| 설명 | ### Description
Dear developers,
We discovered a stack-overflow bug in the Lobster compiler. The crash is caused by infinite recursion between lobster::TypeName, lobster::FormatArg, and lobster::Signature within src/lobster/idents.h.
Vendor confirmed and fixed this vulnerability in commit [8ba49f9](https://github.com/aardappel/lobster/commit/8ba49f98ccfc9734ef352146806433a41d9f9aa6).
### Environment
- OS: Linux x86_64
- Complier: Clang
- Build Configuration: Release mode with ASan enabled.
### Vulnerability Details
- Vulnerability Type: stack-overflow (CWE-674: Uncontrolled Recursion)
- Location: src/lobster/idents.h (around lines 1466, 1519, and 1570)
### Reproduce
1. Build lobster with Release optimization and ASAN enabled.
2. Run with the crashing [file](https://github.com/oneafter/0204/blob/main/lob3/repro.lobster):
```
./bin/lobster repro.lobster
```
<details>
<summary>ASAN report</summary>
```
AddressSanitizer:DEADLYSIGNAL
=================================================================
==11819==ERROR: AddressSanitizer: stack-overflow on address 0x7ffd28ab5e28 (pc 0x55719039471a bp 0x7ffd28ab6670 sp 0x7ffd28ab5e30 T0)
#0 0x55719039471a in __asan_memcpy (/src/lobster/bin/lobster+0x13e71a) (BuildId: da4cf67d8898c669d2b638ef6ec3fbd965562c8f)
#1 0x5571905ceb75 in std::char_traits<char>::copy(char*, char const*, unsigned long) /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/char_traits.h:435:33
#2 0x5571905ceb75 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>::_S_copy(char*, char const*, unsigned long) /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/basic_string.h:430:4
#3 0x5571905ceb75 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>::_S_copy_chars(char*, char*, char*) /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/basic_string.h:478:9
#4 0x5571905ceb75 in void std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>::_M_construct<char*>(char*, char*, std::forward_iterator_tag) /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/basic_string.tcc:247:2
#5 0x5571905ceb75 in std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>::basic_string(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>> const&) /usr/lib/gcc/x86_64-linux-gnu/13/../../../../include/c++/13/bits/basic_string.h:551:2
#6 0x5571905ceb75 in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1508:16
#7 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#8 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#9 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#10 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#11 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#12 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#13 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#14 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#15 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#16 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#17 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#18 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#19 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#20 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#21 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#22 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#23 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#24 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#25 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#26 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#27 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#28 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#29 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#30 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#31 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#32 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#33 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#34 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#35 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#36 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#37 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#38 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#39 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#40 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#41 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#42 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#43 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#44 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#45 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#46 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, bool) /src/lobster/dev/src/lobster/idents.h:1570:19
#47 0x5571905d4e0f in lobster::FormatArg(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char>>&, std::basic_string_view<char, std::char_traits<char>>, unsigned long, lobster::UnTypeRef) /src/lobster/dev/src/lobster/idents.h:1466:14
#48 0x5571905cf02e in lobster::Signature[abi:cxx11](lobster::SubFunction const&) /src/lobster/dev/src/lobster/idents.h:1519:9
#49 0x55719043c6df in lobster::TypeName[abi:cxx11](lobster::UnTypeRef, boo |
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