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	diff --git a/lib/libsys/Symbol.sys.map b/lib/libsys/Symbol.sys.map
	--- a/lib/libsys/Symbol.sys.map
	+++ b/lib/libsys/Symbol.sys.map
	@@ -393,6 +393,7 @@
	FBSD_1.9 {
	pddupfd;
	pdopenpid;
	+ pdptrace;
	pdrfork;
	pdrfork_thread;
	renameat2;
	diff --git a/lib/libsys/_libsys.h b/lib/libsys/_libsys.h
	--- a/lib/libsys/_libsys.h
	+++ b/lib/libsys/_libsys.h
	@@ -477,6 +477,7 @@
	typedef int (__sys_renameat2_t)(int, const char , int, const char , int);
	typedef int (__sys_pdopenpid_t)(pid_t, int);
	typedef int (__sys_pddupfd_t)(int, int, int);
	+typedef int (__sys_pdptrace_t)(int, int, int, void *, int);

	_Noreturn void __sys__exit(int rval);
	int __sys_fork(void);
	@@ -889,6 +890,7 @@
	int __sys_renameat2(int oldfd, const char * old, int newfd, const char * new, int flags);
	int __sys_pdopenpid(pid_t pid, int flags);
	int __sys_pddupfd(int pd, int fd, int flags);
	+int __sys_pdptrace(int req, int pfd, int lwpid, void * addr, int data);
	__END_DECLS

	#endif /* __LIBSYS_H_ */
	diff --git a/lib/libsys/pdfork.2 b/lib/libsys/pdfork.2
	--- a/lib/libsys/pdfork.2
	+++ b/lib/libsys/pdfork.2
	@@ -66,6 +66,14 @@
	.Fc
	.Ft int
	.Fn pddupfd "int fd" "int remotefd" "int flags"
	+.Ft int
	+.Fo pdptrace
	+.Fa "int req"
	+.Fa "int fd"
	+.Fa "int lwpid"
	+.Fa "void *addr"
	+.Fa "int data"
	+.Fc
	.Sh DESCRIPTION
	Process descriptors are special file descriptors that represent processes,
	and are created using
	@@ -83,7 +91,7 @@
	.Fn pdfork
	can accept the
	.Fa pdflags:
	-.Bl -tag -width PD_CLOEXEC
	+.Bl -tag -width PD_PTRACE_CAP
	.It Dv PD_DAEMON
	Instead of the default terminate-on-close behaviour, allow the process to
	live until it is explicitly killed with
	@@ -106,6 +114,15 @@
	.It Dv PD_NOWAITPID
	The parent cannot obtain the child's status with
	.Xr waitpid 2 .
	+.It Dv PD_PTRACE_CAP
	+Allows the
	+.Xr pdptrace 2
	+requests on the resulting file descriptor.
	+See
	+.Xr rights 4
	+for the description of the
	+.Dv CAP_PTRACE
	+capability.
	.El
	.Pp
	The
	@@ -197,6 +214,20 @@
	argument is reserved and must be zero.
	Certain file descriptor types cannot be copied this way, namely
	kqueues.
	+.Pp
	+The
	+.Fn pdptrace
	+function
	+allows to execute the
	+.Xr ptrace 2
	+request on the process specified by the process descriptor
	+.Fa fd .
	+In addition to the arguments taken by the
	+.Xr ptrace 2 ,
	+the
	+.Fa lwpid
	+thread identifier can designate the thread on which the request
	+must operate.
	.Sh INTERACTION OF PROCESS DESCRIPTORS AND Xr WAITPID 2
	.Pp
	The
	@@ -461,8 +492,9 @@
	with input from
	.An Alan Somers Aq Mt asomers@FreeBSD.org .
	The
	-.Fn pdopenpid
	+.Fn pdopenpid ,
	+.Fn pddupfd ,
	and
	-.Fn pddupfd
	+.Fn pdptrace
	functions were developed by
	.An Konstantin Belousov Aq Mt kib@FreeBSD.org .
	diff --git a/lib/libsys/syscalls.map b/lib/libsys/syscalls.map
	--- a/lib/libsys/syscalls.map
	+++ b/lib/libsys/syscalls.map
	@@ -829,4 +829,6 @@
	__sys_pdopenpid;
	_pddupfd;
	__sys_pddupfd;
	+ _pdptrace;
	+ __sys_pdptrace;
	};
	diff --git a/share/man/man4/rights.4 b/share/man/man4/rights.4
	--- a/share/man/man4/rights.4
	+++ b/share/man/man4/rights.4
	@@ -484,6 +484,9 @@
	.It Dv CAP_PDKILL
	Permit
	.Xr pdkill 2 .
	+.It Dv CAP_PTRACE
	+Permit debugging using
	+.Xr pdptrace 2 .
	.It Dv CAP_PDWAIT
	Permit
	.Xr pdwait 2 .
	diff --git a/sys/bsm/audit_kevents.h b/sys/bsm/audit_kevents.h
	--- a/sys/bsm/audit_kevents.h
	+++ b/sys/bsm/audit_kevents.h
	@@ -666,6 +666,7 @@
	#define AUE_INOTIFY 43272 /* FreeBSD/Linux. */
	#define AUE_PDRFORK 43273 /* FreeBSD-specific. */
	#define AUE_PDOPENPID 43274 /* FreeBSD-specific. */
	+#define AUE_PDPTRACE 43275 /* FreeBSD-specific. */

	/*
	* Darwin BSM uses a number of AUE_O_* definitions, which are aliased to the
	diff --git a/sys/compat/freebsd32/freebsd32_misc.c b/sys/compat/freebsd32/freebsd32_misc.c
	--- a/sys/compat/freebsd32/freebsd32_misc.c
	+++ b/sys/compat/freebsd32/freebsd32_misc.c
	@@ -1015,8 +1015,9 @@
	psr->sr_error = psr32->sr_error;
	}

	-int
	-freebsd32_ptrace(struct thread td, struct freebsd32_ptrace_args uap)
	+static int
	+freebsd32_ptrace_copyinout(struct thread *td, int req, bool pd_mode, pid_t pid,
	+ int pfd, lwpid_t lwpid, void *uaddr, int udata)
	{
	union {
	struct ptrace_io_desc piod;
	@@ -1050,39 +1051,32 @@

	if (!allow_ptrace)
	return (ENOSYS);
	- error = 0;

	- AUDIT_ARG_PID(uap->pid);
	- AUDIT_ARG_CMD(uap->req);
	- AUDIT_ARG_VALUE(uap->data);
	+ error = 0;
	addr = &r;
	- data = uap->data;
	- switch (uap->req) {
	+ data = udata;
	+
	+ switch (req) {
	case PT_GET_EVENT_MASK:
	case PT_GET_SC_ARGS:
	case PT_GET_SC_RET:
	break;
	case PT_SET_SC_RET:
	- if (uap->data != sizeof(r32.psr)) {
	- error = EINVAL;
	- } else {
	- error = copyin(uap->addr, &r32.psr, sizeof(r32.psr));
	- if (error == 0)
	- ptrace_sc_ret32_to_ret(&r32.psr, &r.psr);
	- }
	+ error = udata != sizeof(r32.psr) ? EINVAL :
	+ copyin(uaddr, &r32.psr, sizeof(r32.psr));
	+ if (error == 0)
	+ ptrace_sc_ret32_to_ret(&r32.psr, &r.psr);
	break;
	case PT_LWPINFO:
	- if (uap->data > sizeof(r32.pl))
	+ if (udata > sizeof(r32.pl))
	return (EINVAL);
	-
	/*
	* Pass size of native structure in 'data'. Truncate
	* if necessary to avoid siginfo.
	*/
	- data = sizeof(r.pl);
	- if (uap->data < offsetof(struct ptrace_lwpinfo32, pl_siginfo) +
	- sizeof(struct __siginfo32))
	- data = offsetof(struct ptrace_lwpinfo, pl_siginfo);
	+ data = udata < offsetof(struct ptrace_lwpinfo32,
	+ pl_siginfo) + sizeof(struct __siginfo32) ?
	+ offsetof(struct ptrace_lwpinfo, pl_siginfo) : sizeof(r.pl);
	break;
	case PT_GETREGS:
	bzero(&r.reg, sizeof(r.reg));
	@@ -1094,17 +1088,17 @@
	bzero(&r.dbreg, sizeof(r.dbreg));
	break;
	case PT_SETREGS:
	- error = copyin(uap->addr, &r.reg, sizeof(r.reg));
	+ error = copyin(uaddr, &r.reg, sizeof(r.reg));
	break;
	case PT_SETFPREGS:
	- error = copyin(uap->addr, &r.fpreg, sizeof(r.fpreg));
	+ error = copyin(uaddr, &r.fpreg, sizeof(r.fpreg));
	break;
	case PT_SETDBREGS:
	- error = copyin(uap->addr, &r.dbreg, sizeof(r.dbreg));
	+ error = copyin(uaddr, &r.dbreg, sizeof(r.dbreg));
	break;
	case PT_GETREGSET:
	case PT_SETREGSET:
	- error = copyin(uap->addr, &r32.vec, sizeof(r32.vec));
	+ error = copyin(uaddr, &r32.vec, sizeof(r32.vec));
	if (error != 0)
	break;

	@@ -1112,14 +1106,12 @@
	r.vec.iov_base = PTRIN(r32.vec.iov_base);
	break;
	case PT_SET_EVENT_MASK:
	- if (uap->data != sizeof(r.ptevents))
	- error = EINVAL;
	- else
	- error = copyin(uap->addr, &r.ptevents, uap->data);
	+ error = udata != sizeof(r.ptevents) ? EINVAL :
	+ copyin(uaddr, &r.ptevents, udata);
	break;
	case PT_IO:
	- error = copyin(uap->addr, &r32.piod, sizeof(r32.piod));
	- if (error)
	+ error = copyin(uaddr, &r32.piod, sizeof(r32.piod));
	+ if (error != 0)
	break;
	CP(r32.piod, r.piod, piod_op);
	PTRIN_CP(r32.piod, r.piod, piod_offs);
	@@ -1127,8 +1119,8 @@
	CP(r32.piod, r.piod, piod_len);
	break;
	case PT_VM_ENTRY:
	- error = copyin(uap->addr, &r32.pve, sizeof(r32.pve));
	- if (error)
	+ error = copyin(uaddr, &r32.pve, sizeof(r32.pve));
	+ if (error != 0)
	break;

	CP(r32.pve, r.pve, pve_entry);
	@@ -1143,21 +1135,18 @@
	PTRIN_CP(r32.pve, r.pve, pve_path);
	break;
	case PT_COREDUMP:
	- if (uap->data != sizeof(r32.pc))
	- error = EINVAL;
	- else
	- error = copyin(uap->addr, &r32.pc, uap->data);
	+ error = udata != sizeof(r32.pc) ? EINVAL :
	+ copyin(uaddr, &r32.pc, udata);
	+ if (error != 0)
	+ break;
	CP(r32.pc, r.pc, pc_fd);
	CP(r32.pc, r.pc, pc_flags);
	r.pc.pc_limit = PAIR32TO64(off_t, r32.pc.pc_limit);
	data = sizeof(r.pc);
	break;
	case PT_SC_REMOTE:
	- if (uap->data != sizeof(r32.sr)) {
	- error = EINVAL;
	- break;
	- }
	- error = copyin(uap->addr, &r32.sr, uap->data);
	+ error = udata != sizeof(r32.sr) ? EINVAL :
	+ copyin(uaddr, &r32.sr, udata);
	if (error != 0)
	break;
	CP(r32.sr, r.sr, pscr_syscall);
	@@ -1175,9 +1164,9 @@
	r.sr.pscr_args = pscr_args;
	break;
	case PT_GET_CHILDREN:
	- if (uap->addr == NULL)
	+ if (uaddr == NULL)
	addr = NULL;
	- else if (uap->data < 0)
	+ else if (udata < 0)
	error = EINVAL;
	else
	addr = &r.children;
	@@ -1186,17 +1175,17 @@
	error = EINVAL;
	break;
	default:
	- addr = uap->addr;
	+ addr = uaddr;
	break;
	}
	- if (error)
	+ if (error != 0)
	return (error);

	- error = kern_ptrace(td, uap->req, uap->pid, addr, data);
	- if (error)
	+ error = ptrace_action(td, req, pd_mode, pid, pfd, lwpid, addr, data);
	+ if (error != 0)
	return (error);

	- switch (uap->req) {
	+ switch (req) {
	case PT_VM_ENTRY:
	CP(r.pve, r32.pve, pve_entry);
	CP(r.pve, r32.pve, pve_timestamp);
	@@ -1207,53 +1196,51 @@
	CP(r.pve, r32.pve, pve_pathlen);
	CP(r.pve, r32.pve, pve_fileid);
	CP(r.pve, r32.pve, pve_fsid);
	- error = copyout(&r32.pve, uap->addr, sizeof(r32.pve));
	+ error = copyout(&r32.pve, uaddr, sizeof(r32.pve));
	break;
	case PT_IO:
	CP(r.piod, r32.piod, piod_len);
	- error = copyout(&r32.piod, uap->addr, sizeof(r32.piod));
	+ error = copyout(&r32.piod, uaddr, sizeof(r32.piod));
	break;
	case PT_GETREGS:
	- error = copyout(&r.reg, uap->addr, sizeof(r.reg));
	+ error = copyout(&r.reg, uaddr, sizeof(r.reg));
	break;
	case PT_GETFPREGS:
	- error = copyout(&r.fpreg, uap->addr, sizeof(r.fpreg));
	+ error = copyout(&r.fpreg, uaddr, sizeof(r.fpreg));
	break;
	case PT_GETDBREGS:
	- error = copyout(&r.dbreg, uap->addr, sizeof(r.dbreg));
	+ error = copyout(&r.dbreg, uaddr, sizeof(r.dbreg));
	break;
	case PT_GETREGSET:
	r32.vec.iov_len = r.vec.iov_len;
	- error = copyout(&r32.vec, uap->addr, sizeof(r32.vec));
	+ error = copyout(&r32.vec, uaddr, sizeof(r32.vec));
	break;
	case PT_GET_EVENT_MASK:
	/* NB: The size in uap->data is validated in kern_ptrace(). */
	- error = copyout(&r.ptevents, uap->addr, uap->data);
	+ error = copyout(&r.ptevents, uaddr, udata);
	break;
	case PT_LWPINFO:
	ptrace_lwpinfo_to32(&r.pl, &r32.pl);
	- error = copyout(&r32.pl, uap->addr, uap->data);
	+ error = copyout(&r32.pl, uaddr, udata);
	break;
	case PT_GET_SC_ARGS:
	for (i = 0; i < nitems(r.args); i++)
	r32.args[i] = (uint32_t)r.args[i];
	- error = copyout(r32.args, uap->addr, MIN(uap->data,
	- sizeof(r32.args)));
	+ error = copyout(r32.args, uaddr, MIN(udata, sizeof(r32.args)));
	break;
	case PT_GET_SC_RET:
	ptrace_sc_ret_to32(&r.psr, &r32.psr);
	- error = copyout(&r32.psr, uap->addr, MIN(uap->data,
	- sizeof(r32.psr)));
	+ error = copyout(&r32.psr, uaddr, MIN(udata, sizeof(r32.psr)));
	break;
	case PT_SC_REMOTE:
	ptrace_sc_ret_to32(&r.sr.pscr_ret, &r32.sr.pscr_ret);
	- error = copyout(&r32.sr.pscr_ret, uap->addr +
	+ error = copyout(&r32.sr.pscr_ret, (char *)uaddr +
	offsetof(struct ptrace_sc_remote32, pscr_ret),
	sizeof(r32.psr));
	break;
	case PT_GET_CHILDREN:
	- if (uap->addr != 0) {
	- error = copyout(r.children, uap->addr,
	+ if (uaddr != NULL) {
	+ error = copyout(r.children, uaddr,
	td->td_retval[0] * sizeof(struct ptrace_child));
	free(r.children, M_TEMP);
	}
	@@ -1263,6 +1250,31 @@
	return (error);
	}

	+int
	+freebsd32_ptrace(struct thread td, struct freebsd32_ptrace_args uap)
	+{
	+ int error;
	+
	+ AUDIT_ARG_PID(uap->pid);
	+ AUDIT_ARG_CMD(uap->req);
	+ AUDIT_ARG_VALUE(uap->data);
	+
	+ error = freebsd32_ptrace_copyinout(td, uap->req, false, uap->pid,
	+ -1, -1, uap->addr, uap->data);
	+ return (error);
	+}
	+
	+int
	+freebsd32_pdptrace(struct thread td, struct freebsd32_pdptrace_args uap)
	+{
	+ AUDIT_ARG_FD(uap->pfd);
	+ AUDIT_ARG_CMD(uap->req);
	+ AUDIT_ARG_VALUE(uap->data);
	+
	+ return (freebsd32_ptrace_copyinout(td, uap->req, true, -1,
	+ uap->pfd, uap->lwpid, uap->addr, uap->data));
	+}
	+
	int
	freebsd32_copyinuio(const struct iovec32 iovp, u_int iovcnt, struct uio *uiop)
	{
	diff --git a/sys/compat/freebsd32/freebsd32_proto.h b/sys/compat/freebsd32/freebsd32_proto.h
	--- a/sys/compat/freebsd32/freebsd32_proto.h
	+++ b/sys/compat/freebsd32/freebsd32_proto.h
	@@ -706,6 +706,13 @@
	char wrusage_l_[PADL_(struct __wrusage32 )]; struct __wrusage32 wrusage; char wrusage_r_[PADR_(struct __wrusage32 *)];
	char info_l_[PADL_(struct __siginfo32 )]; struct __siginfo32 info; char info_r_[PADR_(struct __siginfo32 *)];
	};
	+struct freebsd32_pdptrace_args {
	+ char req_l_[PADL_(int)]; int req; char req_r_[PADR_(int)];
	+ char pfd_l_[PADL_(int)]; int pfd; char pfd_r_[PADR_(int)];
	+ char lwpid_l_[PADL_(int)]; int lwpid; char lwpid_r_[PADR_(int)];
	+ char addr_l_[PADL_(void )]; void addr; char addr_r_[PADR_(void *)];
	+ char data_l_[PADL_(int)]; int data; char data_r_[PADR_(int)];
	+};
	int freebsd32_wait4(struct thread , struct freebsd32_wait4_args );
	int freebsd32_ptrace(struct thread , struct freebsd32_ptrace_args );
	int freebsd32_recvmsg(struct thread , struct freebsd32_recvmsg_args );
	@@ -825,6 +832,7 @@
	int freebsd32_timerfd_settime(struct thread , struct freebsd32_timerfd_settime_args );
	int freebsd32_setcred(struct thread , struct freebsd32_setcred_args );
	int freebsd32_pdwait(struct thread , struct freebsd32_pdwait_args );
	+int freebsd32_pdptrace(struct thread , struct freebsd32_pdptrace_args );

	#ifdef COMPAT_43

	@@ -1328,6 +1336,7 @@
	#define FREEBSD32_SYS_AUE_freebsd32_timerfd_settime AUE_TIMERFD
	#define FREEBSD32_SYS_AUE_freebsd32_setcred AUE_SETCRED
	#define FREEBSD32_SYS_AUE_freebsd32_pdwait AUE_PDWAIT
	+#define FREEBSD32_SYS_AUE_freebsd32_pdptrace AUE_PDPTRACE

	#undef PAD_
	#undef PADL_
	diff --git a/sys/compat/freebsd32/freebsd32_syscall.h b/sys/compat/freebsd32/freebsd32_syscall.h
	--- a/sys/compat/freebsd32/freebsd32_syscall.h
	+++ b/sys/compat/freebsd32/freebsd32_syscall.h
	@@ -522,4 +522,5 @@
	#define FREEBSD32_SYS_renameat2 602
	#define FREEBSD32_SYS_pdopenpid 603
	#define FREEBSD32_SYS_pddupfd 604
	-#define FREEBSD32_SYS_MAXSYSCALL 605
	+#define FREEBSD32_SYS_freebsd32_pdptrace 605
	+#define FREEBSD32_SYS_MAXSYSCALL 606
	diff --git a/sys/compat/freebsd32/freebsd32_syscalls.c b/sys/compat/freebsd32/freebsd32_syscalls.c
	--- a/sys/compat/freebsd32/freebsd32_syscalls.c
	+++ b/sys/compat/freebsd32/freebsd32_syscalls.c
	@@ -610,4 +610,5 @@
	"renameat2", /* 602 = renameat2 */
	"pdopenpid", /* 603 = pdopenpid */
	"pddupfd", /* 604 = pddupfd */
	+ "freebsd32_pdptrace", /* 605 = freebsd32_pdptrace */
	};
	diff --git a/sys/compat/freebsd32/freebsd32_sysent.c b/sys/compat/freebsd32/freebsd32_sysent.c
	--- a/sys/compat/freebsd32/freebsd32_sysent.c
	+++ b/sys/compat/freebsd32/freebsd32_sysent.c
	@@ -672,4 +672,5 @@
	{ .sy_narg = AS(renameat2_args), .sy_call = (sy_call_t )sys_renameat2, .sy_auevent = AUE_RENAMEAT, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, / 602 = renameat2 */
	{ .sy_narg = AS(pdopenpid_args), .sy_call = (sy_call_t )sys_pdopenpid, .sy_auevent = AUE_PDOPENPID, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC }, / 603 = pdopenpid */
	{ .sy_narg = AS(pddupfd_args), .sy_call = (sy_call_t )sys_pddupfd, .sy_auevent = AUE_NULL, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC }, / 604 = pddupfd */
	+ { .sy_narg = AS(freebsd32_pdptrace_args), .sy_call = (sy_call_t )freebsd32_pdptrace, .sy_auevent = AUE_PDPTRACE, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC }, / 605 = freebsd32_pdptrace */
	};
	diff --git a/sys/compat/freebsd32/freebsd32_systrace_args.c b/sys/compat/freebsd32/freebsd32_systrace_args.c
	--- a/sys/compat/freebsd32/freebsd32_systrace_args.c
	+++ b/sys/compat/freebsd32/freebsd32_systrace_args.c
	@@ -3475,6 +3475,17 @@
	*n_args = 3;
	break;
	}
	+ /* freebsd32_pdptrace */
	+ case 605: {
	+ struct freebsd32_pdptrace_args *p = params;
	+ iarg[a++] = p->req; /* int */
	+ iarg[a++] = p->pfd; /* int */
	+ iarg[a++] = p->lwpid; /* int */
	+ uarg[a++] = (intptr_t)p->addr; /* void * */
	+ iarg[a++] = p->data; /* int */
	+ *n_args = 5;
	+ break;
	+ }
	default:
	*n_args = 0;
	break;
	@@ -9393,6 +9404,28 @@
	break;
	};
	break;
	+ /* freebsd32_pdptrace */
	+ case 605:
	+ switch (ndx) {
	+ case 0:
	+ p = "int";
	+ break;
	+ case 1:
	+ p = "int";
	+ break;
	+ case 2:
	+ p = "int";
	+ break;
	+ case 3:
	+ p = "userland void *";
	+ break;
	+ case 4:
	+ p = "int";
	+ break;
	+ default:
	+ break;
	+ };
	+ break;
	default:
	break;
	};
	@@ -11336,6 +11369,11 @@
	if (ndx == 0 \|\| ndx == 1)
	p = "int";
	break;
	+ /* freebsd32_pdptrace */
	+ case 605:
	+ if (ndx == 0 \|\| ndx == 1)
	+ p = "int";
	+ break;
	default:
	break;
	};
	diff --git a/sys/kern/init_sysent.c b/sys/kern/init_sysent.c
	--- a/sys/kern/init_sysent.c
	+++ b/sys/kern/init_sysent.c
	@@ -671,4 +671,5 @@
	{ .sy_narg = AS(renameat2_args), .sy_call = (sy_call_t )sys_renameat2, .sy_auevent = AUE_RENAMEAT, .sy_flags = SYF_CAPENABLED, .sy_thrcnt = SY_THR_STATIC }, / 602 = renameat2 */
	{ .sy_narg = AS(pdopenpid_args), .sy_call = (sy_call_t )sys_pdopenpid, .sy_auevent = AUE_PDOPENPID, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC }, / 603 = pdopenpid */
	{ .sy_narg = AS(pddupfd_args), .sy_call = (sy_call_t )sys_pddupfd, .sy_auevent = AUE_NULL, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC }, / 604 = pddupfd */
	+ { .sy_narg = AS(pdptrace_args), .sy_call = (sy_call_t )sys_pdptrace, .sy_auevent = AUE_PDPTRACE, .sy_flags = 0, .sy_thrcnt = SY_THR_STATIC }, / 605 = pdptrace */
	};
	diff --git a/sys/kern/kern_descrip.c b/sys/kern/kern_descrip.c
	--- a/sys/kern/kern_descrip.c
	+++ b/sys/kern/kern_descrip.c
	@@ -1906,7 +1906,7 @@
	/*
	* Fill the given filecaps structure with full rights.
	*/
	-static void
	+void
	filecaps_fill(struct filecaps *fcaps)
	{

	diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c
	--- a/sys/kern/kern_fork.c
	+++ b/sys/kern/kern_fork.c
	@@ -41,6 +41,7 @@
	#include <sys/systm.h>
	#include <sys/acct.h>
	#include <sys/bitstring.h>
	+#include <sys/capsicum.h>
	#include <sys/eventhandler.h>
	#include <sys/exterrvar.h>
	#include <sys/fcntl.h>
	@@ -119,6 +120,7 @@
	sys_pdfork(struct thread td, struct pdfork_args uap)
	{
	struct fork_req fr;
	+ struct filecaps fcaps;
	int error, fd, pid;

	bzero(&fr, sizeof(fr));
	@@ -126,6 +128,10 @@
	fr.fr_pidp = &pid;
	fr.fr_pd_fd = &fd;
	fr.fr_pd_flags = uap->flags;
	+ filecaps_fill(&fcaps);
	+ if ((uap->flags & PD_PTRACE_CAP) == 0)
	+ cap_rights_clear(&fcaps.fc_rights, CAP_PTRACE);
	+ fr.fr_pd_fcaps = &fcaps;
	AUDIT_ARG_FFLAGS(uap->flags);
	/*
	* It is necessary to return fd by reference because 0 is a valid file
	@@ -194,6 +200,7 @@
	sys_pdrfork(struct thread td, struct pdrfork_args uap)
	{
	struct fork_req fr;
	+ struct filecaps fcaps;
	int error, fd, pid;

	bzero(&fr, sizeof(fr));
	@@ -226,6 +233,10 @@
	fr.fr_pidp = &pid;
	fr.fr_pd_fd = &fd;
	fr.fr_pd_flags = uap->pdflags;
	+ filecaps_fill(&fcaps);
	+ if ((uap->pdflags & PD_PTRACE_CAP) == 0)
	+ cap_rights_clear(&fcaps.fc_rights, CAP_PTRACE);
	+ fr.fr_pd_fcaps = &fcaps;
	error = fork1(td, &fr);
	if (error == 0) {
	td->td_retval[0] = pid;
	@@ -1068,6 +1079,7 @@
	fr->fr_pd_flags, fr->fr_pd_fcaps);
	if (error != 0)
	goto fail2;
	+ fr->fr_pd_fcaps = NULL;
	AUDIT_ARG_FD(*fr->fr_pd_fd);
	}

	@@ -1163,6 +1175,8 @@
	fdclose(td, fp_procdesc, *fr->fr_pd_fd);
	fdrop(fp_procdesc, td);
	}
	+ if (fr->fr_pd_fcaps != NULL)
	+ filecaps_free(fr->fr_pd_fcaps);
	atomic_add_int(&nprocs, -1);
	cleanup:
	if (killsx_locked)
	diff --git a/sys/kern/subr_capability.c b/sys/kern/subr_capability.c
	--- a/sys/kern/subr_capability.c
	+++ b/sys/kern/subr_capability.c
	@@ -93,6 +93,7 @@
	const cap_rights_t cap_pdkill_rights = CAP_RIGHTS_INITIALIZER(CAP_PDKILL);
	const cap_rights_t cap_pdwait_rights = CAP_RIGHTS_INITIALIZER(CAP_PDWAIT);
	const cap_rights_t cap_pread_rights = CAP_RIGHTS_INITIALIZER(CAP_PREAD);
	+const cap_rights_t cap_ptrace_rights = CAP_RIGHTS_INITIALIZER(CAP_PTRACE);
	const cap_rights_t cap_pwrite_rights = CAP_RIGHTS_INITIALIZER(CAP_PWRITE);
	const cap_rights_t cap_read_rights = CAP_RIGHTS_INITIALIZER(CAP_READ);
	const cap_rights_t cap_recv_rights = CAP_RIGHTS_INITIALIZER(CAP_RECV);
	diff --git a/sys/kern/sys_procdesc.c b/sys/kern/sys_procdesc.c
	--- a/sys/kern/sys_procdesc.c
	+++ b/sys/kern/sys_procdesc.c
	@@ -692,6 +692,7 @@
	{
	struct file *fp;
	struct procdesc *pdf;
	+ struct filecaps fcaps;
	int error, fd, fflags;

	error = falloc_noinstall(td, &fp);
	@@ -701,13 +702,16 @@
	pdf = procdesc_alloc(flags);
	if ((flags & PD_DAEMON) != 0)
	fp->f_pdflags \|= F_PD_NOKILL;
	+ filecaps_fill(&fcaps);
	+ if ((flags & PD_PTRACE_CAP) == 0)
	+ cap_rights_clear(&fcaps.fc_rights, CAP_PTRACE);

	sx_xlock(&proctree_lock);
	error = pdopenpid1(td, pid, &pdf, fp);
	sx_xunlock(&proctree_lock);

	if (error == 0) {
	- error = finstall(td, fp, &fd, fflags, NULL);
	+ error = finstall(td, fp, &fd, fflags, &fcaps);
	if (error == 0) {
	td->td_retval[0] = fd;
	} else {
	@@ -716,6 +720,7 @@
	* return file descriptor to userspace.
	*/
	fp->f_pdflags \|= F_PD_NOKILL \| F_PD_NOFINSTALL;
	+ filecaps_free(&fcaps);
	}
	}
	fdrop(fp, td);
	diff --git a/sys/kern/sys_process.c b/sys/kern/sys_process.c
	--- a/sys/kern/sys_process.c
	+++ b/sys/kern/sys_process.c
	@@ -32,7 +32,7 @@
	*/

	#include <sys/systm.h>
	-#include <sys/caprights.h>
	+#include <sys/capsicum.h>
	#include <sys/filedesc.h>
	#include <sys/imgact.h>
	#include <sys/ktr.h>
	@@ -43,6 +43,7 @@
	#include <sys/mutex.h>
	#include <sys/priv.h>
	#include <sys/proc.h>
	+#include <sys/procdesc.h>
	#include <sys/ptrace.h>
	#include <sys/reg.h>
	#include <sys/rwlock.h>
	@@ -714,8 +715,9 @@
	};
	#endif

	-int
	-sys_ptrace(struct thread td, struct ptrace_args uap)
	+static int
	+ptrace_copyinout(struct thread *td, int req, bool pd_mode, pid_t pid, int pfd,
	+ lwpid_t lwpid, void *uaddr, int udata)
	{
	/*
	* XXX this obfuscation is to reduce stack usage, but the register
	@@ -742,23 +744,19 @@

	if (!allow_ptrace)
	return (ENOSYS);
	- error = 0;

	- AUDIT_ARG_PID(uap->pid);
	- AUDIT_ARG_CMD(uap->req);
	- AUDIT_ARG_VALUE(uap->data);
	+ error = 0;
	addr = &r;
	- switch (uap->req) {
	+
	+ switch (req) {
	case PT_GET_EVENT_MASK:
	case PT_LWPINFO:
	case PT_GET_SC_ARGS:
	case PT_GET_SC_RET:
	break;
	case PT_SET_SC_RET:
	- if (uap->data != sizeof(r.psr))
	- error = EINVAL;
	- else
	- error = copyin(uap->addr, &r.psr, sizeof(r.psr));
	+ error = udata != sizeof(r.psr) ? EINVAL :
	+ copyin(uaddr, &r.psr, sizeof(r.psr));
	break;
	case PT_GETREGS:
	bzero(&r.reg, sizeof(r.reg));
	@@ -771,41 +769,34 @@
	break;
	case PT_GETREGSET:
	case PT_SETREGSET:
	- error = copyin(uap->addr, &r.vec, sizeof(r.vec));
	+ error = copyin(uaddr, &r.vec, sizeof(r.vec));
	break;
	case PT_SETREGS:
	- error = copyin(uap->addr, &r.reg, sizeof(r.reg));
	+ error = copyin(uaddr, &r.reg, sizeof(r.reg));
	break;
	case PT_SETFPREGS:
	- error = copyin(uap->addr, &r.fpreg, sizeof(r.fpreg));
	+ error = copyin(uaddr, &r.fpreg, sizeof(r.fpreg));
	break;
	case PT_SETDBREGS:
	- error = copyin(uap->addr, &r.dbreg, sizeof(r.dbreg));
	+ error = copyin(uaddr, &r.dbreg, sizeof(r.dbreg));
	break;
	case PT_SET_EVENT_MASK:
	- if (uap->data != sizeof(r.ptevents))
	- error = EINVAL;
	- else
	- error = copyin(uap->addr, &r.ptevents, uap->data);
	+ error = udata != sizeof(r.ptevents) ? EINVAL :
	+ copyin(uaddr, &r.ptevents, udata);
	break;
	case PT_IO:
	- error = copyin(uap->addr, &r.piod, sizeof(r.piod));
	+ error = copyin(uaddr, &r.piod, sizeof(r.piod));
	break;
	case PT_VM_ENTRY:
	- error = copyin(uap->addr, &r.pve, sizeof(r.pve));
	+ error = copyin(uaddr, &r.pve, sizeof(r.pve));
	break;
	case PT_COREDUMP:
	- if (uap->data != sizeof(r.pc))
	- error = EINVAL;
	- else
	- error = copyin(uap->addr, &r.pc, uap->data);
	+ error = udata != sizeof(r.pc) ? EINVAL :
	+ copyin(uaddr, &r.pc, udata);
	break;
	case PT_SC_REMOTE:
	- if (uap->data != sizeof(r.sr)) {
	- error = EINVAL;
	- break;
	- }
	- error = copyin(uap->addr, &r.sr, uap->data);
	+ error = udata != sizeof(r.sr) ? EINVAL :
	+ copyin(uaddr, &r.sr, udata);
	if (error != 0)
	break;
	if (r.sr.pscr_nargs > nitems(td->td_sa.args)) {
	@@ -819,9 +810,9 @@
	r.sr.pscr_args = pscr_args;
	break;
	case PT_GET_CHILDREN:
	- if (uap->addr == NULL)
	+ if (uaddr == NULL)
	addr = NULL;
	- else if (uap->data < 0)
	+ else if (udata < 0)
	error = EINVAL;
	else
	addr = &r.children;
	@@ -830,59 +821,57 @@
	error = EINVAL;
	break;
	default:
	- addr = uap->addr;
	+ addr = uaddr;
	break;
	}
	if (error != 0)
	return (error);

	- error = kern_ptrace(td, uap->req, uap->pid, addr, uap->data);
	+ error = ptrace_action(td, req, pd_mode, pid, pfd, lwpid, addr, udata);
	if (error != 0)
	return (error);

	- switch (uap->req) {
	+ switch (req) {
	case PT_VM_ENTRY:
	- error = copyout(&r.pve, uap->addr, sizeof(r.pve));
	+ error = copyout(&r.pve, uaddr, sizeof(r.pve));
	break;
	case PT_IO:
	- error = copyout(&r.piod, uap->addr, sizeof(r.piod));
	+ error = copyout(&r.piod, uaddr, sizeof(r.piod));
	break;
	case PT_GETREGS:
	- error = copyout(&r.reg, uap->addr, sizeof(r.reg));
	+ error = copyout(&r.reg, uaddr, sizeof(r.reg));
	break;
	case PT_GETFPREGS:
	- error = copyout(&r.fpreg, uap->addr, sizeof(r.fpreg));
	+ error = copyout(&r.fpreg, uaddr, sizeof(r.fpreg));
	break;
	case PT_GETDBREGS:
	- error = copyout(&r.dbreg, uap->addr, sizeof(r.dbreg));
	+ error = copyout(&r.dbreg, uaddr, sizeof(r.dbreg));
	break;
	case PT_GETREGSET:
	- error = copyout(&r.vec, uap->addr, sizeof(r.vec));
	+ error = copyout(&r.vec, uaddr, sizeof(r.vec));
	break;
	case PT_GET_EVENT_MASK:
	- /* NB: The size in uap->data is validated in kern_ptrace(). */
	- error = copyout(&r.ptevents, uap->addr, uap->data);
	+ /* NB: The size in uap->data is validated in ptraceimpl(). */
	+ error = copyout(&r.ptevents, uaddr, udata);
	break;
	case PT_LWPINFO:
	- /* NB: The size in uap->data is validated in kern_ptrace(). */
	- error = copyout(&r.pl, uap->addr, uap->data);
	+ /* NB: The size in uap->data is validated in ptraceimpl(). */
	+ error = copyout(&r.pl, uaddr, udata);
	break;
	case PT_GET_SC_ARGS:
	- error = copyout(r.args, uap->addr, MIN(uap->data,
	- sizeof(r.args)));
	+ error = copyout(r.args, uaddr, MIN(udata, sizeof(r.args)));
	break;
	case PT_GET_SC_RET:
	- error = copyout(&r.psr, uap->addr, MIN(uap->data,
	- sizeof(r.psr)));
	+ error = copyout(&r.psr, uaddr, MIN(udata, sizeof(r.psr)));
	break;
	case PT_SC_REMOTE:
	- error = copyout(&r.sr.pscr_ret, uap->addr +
	+ error = copyout(&r.sr.pscr_ret, (char *)uaddr +
	offsetof(struct ptrace_sc_remote, pscr_ret),
	sizeof(r.sr.pscr_ret));
	break;
	case PT_GET_CHILDREN:
	- if (uap->addr != NULL) {
	- error = copyout(r.children, uap->addr,
	+ if (uaddr != NULL) {
	+ error = copyout(r.children, uaddr,
	td->td_retval[0] * sizeof(struct ptrace_child));
	free(r.children, M_TEMP);
	}
	@@ -1056,7 +1045,8 @@
	}

	int
	-kern_ptrace(struct thread td, int req, pid_t pid, void addr, int data)
	+ptrace_action(struct thread *td, int req, bool pd_mode, pid_t pid, int pfd,
	+ lwpid_t lwpid, void *addr, int data)
	{
	struct iovec iov;
	struct uio uio;
	@@ -1070,6 +1060,7 @@
	struct ptrace_coredump *pc;
	struct thr_coredump_req *tcq;
	struct thr_syscall_req *tsr;
	+ struct file *pfp;
	struct ptrace_child children, ptc;
	int error, num, num1, tmp;
	lwpid_t tid = 0, *buf;
	@@ -1081,6 +1072,7 @@
	curp = td->td_proc;
	proctree_locked = false;
	p2_req_set = false;
	+ pfp = NULL;

	/* Lock proctree before locking the process. */
	switch (req) {
	@@ -1108,24 +1100,42 @@
	if (req == PT_TRACE_ME) {
	p = td->td_proc;
	PROC_LOCK(p);
	- } else {
	- if (pid <= PID_MAX) {
	- if ((p = pfind(pid)) == NULL) {
	- if (proctree_locked)
	- sx_xunlock(&proctree_lock);
	- return (ESRCH);
	+ } else if (pd_mode) {
	+ if (!proctree_locked)
	+ sx_slock(&proctree_lock);
	+ error = fget_procdesc(td, pfd, &cap_ptrace_rights, EINVAL,
	+ &pfp, NULL, &p);
	+ if (!proctree_locked)
	+ sx_sunlock(&proctree_lock);
	+ if (error != 0)
	+ goto fail_proctree;
	+ pid = p->p_pid;
	+ if (lwpid != -1) {
	+ FOREACH_THREAD_IN_PROC(p, td2) {
	+ if (td2->td_tid == lwpid)
	+ break;
	}
	- } else {
	- td2 = tdfind(pid, -1);
	if (td2 == NULL) {
	- if (proctree_locked)
	- sx_xunlock(&proctree_lock);
	- return (ESRCH);
	+ PROC_UNLOCK(p);
	+ error = ESRCH;
	+ goto fail_proctree;
	}
	- p = td2->td_proc;
	- tid = pid;
	- pid = p->p_pid;
	+ tid = td->td_tid;
	}
	+ } else if (pid <= PID_MAX) {
	+ if ((p = pfind(pid)) == NULL) {
	+ error = ESRCH;
	+ goto fail_proctree;
	+ }
	+ } else {
	+ td2 = tdfind(pid, -1);
	+ if (td2 == NULL) {
	+ error = ESRCH;
	+ goto fail_proctree;
	+ }
	+ p = td2->td_proc;
	+ tid = pid;
	+ pid = p->p_pid;
	}
	AUDIT_ARG_PROCESS(p);

	@@ -2021,9 +2031,46 @@
	p->p_flag2 &= ~P2_PTRACEREQ;
	}
	PROC_UNLOCK(p);
	+fail_proctree:
	if (proctree_locked)
	sx_xunlock(&proctree_lock);
	+ if (pfp != NULL)
	+ fdrop(pfp, td);
	return (error);
	}
	#undef PROC_READ
	#undef PROC_WRITE
	+
	+int
	+kern_ptrace(struct thread td, int req, pid_t pid, void addr, int data)
	+{
	+ return (ptrace_action(td, req, pid, false, -1, -1, addr, data));
	+}
	+
	+int
	+sys_ptrace(struct thread td, struct ptrace_args uap)
	+{
	+ int error;
	+
	+ AUDIT_ARG_PID(uap->pid);
	+ AUDIT_ARG_CMD(uap->req);
	+ AUDIT_ARG_VALUE(uap->data);
	+
	+ error = ptrace_copyinout(td, uap->req, false, uap->pid, -1, -1,
	+ uap->addr, uap->data);
	+ return (error);
	+}
	+
	+int
	+sys_pdptrace(struct thread td, struct pdptrace_args uap)
	+{
	+ int error;
	+
	+ AUDIT_ARG_FD(uap->pfd);
	+ AUDIT_ARG_CMD(uap->req);
	+ AUDIT_ARG_VALUE(uap->data);
	+
	+ error = ptrace_copyinout(td, uap->req, true, -1, uap->pfd, uap->lwpid,
	+ uap->addr, uap->data);
	+ return (error);
	+}
	diff --git a/sys/kern/syscalls.c b/sys/kern/syscalls.c
	--- a/sys/kern/syscalls.c
	+++ b/sys/kern/syscalls.c
	@@ -610,4 +610,5 @@
	"renameat2", /* 602 = renameat2 */
	"pdopenpid", /* 603 = pdopenpid */
	"pddupfd", /* 604 = pddupfd */
	+ "pdptrace", /* 605 = pdptrace */
	};
	diff --git a/sys/kern/syscalls.master b/sys/kern/syscalls.master
	--- a/sys/kern/syscalls.master
	+++ b/sys/kern/syscalls.master
	@@ -3442,5 +3442,14 @@
	int flags
	);
	}
	+605 AUE_PDPTRACE STD {
	+ int pdptrace(
	+ int req,
	+ int pfd,
	+ int lwpid,
	+ _Inout_opt_ _Contains_long_ptr_ void *addr,
	+ int data
	+ );
	+ }

	; vim: syntax=off
	diff --git a/sys/kern/systrace_args.c b/sys/kern/systrace_args.c
	--- a/sys/kern/systrace_args.c
	+++ b/sys/kern/systrace_args.c
	@@ -3572,6 +3572,17 @@
	*n_args = 3;
	break;
	}
	+ /* pdptrace */
	+ case 605: {
	+ struct pdptrace_args *p = params;
	+ iarg[a++] = p->req; /* int */
	+ iarg[a++] = p->pfd; /* int */
	+ iarg[a++] = p->lwpid; /* int */
	+ uarg[a++] = (intptr_t)p->addr; /* void * */
	+ iarg[a++] = p->data; /* int */
	+ *n_args = 5;
	+ break;
	+ }
	default:
	*n_args = 0;
	break;
	@@ -9567,6 +9578,28 @@
	break;
	};
	break;
	+ /* pdptrace */
	+ case 605:
	+ switch (ndx) {
	+ case 0:
	+ p = "int";
	+ break;
	+ case 1:
	+ p = "int";
	+ break;
	+ case 2:
	+ p = "int";
	+ break;
	+ case 3:
	+ p = "userland void *";
	+ break;
	+ case 4:
	+ p = "int";
	+ break;
	+ default:
	+ break;
	+ };
	+ break;
	default:
	break;
	};
	@@ -11605,6 +11638,11 @@
	if (ndx == 0 \|\| ndx == 1)
	p = "int";
	break;
	+ /* pdptrace */
	+ case 605:
	+ if (ndx == 0 \|\| ndx == 1)
	+ p = "int";
	+ break;
	default:
	break;
	};
	diff --git a/sys/sys/caprights.h b/sys/sys/caprights.h
	--- a/sys/sys/caprights.h
	+++ b/sys/sys/caprights.h
	@@ -95,6 +95,7 @@
	extern const cap_rights_t cap_pdkill_rights;
	extern const cap_rights_t cap_pdwait_rights;
	extern const cap_rights_t cap_pread_rights;
	+extern const cap_rights_t cap_ptrace_rights;
	extern const cap_rights_t cap_pwrite_rights;
	extern const cap_rights_t cap_read_rights;
	extern const cap_rights_t cap_recv_rights;
	diff --git a/sys/sys/capsicum.h b/sys/sys/capsicum.h
	--- a/sys/sys/capsicum.h
	+++ b/sys/sys/capsicum.h
	@@ -299,7 +299,9 @@
	/* Allows pddupfd(2). */
	#define CAP_PDDUPFD CAPRIGHT(1, 0x0000000000800000ULL)

	-#define CAP_UNUSED1_25 CAPRIGHT(1, 0x0000000001000000ULL)
	+/* Allows ptrace(PT_PROCDESC) */
	+#define CAP_PTRACE CAPRIGHT(1, 0x0000000001000000ULL)
	+
	#define CAP_UNUSED1_26 CAPRIGHT(1, 0x0000000002000000ULL)
	#define CAP_UNUSED1_27 CAPRIGHT(1, 0x0000000004000000ULL)
	#define CAP_UNUSED1_28 CAPRIGHT(1, 0x0000000008000000ULL)
	@@ -333,8 +335,8 @@
	#define CAP_UNUSED1_56 CAPRIGHT(1, 0x0080000000000000ULL)
	#define CAP_UNUSED1_57 CAPRIGHT(1, 0x0100000000000000ULL)

	-/* All used bits for index 1. */
	-#define CAP_ALL1 CAPRIGHT(1, 0x0000000000FFFFFFULL)
	+/* All default bits for index 1. */
	+#define CAP_ALL1 CAPRIGHT(1, 0x0000000001FFFFFFULL)

	/* Backward compatibility. */
	#define CAP_POLL_EVENT CAP_EVENT
	diff --git a/sys/sys/filedesc.h b/sys/sys/filedesc.h
	--- a/sys/sys/filedesc.h
	+++ b/sys/sys/filedesc.h
	@@ -243,6 +243,7 @@
	bool filecaps_copy(const struct filecaps src, struct filecaps dst,
	bool locked);
	void filecaps_move(struct filecaps src, struct filecaps dst);
	+void filecaps_fill(struct filecaps *fcaps);
	void filecaps_free(struct filecaps *fcaps);

	int closef(struct file fp, struct thread td);
	diff --git a/sys/sys/procdesc.h b/sys/sys/procdesc.h
	--- a/sys/sys/procdesc.h
	+++ b/sys/sys/procdesc.h
	@@ -151,6 +151,7 @@
	int pdwait(int, int , int, struct __wrusage , struct __siginfo *);
	int pddupfd(int, int, int);
	pid_t pdrfork_thread(int , int, int, void , int ()(void ), void *);
	+int pdptrace(int, int, int, void *, int);
	__END_DECLS

	#endif /* _KERNEL */
	@@ -161,8 +162,10 @@
	#define PD_DAEMON 0x00000001 /* Don't exit when procdesc closes. */
	#define PD_CLOEXEC 0x00000002 /* Close file descriptor on exec. */
	#define PD_NOWAITPID 0x00000004 /* Reap without waitpid(). */
	+#define PD_PTRACE_CAP 0x00000008 /* Allow PT_PROCDESC in cap mode. */

	-#define PD_ALLOWED_AT_FORK (PD_DAEMON \| PD_CLOEXEC \| PD_NOWAITPID)
	-#define PD_ALLOWED_AT_OPENPID (PD_DAEMON \| PD_CLOEXEC)
	+#define PD_ALLOWED_AT_FORK \
	+ (PD_DAEMON \| PD_CLOEXEC \| PD_NOWAITPID \| PD_PTRACE_CAP)
	+#define PD_ALLOWED_AT_OPENPID (PD_DAEMON \| PD_CLOEXEC \| PD_PTRACE_CAP)

	#endif /* !_SYS_PROCDESC_H_ */
	diff --git a/sys/sys/ptrace.h b/sys/sys/ptrace.h
	--- a/sys/sys/ptrace.h
	+++ b/sys/sys/ptrace.h
	@@ -291,6 +291,8 @@
	#endif

	void ptrace_unsuspend(struct proc *p);
	+int ptrace_action(struct thread *td, int req, bool pd_mode, pid_t pid,
	+ int pfd, lwpid_t lwpid, void *addr, int data);

	extern bool allow_ptrace;

	diff --git a/sys/sys/syscall.h b/sys/sys/syscall.h
	--- a/sys/sys/syscall.h
	+++ b/sys/sys/syscall.h
	@@ -543,4 +543,5 @@
	#define SYS_renameat2 602
	#define SYS_pdopenpid 603
	#define SYS_pddupfd 604
	-#define SYS_MAXSYSCALL 605
	+#define SYS_pdptrace 605
	+#define SYS_MAXSYSCALL 606
	diff --git a/sys/sys/syscall.mk b/sys/sys/syscall.mk
	--- a/sys/sys/syscall.mk
	+++ b/sys/sys/syscall.mk
	@@ -446,4 +446,5 @@
	pdwait.o \
	renameat2.o \
	pdopenpid.o \
	- pddupfd.o
	+ pddupfd.o \
	+ pdptrace.o
	diff --git a/sys/sys/syscallsubr.h b/sys/sys/syscallsubr.h
	--- a/sys/sys/syscallsubr.h
	+++ b/sys/sys/syscallsubr.h
	@@ -299,6 +299,8 @@
	off_t len);
	int kern_fspacectl(struct thread *td, int fd, int cmd,
	const struct spacectl_range , int flags, struct spacectl_range );
	+int kern_pdptrace(struct thread td, int req, int pfd, void addr,
	+ int data);
	int kern_pdwait(struct thread td, int fd, int status,
	int options, struct __wrusage wrusage, siginfo_t sip);
	int kern_procctl(struct thread *td, enum idtype idtype, id_t id, int com,
	diff --git a/sys/sys/sysproto.h b/sys/sys/sysproto.h
	--- a/sys/sys/sysproto.h
	+++ b/sys/sys/sysproto.h
	@@ -1941,6 +1941,13 @@
	char fd_l_[PADL_(int)]; int fd; char fd_r_[PADR_(int)];
	char flags_l_[PADL_(int)]; int flags; char flags_r_[PADR_(int)];
	};
	+struct pdptrace_args {
	+ char req_l_[PADL_(int)]; int req; char req_r_[PADR_(int)];
	+ char pfd_l_[PADL_(int)]; int pfd; char pfd_r_[PADR_(int)];
	+ char lwpid_l_[PADL_(int)]; int lwpid; char lwpid_r_[PADR_(int)];
	+ char addr_l_[PADL_(void )]; void addr; char addr_r_[PADR_(void *)];
	+ char data_l_[PADL_(int)]; int data; char data_r_[PADR_(int)];
	+};
	int sys__exit(struct thread , struct _exit_args );
	int sys_fork(struct thread , struct fork_args );
	int sys_read(struct thread , struct read_args );
	@@ -2353,6 +2360,7 @@
	int sys_renameat2(struct thread , struct renameat2_args );
	int sys_pdopenpid(struct thread , struct pdopenpid_args );
	int sys_pddupfd(struct thread , struct pddupfd_args );
	+int sys_pdptrace(struct thread , struct pdptrace_args );

	#ifdef COMPAT_43

	@@ -3357,6 +3365,7 @@
	#define SYS_AUE_renameat2 AUE_RENAMEAT
	#define SYS_AUE_pdopenpid AUE_PDOPENPID
	#define SYS_AUE_pddupfd AUE_NULL
	+#define SYS_AUE_pdptrace AUE_PDPTRACE

	#undef PAD_
	#undef PADL_

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