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qemu/scripts/qemu-binfmt-conf.sh
Laurent Vivier 01ecd22a29 qemu-binfmt-conf.sh: add persistent (F) flags 
Since kernel commit 948b701a607f
(binfmt_misc: add persistent opened binary handler for containers)
kernel allows to load the interpreter at the configuration time.

In case of chroot, it allows to have the interpreter in the host root
filesystem and not to copy it to the chroot filesystem.

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180627205317.10343-3-laurent@vivier.eu>
2018-07-02 20:16:35 +02:00

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#!/bin/sh
# enable automatic i386/ARM/M68K/MIPS/SPARC/PPC/s390/HPPA/Xtensa/microblaze
# program execution by the kernel
qemu_target_list="i386 i486 alpha arm armeb sparc32plus ppc ppc64 ppc64le m68k \
mips mipsel mipsn32 mipsn32el mips64 mips64el \
sh4 sh4eb s390x aarch64 aarch64_be hppa riscv32 riscv64 xtensa xtensaeb microblaze microblazeel"
i386_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x03\x00'
i386_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
i386_family=i386
i486_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x06\x00'
i486_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
i486_family=i386
alpha_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x26\x90'
alpha_mask='\xff\xff\xff\xff\xff\xfe\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
alpha_family=alpha
arm_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28\x00'
arm_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
arm_family=arm
armeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x28'
armeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
armeb_family=armeb
sparc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x02'
sparc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
sparc_family=sparc
sparc32plus_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x12'
sparc32plus_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
sparc32plus_family=sparc
ppc_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x14'
ppc_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
ppc_family=ppc
ppc64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15'
ppc64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
ppc64_family=ppc
ppc64le_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x15\x00'
ppc64le_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\x00'
ppc64le_family=ppcle
m68k_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x04'
m68k_mask='\xff\xff\xff\xff\xff\xff\xfe\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
m68k_family=m68k
# FIXME: We could use the other endianness on a MIPS host.
mips_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
mips_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
mips_family=mips
mipsel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
mipsel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
mipsel_family=mips
mipsn32_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
mipsn32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
mipsn32_family=mips
mipsn32el_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
mipsn32el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
mipsn32el_family=mips
mips64_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08'
mips64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
mips64_family=mips
mips64el_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x08\x00'
mips64el_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
mips64el_family=mips
sh4_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a\x00'
sh4_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
sh4_family=sh4
sh4eb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x2a'
sh4eb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
sh4eb_family=sh4
s390x_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x16'
s390x_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
s390x_family=s390x
aarch64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7\x00'
aarch64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
aarch64_family=arm
aarch64_be_magic='\x7fELF\x02\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xb7'
aarch64_be_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
aarch64_be_family=armeb
hppa_magic='\x7f\x45\x4c\x46\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x0f'
hppa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
hppa_family=hppa
riscv32_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'
riscv32_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
riscv32_family=riscv
riscv64_magic='\x7fELF\x02\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xf3\x00'
riscv64_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
riscv64_family=riscv
xtensa_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5e\x00'
xtensa_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
xtensa_family=xtensa
xtensaeb_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\x5e'
xtensaeb_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff'
xtensaeb_family=xtensaeb
microblaze_magic='\x7fELF\x01\x02\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xba\xab'
microblaze_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
microblaze_family=microblaze
microblazeel_magic='\x7fELF\x01\x01\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02\x00\xab\xba'
microblazeel_mask='\xff\xff\xff\xff\xff\xff\xff\x00\xff\xff\xff\xff\xff\xff\xff\xff\xfe\xff\xff\xff'
microblazeel_family=microblazeel
qemu_get_family() {
cpu=${HOST_ARCH:-$(uname -m)}
case "$cpu" in
amd64|i386|i486|i586|i686|i86pc|BePC|x86_64)
echo "i386"
;;
mips*)
echo "mips"
;;
"Power Macintosh"|ppc64|powerpc|ppc)
echo "ppc"
;;
ppc64el|ppc64le)
echo "ppcle"
;;
arm|armel|armhf|arm64|armv[4-9]*l|aarch64)
echo "arm"
;;
armeb|armv[4-9]*b|aarch64_be)
echo "armeb"
;;
sparc*)
echo "sparc"
;;
riscv*)
echo "riscv"
;;
*)
echo "$cpu"
;;
esac
}
usage() {
cat <<EOF
Usage: qemu-binfmt-conf.sh [--qemu-path PATH][--debian][--systemd CPU]
[--help][--credential yes|no][--exportdir PATH]
[--persistent yes|no]
Configure binfmt_misc to use qemu interpreter
--help: display this usage
--qemu-path: set path to qemu interpreter ($QEMU_PATH)
--debian: don't write into /proc,
instead generate update-binfmts templates
--systemd: don't write into /proc,
instead generate file for systemd-binfmt.service
for the given CPU. If CPU is "ALL", generate a
file for all known cpus
--exportdir: define where to write configuration files
(default: $SYSTEMDDIR or $DEBIANDIR)
--credential: if yes, credential and security tokens are
calculated according to the binary to interpret
--persistent: if yes, the interpreter is loaded when binfmt is
configured and remains in memory. All future uses
are cloned from the open file.
To import templates with update-binfmts, use :
sudo update-binfmts --importdir ${EXPORTDIR:-$DEBIANDIR} --import qemu-CPU
To remove interpreter, use :
sudo update-binfmts --package qemu-CPU --remove qemu-CPU $QEMU_PATH
With systemd, binfmt files are loaded by systemd-binfmt.service
The environment variable HOST_ARCH allows to override 'uname' to generate
configuration files for a different architecture than the current one.
where CPU is one of:
$qemu_target_list
EOF
}
qemu_check_access() {
if [ ! -w "$1" ] ; then
echo "ERROR: cannot write to $1" 1>&2
exit 1
fi
}
qemu_check_bintfmt_misc() {
# load the binfmt_misc module
if [ ! -d /proc/sys/fs/binfmt_misc ]; then
if ! /sbin/modprobe binfmt_misc ; then
exit 1
fi
fi
if [ ! -f /proc/sys/fs/binfmt_misc/register ]; then
if ! mount binfmt_misc -t binfmt_misc /proc/sys/fs/binfmt_misc ; then
exit 1
fi
fi
qemu_check_access /proc/sys/fs/binfmt_misc/register
}
installed_dpkg() {
dpkg --status "$1" > /dev/null 2>&1
}
qemu_check_debian() {
if [ ! -e /etc/debian_version ] ; then
echo "WARNING: your system is not a Debian based distro" 1>&2
elif ! installed_dpkg binfmt-support ; then
echo "WARNING: package binfmt-support is needed" 1>&2
fi
qemu_check_access "$EXPORTDIR"
}
qemu_check_systemd() {
if ! systemctl -q is-enabled systemd-binfmt.service ; then
echo "WARNING: systemd-binfmt.service is missing or disabled" 1>&2
fi
qemu_check_access "$EXPORTDIR"
}
qemu_generate_register() {
flags=""
if [ "$CREDENTIAL" = "yes" ] ; then
flags="OC"
fi
if [ "$PERSISTENT" = "yes" ] ; then
flags="${flags}F"
fi
echo ":qemu-$cpu:M::$magic:$mask:$qemu:$flags"
}
qemu_register_interpreter() {
echo "Setting $qemu as binfmt interpreter for $cpu"
qemu_generate_register > /proc/sys/fs/binfmt_misc/register
}
qemu_generate_systemd() {
echo "Setting $qemu as binfmt interpreter for $cpu for systemd-binfmt.service"
qemu_generate_register > "$EXPORTDIR/qemu-$cpu.conf"
}
qemu_generate_debian() {
cat > "$EXPORTDIR/qemu-$cpu" <<EOF
package qemu-$cpu
interpreter $qemu
magic $magic
mask $mask
credential $CREDENTIAL
EOF
}
qemu_set_binfmts() {
# probe cpu type
host_family=$(qemu_get_family)
# register the interpreter for each cpu except for the native one
for cpu in ${qemu_target_list} ; do
magic=$(eval echo \$${cpu}_magic)
mask=$(eval echo \$${cpu}_mask)
family=$(eval echo \$${cpu}_family)
if [ "$magic" = "" ] || [ "$mask" = "" ] || [ "$family" = "" ] ; then
echo "INTERNAL ERROR: unknown cpu $cpu" 1>&2
continue
fi
qemu="$QEMU_PATH/qemu-$cpu"
if [ "$cpu" = "i486" ] ; then
qemu="$QEMU_PATH/qemu-i386"
fi
if [ "$host_family" != "$family" ] ; then
$BINFMT_SET
fi
done
}
CHECK=qemu_check_bintfmt_misc
BINFMT_SET=qemu_register_interpreter
SYSTEMDDIR="/etc/binfmt.d"
DEBIANDIR="/usr/share/binfmts"
QEMU_PATH=/usr/local/bin
CREDENTIAL=no
PERSISTENT=no
options=$(getopt -o ds:Q:e:hc:p: -l debian,systemd:,qemu-path:,exportdir:,help,credential:,persistent: -- "$@")
eval set -- "$options"
while true ; do
case "$1" in
-d|--debian)
CHECK=qemu_check_debian
BINFMT_SET=qemu_generate_debian
EXPORTDIR=${EXPORTDIR:-$DEBIANDIR}
;;
-s|--systemd)
CHECK=qemu_check_systemd
BINFMT_SET=qemu_generate_systemd
EXPORTDIR=${EXPORTDIR:-$SYSTEMDDIR}
shift
# check given cpu is in the supported CPU list
if [ "$1" != "ALL" ] ; then
for cpu in ${qemu_target_list} ; do
if [ "$cpu" = "$1" ] ; then
break
fi
done
if [ "$cpu" = "$1" ] ; then
qemu_target_list="$1"
else
echo "ERROR: unknown CPU \"$1\"" 1>&2
usage
exit 1
fi
fi
;;
-Q|--qemu-path)
shift
QEMU_PATH="$1"
;;
-e|--exportdir)
shift
EXPORTDIR="$1"
;;
-h|--help)
usage
exit 1
;;
-c|--credential)
shift
CREDENTIAL="$1"
;;
-p|--persistent)
shift
PERSISTENT="$1"
;;
*)
break
;;
esac
shift
done
$CHECK
qemu_set_binfmts
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