d477b21b26
before returning failure if there is partial failure fix detection of partial failure - GNTTABOP_map_grant_ref can actually return zero for partial failure, so we need to always check all the entries to detect it previously, DIAGNOSTIC kernel triggered panic() for partial failure, and non-DIAGNOSTIC kernel did not detect it at all, leading to Dom0 page fault later; since the mapping failure can be triggered by malicious DomU via bad grant reference, it's important to expect the calls to fail, and handle it gracefully without crashing Dom0 part of fixes for XSA-362 |
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