Fix argument metadata when binding methods by YuriSizov · Pull Request #1509 · godotengine/godot-cpp

YuriSizov · 2024-06-27T16:52:29Z

While there doesn't seem to be any runtime issues, this triggers the address sanitizer in a few ways, depending on what kind of method you're binding.

For a method like this, with a return value

ClassDB::bind_method(D_METHOD("get_operator_count"), &SiOPMChannelParams::get_operator_count);

you get a container overflow. It even reaches the Godot side of things, but the bug is caused by godot-cpp all the same: the argument metadata is invalid.

Details

=================================================================
==21404==ERROR: AddressSanitizer: container-overflow on address 0x11fd3863b4b0 at pc 0x7ffaad1ccfbe bp 0x000b78fea5e0 sp 0x000b78fea5e0
READ of size 4 at 0x11fd3863b4b0 thread T0
    #0 0x7ffaad1ccfbd in godot::ClassDB::bind_method_godot(class godot::StringName const &, class godot::MethodBind *) C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:227
    #1 0x7ffaad1cc77d in godot::ClassDB::bind_methodfi(unsigned int, class godot::MethodBind *, struct godot::MethodDefinition const &, void const **, int) C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:183
    #2 0x7ffaace60e75 in godot::ClassDB::bind_method<struct godot::MethodDefinition, int (__cdecl SiOPMChannelParams::*)(void) const>(struct godot::MethodDefinition, int (__cdecl SiOPMChannelParams::*)(void) const) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:305
    #3 0x7ffaace55855 in SiOPMChannelParams::_bind_methods(void) C:\Projects\godot-extensions\gdsion\src\chip\siopm_channel_params.cpp:251
    #4 0x7ffaacda8843 in SiOPMChannelParams::initialize_class(void) C:\Projects\godot-extensions\gdsion\src\chip\siopm_channel_params.h:22
    #5 0x7ffaacd5fe36 in godot::ClassDB::_register_class<class SiOPMChannelParams, 1>(bool, bool, bool) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:271
    #6 0x7ffaacd71c3f in godot::ClassDB::register_abstract_class<class SiOPMChannelParams>(void) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:284
    #7 0x7ffaacd34cf8 in initialize_sion_module(enum godot::ModuleInitializationLevel) C:\Projects\godot-extensions\gdsion\src\register_types.cpp:89
    #8 0x7ffaad17d698 in godot::GDExtensionBinding::initialize_level(void *, enum GDExtensionInitializationLevel) C:\Projects\godot-extensions\gdsion\godot-cpp\src\godot.cpp:509
    #9 0x7ff7b34c3b91 in GDExtension::initialize_library(enum GDExtension::InitializationLevel) C:\Projects\godot-engine\master\core\extension\gdextension.cpp:856
    #10 0x7ff7b28af558 in GDExtensionManager::initialize_extensions(enum GDExtension::InitializationLevel) C:\Projects\godot-engine\master\core\extension\gdextension_manager.cpp:185
    #11 0x7ff7a4fa6578 in Main::setup2(void) C:\Projects\godot-engine\master\main\main.cpp:3116
    #12 0x7ff7a4f9c1ec in Main::setup(char const *, int, char **const, bool) C:\Projects\godot-engine\master\main\main.cpp:2465
    #13 0x7ff7a4dc5430 in widechar_main(int, wchar_t **) C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:165
    #14 0x7ff7a4dc5906 in _main(void) C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:206
    #15 0x7ff7a4dc5981 in main C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:220
    #16 0x7ff7a4dc478c in WinMain C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:233
    #17 0x7ff7b44e0379 in invoke_main D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:102
    #18 0x7ff7b44e0379 in __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
    #19 0x7ffb5070257c  (C:\Windows\System32\KERNEL32.DLL+0x18001257c)
    #20 0x7ffb51f0af27  (C:\Windows\SYSTEM32\ntdll.dll+0x18005af27)

0x11fd3863b4b0 is located 0 bytes inside of 4-byte region [0x11fd3863b4b0,0x11fd3863b4b4)
allocated by thread T0 here:
    #0 0x7ffaad35891e in operator new(unsigned __int64) D:\a\_work\1\s\src\vctools\asan\llvm\compiler-rt\lib\asan\asan_win_new_scalar_thunk.cpp:40
    #1 0x7ffaacd7f8a2 in std::_Default_allocate_traits::_Allocate(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\xmemory:77
    #2 0x7ffaacd365d1 in std::_Allocate<16, struct std::_Default_allocate_traits, 0>(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\xmemory:235
    #3 0x7ffaad1fc9bf in std::allocator<enum GDExtensionClassMethodArgumentMetadata>::allocate(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\xmemory:951
    #4 0x7ffaad1f8b6e in std::vector<enum GDExtensionClassMethodArgumentMetadata, class std::allocator<enum GDExtensionClassMethodArgumentMetadata>>::_Reallocate_exactly(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\vector:1608
    #5 0x7ffaad2002b3 in std::vector<enum GDExtensionClassMethodArgumentMetadata, class std::allocator<enum GDExtensionClassMethodArgumentMetadata>>::reserve(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\vector:1683
    #6 0x7ffaad1fe480 in godot::MethodBind::get_arguments_metadata_list(void) const C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\method_bind.hpp:134
    #7 0x7ffaad1ccb74 in godot::ClassDB::bind_method_godot(class godot::StringName const &, class godot::MethodBind *) C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:197
    #8 0x7ffaad1cc77d in godot::ClassDB::bind_methodfi(unsigned int, class godot::MethodBind *, struct godot::MethodDefinition const &, void const **, int) C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:183
    #9 0x7ffaace60e75 in godot::ClassDB::bind_method<struct godot::MethodDefinition, int (__cdecl SiOPMChannelParams::*)(void) const>(struct godot::MethodDefinition, int (__cdecl SiOPMChannelParams::*)(void) const) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:305
    #10 0x7ffaace55855 in SiOPMChannelParams::_bind_methods(void) C:\Projects\godot-extensions\gdsion\src\chip\siopm_channel_params.cpp:251
    #11 0x7ffaacda8843 in SiOPMChannelParams::initialize_class(void) C:\Projects\godot-extensions\gdsion\src\chip\siopm_channel_params.h:22
    #12 0x7ffaacd5fe36 in godot::ClassDB::_register_class<class SiOPMChannelParams, 1>(bool, bool, bool) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:271
    #13 0x7ffaacd71c3f in godot::ClassDB::register_abstract_class<class SiOPMChannelParams>(void) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:284
    #14 0x7ffaacd34cf8 in initialize_sion_module(enum godot::ModuleInitializationLevel) C:\Projects\godot-extensions\gdsion\src\register_types.cpp:89
    #15 0x7ffaad17d698 in godot::GDExtensionBinding::initialize_level(void *, enum GDExtensionInitializationLevel) C:\Projects\godot-extensions\gdsion\godot-cpp\src\godot.cpp:509
    #16 0x7ff7b34c3b91 in GDExtension::initialize_library(enum GDExtension::InitializationLevel) C:\Projects\godot-engine\master\core\extension\gdextension.cpp:856
    #17 0x7ff7b28af558 in GDExtensionManager::initialize_extensions(enum GDExtension::InitializationLevel) C:\Projects\godot-engine\master\core\extension\gdextension_manager.cpp:185
    #18 0x7ff7a4fa6578 in Main::setup2(void) C:\Projects\godot-engine\master\main\main.cpp:3116
    #19 0x7ff7a4f9c1ec in Main::setup(char const *, int, char **const, bool) C:\Projects\godot-engine\master\main\main.cpp:2465
    #20 0x7ff7a4dc5430 in widechar_main(int, wchar_t **) C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:165
    #21 0x7ff7a4dc5906 in _main(void) C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:206
    #22 0x7ff7a4dc5981 in main C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:220
    #23 0x7ff7a4dc478c in WinMain C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:233
    #24 0x7ff7b44e0379 in invoke_main D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:102
    #25 0x7ff7b44e0379 in __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
    #26 0x7ffb5070257c  (C:\Windows\System32\KERNEL32.DLL+0x18001257c)
    #27 0x7ffb51f0af27  (C:\Windows\SYSTEM32\ntdll.dll+0x18005af27)

HINT: if you don't care about these errors you may set ASAN_OPTIONS=detect_container_overflow=0.
If you suspect a false positive see also: https://github.com/google/sanitizers/wiki/AddressSanitizerContainerOverflow.
SUMMARY: AddressSanitizer: container-overflow C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:227 in godot::ClassDB::bind_method_godot(class godot::StringName const &, class godot::MethodBind *)
Shadow bytes around the buggy address:
  0x0438df5c7640: fa fa 00 fa fa fa 00 00 fa fa 00 fa fa fa fd fa
  0x0438df5c7650: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0438df5c7660: fa fa 00 fa fa fa fd fa fa fa 00 fa fa fa fd fa
  0x0438df5c7670: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0438df5c7680: fa fa 00 fa fa fa 00 fa fa fa 00 00 fa fa 00 00
=>0x0438df5c7690: fa fa 00 fa fa fa[fc]fa fa fa fa fa fa fa fa fa
  0x0438df5c76a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0438df5c76b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0438df5c76c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0438df5c76d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0438df5c76e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
Address Sanitizer Error: Container overflow

A method like this, without a return value and with arguments

ClassDB::bind_method(D_METHOD("set_operator_count", "value"), &SiOPMChannelParams::set_operator_count);

causes heap buffer overflow. The return value metadata is invalid.

Details

=================================================================
==19688==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x11d0c9ebb4f4 at pc 0x7ff7b34efdaa bp 0x00a4acdec700 sp 0x00a4acdec700
READ of size 4 at 0x11d0c9ebb4f4 thread T0
    #0 0x7ff7b34efda9 in GDExtensionMethodBind::update(struct GDExtensionClassMethodInfo const *) C:\Projects\godot-engine\master\core\extension\gdextension.cpp:355
    #1 0x7ff7b34d5673 in GDExtensionMethodBind::GDExtensionMethodBind(struct GDExtensionClassMethodInfo const *) C:\Projects\godot-engine\master\core\extension\gdextension.cpp:379
    #2 0x7ff7b34b85f3 in GDExtension::_register_extension_class_method(void *, void const *, struct GDExtensionClassMethodInfo const *) C:\Projects\godot-engine\master\core\extension\gdextension.cpp:594
    #3 0x7ffaad1cd0f7 in godot::ClassDB::bind_method_godot(class godot::StringName const &, class godot::MethodBind *) C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:234
    #4 0x7ffaad1cc77d in godot::ClassDB::bind_methodfi(unsigned int, class godot::MethodBind *, struct godot::MethodDefinition const &, void const **, int) C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:183
    #5 0x7ffaace980f5 in godot::ClassDB::bind_method<struct godot::MethodDefinition, void (__cdecl SiOPMChannelBase::*)(int)>(struct godot::MethodDefinition, void (__cdecl SiOPMChannelBase::*)(int)) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:305
    #6 0x7ffaace90fdf in SiOPMChannelBase::_bind_methods(void) C:\Projects\godot-extensions\gdsion\src\chip\channels\siopm_channel_base.cpp:469
    #7 0x7ffaacda8703 in SiOPMChannelBase::initialize_class(void) C:\Projects\godot-extensions\gdsion\src\chip\channels\siopm_channel_base.h:28
    #8 0x7ffaacd5e576 in godot::ClassDB::_register_class<class SiOPMChannelBase, 1>(bool, bool, bool) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:271
    #9 0x7ffaacd71bbf in godot::ClassDB::register_abstract_class<class SiOPMChannelBase>(void) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:284
    #10 0x7ffaacd34cf8 in initialize_sion_module(enum godot::ModuleInitializationLevel) C:\Projects\godot-extensions\gdsion\src\register_types.cpp:89
    #11 0x7ffaad17d698 in godot::GDExtensionBinding::initialize_level(void *, enum GDExtensionInitializationLevel) C:\Projects\godot-extensions\gdsion\godot-cpp\src\godot.cpp:509
    #12 0x7ff7b34c3b91 in GDExtension::initialize_library(enum GDExtension::InitializationLevel) C:\Projects\godot-engine\master\core\extension\gdextension.cpp:856
    #13 0x7ff7b28af558 in GDExtensionManager::initialize_extensions(enum GDExtension::InitializationLevel) C:\Projects\godot-engine\master\core\extension\gdextension_manager.cpp:185
    #14 0x7ff7a4fa6578 in Main::setup2(void) C:\Projects\godot-engine\master\main\main.cpp:3116
    #15 0x7ff7a4f9c1ec in Main::setup(char const *, int, char **const, bool) C:\Projects\godot-engine\master\main\main.cpp:2465
    #16 0x7ff7a4dc5430 in widechar_main(int, wchar_t **) C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:165
    #17 0x7ff7a4dc5906 in _main(void) C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:206
    #18 0x7ff7a4dc5981 in main C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:220
    #19 0x7ff7a4dc478c in WinMain C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:233
    #20 0x7ff7b44e0379 in invoke_main D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:102
    #21 0x7ff7b44e0379 in __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
    #22 0x7ffb5070257c  (C:\Windows\System32\KERNEL32.DLL+0x18001257c)
    #23 0x7ffb51f0af27  (C:\Windows\SYSTEM32\ntdll.dll+0x18005af27)

0x11d0c9ebb4f4 is located 4 bytes inside of 8-byte region [0x11d0c9ebb4f0,0x11d0c9ebb4f8)
allocated by thread T0 here:
    #0 0x7ffaad35891e in operator new(unsigned __int64) D:\a\_work\1\s\src\vctools\asan\llvm\compiler-rt\lib\asan\asan_win_new_scalar_thunk.cpp:40
    #1 0x7ffaacd7f8a2 in std::_Default_allocate_traits::_Allocate(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\xmemory:77
    #2 0x7ffaacd365d1 in std::_Allocate<16, struct std::_Default_allocate_traits, 0>(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\xmemory:235
    #3 0x7ffaad1fc9bf in std::allocator<enum GDExtensionClassMethodArgumentMetadata>::allocate(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\xmemory:951
    #4 0x7ffaad1f8b6e in std::vector<enum GDExtensionClassMethodArgumentMetadata, class std::allocator<enum GDExtensionClassMethodArgumentMetadata>>::_Reallocate_exactly(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\vector:1608
    #5 0x7ffaad2002b3 in std::vector<enum GDExtensionClassMethodArgumentMetadata, class std::allocator<enum GDExtensionClassMethodArgumentMetadata>>::reserve(unsigned __int64) C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.36.32532\include\vector:1683
    #6 0x7ffaad1fe480 in godot::MethodBind::get_arguments_metadata_list(void) const C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\method_bind.hpp:134
    #7 0x7ffaad1ccb74 in godot::ClassDB::bind_method_godot(class godot::StringName const &, class godot::MethodBind *) C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:197
    #8 0x7ffaad1cc77d in godot::ClassDB::bind_methodfi(unsigned int, class godot::MethodBind *, struct godot::MethodDefinition const &, void const **, int) C:\Projects\godot-extensions\gdsion\godot-cpp\src\core\class_db.cpp:183
    #9 0x7ffaace980f5 in godot::ClassDB::bind_method<struct godot::MethodDefinition, void (__cdecl SiOPMChannelBase::*)(int)>(struct godot::MethodDefinition, void (__cdecl SiOPMChannelBase::*)(int)) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:305
    #10 0x7ffaace90fdf in SiOPMChannelBase::_bind_methods(void) C:\Projects\godot-extensions\gdsion\src\chip\channels\siopm_channel_base.cpp:469
    #11 0x7ffaacda8703 in SiOPMChannelBase::initialize_class(void) C:\Projects\godot-extensions\gdsion\src\chip\channels\siopm_channel_base.h:28
    #12 0x7ffaacd5e576 in godot::ClassDB::_register_class<class SiOPMChannelBase, 1>(bool, bool, bool) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:271
    #13 0x7ffaacd71bbf in godot::ClassDB::register_abstract_class<class SiOPMChannelBase>(void) C:\Projects\godot-extensions\gdsion\godot-cpp\include\godot_cpp\core\class_db.hpp:284
    #14 0x7ffaacd34cf8 in initialize_sion_module(enum godot::ModuleInitializationLevel) C:\Projects\godot-extensions\gdsion\src\register_types.cpp:89
    #15 0x7ffaad17d698 in godot::GDExtensionBinding::initialize_level(void *, enum GDExtensionInitializationLevel) C:\Projects\godot-extensions\gdsion\godot-cpp\src\godot.cpp:509
    #16 0x7ff7b34c3b91 in GDExtension::initialize_library(enum GDExtension::InitializationLevel) C:\Projects\godot-engine\master\core\extension\gdextension.cpp:856
    #17 0x7ff7b28af558 in GDExtensionManager::initialize_extensions(enum GDExtension::InitializationLevel) C:\Projects\godot-engine\master\core\extension\gdextension_manager.cpp:185
    #18 0x7ff7a4fa6578 in Main::setup2(void) C:\Projects\godot-engine\master\main\main.cpp:3116
    #19 0x7ff7a4f9c1ec in Main::setup(char const *, int, char **const, bool) C:\Projects\godot-engine\master\main\main.cpp:2465
    #20 0x7ff7a4dc5430 in widechar_main(int, wchar_t **) C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:165
    #21 0x7ff7a4dc5906 in _main(void) C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:206
    #22 0x7ff7a4dc5981 in main C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:220
    #23 0x7ff7a4dc478c in WinMain C:\Projects\godot-engine\master\platform\windows\godot_windows.cpp:233
    #24 0x7ff7b44e0379 in invoke_main D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:102
    #25 0x7ff7b44e0379 in __scrt_common_main_seh D:\a\_work\1\s\src\vctools\crt\vcstartup\src\startup\exe_common.inl:288
    #26 0x7ffb5070257c  (C:\Windows\System32\KERNEL32.DLL+0x18001257c)
    #27 0x7ffb51f0af27  (C:\Windows\SYSTEM32\ntdll.dll+0x18005af27)

SUMMARY: AddressSanitizer: heap-buffer-overflow C:\Projects\godot-engine\master\core\extension\gdextension.cpp:355 in GDExtensionMethodBind::update(struct GDExtensionClassMethodInfo const *)
Shadow bytes around the buggy address:
  0x0406e3157640: fa fa 00 fa fa fa 00 00 fa fa 00 fa fa fa fd fa
  0x0406e3157650: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0406e3157660: fa fa 00 fa fa fa fd fa fa fa 00 fa fa fa fd fa
  0x0406e3157670: fa fa fd fa fa fa fd fa fa fa fd fa fa fa fd fa
  0x0406e3157680: fa fa 00 fa fa fa 00 fa fa fa 00 00 fa fa 00 00
=>0x0406e3157690: fa fa 00 fa fa fa 00 fa fa fa 00 fa fa fa[04]fa
  0x0406e31576a0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0406e31576b0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0406e31576c0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0406e31576d0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0406e31576e0: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
Address Sanitizer Error: Heap buffer overflow

Looks like this was introduced as is in #896, in commit e24b6b0. A similar method get_arguments_info_list had the same issue initially, but was corrected in b6ba0dc, all within the same PR.

I can't say if this change has any unexpected side effects, or if it fixes any outstanding issues (quite possible, anything related to arguments can be affected, I guess?), but I can confirm that with it included there are no asan issues in my project anymore.

While there doesn't seem to be any runtime issues, this triggers the address sanitizer in a few ways, depending on what kind of method you're binding.

AThousandShips

Makes sense, and matches the code in get_arguments_info_list

dsnopek

Great find, thanks!

hazelnutcloud · 2024-07-05T01:47:55Z

My extension fails at load because of this bug. Adding the changes here fixed it. Crashes when declaring the method_info variable in ClassDB::bind_method_godot when dereferencing the return_value_metadata which seems to be null because of an empty vector.

dsnopek · 2024-07-17T14:25:55Z

Cherry-picked for 4.2 in PR #1527

dsnopek · 2024-07-17T15:02:53Z

Cherry-picked for 4.1 in PR #1529

Fix argument metadata when binding methods

2b34bd0

While there doesn't seem to be any runtime issues, this triggers the address sanitizer in a few ways, depending on what kind of method you're binding.

YuriSizov requested a review from a team as a code owner June 27, 2024 16:52

AThousandShips added bug This has been identified as a bug topic:gdextension This relates to the new Godot 4 extension implementation cherrypick:4.2 labels Jun 27, 2024

AThousandShips added this to the 4.3 milestone Jun 27, 2024

AThousandShips approved these changes Jun 27, 2024

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dsnopek approved these changes Jun 27, 2024

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dsnopek merged commit 6d939e6 into godotengine:master Jul 6, 2024

YuriSizov deleted the method-bind-is-off-by-one branch July 6, 2024 18:04

dsnopek added cherrypick:4.1 and removed cherrypick:4.2 labels Jul 17, 2024

dsnopek removed the cherrypick:4.1 label Jul 17, 2024

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Fix argument metadata when binding methods#1509

Fix argument metadata when binding methods#1509
dsnopek merged 1 commit into
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YuriSizov:method-bind-is-off-by-one

YuriSizov commented Jun 27, 2024 •

edited

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hazelnutcloud commented Jul 5, 2024 •

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YuriSizov commented Jun 27, 2024 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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hazelnutcloud commented Jul 5, 2024 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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dsnopek commented Jul 17, 2024

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YuriSizov commented Jun 27, 2024 •

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hazelnutcloud commented Jul 5, 2024 •

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