xref: /freebsd/usr.bin/proccontrol/proccontrol.1 (revision 146537449b45fb6c35e8bbe9fe82c5131484972d)

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.\" This documentation was written by
.\" Konstantin Belousov <kib@FreeBSD.org> under sponsorship
.\" from the FreeBSD Foundation.
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.\" $FreeBSD$
.\"
.Dd February 22, 2019
.Dt PROCCONTROL 1
.Os
.Sh NAME
.Nm proccontrol
.Nd Control some process execution aspects
.Sh SYNOPSIS
.Nm
.Fl m Ar mode
.Op Fl s Ar control
.Op Fl q
.Fl p Ar pid | command
.Sh DESCRIPTION
The
.Nm
command modifies the execution parameter of existing process
specified by the
.Ar pid
argument, or starts execution of the new program
.Ar command
with the execution parameter set for it.
.Pp
Which execution parameter is changed, selected by the mandatory
parameter
.Ar mode .
Possible values for
.Ar mode
are:
.Bl -tag -width trapcap
.It Ar aslr
Control the Address Space Layout Randomization.
Only applicable to the new process spawned.
.It Ar trace
Control the permission for debuggers to attach.
.It Ar trapcap
Controls the signalling of capability mode access violations.
.El
.Pp
The
Ar control
specifies if the selected
.Ar mode
should be enabled or disabled.
Possible values are
.Ar enable
and
.Ar disable ,
with the default value being
.Ar enable
if not specified.
See
.Xr procctl 2
for detailed description of each mode effects and interaction with other
process control facilities.
.Pp
The
.Op Fl q
switch makes the utility query and print the current setting for
the selected mode.
.Sh EXIT STATUS
.Ex -std
.Sh EXAMPLES
.Bl -bullet
.It
To disable debuggers attachment to the process 1020, execute
.Dl "proccontrol -m trace -s disable -p 1020"
.It
To execute the
.Xr uniq 1
program in a mode where capability access violations cause
.Dv SIGTRAP
delivery, do
.Dl "proccontrol -m trapcap uniq"
.It
To query the current ASLR enablement mode for the running
process 1020, do
.Dl "proccontrol -m aslr -q -p 1020"
.El
.Sh SEE ALSO
.Xr kill 2 ,
.Xr procctl 2 ,
.Xr ptrace 2
.Sh HISTORY
The
.Nm
command appeared in
.Fx 10.0 .
.Sh AUTHORS
The
.Nm
command and this manual page were written by
.An Konstantin Belousov Aq Mt kib@freebsd.org
under sponsorship from The FreeBSD Foundation.