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[PAL/Linux-SGX] Add AEX-Notify support #1530

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[PAL/Linux-SGX] Add AEX-Notify support #1530

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Commits on Apr 29, 2024

  1. [PAL/Linux-SGX] Add AEX-Notify feature enabling code and update doc. 

    AEX-Notify is a security feature used to mitigate the SGX-Step type
attacks on SGX. The SGX-Step type attacks rely on frequent enclave
preemptions (e.g. interrupts) to execute an SGX enclave in small
increments and strategically extract secret data from the enclave
through one or more side channels. The AEX Notify feature allows
a mitigation handler to run after ERESUME from each Async Exit,
aiming to mitigate the side-channel information exposed by the attacks.

This commit includes below changes for aex-notify support:
- add a new manifest option `sgx.enable_aex_notify`
- update related structures for aex-notify feature
- add initialization/finalization code for aex-notify
- update document

Co-authored-by: Gu, Junjun <[email protected]>
Co-authored-by: Dmitrii Kuvaiskii <[email protected]>
Signed-off-by: Gu, Junjun <[email protected]>
Signed-off-by: Dmitrii Kuvaiskii <[email protected]>
Signed-off-by: Zhang, Lili Z <[email protected]>
    @lzha101 @JunjunGu1 @dimakuv
    3 people committed Apr 29, 2024
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  2. [PAL/Linux-SGX] Add AEX-Notify enabling and documentation. 

    AEX-Notify is a security feature used to mitigate the SGX-Step type
attacks on SGX. The SGX-Step type attacks rely on frequent enclave
preemptions (e.g. interrupts) to execute an SGX enclave in small
increments and strategically extract secret data from the enclave
through one or more side channels. The AEX-Notify feature allows
a mitigation handler to run after each asynchronous exit (AEX).

This commit is first in a series that adds the complete AEX-Notify
feature. It includes the following enablement changes:
- add a new manifest option `sgx.experimental_enable_aex_notify`
- update related structures for AEX-Notify feature
- add initialization/finalization code for aex-notify
- update documentation

Signed-off-by: Zhang, Lili Z <[email protected]>
    @lzha101
    lzha101 committed Apr 29, 2024
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  3. fixup! [PAL/Linux-SGX] Add AEX-Notify enabling and documentation. 

    Signed-off-by: Zhang, Lili Z <[email protected]>
    @lzha101
    lzha101 committed Apr 29, 2024
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