Project Scope

Enable/optimize AddressSanitizer function on RISC-V architecture. The major work is to port AddressSanitizer to RISC-V architecture both in GCC and LLVM, both for RV32 and RV64, both from pure software and hardware-software co-design.

Components and Repos

The tool consists of a compiler instrumentation module which works as an LLVM pass and a run-time library which replaces the malloc function.

• For LLVM:

The instrumentation module is maintained in LLVM backend. (llvm/lib/Transforms/Instrumentation/AddressSanitizer.cpp)

The run-time libraries tailored for AddressSanitizer can be found in compiler-rt/lib/asan and compiler-rt/lib/sanitizer_common.

• For GCC:

The instrumentation module is maintained in GCC backend.

(gcc/asan.c; gcc/config/riscv/riscv.c)

There are no individually developed run-time libraries for gcc. All the codes in libsanitzier/asan are merged from compiler-rt/lib/asan. So is sanitizer_common.

Stakeholders and Partners

• RISE-T-Head
• External
  • GCC and LLVM community

Measure of Success

Compare to ARM, RISC-V developer can get a fully functional and efficient AddressSanitizer tool to find the bug in the application. There are three milestones for the project.

• M1: Base functional(finish)
• M2: Fully functional with software solution(develop complete, upstreaming)
• M3: Fully functional with hardware extensions, more fast with new extension or new hardware feature.

Timeline

1. Enable AddressSanitizer for RISCV64 in GCC and LLVM - before
2. Enable Scudo for RISCV64 in LLVM on both clang side and compiler-rt side - Mar, 2023
3. Enable AddressSanitizer for RISCV32 in GCC and LLVM. (develop completed, upstreaming)- depend on the timeline of 32bit linux kernel
4. Enable RISCV memory tagging for Scudo, with the support of hardware extension. - 12/30/2023
5. Enable RISCV stack tagging in LLVM, with the support of hardware extension. - 12/30/2023

RISE Requirements

• Push the definition/standard for 32bit ecosystem move forward(linux kernel, ABI)

Dependencies

• 32bit-linux kernel
• ABI for 32bit application

Status

20 Sep 2023 

Replace malloc with Scudo in glibc, similar with what bionic does

30 Jul 2023 

Enable RISCV memory tagging for malloc in glibc

30 Jun 2023 

Enable AddressSanitizer for RISCV32 in GCC and LLVM. (develop completed, upstreaming)- depend on the timeline of 32bit linux kernel

31 Mar 2023 

Enable Scudo for RISCV64 in LLVM on both clang side and compiler-rt side.