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Xen TLB Flush Bypass

Posted by deepcore on July 12, 2022 – 4:26 pm

Xen’s _get_page_type() contains an ABAC cmpxchg() race, where the code incorrectly assumes that if it reads a specific type_info value, and then later cmpxchg() succeeds, the type_info can’t have changed in between.


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