Messages in this thread | | | Subject | Re: [PATCH 12/14] selftests/sgx: Add page permission and exception test | From | Dave Hansen <> | Date | Thu, 16 Sep 2021 08:30:05 -0700 |
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On 9/15/21 1:31 PM, Reinette Chatre wrote: > Add a test to ensure that (1) PTE permissions can be changed as long as > they do not exceed EPCM permissions, and (2) even if EPCM permissions > allow a page to be written to, if the PTE permissions do not then a #PF > should be generated when attempting to write to a (from PTE perspective) > read-only page.
It took me a minute to figure out what this was trying to say. Maybe breaking it down into these three steps would help:
Add a test that: (1) Creates an SGX enclave page with writable EPCM permission (2) Changes the PTE permission on the page to read-only. This should be permitted because the permission does not exceed the EPCM permission. (3) Attempts a write to the page and generate a page fault (#PF) because of the read-only PTE.
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