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Building Falco
The instructions provided below specify the steps to build Falco version 0.37.1 on Linux on IBM Z for following distributions:
- RHEL (8.8, 8.9, 9.2, 9.3)
- SLES (12 SP5, 15 SP5)
- Ubuntu (20.04, 22.04, 23.10)
Falco supports all three kernel drivers starting with 0.34.x releases on s390x: Kernel module, eBPF probe and Modern eBPF probe. Please check driver - kernel version support matrix for detailed information.
General Notes:
- When following the steps below please use standard permission user unless otherwise specified.
- A directory
/<source_root>/
will be referred to in these instructions, this is a temporary writable directory anywhere you'd like to place it.
If you want to build Falco using manual steps, go to step 2.
Use the following commands to build Falco using the build script. Please make sure you have wget installed.
wget https://raw.githubusercontent.com/linux-on-ibm-z/scripts/master/Falco/0.37.1/build_falco.sh
# Run bash build_falco.sh -h to see all available options
bash build_falco.sh
In case of error, check logs for more details or go to Step 2 to follow manual build steps.
export SOURCE_ROOT=/<source_root>/
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RHEL (8.8, 8.9)
sudo yum install -y gcc gcc-c++ git make cmake autoconf automake pkg-config patch perl libtool elfutils-libelf-devel diffutils which createrepo libarchive wget curl rpm-build kmod kernel-devel-$(uname -r) perl-IPC-Cmd perl-bignum perl-core
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RHEL (9.2, 9.3)
sudo yum install --allowerasing -y gcc gcc-c++ git make cmake autoconf automake pkg-config patch perl libtool elfutils-libelf-devel diffutils which createrepo libarchive wget curl rpm-build kmod kernel-devel-$(uname -r) perl-IPC-Cmd perl-bignum perl-core perl-FindBin go clang llvm bpftool go version
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SLES 12 SP5
SLES_KERNEL_VERSION=$(uname -r | sed 's/-default//') SLES_KERNEL_PKG_VERSION=$(sudo zypper se -s 'kernel-default-devel' | grep ${SLES_KERNEL_VERSION} | head -n 1 | cut -d "|" -f 4 - | tr -d '[:space:]') sudo zypper install -y --force-resolution gcc gcc9 gcc9-c++ git-core patch which automake autoconf libtool libopenssl-devel libcurl-devel libelf-devel "kernel-default-devel=${SLES_KERNEL_PKG_VERSION}" tar curl make sudo ln -sf /usr/bin/gcc /usr/bin/s390x-linux-gnu-gcc sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 50 sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-4.8 20 sudo update-alternatives --skip-auto --config gcc sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-9 50 export CC=$(which gcc) export CXX=$(which g++)
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SLES 15 SP5
SLES_KERNEL_VERSION=$(uname -r | sed 's/-default//') SLES_KERNEL_PKG_VERSION=$(sudo zypper se -s 'kernel-default-devel' | grep ${SLES_KERNEL_VERSION} | head -n 1 | cut -d "|" -f 4 - | tr -d '[:space:]') sudo zypper install -y gcc gcc-c++ gcc12-c++ git-core cmake patch which automake autoconf libtool libelf-devel gawk tar curl vim wget pkg-config glibc-devel-static go1.21 "kernel-default-devel=${SLES_KERNEL_PKG_VERSION}" kmod clang14 llvm14 bpftool sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-12 50 export CC=$(which gcc) export CXX=$(which g++)
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Ubuntu 20.04
sudo apt-get update sudo apt-get install -y git cmake build-essential pkg-config autoconf wget curl patch libtool libelf-dev gcc rpm linux-headers-$(uname -r) kmod
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Ubuntu 22.04
For Ubuntu 22.04, if the current kernel version is
5.15.0-71-generic
, please upgrade it to a higher version such as5.15.0-73-generic
first, sincelinux-tools-5.15.0-71-generic
package doesn't exist in the repository.sudo apt-get update sudo apt-get install -y git cmake build-essential pkg-config autoconf wget curl patch libtool libelf-dev gcc rpm linux-headers-$(uname -r) linux-tools-$(uname -r) kmod clang llvm
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Ubuntu 23.10
sudo apt-get update sudo apt-get install -y git cmake build-essential pkg-config autoconf wget curl patch libtool libelf-dev gcc gcc-12 g++-12 rpm linux-headers-$(uname -r) linux-tools-$(uname -r) kmod clang llvm sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-12 100 --slave /usr/bin/g++ g++ /usr/bin/g++-12 export CC=$(which gcc) export CXX=$(which g++)
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Install Go v1.18.8 (Only for RHEL 8.x, SLES 12 SP5 and Ubuntu)
cd $SOURCE_ROOT wget -q https://raw.githubusercontent.com/linux-on-ibm-z/scripts/master/Go/1.18.4/build_go.sh sed -i 's:"ubuntu-23.04":"ubuntu-23.04" | "ubuntu-23.10":g' build_go.sh #(Only for Ubuntu 23.10) bash build_go.sh -y -v 1.18.8 export GOPATH=$SOURCE_ROOT export PATH=$GOPATH/bin:$PATH export CC=$(which gcc) export CXX=$(which g++) go version
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Install CMake v3.22.5 (Only for SLES 12 SP5)
cd $SOURCE_ROOT wget https://github.com/Kitware/CMake/releases/download/v3.22.5/cmake-3.22.5.tar.gz tar -xf cmake-3.22.5.tar.gz cd cmake-3.22.5 ./bootstrap -- -DCMAKE_BUILD_TYPE:STRING=Release # In case of error: "/lib64/libstdc++.so.6: version `GLIBCXX_3.4.26` not found" do following `ln` sudo ln -sf /usr/local/lib64/libstdc++.so.6.0.28 /lib64/libstdc++.so.6 make sudo make install sudo ln -sf /usr/local/bin/cmake /usr/bin/cmake
cd $SOURCE_ROOT
git clone https://github.com/falcosecurity/falco.git
cd falco
git checkout 0.37.1
curl -sSL https://raw.githubusercontent.com/linux-on-ibm-z/scripts/master/Falco/0.37.1/patch/modern_bpf_clang_flags.patch | git apply -
mkdir -p $SOURCE_ROOT/falco/build
cd $SOURCE_ROOT/falco/build
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Configure Falco
CMAKE_TEST_FLAG="-DBUILD_FALCO_UNIT_TESTS=On" # Only when unit tests are expected to be run after building Falco CMAKE_TEST_FLAG="" # Only when unit tests are not needed CMAKE_FLAGS="-DFALCO_ETC_DIR=/etc/falco -DUSE_BUNDLED_DEPS=On -DCMAKE_BUILD_TYPE=Release -DBUILD_DRIVER=On ${CMAKE_TEST_FLAG}" # Only for RHEL 8.x, SLES 12 SP5 and Ubuntu 20.04 CMAKE_FLAGS="-DFALCO_ETC_DIR=/etc/falco -DUSE_BUNDLED_DEPS=On -DCMAKE_BUILD_TYPE=Release -DBUILD_DRIVER=On -DBUILD_BPF=On -DBUILD_FALCO_MODERN_BPF=ON ${CMAKE_TEST_FLAG}" # Only for RHEL 9.x, SLES 15 SP5 and Ubuntu (22.04, 23.10) cmake $CMAKE_FLAGS ../
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Fix the library link order for libabsl (Only on RHEL 9.3)
cd $SOURCE_ROOT/falco/build/falcosecurity-libs-repo/falcosecurity-libs-prefix/src/falcosecurity-libs/cmake/modules sed -i '135{h;d};136G' grpc.cmake
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Build and Install
cd $SOURCE_ROOT/falco/build # Fix c-ares download link sed -i 's,c-ares.haxx.se/download/,github.com/c-ares/c-ares/releases/download/cares-1_19_1/,g' ./falcosecurity-libs-repo/falcosecurity-libs-prefix/src/falcosecurity-libs/cmake/modules/cares.cmake sed -i 's,c-ares.haxx.se/download/,github.com/c-ares/c-ares/releases/download/cares-1_19_1/,g' ./c-ares-prefix/src/c-ares-stamp/c-ares-urlinfo.txt sed -i 's,c-ares.haxx.se/download/,github.com/c-ares/c-ares/releases/download/cares-1_19_1/,g' ./c-ares-prefix/src/c-ares-stamp/download-c-ares.cmake make -j$(nproc) make package # build deb/rpm packages (optional and only on Ubuntu and RHEL) sudo make install
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Unload any existing module using
sudo rmmod falco
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Insert locally built version
cd $SOURCE_ROOT/falco/build sudo insmod driver/falco.ko
3.6) Copy eBPF driver object file to the default location (Only on RHEL 9.x, SLES 15 SP5 and Ubuntu (22.04, 23.10))
sudo mkdir /root/.falco
sudo cp -f $SOURCE_ROOT/falco/build/driver/bpf/probe.o /root/.falco/falco-bpf.o
cd $SOURCE_ROOT/falco/build
sudo ./unit_tests/falco_unit_tests
A separate falco project https://github.com/falcosecurity/event-generator can be used to run further tests.
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Run Falco with Kernel module (default driver)
sudo falco
Note: Run
sudo falco --help
to see available options to run falco. By default, falco logs events to standard error.Output similar to following will be seen
Tue Nov 28 07:26:50 2023: Falco version: 0.37.1 (s390x) Tue Nov 28 07:26:50 2023: Falco initialized with configuration file: /etc/falco/falco.yaml Tue Nov 28 07:26:50 2023: Loading rules from file /etc/falco/falco_rules.yaml Tue Nov 28 07:26:50 2023: Loading rules from file /etc/falco/falco_rules.local.yaml Tue Nov 28 07:26:50 2023: The chosen syscall buffer dimension is: 8388608 bytes (8 MBs) Tue Nov 28 07:26:50 2023: Starting health webserver with threadiness 4, listening on 0.0.0.0:8765 Tue Nov 28 07:26:50 2023: Loaded event sources: syscall Tue Nov 28 07:26:50 2023: Enabled event sources: syscall Tue Nov 28 07:26:50 2023: Opening 'syscall' source with Kernel module
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Run Falco with eBPF probe driver (Only on RHEL 9.x, SLES 15 SP5 and Ubuntu (22.04, 23.10))
sudo FALCO_BPF_PROBE="" falco
Output similar to following will be seen
Tue Nov 28 07:27:09 2023: Falco version: 0.37.1 (s390x) Tue Nov 28 07:27:09 2023: Falco initialized with configuration file: /etc/falco/falco.yaml Tue Nov 28 07:27:09 2023: DEPRECATION NOTICE: the 'FALCO_BPF_PROBE' environment variable is deprecated and will be removed in Falco 0.38! Tue Nov 28 07:27:09 2023: Loading rules from file /etc/falco/falco_rules.yaml Tue Nov 28 07:27:09 2023: Loading rules from file /etc/falco/falco_rules.local.yaml Tue Nov 28 07:27:09 2023: The chosen syscall buffer dimension is: 8388608 bytes (8 MBs) Tue Nov 28 07:27:09 2023: Starting health webserver with threadiness 4, listening on 0.0.0.0:8765 Tue Nov 28 07:27:09 2023: Loaded event sources: syscall Tue Nov 28 07:27:09 2023: Enabled event sources: syscall Tue Nov 28 07:27:09 2023: Opening 'syscall' source with BPF probe. BPF probe path: /root/.falco/falco-bpf.o
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Run Falco with modern eBPF probe driver (Only on RHEL 9.x, SLES 15 SP5 and Ubuntu (22.04, 23.10))
sudo falco --modern-bpf
Output similar to following will be seen
Tue Nov 28 07:27:22 2023: Falco version: 0.37.1 (s390x) Tue Nov 28 07:27:22 2023: Falco initialized with configuration file: /etc/falco/falco.yaml Tue Nov 28 07:27:22 2023: DEPRECATION NOTICE: the '--modern-bpf' command line option is deprecated and will be removed in Falco 0.38! Tue Nov 28 07:27:22 2023: Loading rules from file /etc/falco/falco_rules.yaml Tue Nov 28 07:27:22 2023: Loading rules from file /etc/falco/falco_rules.local.yaml Tue Nov 28 07:27:22 2023: The chosen syscall buffer dimension is: 8388608 bytes (8 MBs) Tue Nov 28 07:27:22 2023: Starting health webserver with threadiness 4, listening on 0.0.0.0:8765 Tue Nov 28 07:27:22 2023: Loaded event sources: syscall Tue Nov 28 07:27:22 2023: Enabled event sources: syscall Tue Nov 28 07:27:22 2023: Opening 'syscall' source with modern BPF probe. Tue Nov 28 07:27:22 2023: One ring buffer every '2' CPUs.
- https://falco.org/docs/ - Official Falco documentation
The information provided in this article is accurate at the time of writing, but on-going development in the open-source projects involved may make the information incorrect or obsolete. Please open issue or contact us on IBM Z Community if you have any questions or feedback.