[PATCH v5 00/13] selftests/sgx: Fix compilation errors

From: Jo Van Bulck
Date: Thu Aug 31 2023 - 09:42:14 EST


Hi,

This is the fifth 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.

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
---------

v5
- Reorder patches (Jarkko, Kai)
- Include fixes tag for inline asm memory clobber patch (Kai)
- Include linker error in static-pie commit message (Kai)
- Include generated assembly in relocations commit (Kai)

v4
- Remove redundant -nostartfiles compiler flag (Jarkko)
- Split dynamic symbol table removal in separate commit (Kai)
- Split redundant push/pop elimination in separate commit (Kai)
- Remove (incomplete) register cleansing on enclave exit
- Fix possibly uninitialized pointer dereferences in load.c

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 (13):
selftests/sgx: Fix uninitialized pointer dereference in error path
selftests/sgx: Fix uninitialized pointer dereferences in
encl_get_entry
selftests/sgx: Include memory clobber for inline asm in test enclave
selftests/sgx: Separate linker options
selftests/sgx: Specify freestanding environment for enclave
compilation
selftests/sgx: Remove redundant enclave base address save/restore
selftests/sgx: Produce static-pie executable for test enclave
selftests/sgx: Handle relocations in test enclave
selftests/sgx: Fix linker script asserts
selftests/sgx: Ensure test enclave buffer is entirely preserved
selftests/sgx: Ensure expected location of test enclave buffer
selftests/sgx: Discard unsupported ELF sections
selftests/sgx: Remove incomplete ABI sanitization code in test enclave

tools/testing/selftests/sgx/Makefile | 12 ++--
tools/testing/selftests/sgx/defines.h | 2 +
tools/testing/selftests/sgx/load.c | 9 ++-
tools/testing/selftests/sgx/sigstruct.c | 5 +-
tools/testing/selftests/sgx/test_encl.c | 67 +++++++++++++------
tools/testing/selftests/sgx/test_encl.lds | 10 +--
.../selftests/sgx/test_encl_bootstrap.S | 28 +++-----
7 files changed, 77 insertions(+), 56 deletions(-)

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2.25.1