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.\"-
.\" Copyright (c) 2013 Stacey D. Son
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
.\" Support for miscellaneous binary image activators
.\"
.Dd April 10, 2014
.Dt BINMISCCTL 8
.Os
.Sh NAME
.Nm binmiscctl
.Nd manage binary image activators
.Sh SYNOPSIS
.Nm
.Cm add
.Ar name
.Cm --interpreter
.Ar path
.Cm --magic
.Ar magic
.Cm --size
.Ar size
.Op Cm --mask Ar mask
.Op Cm --offset Ar offset
.Op Cm --set-enabled
.Nm
.Cm remove
.Ar name
.Nm
.Cm disable
.Ar name
.Nm
.Cm enable
.Ar name
.Nm
.Cm lookup
.Ar name
.Nm
.Cm list
.Sh DESCRIPTION
The
.Nm
utility
is the management utility for configuring miscellaneous binaries image
activators in the kernel.
It allows adding, deleting, disabling,
enabling, and looking up interpreters.
Also, all the interpreters can
be listed.
.Pp
The first argument on the command line indicates the operation to be
performed.
Operation must be one of the following:
.Bl -tag -width indent
.It Xo
.Cm add
.Ar name
.Cm --interpreter
.Ar path
.Cm --magic
.Ar magic
.Cm --size
.Ar size
.Op Cm --mask Ar mask
.Op Cm --offset Ar offset
.Op Cm --set-enabled
.Xc
Add a new activator entry in the kernel.
You must specify a
unique
.Ar name,
interpreter path and its arguments
.Ar path,
header
.Ar magic
bytes that uniquely identify a suitable binary for the activator,
and the
.Ar size
of the
.Ar magic
in bytes.
.Pp
Optionally you may specify a
.Ar mask
to do a bitwise AND with the header bytes.
This effectively allows you to ignore fields in the binary header that
do not uniquely indentify the binary file's type.
.Pp
An
.Ar offset
may be specified for the magic bytes using the
.Cm --offset
option.
By default the
.Ar offset
is zero.
.Pp
To enable the activator entry the
.Cm --set-enabled
option is used.
The activator default state is disabled.
.Pp
The interpreter
.Ar path
may also contain arguments for the interpreter including
.Ar #a
which gets replaced by the old
.Dv argv0
value in the interpreter string.
.It Cm remove Ar name
Remove the activator entry identified with
.Ar name .
.It Cm disable Ar name
Disable the activator entry identified with
.Ar name .
.It Cm enable Ar name
Enable the activator entry identified with
.Ar name .
.It Cm lookup Ar name
Look up and print out the activator entry identified with
.Ar name .
.It Cm list
Take a snapshot and print all the activator entries currently configured.
.El
.Sh EXAMPLES
.Bl
# binmiscctl add llvmbc --interpreter ''/usr/bin/lli --fake-argv0=#a'' \\
--magic ''BC\\xc0\\xde'' --size 4 --set-enabled
.El
.Pp
Add an image activator to run the LLVM interpreter (lli) on bitcode
compiled files.
.Ar #a
gets replaced with the old
.Dv argv0
value so that 'lli' can fake its
.Dv argv0 .
Set its state to enabled.
.Pp
.Dl # binmiscctl disable llvmbc
.Pp
Set the state of the
.Ar llvmbc
image activator to disabled.
.Pp
.Dl # binmiscctl enable llvmbc
.Pp
Set the state of the
.Ar llvmbc
image activator to enabled.
.Pp
.Dl # binmiscctl remove llvmbc
.Pp
Delete the
.Ar llvmbc
image activator.
.Pp
.Dl # binmiscctl lookup llvmbc
.Pp
Look up and list the record for the
.Ar llvmbc
image activator.
.Sh SEE ALSO
.Xr lli 1 ,
.Xr execve 2
.Sh HISTORY
The
.Cm binmiscctl
command was added in
.Fx 10.1 .
It was developed to support the imgact_binmisc kernel module.
.Sh AUTHORS
Stacey D Son
|
