799c4f7325
numerous QEMU examples and explanations supplied by sbruno, with thanks to Ingo Schwarze for help with the mdoc markup. Code, text, testing, proofreading, cinematography, stunts, and the haunting theme song supplied by sbruno. Submitted by: sbruno Reviewed by: sbruno MFC after: 1 week
299 lines
8.4 KiB
Groff
299 lines
8.4 KiB
Groff
.\"-
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.\" Copyright (c) 2013 Stacey D. Son
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.\" Support for miscellaneous binary image activators
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.\"
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.Dd December 30, 2014
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.Dt BINMISCCTL 8
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.Os
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.Sh NAME
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.Nm binmiscctl
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.Nd manage binary image activators
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.Sh SYNOPSIS
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.Nm
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.Cm add
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.Ar name
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.Cm --interpreter
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.Ar path
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.Cm --magic
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.Ar magic
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.Cm --size
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.Ar size
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.Op Cm --mask Ar mask
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.Op Cm --offset Ar offset
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.Op Cm --set-enabled
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.Nm
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.Cm remove
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.Ar name
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.Nm
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.Cm disable
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.Ar name
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.Nm
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.Cm enable
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.Ar name
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.Nm
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.Cm lookup
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.Ar name
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.Nm
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.Cm list
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.Sh DESCRIPTION
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The
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.Nm
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utility
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is the management utility for configuring miscellaneous binaries image
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activators in the kernel.
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It allows adding, deleting, disabling,
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enabling, and looking up interpreters.
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Also, all the interpreters can
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be listed.
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.Pp
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The first argument on the command line indicates the operation to be
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performed.
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Operation must be one of the following:
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.Bl -tag -width indent
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.It Xo
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.Cm add
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.Ar name
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.Cm --interpreter
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.Ar path
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.Cm --magic
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.Ar magic
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.Cm --size
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.Ar size
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.Op Cm --mask Ar mask
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.Op Cm --offset Ar offset
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.Op Cm --set-enabled
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.Xc
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Add a new activator entry in the kernel.
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You must specify a
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unique
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.Ar name,
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interpreter path and its arguments
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.Ar path,
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header
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.Ar magic
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bytes that uniquely identify a suitable binary for the activator,
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and the
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.Ar size
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of the
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.Ar magic
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in bytes.
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.Pp
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Optionally you may specify a
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.Ar mask
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to do a bitwise AND with the header bytes.
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This effectively allows you to ignore fields in the binary header that
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do not uniquely indentify the binary file's type.
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.Pp
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An
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.Ar offset
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may be specified for the magic bytes using the
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.Cm --offset
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option.
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By default the
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.Ar offset
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is zero.
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.Pp
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To enable the activator entry the
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.Cm --set-enabled
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option is used.
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The activator default state is disabled.
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.Pp
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The interpreter
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.Ar path
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may also contain arguments for the interpreter including
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.Ar #a
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which gets replaced by the old
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.Dv argv0
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value in the interpreter string.
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.It Cm remove Ar name
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Remove the activator entry identified with
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.Ar name .
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.It Cm disable Ar name
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Disable the activator entry identified with
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.Ar name .
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.It Cm enable Ar name
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Enable the activator entry identified with
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.Ar name .
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.It Cm lookup Ar name
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Look up and print out the activator entry identified with
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.Ar name .
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.It Cm list
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Take a snapshot and print all the activator entries currently configured.
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.El
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.Sh EXAMPLES
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Add an image activator to run the LLVM interpreter (lli) on bitcode
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compiled files:
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.Bd -ragged -offset indent
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# binmiscctl add llvmbc --interpreter ''/usr/bin/lli --fake-argv0=#a''
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--magic ''BC\\xc0\\xde'' --size 4 --set-enabled
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.Ed
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.Pp
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.Ar #a
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is replaced with the old
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.Dv argv0
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value so that 'lli' can fake its
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.Dv argv0 .
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Set its state to enabled.
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.Pp
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Set the state of the
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.Ar llvmbc
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image activator to disabled:
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.Dl # binmiscctl disable llvmbc
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.Pp
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Set the state of the
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.Ar llvmbc
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image activator to enabled:
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.Dl # binmiscctl enable llvmbc
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.Pp
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Delete the
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.Ar llvmbc
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image activator:
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.Dl # binmiscctl remove llvmbc
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.Pp
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Look up and list the record for the
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.Ar llvmbc
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image activator:
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.Dl # binmiscctl lookup llvmbc
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.Pp
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Add QEMU bsd-user program as an image activator for ARM little-endian binaries:
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.Bd -literal -offset indent
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# binmiscctl add armelf \e
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--interpreter "/usr/local/bin/qemu-arm-static" \e
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--magic "\ex7f\ex45\ex4c\ex46\ex01\ex01\ex01\ex00\ex00\ex00\e
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\ex00\ex00\ex00\ex00\ex00\ex00\ex02\ex00\ex28\ex00" \e
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--mask "\exff\exff\exff\exff\exff\exff\exff\ex00\exff\exff\e
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\exff\exff\exff\exff\exff\exff\exfe\exff\exff\exff" \e
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--size 20 --set-enabled
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.Ed
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.Pp
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Add QEMU bsd-user program as an image activator for ARM big-endian binaries:
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.Bd -literal -offset indent
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# binmiscctl add armebelf \e
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--interpreter "/usr/local/bin/qemu-arm-static" \e
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--magic "\ex7f\ex45\ex4c\ex46\ex01\ex02\ex01\ex00\ex00\ex00\e
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\ex00\ex00\ex00\ex00\ex00\ex00\ex00\ex02\ex00\ex28" \e
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--mask "\exff\exff\exff\exff\exff\exff\exff\ex00\exff\exff\e
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\exff\exff\exff\exff\exff\exff\exff\exfe\exff\exff" \e
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--size 20 --set-enabled
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.Ed
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.Pp
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Add QEMU bsd-user program as an image activator for MIPS32 binaries:
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.Bd -literal -offset indent
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# binmiscctl add mips32 \e
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--interpreter "/usr/local/bin/qemu-mips-static" \e
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--magic "\ex7f\ex45\ex4c\ex46\ex01\ex02\ex01\ex00\ex00\ex00\e
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\ex00\ex00\ex00\ex00\ex00\ex00\ex00\ex02\ex00\ex08" \e
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--mask "\exff\exff\exff\exff\exff\exff\exff\ex00\exff\exff\e
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\exff\exff\exff\exff\exff\exff\exff\exfe\exff\exff" \e
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--size 20 --set-enabled
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.Ed
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.Pp
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Add QEMU bsd-user program as an image activator for MIPS64 binaries:
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.Bd -literal -offset indent
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# binmiscctl add mips64 \e
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--interpreter "/usr/local/bin/qemu-mips64-static" \e
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--magic "\ex7f\ex45\ex4c\ex46\ex02\ex02\ex01\ex00\ex00\ex00\e
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\ex00\ex00\ex00\ex00\ex00\ex00\ex00\ex02\ex00\ex08" \e
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--mask "\exff\exff\exff\exff\exff\exff\exff\ex00\exff\exff\e
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\exff\exff\exff\exff\exff\exff\exff\exfe\exff\exff" \e
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--size 20 --set-enabled
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.Ed
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.Pp
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Add QEMU bsd-user program as an image activator for PowerPC binaries:
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.Bd -literal -offset indent
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# binmiscctl add powerpc \e
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--interpreter "/usr/local/bin/qemu-ppc-static" \e
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--magic "\ex7f\ex45\ex4c\ex46\ex01\ex02\ex01\ex00\ex00\ex00\e
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\ex00\ex00\ex00\ex00\ex00\ex00\ex00\ex02\ex00\ex14" \e
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--mask "\exff\exff\exff\exff\exff\exff\exff\ex00\exff\exff\e
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\exff\exff\exff\exff\exff\exff\exff\exfe\exff\exff" \e
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--size 20 --set-enabled
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.Ed
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.Pp
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Add QEMU bsd-user program as an image activator for PowerPC64 binaries:
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.Bd -literal -offset indent
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# binmiscctl add powerpc64 \e
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--interpreter "/usr/local/bin/qemu-ppc64-static" \e
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--magic "\ex7f\ex45\ex4c\ex46\ex01\ex02\ex01\ex00\ex00\ex00\e
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\ex00\ex00\ex00\ex00\ex00\ex00\ex00\ex02\ex00\ex15" \e
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--mask "\exff\exff\exff\exff\exff\exff\exff\ex00\exff\exff\e
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\exff\exff\exff\exff\exff\exff\exff\exfe\exff\exff" \e
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--size 20 --set-enabled
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.Ed
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.Pp
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Add QEMU bsd-user program as an image activator for SPARC64 binaries:
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.Bd -literal -offset indent
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# binmiscctl add sparc64 \e
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--interpreter "/usr/local/bin/qemu-sparc64-static" \e
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--magic "\ex7f\ex45\ex4c\ex46\ex02\ex02\ex01\ex00\ex00\ex00\e
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\ex00\ex00\ex00\ex00\ex00\ex00\ex00\ex02\ex00\ex2b" \e
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--mask "\exff\exff\exff\exff\exff\exff\exff\ex00\exff\exff\e
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\exff\exff\exff\exff\exff\exff\exff\exfe\exff\exff" \e
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--size 20 --set-enabled
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.Ed
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.Pp
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.Ss "Create and use an ARMv6 chroot on an AMD64 host"
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Use an existing source tree to build a chroot host with architecture
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overrides:
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.Bd -literal
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D=/path/to/chroot
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cd /usr/src
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mkdir -p $D
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make world TARGET=arm TARGET_ARCH=armv6 DESTDIR=$D
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make distribution TARGET=arm TARGET_ARCH=armv6 DESTDIR=$D
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.Ed
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.Pp
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With
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.Pa emulators/qemu-user-static
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from the
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.Fx
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Ports Collection, the emulator must be copied into the jail path
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specified in the binmiscctl command.
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Using the example above:
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.Bd -literal
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mkdir $D/usr/local/bin
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cp /usr/local/bin/qemu-arm-static $D/usr/local/bin
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.Ed
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.Pp
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Now the user can chroot into the environment normally, as root:
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.Bd -literal
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chroot $D
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.Ed
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.Sh SEE ALSO
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.Xr lli 1 ,
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.Xr execve 2 ,
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.Xr jail 8
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.Sh HISTORY
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The
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.Cm binmiscctl
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command was added in
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.Fx 10.1 .
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It was developed to support the imgact_binmisc kernel module.
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.Sh AUTHORS
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Stacey D Son
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