Out-of-bounds write in AST parser #104016
Description
Crash report
Reported by OSS-Fuzz (issue 58510).
Reproducer:
import ast ast.parse(bytes([ 0x46, 0x22, 0x76, 0x76, 0x3a, 0x6f, 0x72, 0x3a, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x77, 0x72, 0x3a, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x78, 0x3a, 0x77, 0x76, 0x3a, 0x3a, 0x20, 0x73, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x2e, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x77, 0x76, 0x3a, 0x3a, 0x20, 0x73, 0x61, 0x77, 0x76, 0x3a, 0x3a, 0x20, 0x73, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x2e, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x77, 0x76, 0x3a, 0x3a, 0x20, 0x73, 0x61, 0x77, 0x76, 0x3a, 0x3a, 0x20, 0x73, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x2e, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x2d, 0x7b, 0x22, 0x7b, 0x22, 0x46, 0x22, 0x76, 0x3a, 0x77, 0x76, 0x3a, 0x3a, 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0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0x81, 0xb5, 0xf3, 0xa0, 0x81, 0xa7, 0x7b, 0x15, 0x7b, 0xc0, 0xad, 0x7b, 0x7b, 0xc0, 0xad, 0x7b, 0x22]))Regression range: ece20db...6be7aee
Error messages
AddressSanitizer stack trace:
==2936==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x62a0000b91f4 at pc 0x000000c0a818 bp 0x7ffc21dc1e30 sp 0x7ffc21dc1e28 WRITE of size 1 at 0x62a0000b91f4 thread T0 SCARINESS: 31 (1-byte-write-heap-buffer-overflow) #0 0xc0a817 in tok_get_normal_mode cpython/Parser/tokenizer.c:2240:41 #1 0xbf81d5 in tok_get cpython/Parser/tokenizer.c:2676:16 #2 0xbf81d5 in _PyTokenizer_Get cpython/Parser/tokenizer.c:2685:18 #3 0xb46ffa in _PyPegen_tokenize_full_source_to_check_for_errors cpython/Parser/pegen_errors.c:171:17 #4 0xb46c26 in _Pypegen_set_syntax_error cpython/Parser/pegen_errors.c:0 #5 0xb4313c in _PyPegen_run_parser cpython/Parser/pegen.c:858:9 #6 0xb43a4d in _PyPegen_run_parser_from_string cpython/Parser/pegen.c:952:14 #7 0xbf4ec7 in _PyParser_ASTFromString cpython/Parser/peg_api.c:14:21 #8 0x95dab9 in Py_CompileStringObject cpython/Python/pythonrun.c:1771:11 #9 0x7d8af6 in builtin_compile_impl cpython/Python/bltinmodule.c:831:14 #10 0x7d8af6 in builtin_compile cpython/Python/clinic/bltinmodule.c.h:383:20 #11 0xca3720 in cfunction_vectorcall_FASTCALL_KEYWORDS cpython/Objects/methodobject.c:438:24 #12 0x5c1b88 in _PyObject_VectorcallTstate cpython/Include/internal/pycore_call.h:92:11 #13 0x5c1b88 in PyObject_Vectorcall cpython/Objects/call.c:301:12 #14 0x7f427f in _PyEval_EvalFrameDefault cpython/Python/bytecodes.c:2577:19 #15 0x7e2a1f in _PyEval_EvalFrame cpython/Include/internal/pycore_ceval.h:88:16 #16 0x7e2a1f in _PyEval_Vector cpython/Python/ceval.c:1529:12 #17 0x5c261e in _PyFunction_Vectorcall cpython/Objects/call.c:0 #18 0x5c193f in _PyVectorcall_Call cpython/Objects/call.c:247:16 #19 0x5c1f22 in _PyObject_Call cpython/Objects/call.c:330:16 #20 0x5c2a23 in PyObject_CallObject cpython/Objects/call.c:454:12 #21 0x593bc4 in LLVMFuzzerTestOneInput python-library-fuzzers/fuzzer.cpp:134:14 #22 0x461943 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15 #23 0x44d0a2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6 #24 0x45294c in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9 #25 0x47be82 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10 #26 0x7eafaded4082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/libc-start.c:308:16 #27 0x44326d in _start 0x62a0000b91f4 is located 4 bytes to the right of 20464-byte region [0x62a0000b4200,0x62a0000b91f0) allocated by thread T0 here: #0 0x552ad6 in __interceptor_malloc /src/llvm-project/compiler-rt/lib/asan/asan_malloc_linux.cpp:69:3 #1 0x68ee29 in _PyMem_RawMalloc cpython/Objects/obmalloc.c:42:12 #2 0x691e7a in PyMem_Malloc cpython/Objects/obmalloc.c:587:12 #3 0xbf580a in tok_new cpython/Parser/tokenizer.c:74:49 #4 0xbf580a in _PyTokenizer_FromString cpython/Parser/tokenizer.c:884:29 #5 0xb43752 in _PyPegen_run_parser_from_string cpython/Parser/pegen.c:929:15 #6 0xbf4ec7 in _PyParser_ASTFromString cpython/Parser/peg_api.c:14:21 #7 0x95dab9 in Py_CompileStringObject cpython/Python/pythonrun.c:1771:11 #8 0x7d8af6 in builtin_compile_impl cpython/Python/bltinmodule.c:831:14 #9 0x7d8af6 in builtin_compile cpython/Python/clinic/bltinmodule.c.h:383:20 #10 0xca3720 in cfunction_vectorcall_FASTCALL_KEYWORDS cpython/Objects/methodobject.c:438:24 #11 0x5c1b88 in _PyObject_VectorcallTstate cpython/Include/internal/pycore_call.h:92:11 #12 0x5c1b88 in PyObject_Vectorcall cpython/Objects/call.c:301:12 #13 0x7f427f in _PyEval_EvalFrameDefault cpython/Python/bytecodes.c:2577:19 #14 0x7e2a1f in _PyEval_EvalFrame cpython/Include/internal/pycore_ceval.h:88:16 #15 0x7e2a1f in _PyEval_Vector cpython/Python/ceval.c:1529:12 #16 0x5c261e in _PyFunction_Vectorcall cpython/Objects/call.c:0 #17 0x5c193f in _PyVectorcall_Call cpython/Objects/call.c:247:16 #18 0x5c1f22 in _PyObject_Call cpython/Objects/call.c:330:16 #19 0x5c2a23 in PyObject_CallObject cpython/Objects/call.c:454:12 #20 0x593bc4 in LLVMFuzzerTestOneInput python-library-fuzzers/fuzzer.cpp:134:14 #21 0x461943 in fuzzer::Fuzzer::ExecuteCallback(unsigned char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerLoop.cpp:611:15 #22 0x44d0a2 in fuzzer::RunOneTest(fuzzer::Fuzzer*, char const*, unsigned long) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:324:6 #23 0x45294c in fuzzer::FuzzerDriver(int*, char***, int (*)(unsigned char const*, unsigned long)) /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerDriver.cpp:860:9 #24 0x47be82 in main /src/llvm-project/compiler-rt/lib/fuzzer/FuzzerMain.cpp:20:10 #25 0x7eafaded4082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/libc-start.c:308:16 Your environment
Linux x64, latest cpython main branch checkout.