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 pid_t pl_child_pid; /* New child pid */
99 u_int pl_syscall_code;
100 u_int pl_syscall_narg;
106 * Functions implemented using PROC_ACTION():
108 * proc_read_regs(proc, regs)
109 * Get the current user-visible register set from the process
110 * and copy it into the regs structure (<machine/reg.h>).
111 * The process is stopped at the time read_regs is called.
113 * proc_write_regs(proc, regs)
114 * Update the current register set from the passed in regs
115 * structure. Take care to avoid clobbering special CPU
116 * registers or privileged bits in the PSL.
117 * Depending on the architecture this may have fix-up work to do,
118 * especially if the IAR or PCW are modified.
119 * The process is stopped at the time write_regs is called.
121 * proc_read_fpregs, proc_write_fpregs
122 * deal with the floating point register set, otherwise as above.
124 * proc_read_dbregs, proc_write_dbregs
125 * deal with the processor debug register set, otherwise as above.
128 * Arrange for the process to trap after executing a single instruction.
131 #define PROC_ACTION(action) do { \
134 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
135 if ((td->td_proc->p_flag & P_INMEM) == 0) \
143 proc_read_regs(struct thread *td, struct reg *regs)
146 PROC_ACTION(fill_regs(td, regs));
150 proc_write_regs(struct thread *td, struct reg *regs)
153 PROC_ACTION(set_regs(td, regs));
157 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
160 PROC_ACTION(fill_dbregs(td, dbregs));
164 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
167 PROC_ACTION(set_dbregs(td, dbregs));
171 * Ptrace doesn't support fpregs at all, and there are no security holes
172 * or translations for fpregs, so we can just copy them.
175 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
178 PROC_ACTION(fill_fpregs(td, fpregs));
182 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
185 PROC_ACTION(set_fpregs(td, fpregs));
188 #ifdef COMPAT_FREEBSD32
189 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
191 proc_read_regs32(struct thread *td, struct reg32 *regs32)
194 PROC_ACTION(fill_regs32(td, regs32));
198 proc_write_regs32(struct thread *td, struct reg32 *regs32)
201 PROC_ACTION(set_regs32(td, regs32));
205 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
208 PROC_ACTION(fill_dbregs32(td, dbregs32));
212 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
215 PROC_ACTION(set_dbregs32(td, dbregs32));
219 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
222 PROC_ACTION(fill_fpregs32(td, fpregs32));
226 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
229 PROC_ACTION(set_fpregs32(td, fpregs32));
234 proc_sstep(struct thread *td)
237 PROC_ACTION(ptrace_single_step(td));
241 proc_rwmem(struct proc *p, struct uio *uio)
244 vm_offset_t pageno; /* page number */
246 int error, fault_flags, page_offset, writing;
249 * Assert that someone has locked this vmspace. (Should be
250 * curthread but we can't assert that.) This keeps the process
251 * from exiting out from under us until this operation completes.
253 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
259 map = &p->p_vmspace->vm_map;
262 * If we are writing, then we request vm_fault() to create a private
263 * copy of each page. Since these copies will not be writeable by the
264 * process, we must explicity request that they be dirtied.
266 writing = uio->uio_rw == UIO_WRITE;
267 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
268 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
271 * Only map in one page at a time. We don't have to, but it
272 * makes things easier. This way is trivial - right?
279 uva = (vm_offset_t)uio->uio_offset;
282 * Get the page number of this segment.
284 pageno = trunc_page(uva);
285 page_offset = uva - pageno;
288 * How many bytes to copy
290 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
293 * Fault and hold the page on behalf of the process.
295 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
296 if (error != KERN_SUCCESS) {
297 if (error == KERN_RESOURCE_SHORTAGE)
305 * Now do the i/o move.
307 error = uiomove_fromphys(&m, page_offset, len, uio);
309 /* Make the I-cache coherent for breakpoints. */
310 if (writing && error == 0) {
311 vm_map_lock_read(map);
312 if (vm_map_check_protection(map, pageno, pageno +
313 PAGE_SIZE, VM_PROT_EXECUTE))
314 vm_sync_icache(map, uva, len);
315 vm_map_unlock_read(map);
325 } while (error == 0 && uio->uio_resid > 0);
331 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
335 vm_map_entry_t entry;
336 vm_object_t obj, tobj, lobj;
339 char *freepath, *fullpath;
346 vm = vmspace_acquire_ref(p);
348 vm_map_lock_read(map);
351 entry = map->header.next;
353 while (index < pve->pve_entry && entry != &map->header) {
357 if (index != pve->pve_entry) {
361 while (entry != &map->header &&
362 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
366 if (entry == &map->header) {
371 /* We got an entry. */
372 pve->pve_entry = index + 1;
373 pve->pve_timestamp = map->timestamp;
374 pve->pve_start = entry->start;
375 pve->pve_end = entry->end - 1;
376 pve->pve_offset = entry->offset;
377 pve->pve_prot = entry->protection;
379 /* Backing object's path needed? */
380 if (pve->pve_pathlen == 0)
383 pathlen = pve->pve_pathlen;
384 pve->pve_pathlen = 0;
386 obj = entry->object.vm_object;
388 VM_OBJECT_RLOCK(obj);
391 vm_map_unlock_read(map);
394 pve->pve_fsid = VNOVAL;
395 pve->pve_fileid = VNOVAL;
397 if (error == 0 && obj != NULL) {
399 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
401 VM_OBJECT_RLOCK(tobj);
403 VM_OBJECT_RUNLOCK(lobj);
405 pve->pve_offset += tobj->backing_object_offset;
407 vp = vm_object_vnode(lobj);
411 VM_OBJECT_RUNLOCK(lobj);
412 VM_OBJECT_RUNLOCK(obj);
417 vn_fullpath(td, vp, &fullpath, &freepath);
418 vn_lock(vp, LK_SHARED | LK_RETRY);
419 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
420 pve->pve_fileid = vattr.va_fileid;
421 pve->pve_fsid = vattr.va_fsid;
425 if (fullpath != NULL) {
426 pve->pve_pathlen = strlen(fullpath) + 1;
427 if (pve->pve_pathlen <= pathlen) {
428 error = copyout(fullpath, pve->pve_path,
431 error = ENAMETOOLONG;
433 if (freepath != NULL)
434 free(freepath, M_TEMP);
438 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
439 p->p_pid, pve->pve_entry, pve->pve_start);
444 #ifdef COMPAT_FREEBSD32
446 ptrace_vm_entry32(struct thread *td, struct proc *p,
447 struct ptrace_vm_entry32 *pve32)
449 struct ptrace_vm_entry pve;
452 pve.pve_entry = pve32->pve_entry;
453 pve.pve_pathlen = pve32->pve_pathlen;
454 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
456 error = ptrace_vm_entry(td, p, &pve);
458 pve32->pve_entry = pve.pve_entry;
459 pve32->pve_timestamp = pve.pve_timestamp;
460 pve32->pve_start = pve.pve_start;
461 pve32->pve_end = pve.pve_end;
462 pve32->pve_offset = pve.pve_offset;
463 pve32->pve_prot = pve.pve_prot;
464 pve32->pve_fileid = pve.pve_fileid;
465 pve32->pve_fsid = pve.pve_fsid;
468 pve32->pve_pathlen = pve.pve_pathlen;
473 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
474 struct ptrace_lwpinfo32 *pl32)
477 pl32->pl_lwpid = pl->pl_lwpid;
478 pl32->pl_event = pl->pl_event;
479 pl32->pl_flags = pl->pl_flags;
480 pl32->pl_sigmask = pl->pl_sigmask;
481 pl32->pl_siglist = pl->pl_siglist;
482 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
483 strcpy(pl32->pl_tdname, pl->pl_tdname);
484 pl32->pl_child_pid = pl->pl_child_pid;
485 pl32->pl_syscall_code = pl->pl_syscall_code;
486 pl32->pl_syscall_narg = pl->pl_syscall_narg;
488 #endif /* COMPAT_FREEBSD32 */
491 * Process debugging system call.
493 #ifndef _SYS_SYSPROTO_H_
502 #ifdef COMPAT_FREEBSD32
504 * This CPP subterfuge is to try and reduce the number of ifdefs in
505 * the body of the code.
506 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
508 * copyin(uap->addr, &r.reg, sizeof r.reg);
510 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
511 * .. except this is done at runtime.
513 #define COPYIN(u, k, s) wrap32 ? \
514 copyin(u, k ## 32, s ## 32) : \
516 #define COPYOUT(k, u, s) wrap32 ? \
517 copyout(k ## 32, u, s ## 32) : \
520 #define COPYIN(u, k, s) copyin(u, k, s)
521 #define COPYOUT(k, u, s) copyout(k, u, s)
524 sys_ptrace(struct thread *td, struct ptrace_args *uap)
527 * XXX this obfuscation is to reduce stack usage, but the register
528 * structs may be too large to put on the stack anyway.
531 struct ptrace_io_desc piod;
532 struct ptrace_lwpinfo pl;
533 struct ptrace_vm_entry pve;
537 #ifdef COMPAT_FREEBSD32
538 struct dbreg32 dbreg32;
539 struct fpreg32 fpreg32;
541 struct ptrace_io_desc32 piod32;
542 struct ptrace_lwpinfo32 pl32;
543 struct ptrace_vm_entry32 pve32;
548 #ifdef COMPAT_FREEBSD32
551 if (SV_CURPROC_FLAG(SV_ILP32))
554 AUDIT_ARG_PID(uap->pid);
555 AUDIT_ARG_CMD(uap->req);
556 AUDIT_ARG_VALUE(uap->data);
565 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
568 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
571 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
574 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
577 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
586 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
592 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
595 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
598 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
601 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
604 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
607 error = copyout(&r.pl, uap->addr, uap->data);
616 #ifdef COMPAT_FREEBSD32
618 * PROC_READ(regs, td2, addr);
620 * proc_read_regs(td2, addr);
622 * proc_read_regs32(td2, addr);
623 * .. except this is done at runtime. There is an additional
624 * complication in that PROC_WRITE disallows 32 bit consumers
625 * from writing to 64 bit address space targets.
627 #define PROC_READ(w, t, a) wrap32 ? \
628 proc_read_ ## w ## 32(t, a) : \
629 proc_read_ ## w (t, a)
630 #define PROC_WRITE(w, t, a) wrap32 ? \
631 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
632 proc_write_ ## w (t, a)
634 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
635 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
639 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
643 struct proc *curp, *p, *pp;
644 struct thread *td2 = NULL, *td3;
645 struct ptrace_io_desc *piod = NULL;
646 struct ptrace_lwpinfo *pl;
647 int error, write, tmp, num;
648 int proctree_locked = 0;
649 lwpid_t tid = 0, *buf;
650 #ifdef COMPAT_FREEBSD32
651 int wrap32 = 0, safe = 0;
652 struct ptrace_io_desc32 *piod32 = NULL;
653 struct ptrace_lwpinfo32 *pl32 = NULL;
654 struct ptrace_lwpinfo plr;
659 /* Lock proctree before locking the process. */
670 sx_xlock(&proctree_lock);
678 if (req == PT_TRACE_ME) {
682 if (pid <= PID_MAX) {
683 if ((p = pfind(pid)) == NULL) {
685 sx_xunlock(&proctree_lock);
689 td2 = tdfind(pid, -1);
692 sx_xunlock(&proctree_lock);
700 AUDIT_ARG_PROCESS(p);
702 if ((p->p_flag & P_WEXIT) != 0) {
706 if ((error = p_cansee(td, p)) != 0)
709 if ((error = p_candebug(td, p)) != 0)
713 * System processes can't be debugged.
715 if ((p->p_flag & P_SYSTEM) != 0) {
721 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
722 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
725 td2 = FIRST_THREAD_IN_PROC(p);
730 #ifdef COMPAT_FREEBSD32
732 * Test if we're a 32 bit client and what the target is.
733 * Set the wrap controls accordingly.
735 if (SV_CURPROC_FLAG(SV_ILP32)) {
736 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
747 * Always legal, when there is a parent process which
748 * could trace us. Otherwise, reject.
750 if ((p->p_flag & P_TRACED) != 0) {
754 if (p->p_pptr == initproc) {
762 if (p == td->td_proc) {
768 if (p->p_flag & P_TRACED) {
773 /* Can't trace an ancestor if you're being traced. */
774 if (curp->p_flag & P_TRACED) {
775 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
788 /* Allow thread to clear single step for itself */
789 if (td->td_tid == tid)
794 /* not being traced... */
795 if ((p->p_flag & P_TRACED) == 0) {
800 /* not being traced by YOU */
801 if (p->p_pptr != td->td_proc) {
806 /* not currently stopped */
807 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
808 p->p_suspcount != p->p_numthreads ||
809 (p->p_flag & P_WAITED) == 0) {
814 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
815 static int count = 0;
817 printf("P_STOPPED_TRACE not set.\n");
824 /* Keep this process around until we finish this request. */
829 * Single step fixup ala procfs
835 * Actually do the requests
838 td->td_retval[0] = 0;
842 /* set my trace flag and "owner" so it can read/write me */
843 p->p_flag |= P_TRACED;
844 if (p->p_flag & P_PPWAIT)
845 p->p_flag |= P_PPTRACE;
846 p->p_oppid = p->p_pptr->p_pid;
847 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
851 /* security check done above */
853 * It would be nice if the tracing relationship was separate
854 * from the parent relationship but that would require
855 * another set of links in the proc struct or for "wait"
856 * to scan the entire proc table. To make life easier,
857 * we just re-parent the process we're trying to trace.
858 * The old parent is remembered so we can put things back
861 p->p_flag |= P_TRACED;
862 p->p_oppid = p->p_pptr->p_pid;
863 if (p->p_pptr != td->td_proc) {
864 proc_reparent(p, td->td_proc);
867 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
869 goto sendsig; /* in PT_CONTINUE below */
872 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
874 error = ptrace_clear_single_step(td2);
878 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
880 error = ptrace_single_step(td2);
884 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
886 td2->td_dbgflags |= TDB_SUSPEND;
888 td2->td_flags |= TDF_NEEDSUSPCHK;
893 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
895 td2->td_dbgflags &= ~TDB_SUSPEND;
899 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
900 p->p_flag & P_FOLLOWFORK ? "enabled" : "disabled",
901 data ? "enabled" : "disabled");
903 p->p_flag |= P_FOLLOWFORK;
905 p->p_flag &= ~P_FOLLOWFORK;
914 /* Zero means do not send any signal */
915 if (data < 0 || data > _SIG_MAXSIG) {
922 CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
923 td2->td_tid, p->p_pid);
924 error = ptrace_single_step(td2);
932 if (addr != (void *)1) {
933 error = ptrace_set_pc(td2,
934 (u_long)(uintfptr_t)addr);
940 p->p_stops |= S_PT_SCE;
942 "PT_TO_SCE: pid %d, stops = %#x, PC = %#lx, sig = %d",
943 p->p_pid, p->p_stops,
944 (u_long)(uintfptr_t)addr, data);
947 p->p_stops |= S_PT_SCX;
949 "PT_TO_SCX: pid %d, stops = %#x, PC = %#lx, sig = %d",
950 p->p_pid, p->p_stops,
951 (u_long)(uintfptr_t)addr, data);
954 p->p_stops |= S_PT_SCE | S_PT_SCX;
956 "PT_SYSCALL: pid %d, stops = %#x, PC = %#lx, sig = %d",
957 p->p_pid, p->p_stops,
958 (u_long)(uintfptr_t)addr, data);
962 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
963 p->p_pid, (u_long)(uintfptr_t)addr, data);
969 * Reset the process parent.
971 * NB: This clears P_TRACED before reparenting
972 * a detached process back to its original
973 * parent. Otherwise the debugee will be set
974 * as an orphan of the debugger.
976 p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
977 if (p->p_oppid != p->p_pptr->p_pid) {
978 PROC_LOCK(p->p_pptr);
979 sigqueue_take(p->p_ksi);
980 PROC_UNLOCK(p->p_pptr);
982 pp = proc_realparent(p);
983 proc_reparent(p, pp);
985 p->p_sigparent = SIGCHLD;
987 "PT_DETACH: pid %d reparented to pid %d, sig %d",
988 p->p_pid, pp->p_pid, data);
990 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
995 /* should we send SIGCHLD? */
996 /* childproc_continued(p); */
1001 if (proctree_locked) {
1002 sx_xunlock(&proctree_lock);
1003 proctree_locked = 0;
1006 p->p_xthread = NULL;
1007 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
1008 /* deliver or queue signal */
1009 td2->td_dbgflags &= ~TDB_XSIG;
1010 td2->td_xsig = data;
1012 if (req == PT_DETACH) {
1013 FOREACH_THREAD_IN_PROC(p, td3)
1014 td3->td_dbgflags &= ~TDB_SUSPEND;
1017 * unsuspend all threads, to not let a thread run,
1018 * you should use PT_SUSPEND to suspend it before
1019 * continuing process.
1022 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
1023 thread_unsuspend(p);
1025 if (req == PT_ATTACH)
1026 kern_psignal(p, data);
1029 kern_psignal(p, data);
1035 td2->td_dbgflags |= TDB_USERWR;
1042 /* write = 0 set above */
1043 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
1044 iov.iov_len = sizeof(int);
1047 uio.uio_offset = (off_t)(uintptr_t)addr;
1048 uio.uio_resid = sizeof(int);
1049 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */
1050 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
1052 error = proc_rwmem(p, &uio);
1053 if (uio.uio_resid != 0) {
1055 * XXX proc_rwmem() doesn't currently return ENOSPC,
1056 * so I think write() can bogusly return 0.
1057 * XXX what happens for short writes? We don't want
1058 * to write partial data.
1059 * XXX proc_rwmem() returns EPERM for other invalid
1060 * addresses. Convert this to EINVAL. Does this
1061 * clobber returns of EPERM for other reasons?
1063 if (error == 0 || error == ENOSPC || error == EPERM)
1064 error = EINVAL; /* EOF */
1067 td->td_retval[0] = tmp;
1070 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1071 p->p_pid, addr, data);
1073 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1074 p->p_pid, addr, tmp);
1080 #ifdef COMPAT_FREEBSD32
1083 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1084 iov.iov_len = piod32->piod_len;
1085 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1086 uio.uio_resid = piod32->piod_len;
1091 iov.iov_base = piod->piod_addr;
1092 iov.iov_len = piod->piod_len;
1093 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1094 uio.uio_resid = piod->piod_len;
1098 uio.uio_segflg = UIO_USERSPACE;
1100 #ifdef COMPAT_FREEBSD32
1101 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1103 tmp = piod->piod_op;
1108 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1109 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1110 uio.uio_rw = UIO_READ;
1114 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1115 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1116 td2->td_dbgflags |= TDB_USERWR;
1117 uio.uio_rw = UIO_WRITE;
1124 error = proc_rwmem(p, &uio);
1125 #ifdef COMPAT_FREEBSD32
1127 piod32->piod_len -= uio.uio_resid;
1130 piod->piod_len -= uio.uio_resid;
1135 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1137 goto sendsig; /* in PT_CONTINUE above */
1140 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1142 td2->td_dbgflags |= TDB_USERWR;
1143 error = PROC_WRITE(regs, td2, addr);
1147 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1149 error = PROC_READ(regs, td2, addr);
1153 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1155 td2->td_dbgflags |= TDB_USERWR;
1156 error = PROC_WRITE(fpregs, td2, addr);
1160 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1162 error = PROC_READ(fpregs, td2, addr);
1166 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1168 td2->td_dbgflags |= TDB_USERWR;
1169 error = PROC_WRITE(dbregs, td2, addr);
1173 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1175 error = PROC_READ(dbregs, td2, addr);
1180 #ifdef COMPAT_FREEBSD32
1181 (!wrap32 && data > sizeof(*pl)) ||
1182 (wrap32 && data > sizeof(*pl32))) {
1184 data > sizeof(*pl)) {
1189 #ifdef COMPAT_FREEBSD32
1196 pl->pl_lwpid = td2->td_tid;
1197 pl->pl_event = PL_EVENT_NONE;
1199 if (td2->td_dbgflags & TDB_XSIG) {
1200 pl->pl_event = PL_EVENT_SIGNAL;
1201 if (td2->td_dbgksi.ksi_signo != 0 &&
1202 #ifdef COMPAT_FREEBSD32
1203 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1204 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1205 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1206 pl_siginfo) + sizeof(struct siginfo32)))
1208 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1209 + sizeof(pl->pl_siginfo)
1212 pl->pl_flags |= PL_FLAG_SI;
1213 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
1216 if ((pl->pl_flags & PL_FLAG_SI) == 0)
1217 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
1218 if (td2->td_dbgflags & TDB_SCE)
1219 pl->pl_flags |= PL_FLAG_SCE;
1220 else if (td2->td_dbgflags & TDB_SCX)
1221 pl->pl_flags |= PL_FLAG_SCX;
1222 if (td2->td_dbgflags & TDB_EXEC)
1223 pl->pl_flags |= PL_FLAG_EXEC;
1224 if (td2->td_dbgflags & TDB_FORK) {
1225 pl->pl_flags |= PL_FLAG_FORKED;
1226 pl->pl_child_pid = td2->td_dbg_forked;
1228 if (td2->td_dbgflags & TDB_CHILD)
1229 pl->pl_flags |= PL_FLAG_CHILD;
1230 pl->pl_sigmask = td2->td_sigmask;
1231 pl->pl_siglist = td2->td_siglist;
1232 strcpy(pl->pl_tdname, td2->td_name);
1233 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1234 pl->pl_syscall_code = td2->td_dbg_sc_code;
1235 pl->pl_syscall_narg = td2->td_dbg_sc_narg;
1237 pl->pl_syscall_code = 0;
1238 pl->pl_syscall_narg = 0;
1240 #ifdef COMPAT_FREEBSD32
1242 ptrace_lwpinfo_to32(pl, pl32);
1245 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1246 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1247 pl->pl_child_pid, pl->pl_syscall_code);
1251 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1253 td->td_retval[0] = p->p_numthreads;
1257 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1258 p->p_pid, data, p->p_numthreads);
1263 num = imin(p->p_numthreads, data);
1265 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1268 FOREACH_THREAD_IN_PROC(p, td2) {
1271 buf[tmp++] = td2->td_tid;
1274 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1277 td->td_retval[0] = tmp;
1281 case PT_VM_TIMESTAMP:
1282 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1283 p->p_pid, p->p_vmspace->vm_map.timestamp);
1284 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1289 #ifdef COMPAT_FREEBSD32
1291 error = ptrace_vm_entry32(td, p, addr);
1294 error = ptrace_vm_entry(td, p, addr);
1299 #ifdef __HAVE_PTRACE_MACHDEP
1300 if (req >= PT_FIRSTMACH) {
1302 error = cpu_ptrace(td2, req, addr, data);
1306 /* Unknown request. */
1312 /* Drop our hold on this process now that the request has completed. */
1316 if (proctree_locked)
1317 sx_xunlock(&proctree_lock);
1324 * Stop a process because of a debugging event;
1325 * stay stopped until p->p_step is cleared
1326 * (cleared by PIOCCONT in procfs).
1329 stopevent(struct proc *p, unsigned int event, unsigned int val)
1332 PROC_LOCK_ASSERT(p, MA_OWNED);
1334 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
1338 p->p_xthread = NULL;
1339 p->p_stype = event; /* Which event caused the stop? */
1340 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1341 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1342 } while (p->p_step);