[CHERRY-PICK] SecurityPkg: AuthVariableLib: Handle empty signature lists#1785
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kuqin12 merged 1 commit intomicrosoft:release/202511from May 6, 2026
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[CHERRY-PICK] SecurityPkg: AuthVariableLib: Handle empty signature lists#1785kuqin12 merged 1 commit intomicrosoft:release/202511from
kuqin12 merged 1 commit intomicrosoft:release/202511from
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apop5
approved these changes
May 6, 2026
Flickdm
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May 6, 2026
The current implementation fails to set authenticated variables when the signature list is empty. This can legitimately occur for dbx when no signatures are revoked after a certificate rotation. Update the logic to explicitly handle empty signature lists, avoiding an implicit dependency on the variable being absent from variable storage. Signed-off-by: Kun Qin <kun.qin@microsoft.com> (cherry picked from commit b980aa07196a5534581b16563cd78cfc67a74074)
apop5
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May 6, 2026
makubacki
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May 6, 2026
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Description
The current implementation fails to set authenticated variables when the signature list is empty. This can legitimately occur for dbx when no signatures are revoked after a certificate rotation.
Update the logic to explicitly handle empty signature lists, avoiding an implicit dependency on the variable being absent from variable storage.
(cherry picked from commit b980aa07196a5534581b16563cd78cfc67a74074)
How This Was Tested
This was tested on physical ARM64 platforms and booted to OS desktop and can set empty siglist variable from powershell.
Integration Instructions
N/A