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seccomp: Use namespace credentials for FUSE mounts - #3686
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Signed-off-by: Simon Zhou <jp.zdm2008@gmail.com>
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Summary
The FUSE mount helper enters the instance user namespace before applying its final credentials. Passing host-mapped IDs at that point can select the wrong credentials for unprivileged containers.
Pass the namespace UID, GID, FSUID, and FSGID instead. The new unit test uses distinct host-mapped and namespace IDs to verify that the helper arguments use the namespace values.
Testing
go test ./internal/server/seccomp -run '^TestMountArgsFuseCredentials$' -count=1