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charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2018-11-21 04:25, Jarkko Sakkinen wrote: > On Tue, Nov 20, 2018 at 07:19:37AM -0800, Andy Lutomirski wrote: >> general by mucking with some regs and retrying -- that will infinite >> loop and confuse everyone. I'm not even 100% convinced that decoding >> the insn stream is useful -- AEP can point to something that isn't >> ENCLU. >=20 > In my return-to-AEP approach to whole point was not to do any decoding > but instead have something else always in the AEP handler than just > ENCLU. >=20 > No instruction decoding. No RIP manipulation. >=20 >> IOW the kernel needs to know *when* to apply this special behavior. >> Sadly there is no bit in the exception frame that says "came from >> SGX". Jarkko, can you please explain you solution in detail? The CPU receives=20 an exception. This will be handled by the kernel exception handler. What = information does the kernel exception handler use to determine whether=20 to deliver the exception as a regular signal to the process, or whether=20 to set the special registers values for userspace and just continue=20 executing the process manually? -- Jethro Beekman | Fortanix --------------ms000004040406070609060704 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCC Cx8wggUxMIIEGaADAgECAhBdZC9mIseKJlmxx1xn+g00MA0GCSqGSIb3DQEBCwUAMIGXMQsw CQYDVQQGEwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxm b3JkMRowGAYDVQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBD bGllbnQgQXV0aGVudGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xODA5MTUwMDAw MDBaFw0xOTA5MTUyMzU5NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2pldGhyb0Bmb3J0YW5peC5j 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