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memory safety violationsThe Register
•87% Informative
Arm chip designer Arm introduced a security feature called Memory Tagging Extensions as a defense against memory safety bugs in 2018 .
MTE works by tagging 16-byte blocks of physical memory with four bits of metadata .
Researchers from Seoul National University , Samsung Research , and Georgia Institute of Technology in the US have found that they can break MTE through speculative execution.
Using proof-of-concept code, MTE tags were ferreted out of Google Chrome on Android and Linux kernel using this technique.
The authors have made their code available on GitHub .
The researchers disclosed their findings to Arm, which acknowledged them in December 2023 .
Arm argues that the risk does not undermine the value of MTE, even as it urges the implementation of mechanisms to prevent speculative oracles.
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