If I want to reinstall it, I can do so with rpm-ostree install cowsay and it will be added to the new image… but if I do that, I’ll have drift between my OCI image generated by CI/CD and the state of my virtual machine. This isn’t desirable because bootc delivers by default a bootc-fetch-apply-updates.service service that will periodically check if a new image is available and automatically switch to it to keep the system up to date (it’s a systemd timer that runs every 4 hours by default and will launch the bootc upgrade --apply --quiet command).
The Sentry intercepts the untrusted code’s syscalls and handles them in user-space. It reimplements around 200 Linux syscalls in Go, which is enough to run most applications. When the Sentry actually needs to interact with the host to read a file, it makes its own highly restricted set of roughly 70 host syscalls. This is not just a smaller filter on the same surface; it is a completely different surface. The failure mode changes significantly. An attacker must first find a bug in gVisor’s Go implementation of a syscall to compromise the Sentry process, and then find a way to escape from the Sentry to the host using only those limited host syscalls.
，更多细节参见同城约会
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