linux-kernel - Re: [PATCH v32 00/21] Intel SGX foundations

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Message-ID: <20200610205903.GF18790@linux.intel.com>
Date:   Wed, 10 Jun 2020 13:59:03 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        linux-sgx@...r.kernel.org, akpm@...ux-foundation.org,
        andriy.shevchenko@...ux.intel.com, asapek@...gle.com, bp@...en8.de,
        cedric.xing@...el.com, chenalexchen@...gle.com,
        conradparker@...gle.com, cyhanish@...gle.com,
        dave.hansen@...el.com, haitao.huang@...el.com,
        josh@...htriplett.org, kai.huang@...el.com, kai.svahn@...el.com,
        kmoy@...gle.com, ludloff@...gle.com, luto@...nel.org,
        nhorman@...hat.com, npmccallum@...hat.com, puiterwijk@...hat.com,
        rientjes@...gle.com, tglx@...utronix.de, yaozhangx@...gle.com
Subject: Re: [PATCH v32 00/21] Intel SGX foundations

On Mon, Jun 01, 2020 at 10:51:57AM +0300, Jarkko Sakkinen wrote:
> v29:
> * The selftest has been moved to selftests/sgx. Because SGX is an execution
>   environment of its own, it really isn't a great fit with more "standard"
>   x86 tests.
> 
>   The RSA key is now generated on fly and the whole signing process has
>   been made as part of the enclave loader instead of signing the enclave
>   during the compilation time.
> 
>   Finally, the enclave loader loads now the test enclave directly from its
>   ELF file, which means that ELF file does not need to be coverted as raw
>   binary during the build process.

Something in the above rework broke the selftest.  I'm getting intermittent
EINIT failures with SGX_INVALID_SIGNATURE.  I'm guessing it's related to
the dynamic RSA key generation, e.g. only ~15% of runs fail.  Verified that
v29 selftest fails and v28 passes.  My internal tests also pass, i.e. it's
all but guaranteed to be a selftest issue, not a kernel issue.

Jarkko, I don't have bandwidth to dig into this right now, hopefully this
reproduces in your environment.  Let me know if that's not the case.