1.\" Copyright (c) 2019 The FreeBSD Foundation, Inc. 2.\" All rights reserved. 3.\" 4.\" This documentation was written by 5.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship 6.\" from the FreeBSD Foundation. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 17.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 18.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" 29.\" $FreeBSD$ 30.\" 31.Dd June 28, 2019 32.Dt PROCCONTROL 1 33.Os 34.Sh NAME 35.Nm proccontrol 36.Nd Control some process execution aspects 37.Sh SYNOPSIS 38.Nm 39.Fl m Ar mode 40.Op Fl s Ar control 41.Op Fl q 42.Fl p Ar pid | command 43.Sh DESCRIPTION 44The 45.Nm 46command modifies the execution parameter of existing process 47specified by the 48.Ar pid 49argument, or starts execution of the new program 50.Ar command 51with the execution parameter set for it. 52.Pp 53Which execution parameter is changed, selected by the mandatory 54parameter 55.Ar mode . 56Possible values for 57.Ar mode 58are: 59.Bl -tag -width trapcap 60.It Ar aslr 61Control the Address Space Layout Randomization. 62Only applicable to the new process spawned. 63.It Ar trace 64Control the permission for debuggers to attach. 65Note that process is only allowed to enable tracing for itself, 66not for any other process. 67.It Ar trapcap 68Controls the signalling of capability mode access violations. 69.It Ar protmax 70Controls the implicit PROT_MAX application for 71.Xr mmap 2 . 72.It Ar kpti 73Controls the KPTI enable, AMD64 only. 74.El 75.Pp 76The 77.Ar control 78specifies if the selected 79.Ar mode 80should be enabled or disabled. 81Possible values are 82.Ar enable 83and 84.Ar disable , 85with the default value being 86.Ar enable 87if not specified. 88See 89.Xr procctl 2 90for detailed description of each mode effects and interaction with other 91process control facilities. 92.Pp 93The 94.Fl q 95switch makes the utility query and print the current setting for 96the selected mode. 97The 98.Fl q 99requires the query target process specification with 100.Fl p . 101.Sh EXIT STATUS 102.Ex -std 103.Sh EXAMPLES 104.Bl -bullet 105.It 106To disable debuggers attachment to the process 1020, execute 107.Dl "proccontrol -m trace -s disable -p 1020" 108.It 109To execute the 110.Xr uniq 1 111program in a mode where capability access violations cause 112.Dv SIGTRAP 113delivery, do 114.Dl "proccontrol -m trapcap uniq" 115.It 116To query the current ASLR enablement mode for the running 117process 1020, do 118.Dl "proccontrol -m aslr -q -p 1020" 119.El 120.Sh SEE ALSO 121.Xr kill 2 , 122.Xr procctl 2 , 123.Xr ptrace 2 124.Sh HISTORY 125The 126.Nm 127command appeared in 128.Fx 10.0 . 129.Sh AUTHORS 130The 131.Nm 132command and this manual page were written by 133.An Konstantin Belousov Aq Mt kib@freebsd.org 134under sponsorship from The FreeBSD Foundation. 135