[PATCH v3 0/9] selftests/sgx: Fix compilation errors

[Jo Van Bulck]

Hi,

This is the third iteration of a patch series to ensure that all SGX selftests
succeed when compiling with optimizations (as tested with -O{0,1,2,3,s} for
both gcc 11.3.0 and clang 14.0.0). The aim of the patches is to avoid reliance
on undefined, compiler-specific behavior that can make the test results
fragile.

If useful, I can also include an elementary wrapper shell script to compile and
run the tests for different compilers (gcc/clang) and optimization levels.
Reference output below:

.. Testing gcc   -O0    [OK]
.. Testing gcc   -O1    [OK]
.. Testing gcc   -O2    [OK]
.. Testing gcc   -O3    [OK]
.. Testing gcc   -Os    [OK]
.. Testing gcc   -Ofast [OK]
.. Testing gcc   -Og    [OK]
.. Testing clang -O0    [OK]
.. Testing clang -O1    [OK]
.. Testing clang -O2    [OK]
.. Testing clang -O3    [OK]
.. Testing clang -Os    [OK]
.. Testing clang -Ofast [OK]
.. Testing clang -Og    [OK]

Changelog
---------

v3
  - Refactor encl_op_array declaration and indexing (Jarkko)
  - Annotate encl_buffer with "used" attribute (Kai)
  - Split encl_buffer size and placement commits (Kai)

v2
  - Add additional check for NULL pointer (Kai)
  - Refine to produce proper static-pie executable
  - Fix linker script assertions
  - Specify memory clobber for inline asm instead of volatile (Kai)
  - Clarify why encl_buffer non-static (Jarkko, Kai)
  - Clarify -ffreestanding (Jarkko)

Best,
Jo

Jo Van Bulck (9):
  selftests/sgx: Fix uninitialized pointer dereference in error path
  selftests/sgx: Produce static-pie executable for test enclave
  selftests/sgx: Handle relocations in test enclave
  selftests/sgx: Fix linker script asserts
  selftests/sgx: Include memory clobber for inline asm in test enclave
  selftests/sgx: Ensure test enclave buffer is entirely preserved
  selftests/sgx: Ensure expected location of test enclave buffer
  selftests/sgx: Separate linker options
  selftests/sgx: Specify freestanding environment for enclave
    compilation

 tools/testing/selftests/sgx/Makefile          | 14 ++--
 tools/testing/selftests/sgx/defines.h         |  2 +
 tools/testing/selftests/sgx/sigstruct.c       |  5 +-
 tools/testing/selftests/sgx/test_encl.c       | 66 ++++++++++++-------
 tools/testing/selftests/sgx/test_encl.lds     | 10 +--
 .../selftests/sgx/test_encl_bootstrap.S       | 12 ++--
 6 files changed, 68 insertions(+), 41 deletions(-)

-- 
2.25.1