Daan De Meyer
01e6465b55
When a user namespace dies and its registry entry is torn down, the kernel can recycle its inode number for a freshly-created namespace. A subsequent registration or operation request can therefore find a stale registry entry keyed by the same inode that actually belongs to a different, now-dead user namespace. Use NS_GET_ID to compare the kernel-assigned namespace identifier against the stored one whenever we look up the registry from a live userns fd (AddMount/AddControlGroup/AddNetworkInterface, plus the two registration paths). Extract release_userns_by_info()/release_userns_by_inode() into userns-registry.c so nsresourcework can fully clean up stale entries (BPF allowlist, fdstore fd, cgroups, netifs, on-disk record) before reusing the slot, and remove the now-unused userns_registry_inode_exists(). Co-developed-by: Claude Opus 4.7 <noreply@anthropic.com>
System and Service Manager
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