td_dbgksi.ksi_signo != 0 &&
1175 #ifdef COMPAT_FREEBSD32
1176 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1177 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1178 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1179 pl_siginfo) + sizeof(struct siginfo32)))
1181 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1182 + sizeof(pl->pl_siginfo)
1185 pl->pl_flags |= PL_FLAG_SI;
1186 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
1189 if ((pl->pl_flags & PL_FLAG_SI) == 0)
1190 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
1191 if (td2->td_dbgflags & TDB_SCE)
1192 pl->pl_flags |= PL_FLAG_SCE;
1193 else if (td2->td_dbgflags & TDB_SCX)
1194 pl->pl_flags |= PL_FLAG_SCX;
1195 if (td2->td_dbgflags & TDB_EXEC)
1196 pl->pl_flags |= PL_FLAG_EXEC;
1197 if (td2->td_dbgflags & TDB_FORK) {
1198 pl->pl_flags |= PL_FLAG_FORKED;
1199 pl->pl_child_pid = td2->td_dbg_forked;
1201 if (td2->td_dbgflags & TDB_CHILD)
1202 pl->pl_flags |= PL_FLAG_CHILD;
1203 pl->pl_sigmask = td2->td_sigmask;
1204 pl->pl_siglist = td2->td_siglist;
1205 strcpy(pl->pl_tdname, td2->td_name);
1206 #ifdef COMPAT_FREEBSD32
1208 ptrace_lwpinfo_to32(pl, pl32);
1211 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d",
1212 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1217 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1219 td->td_retval[0] = p->p_numthreads;
1223 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1224 p->p_pid, data, p->p_numthreads);
1229 num = imin(p->p_numthreads, data);
1231 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1234 FOREACH_THREAD_IN_PROC(p, td2) {
1237 buf[tmp++] = td2->td_tid;
1240 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1243 td->td_retval[0] = tmp;
1247 case PT_VM_TIMESTAMP:
1248 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1249 p->p_pid, p->p_vmspace->vm_map.timestamp);
1250 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1255 #ifdef COMPAT_FREEBSD32
1257 error = ptrace_vm_entry32(td, p, addr);
1260 error = ptrace_vm_entry(td, p, addr);
1265 #ifdef __HAVE_PTRACE_MACHDEP
1266 if (req >= PT_FIRSTMACH) {
1268 error = cpu_ptrace(td2, req, addr, data);
1272 /* Unknown request. */
1278 /* Drop our hold on this process now that the request has completed. */
1282 if (proctree_locked)
1283 sx_xunlock(&proctree_lock);
1290 * Stop a process because of a debugging event;
1291 * stay stopped until p->p_step is cleared
1292 * (cleared by PIOCCONT in procfs).
1295 stopevent(struct proc *p, unsigned int event, unsigned int val)
1298 PROC_LOCK_ASSERT(p, MA_OWNED);
1300 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1304 p->p_xthread = NULL;
1305 p->p_stype = event; /* Which event caused the stop? */
1306 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1307 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1308 } while (p->p_step);