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 int pl_child_pid; /* New child pid */
105 * Functions implemented using PROC_ACTION():
107 * proc_read_regs(proc, regs)
108 * Get the current user-visible register set from the process
109 * and copy it into the regs structure (<machine/reg.h>).
110 * The process is stopped at the time read_regs is called.
112 * proc_write_regs(proc, regs)
113 * Update the current register set from the passed in regs
114 * structure. Take care to avoid clobbering special CPU
115 * registers or privileged bits in the PSL.
116 * Depending on the architecture this may have fix-up work to do,
117 * especially if the IAR or PCW are modified.
118 * The process is stopped at the time write_regs is called.
120 * proc_read_fpregs, proc_write_fpregs
121 * deal with the floating point register set, otherwise as above.
123 * proc_read_dbregs, proc_write_dbregs
124 * deal with the processor debug register set, otherwise as above.
127 * Arrange for the process to trap after executing a single instruction.
130 #define PROC_ACTION(action) do { \
133 PROC_LOCK_ASSERT(td->td_proc, MA_OWNED); \
134 if ((td->td_proc->p_flag & P_INMEM) == 0) \
142 proc_read_regs(struct thread *td, struct reg *regs)
145 PROC_ACTION(fill_regs(td, regs));
149 proc_write_regs(struct thread *td, struct reg *regs)
152 PROC_ACTION(set_regs(td, regs));
156 proc_read_dbregs(struct thread *td, struct dbreg *dbregs)
159 PROC_ACTION(fill_dbregs(td, dbregs));
163 proc_write_dbregs(struct thread *td, struct dbreg *dbregs)
166 PROC_ACTION(set_dbregs(td, dbregs));
170 * Ptrace doesn't support fpregs at all, and there are no security holes
171 * or translations for fpregs, so we can just copy them.
174 proc_read_fpregs(struct thread *td, struct fpreg *fpregs)
177 PROC_ACTION(fill_fpregs(td, fpregs));
181 proc_write_fpregs(struct thread *td, struct fpreg *fpregs)
184 PROC_ACTION(set_fpregs(td, fpregs));
187 #ifdef COMPAT_FREEBSD32
188 /* For 32 bit binaries, we need to expose the 32 bit regs layouts. */
190 proc_read_regs32(struct thread *td, struct reg32 *regs32)
193 PROC_ACTION(fill_regs32(td, regs32));
197 proc_write_regs32(struct thread *td, struct reg32 *regs32)
200 PROC_ACTION(set_regs32(td, regs32));
204 proc_read_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
207 PROC_ACTION(fill_dbregs32(td, dbregs32));
211 proc_write_dbregs32(struct thread *td, struct dbreg32 *dbregs32)
214 PROC_ACTION(set_dbregs32(td, dbregs32));
218 proc_read_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
221 PROC_ACTION(fill_fpregs32(td, fpregs32));
225 proc_write_fpregs32(struct thread *td, struct fpreg32 *fpregs32)
228 PROC_ACTION(set_fpregs32(td, fpregs32));
233 proc_sstep(struct thread *td)
236 PROC_ACTION(ptrace_single_step(td));
240 proc_rwmem(struct proc *p, struct uio *uio)
243 vm_offset_t pageno; /* page number */
245 int error, fault_flags, page_offset, writing;
248 * Assert that someone has locked this vmspace. (Should be
249 * curthread but we can't assert that.) This keeps the process
250 * from exiting out from under us until this operation completes.
252 KASSERT(p->p_lock >= 1, ("%s: process %p (pid %d) not held", __func__,
258 map = &p->p_vmspace->vm_map;
261 * If we are writing, then we request vm_fault() to create a private
262 * copy of each page. Since these copies will not be writeable by the
263 * process, we must explicity request that they be dirtied.
265 writing = uio->uio_rw == UIO_WRITE;
266 reqprot = writing ? VM_PROT_COPY | VM_PROT_READ : VM_PROT_READ;
267 fault_flags = writing ? VM_FAULT_DIRTY : VM_FAULT_NORMAL;
270 * Only map in one page at a time. We don't have to, but it
271 * makes things easier. This way is trivial - right?
278 uva = (vm_offset_t)uio->uio_offset;
281 * Get the page number of this segment.
283 pageno = trunc_page(uva);
284 page_offset = uva - pageno;
287 * How many bytes to copy
289 len = min(PAGE_SIZE - page_offset, uio->uio_resid);
292 * Fault and hold the page on behalf of the process.
294 error = vm_fault_hold(map, pageno, reqprot, fault_flags, &m);
295 if (error != KERN_SUCCESS) {
296 if (error == KERN_RESOURCE_SHORTAGE)
304 * Now do the i/o move.
306 error = uiomove_fromphys(&m, page_offset, len, uio);
308 /* Make the I-cache coherent for breakpoints. */
309 if (writing && error == 0) {
310 vm_map_lock_read(map);
311 if (vm_map_check_protection(map, pageno, pageno +
312 PAGE_SIZE, VM_PROT_EXECUTE))
313 vm_sync_icache(map, uva, len);
314 vm_map_unlock_read(map);
324 } while (error == 0 && uio->uio_resid > 0);
330 ptrace_vm_entry(struct thread *td, struct proc *p, struct ptrace_vm_entry *pve)
334 vm_map_entry_t entry;
335 vm_object_t obj, tobj, lobj;
338 char *freepath, *fullpath;
340 int error, index, vfslocked;
345 vm = vmspace_acquire_ref(p);
347 vm_map_lock_read(map);
350 entry = map->header.next;
352 while (index < pve->pve_entry && entry != &map->header) {
356 if (index != pve->pve_entry) {
360 while (entry != &map->header &&
361 (entry->eflags & MAP_ENTRY_IS_SUB_MAP) != 0) {
365 if (entry == &map->header) {
370 /* We got an entry. */
371 pve->pve_entry = index + 1;
372 pve->pve_timestamp = map->timestamp;
373 pve->pve_start = entry->start;
374 pve->pve_end = entry->end - 1;
375 pve->pve_offset = entry->offset;
376 pve->pve_prot = entry->protection;
378 /* Backing object's path needed? */
379 if (pve->pve_pathlen == 0)
382 pathlen = pve->pve_pathlen;
383 pve->pve_pathlen = 0;
385 obj = entry->object.vm_object;
390 vm_map_unlock_read(map);
393 pve->pve_fsid = VNOVAL;
394 pve->pve_fileid = VNOVAL;
396 if (error == 0 && obj != NULL) {
398 for (tobj = obj; tobj != NULL; tobj = tobj->backing_object) {
400 VM_OBJECT_LOCK(tobj);
402 VM_OBJECT_UNLOCK(lobj);
404 pve->pve_offset += tobj->backing_object_offset;
406 vp = (lobj->type == OBJT_VNODE) ? lobj->handle : NULL;
410 VM_OBJECT_UNLOCK(lobj);
411 VM_OBJECT_UNLOCK(obj);
416 vn_fullpath(td, vp, &fullpath, &freepath);
417 vfslocked = VFS_LOCK_GIANT(vp->v_mount);
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;
424 VFS_UNLOCK_GIANT(vfslocked);
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);
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;
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;
835 /* security check done above */
837 * It would be nice if the tracing relationship was separate
838 * from the parent relationship but that would require
839 * another set of links in the proc struct or for "wait"
840 * to scan the entire proc table. To make life easier,
841 * we just re-parent the process we're trying to trace.
842 * The old parent is remembered so we can put things back
845 p->p_flag |= P_TRACED;
846 p->p_oppid = p->p_pptr->p_pid;
847 if (p->p_pptr != td->td_proc) {
848 proc_reparent(p, td->td_proc);
851 goto sendsig; /* in PT_CONTINUE below */
854 error = ptrace_clear_single_step(td2);
858 error = ptrace_single_step(td2);
862 td2->td_dbgflags |= TDB_SUSPEND;
864 td2->td_flags |= TDF_NEEDSUSPCHK;
869 td2->td_dbgflags &= ~TDB_SUSPEND;
874 p->p_flag |= P_FOLLOWFORK;
876 p->p_flag &= ~P_FOLLOWFORK;
885 /* Zero means do not send any signal */
886 if (data < 0 || data > _SIG_MAXSIG) {
893 error = ptrace_single_step(td2);
901 if (addr != (void *)1) {
902 error = ptrace_set_pc(td2,
903 (u_long)(uintfptr_t)addr);
909 p->p_stops |= S_PT_SCE;
912 p->p_stops |= S_PT_SCX;
915 p->p_stops |= S_PT_SCE | S_PT_SCX;
920 /* reset process parent */
921 if (p->p_oppid != p->p_pptr->p_pid) {
924 PROC_LOCK(p->p_pptr);
925 sigqueue_take(p->p_ksi);
926 PROC_UNLOCK(p->p_pptr);
929 pp = pfind(p->p_oppid);
935 proc_reparent(p, pp);
937 p->p_sigparent = SIGCHLD;
940 p->p_flag &= ~(P_TRACED | P_WAITED | P_FOLLOWFORK);
942 /* should we send SIGCHLD? */
943 /* childproc_continued(p); */
948 if (proctree_locked) {
949 sx_xunlock(&proctree_lock);
954 if ((p->p_flag & (P_STOPPED_SIG | P_STOPPED_TRACE)) != 0) {
955 /* deliver or queue signal */
956 td2->td_dbgflags &= ~TDB_XSIG;
959 if (req == PT_DETACH) {
961 FOREACH_THREAD_IN_PROC(p, td3) {
962 td3->td_dbgflags &= ~TDB_SUSPEND;
966 * unsuspend all threads, to not let a thread run,
967 * you should use PT_SUSPEND to suspend it before
968 * continuing process.
971 p->p_flag &= ~(P_STOPPED_TRACE|P_STOPPED_SIG|P_WAITED);
976 kern_psignal(p, data);
982 td2->td_dbgflags |= TDB_USERWR;
989 /* write = 0 set above */
990 iov.iov_base = write ? (caddr_t)&data : (caddr_t)&tmp;
991 iov.iov_len = sizeof(int);
994 uio.uio_offset = (off_t)(uintptr_t)addr;
995 uio.uio_resid = sizeof(int);
996 uio.uio_segflg = UIO_SYSSPACE; /* i.e.: the uap */
997 uio.uio_rw = write ? UIO_WRITE : UIO_READ;
999 error = proc_rwmem(p, &uio);
1000 if (uio.uio_resid != 0) {
1002 * XXX proc_rwmem() doesn't currently return ENOSPC,
1003 * so I think write() can bogusly return 0.
1004 * XXX what happens for short writes? We don't want
1005 * to write partial data.
1006 * XXX proc_rwmem() returns EPERM for other invalid
1007 * addresses. Convert this to EINVAL. Does this
1008 * clobber returns of EPERM for other reasons?
1010 if (error == 0 || error == ENOSPC || error == EPERM)
1011 error = EINVAL; /* EOF */
1014 td->td_retval[0] = tmp;
1019 #ifdef COMPAT_FREEBSD32
1022 iov.iov_base = (void *)(uintptr_t)piod32->piod_addr;
1023 iov.iov_len = piod32->piod_len;
1024 uio.uio_offset = (off_t)(uintptr_t)piod32->piod_offs;
1025 uio.uio_resid = piod32->piod_len;
1030 iov.iov_base = piod->piod_addr;
1031 iov.iov_len = piod->piod_len;
1032 uio.uio_offset = (off_t)(uintptr_t)piod->piod_offs;
1033 uio.uio_resid = piod->piod_len;
1037 uio.uio_segflg = UIO_USERSPACE;
1039 #ifdef COMPAT_FREEBSD32
1040 tmp = wrap32 ? piod32->piod_op : piod->piod_op;
1042 tmp = piod->piod_op;
1047 uio.uio_rw = UIO_READ;
1051 td2->td_dbgflags |= TDB_USERWR;
1052 uio.uio_rw = UIO_WRITE;
1059 error = proc_rwmem(p, &uio);
1060 #ifdef COMPAT_FREEBSD32
1062 piod32->piod_len -= uio.uio_resid;
1065 piod->piod_len -= uio.uio_resid;
1071 goto sendsig; /* in PT_CONTINUE above */
1074 td2->td_dbgflags |= TDB_USERWR;
1075 error = PROC_WRITE(regs, td2, addr);
1079 error = PROC_READ(regs, td2, addr);
1083 td2->td_dbgflags |= TDB_USERWR;
1084 error = PROC_WRITE(fpregs, td2, addr);
1088 error = PROC_READ(fpregs, td2, addr);
1092 td2->td_dbgflags |= TDB_USERWR;
1093 error = PROC_WRITE(dbregs, td2, addr);
1097 error = PROC_READ(dbregs, td2, addr);
1102 #ifdef COMPAT_FREEBSD32
1103 (!wrap32 && data > sizeof(*pl)) ||
1104 (wrap32 && data > sizeof(*pl32))) {
1106 data > sizeof(*pl)) {
1111 #ifdef COMPAT_FREEBSD32
1118 pl->pl_lwpid = td2->td_tid;
1119 pl->pl_event = PL_EVENT_NONE;
1121 if (td2->td_dbgflags & TDB_XSIG) {
1122 pl->pl_event = PL_EVENT_SIGNAL;
1123 if (td2->td_dbgksi.ksi_signo != 0 &&
1124 #ifdef COMPAT_FREEBSD32
1125 ((!wrap32 && data >= offsetof(struct ptrace_lwpinfo,
1126 pl_siginfo) + sizeof(pl->pl_siginfo)) ||
1127 (wrap32 && data >= offsetof(struct ptrace_lwpinfo32,
1128 pl_siginfo) + sizeof(struct siginfo32)))
1130 data >= offsetof(struct ptrace_lwpinfo, pl_siginfo)
1131 + sizeof(pl->pl_siginfo)
1134 pl->pl_flags |= PL_FLAG_SI;
1135 pl->pl_siginfo = td2->td_dbgksi.ksi_info;
1138 if ((pl->pl_flags & PL_FLAG_SI) == 0)
1139 bzero(&pl->pl_siginfo, sizeof(pl->pl_siginfo));
1140 if (td2->td_dbgflags & TDB_SCE)
1141 pl->pl_flags |= PL_FLAG_SCE;
1142 else if (td2->td_dbgflags & TDB_SCX)
1143 pl->pl_flags |= PL_FLAG_SCX;
1144 if (td2->td_dbgflags & TDB_EXEC)
1145 pl->pl_flags |= PL_FLAG_EXEC;
1146 if (td2->td_dbgflags & TDB_FORK) {
1147 pl->pl_flags |= PL_FLAG_FORKED;
1148 pl->pl_child_pid = td2->td_dbg_forked;
1150 if (td2->td_dbgflags & TDB_CHILD)
1151 pl->pl_flags |= PL_FLAG_CHILD;
1152 pl->pl_sigmask = td2->td_sigmask;
1153 pl->pl_siglist = td2->td_siglist;
1154 strcpy(pl->pl_tdname, td2->td_name);
1155 #ifdef COMPAT_FREEBSD32
1157 ptrace_lwpinfo_to32(pl, pl32);
1162 td->td_retval[0] = p->p_numthreads;
1170 num = imin(p->p_numthreads, data);
1172 buf = malloc(num * sizeof(lwpid_t), M_TEMP, M_WAITOK);
1175 FOREACH_THREAD_IN_PROC(p, td2) {
1178 buf[tmp++] = td2->td_tid;
1181 error = copyout(buf, addr, tmp * sizeof(lwpid_t));
1184 td->td_retval[0] = tmp;
1188 case PT_VM_TIMESTAMP:
1189 td->td_retval[0] = p->p_vmspace->vm_map.timestamp;
1194 #ifdef COMPAT_FREEBSD32
1196 error = ptrace_vm_entry32(td, p, addr);
1199 error = ptrace_vm_entry(td, p, addr);
1204 #ifdef __HAVE_PTRACE_MACHDEP
1205 if (req >= PT_FIRSTMACH) {
1207 error = cpu_ptrace(td2, req, addr, data);
1211 /* Unknown request. */
1217 /* Drop our hold on this process now that the request has completed. */
1221 if (proctree_locked)
1222 sx_xunlock(&proctree_lock);
1229 * Stop a process because of a debugging event;
1230 * stay stopped until p->p_step is cleared
1231 * (cleared by PIOCCONT in procfs).
1234 stopevent(struct proc *p, unsigned int event, unsigned int val)
1237 PROC_LOCK_ASSERT(p, MA_OWNED);
1241 p->p_xthread = NULL;
1242 p->p_stype = event; /* Which event caused the stop? */
1243 wakeup(&p->p_stype); /* Wake up any PIOCWAIT'ing procs */
1244 msleep(&p->p_step, &p->p_mtx, PWAIT, "stopevent", 0);
1245 } while (p->p_step);
1249 protect_setchild(struct thread *td, struct proc *p, int flags)
1252 PROC_LOCK_ASSERT(p, MA_OWNED);
1253 if (p->p_flag & P_SYSTEM || p_cansee(td, p) != 0)
1255 if (flags & PPROT_SET) {
1256 p->p_flag |= P_PROTECTED;
1257 if (flags & PPROT_INHERIT)
1258 p->p_flag2 |= P2_INHERIT_PROTECTED;
1260 p->p_flag &= ~P_PROTECTED;
1261 p->p_flag2 &= ~P2_INHERIT_PROTECTED;
1267 protect_setchildren(struct thread *td, struct proc *top, int flags)
1274 sx_assert(&proctree_lock, SX_LOCKED);
1276 ret |= protect_setchild(td, p, flags);
1279 * If this process has children, descend to them next,
1280 * otherwise do any siblings, and if done with this level,
1281 * follow back up the tree (but not past top).
1283 if (!LIST_EMPTY(&p->p_children))
1284 p = LIST_FIRST(&p->p_children);
1290 if (LIST_NEXT(p, p_sibling)) {
1291 p = LIST_NEXT(p, p_sibling);
1301 protect_set(struct thread *td, struct proc *p, int flags)
1305 switch (PPROT_OP(flags)) {
1313 if ((PPROT_FLAGS(flags) & ~(PPROT_DESCEND | PPROT_INHERIT)) != 0)
1316 error = priv_check(td, PRIV_VM_MADV_PROTECT);
1320 if (flags & PPROT_DESCEND)
1321 ret = protect_setchildren(td, p, flags);
1323 ret = protect_setchild(td, p, flags);
1329 #ifndef _SYS_SYSPROTO_H_
1330 struct procctl_args {
1339 sys_procctl(struct thread *td, struct procctl_args *uap)
1346 error = copyin(uap->data, &flags, sizeof(flags));
1355 return (kern_procctl(td, uap->idtype, uap->id, uap->com, data));
1359 kern_procctl_single(struct thread *td, struct proc *p, int com, void *data)
1362 PROC_LOCK_ASSERT(p, MA_OWNED);
1365 return (protect_set(td, p, *(int *)data));
1372 kern_procctl(struct thread *td, idtype_t idtype, id_t id, int com, void *data)
1376 int error, first_error, ok;
1378 sx_slock(&proctree_lock);
1386 if (p->p_state == PRS_NEW)
1389 error = p_cansee(td, p);
1391 error = kern_procctl_single(td, p, com, data);
1396 * Attempt to apply the operation to all members of the
1397 * group. Ignore processes in the group that can't be
1398 * seen. Ignore errors so long as at least one process is
1399 * able to complete the request successfully.
1409 LIST_FOREACH(p, &pg->pg_members, p_pglist) {
1411 if (p->p_state == PRS_NEW || p_cansee(td, p) != 0) {
1415 error = kern_procctl_single(td, p, com, data);
1419 else if (first_error == 0)
1420 first_error = error;
1424 else if (first_error != 0)
1425 error = first_error;
1428 * Was not able to see any processes in the
1437 sx_sunlock(&proctree_lock);