Fix handling of file capabilities. #11704
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All the following changes are compatible with what Linux does. - Do not attempt to apply file capabilities when it is not present. - If the rootID specified in v3 file capability struct does not own the current userns, then file capabilities are not applied. - While applying file capabilities, EPERM is only returned if VFS_CAP_FLAGS_EFFECTIVE is set. - Re-raise capabilities of root user as per capabilities(7). Compare security/commoncap.c:handle_privileged_root(). PiperOrigin-RevId: 756179837
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Fix handling of file capabilities.
All the following changes are compatible with what Linux does.
current userns, then file capabilities are not applied.
VFS_CAP_FLAGS_EFFECTIVE is set.
security/commoncap.c:handle_privileged_root().