build: Support ASAN for boost coroutine2 using ucontext (#6531)

cmake/flags.cmake

@@ -205,6 +205,13 @@ function(setupBuildFlags)
         -fsanitize-coverage=edge,indirect-calls
       )
 
+      # Support ASAN within coroutines2.
+      # Note that __ucontext__ is orders of magnitude slower than __fcontext__.
+      target_compile_definitions(cxx_settings INTERFACE
+        BOOST_USE_UCONTEXT
+        BOOST_USE_ASAN
+      )
+
       # Require at least address (may be refactored out)
       target_link_options(cxx_settings INTERFACE
         -fsanitize=address

libraries/cmake/source/boost/CMakeLists.txt

@@ -676,6 +676,10 @@ endfunction()
 function(generateBoostContext)
   set(library_root "${BOOST_ROOT}/libs/context")
 
+  set(source_files
+    "${library_root}/src/execution_context.cpp"
+  )
+
   if(DEFINED PLATFORM_LINUX)
     set(asm_source_file_list
       "${library_root}/src/asm/jump_x86_64_sysv_elf_gas.S"
@@ -710,8 +714,14 @@ function(generateBoostContext)
     endif()
   endforeach()
 
+  if(OSQUERY_ENABLE_ADDRESS_SANITIZER)
+    list(APPEND source_files
+      "${library_root}/src/fiber.cpp"
+    )
+  endif()
+
   add_library(thirdparty_boost_context STATIC
-    "${library_root}/src/execution_context.cpp"
+    ${source_files}
     ${asm_source_file_list}
   )