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

Jarkko Sakkinen
2020-11-17T19:43:05Z

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@kernel.org>
> > Cc: linux-kselftest@vger.kernel.org
> > Acked-by: Jethro Beekman <jethro@fortanix.com> # v40
> > Signed-off-by: Jarkko Sakkinen <jarkko@kernel.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