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ERROR_EXTRANEOUS_INFORMATION
What ERROR_EXTRANEOUS_INFORMATION means
The security descriptor was understandable, but included ACL content that could not be represented or consumed exactly in the target context. Treat this as a warning about fidelity, not as permission to discard unknown access-control entries.
Where it appears
- security descriptor conversion or canonicalization
- copying ACLs between file systems or object types
- directory, registry, and management tools that simplify permissions
Likely causes
- object-specific or inherited ACE data unsupported by the destination
- ACL fields beyond what a legacy interface exposes
- conversion between security models with different capabilities
What to collect
- original SDDL and binary security descriptor
- destination object type and file-system format
- ACE order, inheritance flags, object GUIDs, and trustee SIDs
- the exact transformed descriptor actually applied
How to respond
Compare the source and resulting ACL before accepting the operation. Preserve unsupported entries through a richer API where possible. Administrators should confirm effective access, especially when the transformed ACL may be more restrictive than intended.
References
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