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Flatcar driver loader support #2043

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merged 2 commits into from
Jun 13, 2022
Merged

Flatcar driver loader support #2043

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c3dbd98
update(docker,falco_scripts): fix kernel module build on Flatcar
jepio Jun 7, 2022
8fe79ee
update(falco_scripts): support pre-built module/probe on Flatcar
jepio Jun 7, 2022
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1 change: 1 addition & 0 deletions docker/falco/Dockerfile
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@ RUN apt-get update \
libssl-dev \
llvm-7 \
netcat \
patchelf \
xz-utils \
&& rm -rf /var/lib/apt/lists/*

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1 change: 1 addition & 0 deletions docker/local/Dockerfile
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Expand Up @@ -40,6 +40,7 @@ RUN apt-get update \
liblsan0 \
libtsan0 \
libcc1-0 \
patchelf \
&& rm -rf /var/lib/apt/lists/*

RUN if [ "$TARGETARCH" = "amd64" ]; \
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36 changes: 36 additions & 0 deletions scripts/falco-driver-loader
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Expand Up @@ -135,12 +135,42 @@ get_target_id() {
TARGET_ID="ubuntu-generic"
fi
;;
("flatcar")
KERNEL_RELEASE="${VERSION_ID}"
TARGET_ID=$(echo "${OS_ID}" | tr '[:upper:]' '[:lower:]')
;;
(*)
TARGET_ID=$(echo "${OS_ID}" | tr '[:upper:]' '[:lower:]')
;;
esac
}

flatcar_relocate_tools() {
local -a tools=(
scripts/basic/fixdep
scripts/mod/modpost
tools/objtool/objtool
)
local -r hostld=$(ls /host/usr/lib64/ld-*.so)
local -r kdir=/lib/modules/$(ls /lib/modules/)/build
echo "** Found host dl interpreter: ${hostld}"
for host_tool in ${tools[@]}; do
t=${host_tool}
tool=$(basename $t)
tool_dir=$(dirname $t)
host_tool=${kdir}/${host_tool}
if [ ! -f ${host_tool} ]; then
continue
fi
umount ${host_tool} 2>/dev/null || true
mkdir -p /tmp/${tool_dir}/
cp -a ${host_tool} /tmp/${tool_dir}/
echo "** Setting host dl interpreter for $host_tool"
patchelf --set-interpreter ${hostld} --set-rpath /host/usr/lib64 /tmp/${tool_dir}/${tool}
mount -o bind /tmp/${tool_dir}/${tool} ${host_tool}
done
}

load_kernel_module_compile() {
# Skip dkms on UEK hosts because it will always fail
if [[ $(uname -r) == *uek* ]]; then
Expand All @@ -153,6 +183,12 @@ load_kernel_module_compile() {
return
fi

if [ "${TARGET_ID}" == "flatcar" ]; then
KERNEL_RELEASE=$(uname -r)
echo "* Flatcar detected (version ${VERSION_ID}); relocating kernel tools"
flatcar_relocate_tools
fi

# Try to compile using all the available gcc versions
for CURRENT_GCC in $(which gcc) $(ls "$(dirname "$(which gcc)")"/gcc-* | grep 'gcc-[0-9]\+' | sort -n -r -k 2 -t -); do
echo "* Trying to dkms install ${DRIVER_NAME} module with GCC ${CURRENT_GCC}"
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