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/procctl.h>
47 #include <sys/vnode.h>
48 #include <sys/ptrace.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_pager.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 pid_t 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;
342 int error, index, vfslocked;
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;
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_LOCK(tobj);
404 VM_OBJECT_UNLOCK(lobj);
406 pve->pve_offset += tobj->backing_object_offset;
408 vp = (lobj->type == OBJT_VNODE) ? lobj->handle : NULL;
412 VM_OBJECT_UNLOCK(lobj);
413 VM_OBJECT_UNLOCK(obj);
418 vn_fullpath(td, vp, &fullpath, &freepath);
419 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
420 vn_lock(vp, LK_SHARED | LK_RETRY);
421 if (VOP_GETATTR(vp, &vattr, td->td_ucred) == 0) {
422 pve->pve_fileid = vattr.va_fileid;
423 pve->pve_fsid = vattr.va_fsid;
426 VFS_UNLOCK_GIANT(vfslocked);
428 if (fullpath != NULL) {
429 pve->pve_pathlen = strlen(fullpath) + 1;
430 if (pve->pve_pathlen <= pathlen) {
431 error = copyout(fullpath, pve->pve_path,
434 error = ENAMETOOLONG;
436 if (freepath != NULL)
437 free(freepath, M_TEMP);
441 CTR3(KTR_PTRACE, "PT_VM_ENTRY: pid %d, entry %d, start %p",
442 p->p_pid, pve->pve_entry, pve->pve_start);
447 #ifdef COMPAT_FREEBSD32
449 ptrace_vm_entry32(struct thread *td, struct proc *p,
450 struct ptrace_vm_entry32 *pve32)
452 struct ptrace_vm_entry pve;
455 pve.pve_entry = pve32->pve_entry;
456 pve.pve_pathlen = pve32->pve_pathlen;
457 pve.pve_path = (void *)(uintptr_t)pve32->pve_path;
459 error = ptrace_vm_entry(td, p, &pve);
461 pve32->pve_entry = pve.pve_entry;
462 pve32->pve_timestamp = pve.pve_timestamp;
463 pve32->pve_start = pve.pve_start;
464 pve32->pve_end = pve.pve_end;
465 pve32->pve_offset = pve.pve_offset;
466 pve32->pve_prot = pve.pve_prot;
467 pve32->pve_fileid = pve.pve_fileid;
468 pve32->pve_fsid = pve.pve_fsid;
471 pve32->pve_pathlen = pve.pve_pathlen;
476 ptrace_lwpinfo_to32(const struct ptrace_lwpinfo *pl,
477 struct ptrace_lwpinfo32 *pl32)
480 pl32->pl_lwpid = pl->pl_lwpid;
481 pl32->pl_event = pl->pl_event;
482 pl32->pl_flags = pl->pl_flags;
483 pl32->pl_sigmask = pl->pl_sigmask;
484 pl32->pl_siglist = pl->pl_siglist;
485 siginfo_to_siginfo32(&pl->pl_siginfo, &pl32->pl_siginfo);
486 strcpy(pl32->pl_tdname, pl->pl_tdname);
487 pl32->pl_child_pid = pl->pl_child_pid;
488 pl32->pl_syscall_code = pl->pl_syscall_code;
489 pl32->pl_syscall_narg = pl->pl_syscall_narg;
491 #endif /* COMPAT_FREEBSD32 */
494 * Process debugging system call.
496 #ifndef _SYS_SYSPROTO_H_
505 #ifdef COMPAT_FREEBSD32
507 * This CPP subterfuge is to try and reduce the number of ifdefs in
508 * the body of the code.
509 * COPYIN(uap->addr, &r.reg, sizeof r.reg);
511 * copyin(uap->addr, &r.reg, sizeof r.reg);
513 * copyin(uap->addr, &r.reg32, sizeof r.reg32);
514 * .. except this is done at runtime.
516 #define COPYIN(u, k, s) wrap32 ? \
517 copyin(u, k ## 32, s ## 32) : \
519 #define COPYOUT(k, u, s) wrap32 ? \
520 copyout(k ## 32, u, s ## 32) : \
523 #define COPYIN(u, k, s) copyin(u, k, s)
524 #define COPYOUT(k, u, s) copyout(k, u, s)
527 sys_ptrace(struct thread *td, struct ptrace_args *uap)
530 * XXX this obfuscation is to reduce stack usage, but the register
531 * structs may be too large to put on the stack anyway.
534 struct ptrace_io_desc piod;
535 struct ptrace_lwpinfo pl;
536 struct ptrace_vm_entry pve;
540 #ifdef COMPAT_FREEBSD32
541 struct dbreg32 dbreg32;
542 struct fpreg32 fpreg32;
544 struct ptrace_io_desc32 piod32;
545 struct ptrace_lwpinfo32 pl32;
546 struct ptrace_vm_entry32 pve32;
551 #ifdef COMPAT_FREEBSD32
554 if (SV_CURPROC_FLAG(SV_ILP32))
557 AUDIT_ARG_PID(uap->pid);
558 AUDIT_ARG_CMD(uap->req);
559 AUDIT_ARG_VALUE(uap->data);
568 error = COPYIN(uap->addr, &r.reg, sizeof r.reg);
571 error = COPYIN(uap->addr, &r.fpreg, sizeof r.fpreg);
574 error = COPYIN(uap->addr, &r.dbreg, sizeof r.dbreg);
577 error = COPYIN(uap->addr, &r.piod, sizeof r.piod);
580 error = COPYIN(uap->addr, &r.pve, sizeof r.pve);
589 error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
595 error = COPYOUT(&r.pve, uap->addr, sizeof r.pve);
598 error = COPYOUT(&r.piod, uap->addr, sizeof r.piod);
601 error = COPYOUT(&r.reg, uap->addr, sizeof r.reg);
604 error = COPYOUT(&r.fpreg, uap->addr, sizeof r.fpreg);
607 error = COPYOUT(&r.dbreg, uap->addr, sizeof r.dbreg);
610 error = copyout(&r.pl, uap->addr, uap->data);
619 #ifdef COMPAT_FREEBSD32
621 * PROC_READ(regs, td2, addr);
623 * proc_read_regs(td2, addr);
625 * proc_read_regs32(td2, addr);
626 * .. except this is done at runtime. There is an additional
627 * complication in that PROC_WRITE disallows 32 bit consumers
628 * from writing to 64 bit address space targets.
630 #define PROC_READ(w, t, a) wrap32 ? \
631 proc_read_ ## w ## 32(t, a) : \
632 proc_read_ ## w (t, a)
633 #define PROC_WRITE(w, t, a) wrap32 ? \
634 (safe ? proc_write_ ## w ## 32(t, a) : EINVAL ) : \
635 proc_write_ ## w (t, a)
637 #define PROC_READ(w, t, a) proc_read_ ## w (t, a)
638 #define PROC_WRITE(w, t, a) proc_write_ ## w (t, a)
642 kern_ptrace(struct thread *td, int req, pid_t pid, void *addr, int data)
646 struct proc *curp, *p, *pp;
647 struct thread *td2 = NULL;
648 struct ptrace_io_desc *piod = NULL;
649 struct ptrace_lwpinfo *pl;
650 int error, write, tmp, num;
651 int proctree_locked = 0;
652 lwpid_t tid = 0, *buf;
653 #ifdef COMPAT_FREEBSD32
654 int wrap32 = 0, safe = 0;
655 struct ptrace_io_desc32 *piod32 = NULL;
656 struct ptrace_lwpinfo32 *pl32 = NULL;
657 struct ptrace_lwpinfo plr;
662 /* Lock proctree before locking the process. */
673 sx_xlock(&proctree_lock);
681 if (req == PT_TRACE_ME) {
685 if (pid <= PID_MAX) {
686 if ((p = pfind(pid)) == NULL) {
688 sx_xunlock(&proctree_lock);
692 td2 = tdfind(pid, -1);
695 sx_xunlock(&proctree_lock);
703 AUDIT_ARG_PROCESS(p);
705 if ((p->p_flag & P_WEXIT) != 0) {
709 if ((error = p_cansee(td, p)) != 0)
712 if ((error = p_candebug(td, p)) != 0)
716 * System processes can't be debugged.
718 if ((p->p_flag & P_SYSTEM) != 0) {
724 if ((p->p_flag & P_STOPPED_TRACE) != 0) {
725 KASSERT(p->p_xthread != NULL, ("NULL p_xthread"));
728 td2 = FIRST_THREAD_IN_PROC(p);
733 #ifdef COMPAT_FREEBSD32
735 * Test if we're a 32 bit client and what the target is.
736 * Set the wrap controls accordingly.
738 if (SV_CURPROC_FLAG(SV_ILP32)) {
739 if (SV_PROC_FLAG(td2->td_proc, SV_ILP32))
754 if (p->p_pid == td->td_proc->p_pid) {
760 if (p->p_flag & P_TRACED) {
765 /* Can't trace an ancestor if you're being traced. */
766 if (curp->p_flag & P_TRACED) {
767 for (pp = curp->p_pptr; pp != NULL; pp = pp->p_pptr) {
780 /* Allow thread to clear single step for itself */
781 if (td->td_tid == tid)
786 /* not being traced... */
787 if ((p->p_flag & P_TRACED) == 0) {
792 /* not being traced by YOU */
793 if (p->p_pptr != td->td_proc) {
798 /* not currently stopped */
799 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) == 0 ||
800 p->p_suspcount != p->p_numthreads ||
801 (p->p_flag & P_WAITED) == 0) {
806 if ((p->p_flag & P_STOPPED_TRACE) == 0) {
807 static int count = 0;
809 printf("P_STOPPED_TRACE not set.\n");
816 /* Keep this process around until we finish this request. */
821 * Single step fixup ala procfs
827 * Actually do the requests
830 td->td_retval[0] = 0;
834 /* set my trace flag and "owner" so it can read/write me */
835 p->p_flag |= P_TRACED;
836 if (p->p_flag & P_PPWAIT)
837 p->p_flag |= P_PPTRACE;
838 p->p_oppid = p->p_pptr->p_pid;
839 CTR1(KTR_PTRACE, "PT_TRACE_ME: pid %d", p->p_pid);
843 /* security check done above */
845 * It would be nice if the tracing relationship was separate
846 * from the parent relationship but that would require
847 * another set of links in the proc struct or for "wait"
848 * to scan the entire proc table. To make life easier,
849 * we just re-parent the process we're trying to trace.
850 * The old parent is remembered so we can put things back
853 p->p_flag |= P_TRACED;
854 p->p_oppid = p->p_pptr->p_pid;
855 if (p->p_pptr != td->td_proc) {
856 proc_reparent(p, td->td_proc);
859 CTR2(KTR_PTRACE, "PT_ATTACH: pid %d, oppid %d", p->p_pid,
861 goto sendsig; /* in PT_CONTINUE below */
864 CTR2(KTR_PTRACE, "PT_CLEARSTEP: tid %d (pid %d)", td2->td_tid,
866 error = ptrace_clear_single_step(td2);
870 CTR2(KTR_PTRACE, "PT_SETSTEP: tid %d (pid %d)", td2->td_tid,
872 error = ptrace_single_step(td2);
876 CTR2(KTR_PTRACE, "PT_SUSPEND: tid %d (pid %d)", td2->td_tid,
878 td2->td_dbgflags |= TDB_SUSPEND;
880 td2->td_flags |= TDF_NEEDSUSPCHK;
885 CTR2(KTR_PTRACE, "PT_RESUME: tid %d (pid %d)", td2->td_tid,
887 td2->td_dbgflags &= ~TDB_SUSPEND;
891 CTR3(KTR_PTRACE, "PT_FOLLOW_FORK: pid %d %s -> %s", p->p_pid,
892 p->p_flag & P_FOLLOWFORK ? "enabled" : "disabled",
893 data ? "enabled" : "disabled");
895 p->p_flag |= P_FOLLOWFORK;
897 p->p_flag &= ~P_FOLLOWFORK;
906 /* Zero means do not send any signal */
907 if (data < 0 || data > _SIG_MAXSIG) {
914 CTR2(KTR_PTRACE, "PT_STEP: tid %d (pid %d)",
915 td2->td_tid, p->p_pid);
916 error = ptrace_single_step(td2);
924 if (addr != (void *)1) {
925 error = ptrace_set_pc(td2,
926 (u_long)(uintfptr_t)addr);
932 p->p_stops |= S_PT_SCE;
934 "PT_TO_SCE: pid %d, stops = %#x, PC = %#lx, sig = %d",
935 p->p_pid, p->p_stops,
936 (u_long)(uintfptr_t)addr, data);
939 p->p_stops |= S_PT_SCX;
941 "PT_TO_SCX: pid %d, stops = %#x, PC = %#lx, sig = %d",
942 p->p_pid, p->p_stops,
943 (u_long)(uintfptr_t)addr, data);
946 p->p_stops |= S_PT_SCE | S_PT_SCX;
948 "PT_SYSCALL: pid %d, stops = %#x, PC = %#lx, sig = %d",
949 p->p_pid, p->p_stops,
950 (u_long)(uintfptr_t)addr, data);
954 "PT_CONTINUE: pid %d, PC = %#lx, sig = %d",
955 p->p_pid, (u_long)(uintfptr_t)addr, data);
961 * Reset the process parent.
963 * NB: This clears P_TRACED before reparenting
964 * a detached process back to its original
965 * parent. Otherwise the debugee will be set
966 * as an orphan of the debugger.
968 p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
969 if (p->p_oppid != p->p_pptr->p_pid) {
970 PROC_LOCK(p->p_pptr);
971 sigqueue_take(p->p_ksi);
972 PROC_UNLOCK(p->p_pptr);
974 pp = proc_realparent(p);
975 proc_reparent(p, pp);
977 p->p_sigparent = SIGCHLD;
979 "PT_DETACH: pid %d reparented to pid %d, sig %d",
980 p->p_pid, pp->p_pid, data);
982 CTR2(KTR_PTRACE, "PT_DETACH: pid %d, sig %d",
986 /* should we send SIGCHLD? */
987 /* childproc_continued(p); */
992 if (proctree_locked) {
993 sx_xunlock(&proctree_lock);
998 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
999 /* deliver or queue signal */
1000 td2->td_dbgflags &= ~TDB_XSIG;
1001 td2->td_xsig = data;
1003 if (req == PT_DETACH) {
1005 FOREACH_THREAD_IN_PROC(p, td3) {
1006 td3->td_dbgflags &= ~TDB_SUSPEND;
1010 * unsuspend all threads, to not let a thread run,
1011 * you should use PT_SUSPEND to suspend it before
1012 * continuing process.
1015 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
1016 thread_unsuspend(p);
1020 kern_psignal(p, data);
1026 td2->td_dbgflags |= TDB_USERWR;
1033 /* write = 0 set above */
1034 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
1035 iov.iov_len = sizeof(int);
1038 uio.uio_offset = (off_t)(uintptr_t)addr;
1039 uio.uio_resid = sizeof(int);
1040 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */
1041 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
1043 error = proc_rwmem(p, &uio);
1044 if (uio.uio_resid != 0) {
1046 * XXX proc_rwmem() doesn't currently return ENOSPC,
1047 * so I think write() can bogusly return 0.
1048 * XXX what happens for short writes? We don't want
1049 * to write partial data.
1050 * XXX proc_rwmem() returns EPERM for other invalid
1051 * addresses. Convert this to EINVAL. Does this
1052 * clobber returns of EPERM for other reasons?
1054 if (error == 0 || error == ENOSPC || error == EPERM)
1055 error = EINVAL; /* EOF */
1058 td->td_retval[0] = tmp;
1061 CTR3(KTR_PTRACE, "PT_WRITE: pid %d: %p <= %#x",
1062 p->p_pid, addr, data);
1064 CTR3(KTR_PTRACE, "PT_READ: pid %d: %p >= %#x",
1065 p->p_pid, addr, tmp);
1071 #ifdef COMPAT_FREEBSD32
1074 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1075 iov.iov_len = piod32->piod_len;
1076 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1077 uio.uio_resid = piod32->piod_len;
1082 iov.iov_base = piod->piod_addr;
1083 iov.iov_len = piod->piod_len;
1084 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1085 uio.uio_resid = piod->piod_len;
1089 uio.uio_segflg = UIO_USERSPACE;
1091 #ifdef COMPAT_FREEBSD32
1092 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1094 tmp = piod->piod_op;
1099 CTR3(KTR_PTRACE, "PT_IO: pid %d: READ (%p, %#x)",
1100 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1101 uio.uio_rw = UIO_READ;
1105 CTR3(KTR_PTRACE, "PT_IO: pid %d: WRITE (%p, %#x)",
1106 p->p_pid, (uintptr_t)uio.uio_offset, uio.uio_resid);
1107 td2->td_dbgflags |= TDB_USERWR;
1108 uio.uio_rw = UIO_WRITE;
1115 error = proc_rwmem(p, &uio);
1116 #ifdef COMPAT_FREEBSD32
1118 piod32->piod_len -= uio.uio_resid;
1121 piod->piod_len -= uio.uio_resid;
1126 CTR1(KTR_PTRACE, "PT_KILL: pid %d", p->p_pid);
1128 goto sendsig; /* in PT_CONTINUE above */
1131 CTR2(KTR_PTRACE, "PT_SETREGS: tid %d (pid %d)", td2->td_tid,
1133 td2->td_dbgflags |= TDB_USERWR;
1134 error = PROC_WRITE(regs, td2, addr);
1138 CTR2(KTR_PTRACE, "PT_GETREGS: tid %d (pid %d)", td2->td_tid,
1140 error = PROC_READ(regs, td2, addr);
1144 CTR2(KTR_PTRACE, "PT_SETFPREGS: tid %d (pid %d)", td2->td_tid,
1146 td2->td_dbgflags |= TDB_USERWR;
1147 error = PROC_WRITE(fpregs, td2, addr);
1151 CTR2(KTR_PTRACE, "PT_GETFPREGS: tid %d (pid %d)", td2->td_tid,
1153 error = PROC_READ(fpregs, td2, addr);
1157 CTR2(KTR_PTRACE, "PT_SETDBREGS: tid %d (pid %d)", td2->td_tid,
1159 td2->td_dbgflags |= TDB_USERWR;
1160 error = PROC_WRITE(dbregs, td2, addr);
1164 CTR2(KTR_PTRACE, "PT_GETDBREGS: tid %d (pid %d)", td2->td_tid,
1166 error = PROC_READ(dbregs, td2, addr);
1171 #ifdef COMPAT_FREEBSD32
1172 (!wrap32 && data > sizeof(*pl)) ||
1173 (wrap32 && data > sizeof(*pl32))) {
1175 data > sizeof(*pl)) {
1180 #ifdef COMPAT_FREEBSD32
1187 pl->pl_lwpid = td2->td_tid;
1188 pl->pl_event = PL_EVENT_NONE;
1190 if (td2->td_dbgflags & TDB_XSIG) {
1191 pl->pl_event = PL_EVENT_SIGNAL;
1192 if (td2->td_dbgksi.ksi_signo != 0 &&
1193 #ifdef COMPAT_FREEBSD32
1194 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1195 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1196 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1197 pl_siginfo) + sizeof(struct siginfo32)))
1199 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1200 + sizeof(pl->pl_siginfo)
1203 pl->pl_flags |= PL_FLAG_SI;
1204 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
1207 if ((pl->pl_flags & PL_FLAG_SI) == 0)
1208 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
1209 if (td2->td_dbgflags & TDB_SCE)
1210 pl->pl_flags |= PL_FLAG_SCE;
1211 else if (td2->td_dbgflags & TDB_SCX)
1212 pl->pl_flags |= PL_FLAG_SCX;
1213 if (td2->td_dbgflags & TDB_EXEC)
1214 pl->pl_flags |= PL_FLAG_EXEC;
1215 if (td2->td_dbgflags & TDB_FORK) {
1216 pl->pl_flags |= PL_FLAG_FORKED;
1217 pl->pl_child_pid = td2->td_dbg_forked;
1219 if (td2->td_dbgflags & TDB_CHILD)
1220 pl->pl_flags |= PL_FLAG_CHILD;
1221 pl->pl_sigmask = td2->td_sigmask;
1222 pl->pl_siglist = td2->td_siglist;
1223 strcpy(pl->pl_tdname, td2->td_name);
1224 if ((td2->td_dbgflags & (TDB_SCE | TDB_SCX)) != 0) {
1225 pl->pl_syscall_code = td2->td_dbg_sc_code;
1226 pl->pl_syscall_narg = td2->td_dbg_sc_narg;
1228 pl->pl_syscall_code = 0;
1229 pl->pl_syscall_narg = 0;
1231 #ifdef COMPAT_FREEBSD32
1233 ptrace_lwpinfo_to32(pl, pl32);
1236 "PT_LWPINFO: tid %d (pid %d) event %d flags %#x child pid %d syscall %d",
1237 td2->td_tid, p->p_pid, pl->pl_event, pl->pl_flags,
1238 pl->pl_child_pid, pl->pl_syscall_code);
1242 CTR2(KTR_PTRACE, "PT_GETNUMLWPS: pid %d: %d threads", p->p_pid,
1244 td->td_retval[0] = p->p_numthreads;
1248 CTR3(KTR_PTRACE, "PT_GETLWPLIST: pid %d: data %d, actual %d",
1249 p->p_pid, data, p->p_numthreads);
1254 num = imin(p->p_numthreads, data);
1256 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1259 FOREACH_THREAD_IN_PROC(p, td2) {
1262 buf[tmp++] = td2->td_tid;
1265 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1268 td->td_retval[0] = tmp;
1272 case PT_VM_TIMESTAMP:
1273 CTR2(KTR_PTRACE, "PT_VM_TIMESTAMP: pid %d: timestamp %d",
1274 p->p_pid, p->p_vmspace->vm_map.timestamp);
1275 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1280 #ifdef COMPAT_FREEBSD32
1282 error = ptrace_vm_entry32(td, p, addr);
1285 error = ptrace_vm_entry(td, p, addr);
1290 #ifdef __HAVE_PTRACE_MACHDEP
1291 if (req >= PT_FIRSTMACH) {
1293 error = cpu_ptrace(td2, req, addr, data);
1297 /* Unknown request. */
1303 /* Drop our hold on this process now that the request has completed. */
1307 if (proctree_locked)
1308 sx_xunlock(&proctree_lock);
1315 * Stop a process because of a debugging event;
1316 * stay stopped until p->p_step is cleared
1317 * (cleared by PIOCCONT in procfs).
1320 stopevent(struct proc *p, unsigned int event, unsigned int val)
1323 PROC_LOCK_ASSERT(p, MA_OWNED);
1325 CTR3(KTR_PTRACE, "stopevent: pid %d event %u val %u", p->p_pid, event,
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);
1337 protect_setchild(struct thread *td, struct proc *p, int flags)
1340 PROC_LOCK_ASSERT(p, MA_OWNED);
1341 if (p->p_flag & P_SYSTEM || p_cansched(td, p) != 0)
1343 if (flags & PPROT_SET) {
1344 p->p_flag |= P_PROTECTED;
1345 if (flags & PPROT_INHERIT)
1346 p->p_flag2 |= P2_INHERIT_PROTECTED;
1348 p->p_flag &= ~P_PROTECTED;
1349 p->p_flag2 &= ~P2_INHERIT_PROTECTED;
1355 protect_setchildren(struct thread *td, struct proc *top, int flags)
1362 sx_assert(&proctree_lock, SX_LOCKED);
1364 ret |= protect_setchild(td, p, flags);
1367 * If this process has children, descend to them next,
1368 * otherwise do any siblings, and if done with this level,
1369 * follow back up the tree (but not past top).
1371 if (!LIST_EMPTY(&p->p_children))
1372 p = LIST_FIRST(&p->p_children);
1378 if (LIST_NEXT(p, p_sibling)) {
1379 p = LIST_NEXT(p, p_sibling);
1389 protect_set(struct thread *td, struct proc *p, int flags)
1393 switch (PPROT_OP(flags)) {
1401 if ((PPROT_FLAGS(flags) & ~(PPROT_DESCEND | PPROT_INHERIT)) != 0)
1404 error = priv_check(td, PRIV_VM_MADV_PROTECT);
1408 if (flags & PPROT_DESCEND)
1409 ret = protect_setchildren(td, p, flags);
1411 ret = protect_setchild(td, p, flags);
1417 #ifndef _SYS_SYSPROTO_H_
1418 struct procctl_args {
1427 sys_procctl(struct thread *td, struct procctl_args *uap)
1434 error = copyin(uap->data, &flags, sizeof(flags));
1443 return (kern_procctl(td, uap->idtype, uap->id, uap->com, data));
1447 kern_procctl_single(struct thread *td, struct proc *p, int com, void *data)
1450 PROC_LOCK_ASSERT(p, MA_OWNED);
1453 return (protect_set(td, p, *(int *)data));
1460 kern_procctl(struct thread *td, idtype_t idtype, id_t id, int com, void *data)
1464 int error, first_error, ok;
1466 sx_slock(&proctree_lock);
1474 if (p->p_state == PRS_NEW)
1477 error = p_cansee(td, p);
1479 error = kern_procctl_single(td, p, com, data);
1484 * Attempt to apply the operation to all members of the
1485 * group. Ignore processes in the group that can't be
1486 * seen. Ignore errors so long as at least one process is
1487 * able to complete the request successfully.
1497 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
1499 if (p->p_state == PRS_NEW || p_cansee(td, p) != 0) {
1503 error = kern_procctl_single(td, p, com, data);
1507 else if (first_error == 0)
1508 first_error = error;
1512 else if (first_error != 0)
1513 error = first_error;
1516 * Was not able to see any processes in the
1525 sx_sunlock(&proctree_lock);