linux-kernel - [PATCH 0/2] riscv: Add remaining module relocations and tests

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Message-Id: <20230913-module_relocations-v1-0-bb3d8467e793@rivosinc.com>
Date:   Wed, 13 Sep 2023 14:04:48 -0700
From:   Charlie Jenkins <charlie@...osinc.com>
To:     linux-riscv@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Charlie Jenkins <charlie@...osinc.com>
Subject: [PATCH 0/2] riscv: Add remaining module relocations and tests

A handful of module relocations were missing, this patch includes the
remaining ones. I also wrote some test cases to ensure that module
loading works properly. Some relocations cannot be supported in the
kernel, these include the ones that rely on thread local storage and
dynamic linking. The ULEB128 relocations also seem to be stripped out
of kernel module binaries.

This can be tested by enabling KUNIT, RUNTIME_KERNEL_TESTING_MENU, and
RISCV_MODULE_LINKING_KUNIT.

Signed-off-by: Charlie Jenkins <charlie@...osinc.com>
---
Charlie Jenkins (2):
      riscv: Add remaining module relocations
      riscv: Add tests for riscv module loading

 arch/riscv/Kconfig.debug                           |   1 +
 arch/riscv/include/uapi/asm/elf.h                  |   6 +-
 arch/riscv/kernel/Makefile                         |   1 +
 arch/riscv/kernel/module.c                         | 191 ++++++++++++++++++---
 arch/riscv/kernel/tests/Kconfig.debug              |  32 ++++
 arch/riscv/kernel/tests/Makefile                   |   1 +
 arch/riscv/kernel/tests/module_test/Makefile       |  11 ++
 .../tests/module_test/test_module_linking_main.c   |  64 +++++++
 arch/riscv/kernel/tests/module_test/test_set16.S   |  23 +++
 arch/riscv/kernel/tests/module_test/test_set32.S   |  20 +++
 arch/riscv/kernel/tests/module_test/test_set6.S    |  23 +++
 arch/riscv/kernel/tests/module_test/test_set8.S    |  23 +++
 arch/riscv/kernel/tests/module_test/test_sub16.S   |  22 +++
 arch/riscv/kernel/tests/module_test/test_sub32.S   |  22 +++
 arch/riscv/kernel/tests/module_test/test_sub6.S    |  22 +++
 arch/riscv/kernel/tests/module_test/test_sub64.S   |  27 +++
 arch/riscv/kernel/tests/module_test/test_sub8.S    |  22 +++
 17 files changed, 485 insertions(+), 26 deletions(-)
---
base-commit: a48fa7efaf1161c1c898931fe4c7f0070964233a
change-id: 20230908-module_relocations-f63ced651bd7
-- 
- Charlie