Gamelift InitSDK Error on Amazon Linux 2023

Question

I am getting an invalid attempt to read memory error when starting my unreal engine server on amazon linux 2023. I am using the 5.1 sdk which i have compiled using an amazonlinux 2023 container and placed the .so file within the unreal engine plugin.

```
[2023.08.31-01.29.38:908][  0]GameServerLog: Initializing the GameLift Server
[2023.08.31-01.29.38:908][  0]GameServerLog: PID: 0
[2023.08.31-01.29.38:916][  0]LogCore: === Critical error: ===
Unhandled Exception: SIGSEGV: invalid attempt to read memory at address 0x00007f04eebdce80

[2023.08.31-01.29.38:916][  0]LogCore: Fatal error!

0x00007f04eebdce80 libcrypto.so.3!UnknownFunction(0x3dce80)
```

Answer

Hi Micah,

For C++ SDK without using Unreal, you can just have the .so files with the Server executable. But with Unreal Engine you need to build the C++ SDK using the same version of OpenSSL that was used by Unreal Engine. UE5.1 uses OpenSSL1.1.n, but if you're on a different version you can double-check the version of OpenSSL by looking for the following log line from the UE packaging output window: "LogInit:  - supports SSL with OpenSSL/1.1.1n".

Then, download the same version of OpenSSL from https://www.openssl.org/source/old/1.1.1/

```
$ cd ~/openssl-1.1.1n; ./config; make
$ mkdir lib
$ cp libcrypto.so.1.1 libssl.so.1.1 lib/
$ cd ~/GameLift-Cpp-ServerSDK-5.1.0/; mkdir out
$ export OPENSSL_ROOT_DIR=/home/ec2-user/openssl-1.1.1n/
$ export OPENSSL_LIBRARIES=/home/ec2-user/openssl-1.1.1n/lib/
$ cmake -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=Release -S . -B ./out -DBUILD_FOR_UNREAL=1
$ cd out; make
```

Place the generated `libaws-cpp-sdk-gamelift-server.so` in `\Plugins\GameLiftServerSDK\ThirdParty\GameLiftServerSDK\Linux\x86_64-unknown-linux-gnu`. This is where Unreal links to the C++ SDK from during compilation and packaging. Detailed instructions on setting up the plugin can be found [here](https://docs.aws.amazon.com/gamelift/latest/developerguide/integration-engines-setup-unreal.html).

After packaging the game server for Linux, copy over the .so files for OpenSSL into the package bundle. Your folder structure should finally look like:

```
-
--install.sh
--.sh (This is the target .sh file that is generated by Unreal itself)
--\Plugins\GameLiftServerSDK\ThirdParty\GameLiftServerSDK\Linux\x86_64-unknown-linux-gnu\
   --libaws-cpp-sdk-gamelift-server.so
   --libcrypto.so.1.1
   --libssl.so.1.1
```

Answer

I'm not the original poster but I am having the exact same issue with Linux 2023. I tried copying both libssl(libcrypto).so , libssl(libcrypto).so.3, and tried libssl(libcrypto).so.1.1 in the same folder as libaws-cpp-sdk-gamelift.server.so and I am seeing the same error as the original post too.

Gamelift InitSDK Error on Amazon Linux 2023

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