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 July 2, 2021 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 nonewprivs 73Controls disabling the setuid and sgid bits for 74.Xr execve 2 . 75.It Ar kpti 76Controls the KPTI enable, AMD64 only. 77.It Ar la48 78Control limiting usermode process address space to 48 bits of address, 79AMD64 only, on machines capable of 57-bit addressing. 80.El 81.Pp 82The 83.Ar control 84specifies if the selected 85.Ar mode 86should be enabled or disabled. 87Possible values are 88.Ar enable 89and 90.Ar disable , 91with the default value being 92.Ar enable 93if not specified. 94See 95.Xr procctl 2 96for detailed description of each mode effects and interaction with other 97process control facilities. 98.Pp 99The 100.Fl q 101switch makes the utility query and print the current setting for 102the selected mode. 103The 104.Fl q 105requires the query target process specification with 106.Fl p . 107.Sh EXIT STATUS 108.Ex -std 109.Sh EXAMPLES 110.Bl -bullet 111.It 112To disable debuggers attachment to the process 1020, execute 113.Dl "proccontrol -m trace -s disable -p 1020" 114.It 115To execute the 116.Xr uniq 1 117program in a mode where capability access violations cause 118.Dv SIGTRAP 119delivery, do 120.Dl "proccontrol -m trapcap uniq" 121.It 122To query the current ASLR enablement mode for the running 123process 1020, do 124.Dl "proccontrol -m aslr -q -p 1020" 125.El 126.Sh SEE ALSO 127.Xr kill 2 , 128.Xr procctl 2 , 129.Xr ptrace 2 130.Sh HISTORY 131The 132.Nm 133command appeared in 134.Fx 10.0 . 135.Sh AUTHORS 136The 137.Nm 138command and this manual page were written by 139.An Konstantin Belousov Aq Mt kib@freebsd.org 140under sponsorship from The FreeBSD Foundation. 141