linux-kernel - [PATCH v7 00/13] selftests/sgx: Fix compilation errors

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Date:   Thu,  5 Oct 2023 17:38:41 +0200
From:   Jo Van Bulck <jo.vanbulck@...kuleuven.be>
To:     jarkko@...nel.org, kai.huang@...el.com, linux-sgx@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     dave.hansen@...ux.intel.com,
        Jo Van Bulck <jo.vanbulck@...kuleuven.be>
Subject: [PATCH v7 00/13] selftests/sgx: Fix compilation errors

Hi,

This patch series ensures 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.

As far as I see, all commits in this series now have an explicit reviewed-by
tag, so hopefully this can get merged upstream? Please let me know if any
concerns remain and I'd happily address them.

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
---------

v7
  - Add reviewed-by tag (Jarkko)

v6
  - Collect final ack/reviewed-by tags (Jarkko, Kai)

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(-)

-- 
2.25.1