linux-kernel - Re: [PATCH v41 20/24] selftests/x86: Add a selftest for SGX

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Date:   Tue, 17 Nov 2020 21:42:17 +0200
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Shuah Khan <skhan@...uxfoundation.org>
Cc:     x86@...nel.org, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
        linux-kselftest@...r.kernel.org,
        Jethro Beekman <jethro@...tanix.com>,
        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,
        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,
        sean.j.christopherson@...el.com, tglx@...utronix.de,
        yaozhangx@...gle.com, mikko.ylinen@...el.com
Subject: Re: [PATCH v41 20/24] selftests/x86: Add a selftest for SGX

On Mon, Nov 16, 2020 at 11:19:12AM -0700, Shuah Khan wrote:
> On 11/12/20 3:01 PM, Jarkko Sakkinen wrote:
> > Add a selftest for SGX. It is a trivial test where a simple enclave copies
> > one 64-bit word of memory between two memory locations, but ensures that
> > all SGX hardware and software infrastructure is functioning.
> > 
> > Cc: Shuah Khan <shuah@...nel.org>
> > Cc: linux-kselftest@...r.kernel.org
> > Acked-by: Jethro Beekman <jethro@...tanix.com> # v40
> > Signed-off-by: Jarkko Sakkinen <jarkko@...nel.org>
> > ---
> > Changes from v40:
> > * Remove $(OUTPUT)/test_encl.elf from TEST_CUSTOM_PROGS, as otherwise
> >    run_tests tries to execute it. Add it as a build dependency.
> > * Use the correct device path, /dev/sgx_enclave, instead of
> >    /dev/sgx/enclave.
> > * Return kselftest framework expected return codes.
> > 
> >   tools/testing/selftests/Makefile              |   1 +
> >   tools/testing/selftests/sgx/.gitignore        |   2 +
> >   tools/testing/selftests/sgx/Makefile          |  53 +++
> >   tools/testing/selftests/sgx/call.S            |  44 ++
> >   tools/testing/selftests/sgx/defines.h         |  21 +
> >   tools/testing/selftests/sgx/load.c            | 277 +++++++++++++
> >   tools/testing/selftests/sgx/main.c            | 246 +++++++++++
> >   tools/testing/selftests/sgx/main.h            |  38 ++
> >   tools/testing/selftests/sgx/sigstruct.c       | 391 ++++++++++++++++++
> >   tools/testing/selftests/sgx/test_encl.c       |  20 +
> >   tools/testing/selftests/sgx/test_encl.lds     |  40 ++
> >   .../selftests/sgx/test_encl_bootstrap.S       |  89 ++++
> >   12 files changed, 1222 insertions(+)
> >   create mode 100644 tools/testing/selftests/sgx/.gitignore
> >   create mode 100644 tools/testing/selftests/sgx/Makefile
> >   create mode 100644 tools/testing/selftests/sgx/call.S
> >   create mode 100644 tools/testing/selftests/sgx/defines.h
> >   create mode 100644 tools/testing/selftests/sgx/load.c
> >   create mode 100644 tools/testing/selftests/sgx/main.c
> >   create mode 100644 tools/testing/selftests/sgx/main.h
> >   create mode 100644 tools/testing/selftests/sgx/sigstruct.c
> >   create mode 100644 tools/testing/selftests/sgx/test_encl.c
> >   create mode 100644 tools/testing/selftests/sgx/test_encl.lds
> >   create mode 100644 tools/testing/selftests/sgx/test_encl_bootstrap.S
> > 
> > diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile
> > index d9c283503159..aa06e3ea0250 100644
> > --- a/tools/testing/selftests/Makefile
> > +++ b/tools/testing/selftests/Makefile
> > @@ -68,6 +68,7 @@ TARGETS += user
> >   TARGETS += vm
> >   TARGETS += x86
> >   TARGETS += zram
> > +TARGETS += sgx
> >   #Please keep the TARGETS list alphabetically sorted
> 
> Please keep the list sorted alphabetically as stated
> in the comment above.
> 
> 
> > +}
> > +
> > +int main(int argc, char *argv[], char *envp[])
> > +{
> > +	struct sgx_enclave_run run;
> > +	struct vdso_symtab symtab;
> > +	Elf64_Sym *eenter_sym;
> > +	uint64_t result = 0;
> > +	struct encl encl;
> > +	unsigned int i;
> > +	void *addr;
> > +	int ret;
> > +
> > +	memset(&run, 0, sizeof(run));
> > +
> > +	if (!encl_load("test_encl.elf", &encl)) {
> > +		encl_delete(&encl);
> > +		ksft_exit_skip("cannot load enclaves\n");
> > +	}
> > +
> > +	if (!encl_measure(&encl))
> > +		goto err;
> > +
> > +	if (!encl_build(&encl))
> > +		goto err;
> > +
> > +	/*
> > +	 * An enclave consumer only must do this.
> > +	 */
> > +	for (i = 0; i < encl.nr_segments; i++) {
> > +		struct encl_segment *seg = &encl.segment_tbl[i];
> > +
> > +		addr = mmap((void *)encl.encl_base + seg->offset, seg->size,
> > +			    seg->prot, MAP_SHARED | MAP_FIXED, encl.fd, 0);
> > +		if (addr == MAP_FAILED) {
> > +			fprintf(stderr, "mmap() failed, errno=%d.\n", errno);
> > +			exit(1);
> 
> This should be KSFT_FAIL.
> 
> thanks,
> -- Shuah

Thanks.

/Jarkko