gVisor engine crashes with non-hex container IDs

[LucaGuerra]

Describe the bug

This issue comes from the analysis in: falcosecurity/falco#2897 . Currently, the gVisor engine crashes if a non-hex container ID is used.

How to reproduce it

Example:

# create a container bundle
mkdir redis
mkdir redis/rootfs
docker pull redis
docker create --name tempredis redis
docker export tempredis | tar -C redis/rootfs -xf -
docker rm tempredis
cd ./redis/
runc spec
cd ..
# run a runsc sandbox with a non-hex id
sudo runsc -platform=systrap -file-access=shared -host-uds=open -overlay2=none -directfs -dcache=0 --cpu-num-from-quota --pod-init-config=/etc/docker/runsc_falco_config.json -debug-log=/tmp/runsc/ -debug -strace run -bundle redis/ my_container_id

Meanwhile, run Falco (or any libs client) with gVisor integration enabled.

Expected behaviour

Falco should not crash.

Screenshots

Environment

libs 0.14.0

Additional context

[LucaGuerra]

/assign