# Building¶

Todo

This page really belongs to devel/, move it there after a proper release. Instead, for all users, there should be documentation for installing without full compilation.

Graphene consists of several components:

• The Library OS itself (a shared library named libsysdb.so, called the “shim” in our source code)
• The Platform Adaptation Layer, or PAL (a shared library named libpal.so)
• A patched GNU C Library (a set of shared libraries libc.so, libpthread.so, libm.so, etc.)

The build of Graphene implies building at least the first two components. The build of the patched C library is optional but highly recommended for performance reasons. The patched C library is built by default.

Graphene currently only works on the x86_64 architecture. Graphene is currently tested on Ubuntu 18.04/20.04, along with Linux kernel version 5.x. We recommend building and installing Graphene on Ubuntu with Linux kernel version 5.11 or higher. If you find problems with Graphene on other Linux distributions, please contact us with a detailed bug report.

## Installing dependencies¶

### Common dependencies¶

Run the following command on Ubuntu to install dependencies:

sudo apt-get install -y autoconf bison build-essential gawk meson \
python3 python3-click python3-jinja2 wget


For GDB support and to run all tests locally you also need to install:

sudo apt-get install -y libunwind8 python3-pyelftools python3-pytest


### Dependencies for SGX¶

The build of Graphene with SGX support requires the corresponding SGX software infrastructure to be installed on the system. In particular, the FSGSBASE functionality must be enabled in the Linux kernel, the Intel SGX driver must be running, and Intel SGX SDK/PSW/DCAP must be installed.

Note

We recommend to use Linux kernel version 5.11 or higher: starting from this version, Linux has the FSGSBASE functionality as well as the Intel SGX driver built-in. If you have Linux 5.11+, skip steps 2 and 3.

#### 1. Required packages¶

Run the following commands on Ubuntu to install SGX-related dependencies:

sudo apt-get install -y libcurl4-openssl-dev libprotobuf-c-dev \
protobuf-c-compiler python3-pip python3-protobuf
python3 -m pip install toml>=0.10


#### 2. Upgrade to the Linux kernel patched with FSGSBASE¶

FSGSBASE is a feature in recent processors which allows direct access to the FS and GS segment base addresses. For more information about FSGSBASE and its benefits, see this discussion. Note that if your kernel version is 5.9 or higher, then the FSGSBASE feature is already supported and you can skip this step.

If your current kernel version is lower than 5.9, then you have two options:

#### 3. Install the Intel SGX driver¶

This step depends on your hardware and kernel version. Note that if your kernel version is 5.11 or higher, then the Intel SGX driver is already installed and you can skip this step.

If you have an older CPU without FLC support, you need to download and install the the following Intel SGX driver:

Alternatively, if your CPU supports FLC, you can choose to install the DCAP version of the Intel SGX driver from:

#### 5. Generate signing keys¶

A 3072-bit RSA private key (PEM format) is required for signing the manifest. If you don’t have a private key, create it with the following command:

openssl genrsa -3 -out enclave-key.pem 3072


You can either place the generated enclave key in the default path, Pal/src/host/Linux-SGX/signer/enclave-key.pem, or specify the key’s location through the environment variable SGX_SIGNER_KEY.

After signing the application’s manifest, users may ship the application and Graphene binaries, along with an SGX-specific manifest (.manifest.sgx extension), the SIGSTRUCT signature file (.sig extension), and the EINITTOKEN file (.token extension) to execute on another SGX-enabled host.

## Building¶

Note

We’re in the middle of the migration from Make to Meson. In the meantime you need to run both buildchains, first make then meson.

To build Graphene, in the root directory of Graphene repo, run the following commands:

# if you build graphene-direct (note that "direct" means non-SGX version)
make

# if you build graphene-sgx
make SGX=1 ISGX_DRIVER_PATH=<path-to-sgx-driver-sources>


The path to the SGX driver sources must point to the absolute path where the SGX driver was downloaded or installed in the previous step. For example, for the DCAP version 33 of the SGX driver, you must specify ISGX_DRIVER_PATH="/usr/src/sgx-1.33/". You can define ISGX_DRIVER_PATH="" to use the default in-kernel driver’s C header.

Running make SGX=1 sgx-tokens in the test or regression directory will automatically generate the required SIGSTRUCT signatures (.sig files) and EINITTOKENs (.token files).

Then install Graphene (recall that “direct” means non-SGX version):

meson setup build/ --buildtype=release -Ddirect=enabled -Dsgx=enabled
ninja -C build/
sudo ninja -C build/ install


Set -Ddirect= and -Dsgx= options to enabled or disabled according to whether you built the corresponding PAL (the snippet assumes you built both).

Note

When installing from sources, Graphene executables are placed under /usr/local/bin. Some Linux distributions (notably CentOS) do not search for executables under this path. If your system reports that Graphene programs can not be found, you might need to edit your configuration files so that /usr/local/bin is in your path (in PATH environment variable).

• To create a debug build, run make DEBUG=1 and meson --buildtype=debug. This adds debug symbols in all Graphene components, builds them without optimizations, and enables detailed debug logs in Graphene.

Warning

Debug builds are not suitable for production.

• To create a debug build that does not disable optimizations, run make DEBUGOPT=1 and meson --buildtype=debugoptimized.

Warning

Debug builds are not suitable for production.

Note

This is generally not recommended, because optimized builds lose some debugging information, and may cause GDB to display confusing tracebacks or garbage data. You should use DEBUGOPT=1 only if you have a good reason (e.g. for profiling).

• To compile with undefined behavior sanitization (UBSan), run make UBSAN=1 and meson -Dubsan=enabled. This causes Graphene to abort when undefined behavior is detected (and display information about source line). UBSan can be enabled for both debug and non-debug builds.

Warning

UBSan builds (even non-debug) are not suitable for production.

• To build with -Werror, run make WERROR=1 and meson --werror.

• To install into some other place than /usr/local, use meson --prefix=<prefix>. Note that you then need to include the <prefix>/bin directory in $PATH and <prefix>/lib/python<version>/site-packages in $PYTHONPATH.

## Advanced: installing Linux kernel with FSGSBASE patches¶

FSGSBASE patchset was merged in Linux kernel version 5.9. For older kernels it is available as separate patches.

The following instructions to patch and compile a Linux kernel with FSGSBASE support below are written around Ubuntu 18.04 LTS (Bionic Beaver) with a Linux 5.4 LTS stable kernel but can be adapted for other distros as necessary. These instructions ensure that the resulting kernel has FSGSBASE support.

1. Clone the repository with patches:

git clone https://github.com/oscarlab/graphene-sgx-driver

2. Setup a build environment for kernel development following the instructions in the Ubuntu wiki. Clone Linux version 5.4 via:

git clone --single-branch --branch linux-5.4.y \
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
cd linux

3. Apply the provided FSGSBASE patches to the kernel source tree:

git am <graphene-sgx-driver>/fsgsbase_patches/*.patch


The conversation regarding this patchset can be found in the kernel mailing list archives here.

4. Build and install the kernel following the instructions in the Ubuntu wiki.

5. After rebooting, verify the patched kernel is the one that has been booted and is running:

uname -r

6. Also verify that the patched kernel supports FSGSBASE (the below command must return that bit 2 is set):

LD_SHOW_AUXV=1 /bin/true | grep AT_HWCAP2


After the patched Linux kernel is installed, you may proceed with installations of other SGX software infrastructure: the Intel SGX Linux driver, the Intel SGX SDK/PSW, and Graphene itself.