SpotPass content for each application is stored under the extdata specified by [[BOSS:SetStorageInfo]]. That command and others verify that the PID associated with the current service session has access to the specified extdata by using [[FS:CheckAuthorityToAccessExtSaveData]], returning an error on failure. This basically renders SpotPass unusable under user-processes(when initialized under those processes) which don't have access to any SD extdata(unless NAND extdata is used instead).
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SpotPass content for each application is stored under the extdata specified by [[BOSS:SetStorageInfo]]. Certain commands verify that the PID associated with the current service session has access to the specified extdata by using [[FS:CheckAuthorityToAccessExtSaveData]], returning an error on failure. This basically renders SpotPass unusable under user-processes(when initialized under those processes) which don't have access to any SD extdata(unless NAND extdata is used instead).
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All of these commands using [[FS:CheckAuthorityToAccessExtSaveData]] are: [[BOSS:SetStorageInfo]] and RegisterStorageEntry, for both BOSSU and BOSSP.