[all-commits] [llvm/llvm-project] 36f9d5: [ASan] Document define to disable container overfl...

[Paddy McDonald via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 36f9d5a41f0eff44e65f09240c7ca454c47b35cd
      https://github.com/llvm/llvm-project/commit/36f9d5a41f0eff44e65f09240c7ca454c47b35cd
  Author: Paddy McDonald <padriff at hotmail.com>
  Date:   2025-11-19 (Wed, 19 Nov 2025)

  Changed paths:
    M clang/docs/AddressSanitizer.rst
    M compiler-rt/include/sanitizer/common_interface_defs.h
    M compiler-rt/lib/asan/asan_errors.cpp
    A compiler-rt/test/asan/TestCases/disable_container_overflow_checks.cpp
    A compiler-rt/test/asan/TestCases/stack_container_dynamic_lib.cpp

  Log Message:
  -----------
  [ASan] Document define to disable container overflow checks at compile time. (#163468)

Document a define to allow library developers to support disabling 
AddressSanitizer's container overflow detection in template code at 
compile time.

The primary motivation is to reduce false positives in environments
where
libraries and frameworks that cannot be recompiled with sanitizers
enabled
are called from application code. This supports disabling checks when
the
runtime environment cannot be reliably controlled to use ASAN_OPTIONS.

Key changes:
- Use the define `__SANITIZER_DISABLE_CONTAINER_OVERFLOW__` to disable
  instrumentation at compile time
- Implemented redefining the container overflow APIs in
common_interface_defs.h
  to use define to provide null implementation when define is present
- Update documentation in AddressSanitizer.rst to suggest and illustrate
  use of the define
- Add details of the define in PrintContainerOverflowHint()
- Add test disable_container_overflow_checks to verify new hints on the
error and fill the testing gap that
ASAN_OPTIONS=detect_container_overflow=0
  works
- Add tests demonstrating the issue around closed source libraries and 
  instrumented apps that both modify containers

This requires no compiler changes and should be supportable cross
compiler toolchains.

An RFC has been opened to discuss: 

https://discourse.llvm.org/t/rfc-add-fsanitize-address-disable-container-overflow-flag-to-addresssanitizer/88349



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