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charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 2018-11-18 18:32, Jarkko Sakkinen wrote: > On Sun, Nov 18, 2018 at 09:15:48AM +0200, Jarkko Sakkinen wrote: >> On Thu, Nov 01, 2018 at 10:53:40AM -0700, Andy Lutomirski wrote: >>> Hi all- >>> >>> The people working on SGX enablement are grappling with a somewhat >>> annoying issue: the x86 EENTER instruction is used from user code and= >>> can, as part of its normal-ish operation, raise an exception. It is >>> also highly likely to be used from a library, and signal handling in >>> libraries is unpleasant at best. >>> >>> There's been some discussion of adding a vDSO entry point to wrap >>> EENTER and do something sensible with the exceptions, but I'm >>> wondering if a more general mechanism would be helpful. >> >> I haven't really followed all of this discussion because I've been bus= y >> working on the patch set but for me all of these approaches look awful= ly >> complicated. >> >> I'll throw my own suggestion and apologize if this has been already >> suggested and discarded: return-to-AEP. >> >> My idea is to do just a small extension to SGX AEX handling. At the >> moment hardware will RAX, RBX and RCX with ERESUME parameters. We can >> fill extend this by filling other three spare registers with exception= >> information. >> >> AEP handler can then do whatever it wants to do with this information >> or just do ERESUME. >=20 > A correction here. In practice this will add a requirement to have a bi= t > more complicated AEP code (check the regs for exceptions) than before > and not just bytes for ENCLU. >=20 > e.g. AEP handler should be along the lines >=20 > 1. #PF (or #UD or) happens. Kernel fills the registers when it cannot > handle the exception and returns back to user space i.e. to the > AEP handler. > 2. Check the registers containing exception information. If they have > been filled, take whatever actions user space wants to take. > 3. Otherwise, just ERESUME. >=20 > From my point of view this is making the AEP parameter useful. Its > standard use is just weird (always point to a place just containing > ENCLU bytes, why the heck it even exists). I like this solution. Keeps things simple. One question: when an=20 exception occurs, how does the kernel know whether to set special=20 registers or send a signal? -- Jethro Beekman | Fortanix --------------ms030006070600080800030405 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 b20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDRQDOQsroKjy2xAQCXLyqryJt4 Xwj8hcweJCzOnjILKHIoWlOQ0b9yIbFLIWBRt/9zdxlE5ZabDVHnkIyhcVgtU/BA73e78Wx2 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