mirror of
https://github.com/falcosecurity/falco.git
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update(scripts): look for a prebuilt Falco module before trying to compile it on-the-fly
Signed-off-by: Leonardo Di Donato <leodidonato@gmail.com>
This commit is contained in:
Leonardo Di Donato
poiana
parent
4b0333cc08
commit
2a7b32e279
@ -1,6 +1,6 @@
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#!/usr/bin/env bash
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#
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# Copyright (C) 2019 The Falco Authors.
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# Copyright (C) 2021 The Falco Authors.
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#
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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@ -82,7 +82,7 @@ get_kernel_config() {
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echo "* Found kernel config at ${HOST_ROOT}/usr/lib/ostree-boot/config-${KERNEL_RELEASE}"
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KERNEL_CONFIG_PATH="${HOST_ROOT}/usr/lib/ostree-boot/config-${KERNEL_RELEASE}"
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elif [ -f "/lib/modules/${KERNEL_RELEASE}/config" ]; then
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# this code works both for native host and agent container assuming that
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# This code works both for native host and containers assuming that
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# Dockerfile sets up the desired symlink /lib/modules -> $HOST_ROOT/lib/modules
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echo "* Found kernel config at /lib/modules/${KERNEL_RELEASE}/config"
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KERNEL_CONFIG_PATH="/lib/modules/${KERNEL_RELEASE}/config"
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@ -140,18 +140,18 @@ get_target_id() {
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}
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load_kernel_module_compile() {
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# skip dkms on UEK hosts because it will always fail
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# Skip dkms on UEK hosts because it will always fail
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if [[ $(uname -r) == *uek* ]]; then
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echo "* Skipping dkms install for UEK host"
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>&2 echo "Skipping because the dkms install always fail (on UEK hosts)"
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return
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fi
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if ! hash dkms &>/dev/null; then
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echo "* Skipping dkms install (dkms not found)"
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if ! hash dkms >/dev/null 2>&1; then
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>&2 echo "This program requires dkms"
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return
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fi
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# try to compile using all the available gcc versions
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# Try to compile using all the available gcc versions
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for CURRENT_GCC in $(which gcc) $(ls "$(dirname "$(which gcc)")"/gcc-* | grep 'gcc-[0-9]\+' | sort -r); do
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echo "* Trying to dkms install ${DRIVER_NAME} module with GCC ${CURRENT_GCC}"
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echo "#!/usr/bin/env bash" > /tmp/falco-dkms-make
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@ -181,7 +181,6 @@ load_kernel_module_compile() {
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}
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load_kernel_module_download() {
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get_target_id
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local FALCO_KERNEL_MODULE_FILENAME="${DRIVER_NAME}_${TARGET_ID}_${KERNEL_RELEASE}_${KERNEL_VERSION}.ko"
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@ -189,14 +188,14 @@ load_kernel_module_download() {
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local URL
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URL=$(echo "${DRIVERS_REPO}/${DRIVER_VERSION}/${FALCO_KERNEL_MODULE_FILENAME}" | sed s/+/%2B/g)
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echo "* Trying to download prebuilt module from ${URL}"
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echo "* Trying to download prebuilt ${DRIVER_NAME} module from ${URL}"
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if curl -L --create-dirs "${FALCO_DRIVER_CURL_OPTIONS}" -o "${HOME}/.falco/${FALCO_KERNEL_MODULE_FILENAME}" "${URL}"; then
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echo "* Download succeeded"
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insmod "${HOME}/.falco/${FALCO_KERNEL_MODULE_FILENAME}" && echo "* Success: ${DRIVER_NAME} module loaded"
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exit $?
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else
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>&2 echo "Download failed, consider compiling your own ${DRIVER_NAME} module and loading it or getting in touch with the Falco community"
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exit 1
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>&2 echo "Unable to find a prebuilt ${DRIVER_NAME} module"
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return
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fi
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}
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@ -237,26 +236,20 @@ load_kernel_module() {
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exit 0
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fi
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if [ -n "$ENABLE_COMPILE" ]; then
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load_kernel_module_compile
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fi
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echo "* Trying to load a system ${DRIVER_NAME} driver, if present"
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if modprobe "${DRIVER_NAME}" > /dev/null 2>&1; then
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echo "* Success: ${DRIVER_NAME} module found and loaded with modprobe"
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exit 0
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fi
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echo "* Trying to find locally a prebuilt ${DRIVER_NAME} module for kernel ${KERNEL_RELEASE}, if present"
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echo "* Looking for a prebuilt ${DRIVER_NAME} module for kernel ${KERNEL_RELEASE} locally"
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get_target_id
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local FALCO_KERNEL_MODULE_FILENAME="${DRIVER_NAME}_${TARGET_ID}_${KERNEL_RELEASE}_${KERNEL_VERSION}.ko"
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if [ -f "${HOME}/.falco/${FALCO_KERNEL_MODULE_FILENAME}" ]; then
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echo "* Found a prebuilt module at ${HOME}/.falco/${FALCO_KERNEL_MODULE_FILENAME}, loading it"
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echo "* Found a prebuilt ${DRIVER_NAME} module at ${HOME}/.falco/${FALCO_KERNEL_MODULE_FILENAME}, loading it"
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insmod "${HOME}/.falco/${FALCO_KERNEL_MODULE_FILENAME}" && echo "* Success: ${DRIVER_NAME} module loaded"
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exit $?
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fi
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@ -264,6 +257,14 @@ load_kernel_module() {
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if [ -n "$ENABLE_DOWNLOAD" ]; then
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load_kernel_module_download
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fi
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if [ -n "$ENABLE_COMPILE" ]; then
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load_kernel_module_compile
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fi
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# Not able to download a prebuilt module nor to compile one on-the-fly
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>&2 echo "Consider compiling your own ${DRIVER_NAME} module and loading it or getting in touch with the Falco community"
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exit 1
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}
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clean_kernel_module() {
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@ -288,7 +289,7 @@ clean_kernel_module() {
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echo "* No ${DRIVER_NAME} module loaded"
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fi
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if ! hash dkms &>/dev/null; then
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if ! hash dkms >/dev/null 2>&1; then
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echo "* Skipping dkms remove (dkms not found)"
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return
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fi
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@ -432,7 +433,6 @@ load_bpf_probe_download() {
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}
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load_bpf_probe() {
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echo "* Mounting debugfs"
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if [ ! -d /sys/kernel/debug/tracing ]; then
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@ -556,7 +556,7 @@ while test $# -gt 0; do
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case "$1" in
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module|bpf)
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if [ -n "$has_args" ]; then
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>&2 echo "Only one driver can be passed"
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>&2 echo "Only one driver per invocation"
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print_usage
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exit 1
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else
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@ -614,7 +614,7 @@ if [ -z "$source_only" ]; then
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fi
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if [ -n "$clean" ]; then
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if ! [ -z "$has_opt"]; then
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if [ -n "$has_opts" ]; then
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>&2 echo "Cannot use --clean with other options"
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exit 1
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fi
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