BINMISCCTL(8) FreeBSD System Manager's Manual BINMISCCTL(8)
NAME
binmiscctl - manage binary image activators
SYNOPSIS
binmiscctl add name --interpreter path --magic magic --size size
[--mask mask] [--offset offset] [--set-enabled]
binmiscctl disable name
binmiscctl enable name
binmiscctl list
binmiscctl lookup name
binmiscctl remove name
DESCRIPTION
The binmiscctl 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.
The first argument on the command line indicates the operation to be
performed. Operation must be one of the following:
add name --interpreter path --magic magic --size size [--mask mask]
[--offset offset] [--set-enabled]
Add a new activator entry in the kernel. You must specify a
unique name, a path to the interpreter, header magic bytes that
uniquely identify a suitable binary for the activator, and the
size of the magic in bytes.
Optionally, you may specify a 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.
An offset may be specified for the magic bytes using the --offset
option. By default the offset is zero.
To enable the activator entry the --set-enabled option is used.
The activator default state is disabled.
The interpreter path may also contain arguments for the
interpreter including #a which gets replaced by the old argv0
value in the interpreter string.
disable name
Disable the activator entry identified with name.
enable name
Enable the activator entry identified with name.
list Take a snapshot and print all the activator entries currently
configured.
lookup name
Look up and print out the activator entry identified with name.
remove name
Remove the activator entry identified with name.
EXAMPLES
Add an image activator to run the LLVM interpreter (lli(1)) on bitcode
compiled files and set its state to enabled. In this example #a is
replaced with the old argv0 value so that lli(1) can fake its argv0:
# binmiscctl add llvmbc --interpreter ''/usr/bin/lli \
--fake-argv0=#a'' --magic ''BC\xc0\xde'' --size 4 \
--set-enabled
Set the state of the llvmbc image activator to disabled:
# binmiscctl disable llvmbc
Set the state of the llvmbc image activator to enabled:
# binmiscctl enable llvmbc
Delete the llvmbc image activator:
# binmiscctl remove llvmbc
Look up and list the record for the llvmbc image activator:
# binmiscctl lookup llvmbc
Add QEMU bsd-user program as an image activator for ARM AARCH64 binaries:
# binmiscctl add arm64 \
--interpreter "/usr/local/bin/qemu-aarch64-static" \
--magic "\x7f\x45\x4c\x46\x02\x01\x01\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00" \
--mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\
\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff" \
--size 20 --set-enabled
Add QEMU bsd-user program as an image activator for ARM little-endian
binaries:
# binmiscctl add armelf \
--interpreter "/usr/local/bin/qemu-arm-static" \
--magic "\x7f\x45\x4c\x46\x01\x01\x01\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00" \
--mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\
\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff" \
--size 20 --set-enabled
Add QEMU bsd-user program as an image activator for ARM big-endian
binaries:
# binmiscctl add armebelf \
--interpreter "/usr/local/bin/qemu-arm-static" \
--magic "\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28" \
--mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\
\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff" \
--size 20 --set-enabled
Add QEMU bsd-user program as an image activator for MIPS32 binaries:
# binmiscctl add mips32 \
--interpreter "/usr/local/bin/qemu-mips-static" \
--magic "\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08" \
--mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\
\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff" \
--size 20 --set-enabled
Add QEMU bsd-user program as an image activator for MIPS64 binaries:
# binmiscctl add mips64 \
--interpreter "/usr/local/bin/qemu-mips64-static" \
--magic "\x7f\x45\x4c\x46\x02\x02\x01\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08" \
--mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\
\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff" \
--size 20 --set-enabled
Add QEMU bsd-user program as an image activator for PowerPC binaries:
# binmiscctl add powerpc \
--interpreter "/usr/local/bin/qemu-ppc-static" \
--magic "\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14" \
--mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\
\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff" \
--size 20 --set-enabled
Add QEMU bsd-user program as an image activator for PowerPC64 binaries:
# binmiscctl add powerpc64 \
--interpreter "/usr/local/bin/qemu-ppc64-static" \
--magic "\x7f\x45\x4c\x46\x02\x02\x01\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15" \
--mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\
\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff" \
--size 20 --set-enabled
Add QEMU bsd-user program as an image activator for 64-bit RISC-V
binaries:
# binmiscctl add riscv64 \
--interpreter "/usr/local/bin/qemu-riscv64-static" \
--magic "\x7f\x45\x4c\x46\x02\x01\x01\x00\x00\x00\
\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00" \
--mask "\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\
\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff" \
--size 20 --set-enabled
Create and use an ARMv6 chroot on an AMD64 host
Use an existing source tree to build a chroot host with architecture
overrides:
D=/path/to/chroot
cd /usr/src
mkdir -p $D
make world TARGET=arm TARGET_ARCH=armv6 DESTDIR=$D
make distribution TARGET=arm TARGET_ARCH=armv6 DESTDIR=$D
With emulators/qemu-user-static from the FreeBSD Ports Collection, the
emulator must be copied into the jail path specified in the binmiscctl
command. Using the example above:
mkdir $D/usr/local/bin
cp /usr/local/bin/qemu-arm-static $D/usr/local/bin
Now the user can chroot into the environment normally, as root:
chroot $D
SEE ALSO
lli(1), execve(2), jail(8)
HISTORY
The binmiscctl command was added in FreeBSD 10.1. It was developed to
support the imgact_binmisc kernel module.
AUTHORS
Stacey D Son <sson@FreeBSD.org>
FreeBSD 13.1-RELEASE-p6 April 30, 2020 FreeBSD 13.1-RELEASE-p6
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