Mount a minimal /dev in full-filesystem Bubblewrap sandboxes - #37349
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## Why Binding the full host filesystem into a network-isolated Bubblewrap sandbox also inherits the host's device tree. ## What changed - Overlay `/dev` with Bubblewrap's minimal device filesystem while preserving the root bind's `nodev` behavior. - Bind `/dev/shm` back into the sandbox when available so host and sandbox processes can continue to share memory files. ## Testing Add a managed-proxy integration test that verifies standard device nodes remain usable, `/dev` is not the host directory, and `/dev/shm` writes are shared with the host. GitOrigin-RevId: 1d91fe44affd792d2777adae8f2cce6d85d14103
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Mount a minimal
/devin full-filesystem Bubblewrap sandboxesWhy
Binding the full host filesystem into a network-isolated Bubblewrap sandbox also
inherits the host's device tree.
What changed
/devwith Bubblewrap's minimal device filesystem while preservingthe root bind's
nodevbehavior./dev/shmback into the sandbox when available so host and sandboxprocesses can continue to share memory files.
Testing
Add a managed-proxy integration test that verifies standard device nodes remain
usable,
/devis not the host directory, and/dev/shmwrites are shared withthe host.