tools: temporarily unset LD_LIBRARY_PATH when generating ssh key

[Radon10043]

When running tools/create-buildroot-image.sh, the following error occurs:

OpenSSL version mismatch. Built against 30000020, you have 30400010
make: *** [fs/ext2/ext2.mk:65: /vol/linux/bisect/buildroot/output/images/rootfs.ext2] Error 255

The reason is that buildroot set LD_LIBRARY_PATH to include $BUILDROOT/output/host/lib. When the script invokes host's ssh-keygen, the dynamic linker loads the OpenSSL libraries built by buildroot instead of the host, which may resulting in version mismatch.

To fix this issue, temporarily unset LD_LIBRARY_PATH when invoking ssh-keygen.

[a-nogikh]

I've never observed it when I was running the script locally. Could it be that the problem is somehow related to your environment?

[Radon10043]

To avoid environment impacts, I ran a docker container based on ubuntu:22.04 and only installed the dependencies required to build buildroot, but the version mismatch error still occur. Here is the build log (I removed some contents on the beginning of the full log since github only allows files < 25MB to be uploaded).

The commands I ran in the container are as follows:

apt update
apt install -y git wget vim build-essential file cpio unzip rsync bc language-pack-en-base
git clone -b 2025.02.1 --depth 1 https://github.com/buildroot/buildroot
cd buildroot
wget https://github.com/google/syzkaller/raw/refs/heads/master/tools/create-buildroot-image.sh
chmod +x ./create-buildroot-image.sh
FORCE_UNSAFE_CONFIGURE=1 ./create-buildroot-image.sh

[a-nogikh]

Thanks for providing the clean way to reproduce it!
That also caused the same problem on my side.

[Radon10043]

@a-nogikh Sorry for the late reply, I haven't had time to modify the code yet. Could you please dequeue this pr first? :)

[a-nogikh]

Thanks!