Explain NNP transitions #53
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Provide a brief explanation of the NNP concept and how it realtes to SELinux transitions to help guide people deciding whether to allow the nnp_transtion permission or not. Signed-off-by: Ondrej Mosnacek <[email protected]>
stephensmalley
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Sep 10, 2025
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LGTM. Most common use case is allowing daemons to still transition to their own domains when executed with NNP set or from a nosuid mount. SELinux domain transitions are rarely if ever exact subsets of the calling domain's permissions since they at least differ wrt their permissions to their own executable, tmp, and other derived types.
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Provide a brief explanation of the NNP concept and how it realtes to SELinux transitions to help guide people deciding whether to allow the nnp_transtion permission or not.
It has been pointed out to me that the semantics behind the
nnp_transitionpermission are not obvious and that it would help to have some documentation on it, so I tried to to add it here. I'm not quite sure if it's sufficiently clear and correct, so would welcome feedback.Cc @zpytela @stephensmalley