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Eric W. Biederman authored
The v3 file capabilities have a uid field that records the filesystem uid of the root user of the user namespace the file capabilities are valid in. When someone is silly enough to have the same underlying uid as the root uid of multiple nested containers a v3 filesystem capability can be ambiguous. In the spirit of don't do that then, forbid writing a v3 filesystem capability if it is ambiguous. Fixes: 8db6c34f ("Introduce v3 namespaced file capabilities") Reviewed-by:
Andrew G. Morgan <morgan@kernel.org> Reviewed-by:
Serge Hallyn <serge@hallyn.com> Signed-off-by:
Eric W. Biederman <ebiederm@xmission.com>
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