Merge pull request MicrosoftDocs#4441 from MicrosoftDocs/main638131195479002946sync_temp

learn-build-service-prod[bot] · web-flow · commit 972e660f808c · 2023-02-27T18:32:35.000Z
For protected CLA branch, push strategy should use PR and merge to target branch method to work around git push error
diff --git a/docs/sanitizers/asan-runtime.md b/docs/sanitizers/asan-runtime.md
@@ -79,12 +79,12 @@ For more information, see the [Differences with Clang 12.0](asan.md#differences)
 ### MSVC-specific AddressSanitizer runtime options
 
 - `windows_hook_legacy_allocators`
-  Boolean, set to `true` to enable interception of [`GlobalAlloc`](/windows/win32/api/winbase/nf-winbase-globalalloc) and [`LocalAlloc`](/windows/win32/api/winbase/nf-winbase-localalloc) allocators.
+  Boolean, set to `false` to disable interception of [`GlobalAlloc`](/windows/win32/api/winbase/nf-winbase-globalalloc) and [`LocalAlloc`](/windows/win32/api/winbase/nf-winbase-localalloc) allocators.
 
-> [!NOTE]
-> The option `windows_hook_legacy_allocators` wasn't available in the public llvm-project runtime when this article was written. The option may eventually be contributed back to the public project; however, it's dependent on code review and community acceptance.
->
-> The option `windows_hook_rtl_allocators`, previously an opt-in feature while AddressSanitizer was experimental, is now enabled by default.
+  > [!NOTE]
+  > The option `windows_hook_legacy_allocators` wasn't available in the public llvm-project runtime when this article was written. The option may eventually be contributed back to the public project; however, it's dependent on code review and community acceptance.
+  >
+  > The option `windows_hook_rtl_allocators`, previously an opt-in feature while AddressSanitizer was experimental, is now enabled by default. In versions before Visual Studio 2022 version 17.4.6, the default option value is `false`. In Visual Studio 2022 version 17.4.6 and later versions, the option `windows_hook_rtl_allocators` defaults to `true`.
 
 - `iat_overwrite`
   String, set to `"error"` by default. Other possible values are `"protect"` and `"ignore"`. Some modules may overwrite the [`import address table`](/windows/win32/debug/pe-format#import-address-table) of other modules to customize implementations of certain functions. For example, drivers commonly provide custom implementations for specific hardware. The `iat_overwrite` option manages the AddressSanitizer runtime's protection against overwrites for specific [`memoryapi.h`](/windows/win32/api/memoryapi/) functions. The runtime currently tracks the [`VirtualAlloc`](/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc), [`VirtualProtect`](/windows/win32/api/memoryapi/nf-memoryapi-virtualprotect), and [`VirtualQuery`](/windows/win32/api/memoryapi/nf-memoryapi-virtualquery) functions for protection. This option is available in Visual Studio 2022 version 17.5 preview 1 and later versions. The following `iat_overwrite` values control how the runtime reacts when protected functions are overwritten:
@@ -177,8 +177,8 @@ The AddressSanitizer runtime hot-patches many functions to enable memory safety
 
 ### Optional interceptors
 
-The interceptors listed here are only installed when an AddressSanitizer runtime option is enabled. Set `windows_hook_legacy_allocators` to `true` to enable legacy allocator interception.
-`set ASAN_OPTIONS=windows_hook_legacy_allocators=true`
+The interceptors listed here are only installed when an AddressSanitizer runtime option is enabled. Set `windows_hook_legacy_allocators` to `false` to disable legacy allocator interception.
+`set ASAN_OPTIONS=windows_hook_legacy_allocators=false`
 
 - [`GlobalAlloc`](/windows/win32/api/winbase/nf-winbase-globalalloc)
 - [`GlobalFree`](/windows/win32/api/winbase/nf-winbase-GlobalFree)
