New submission from alessandro mantovani <[email protected]>:
Use After Free in python3.11 (commit 2ab27c4af4ddf752)
Steps to reproduce:
1) ./configure --with-address-sanitizer
2) make
3) ./python <input>
I attach some of the input that lead to the undefined behavior
For the complete description you can find the asan report here:
==1082579==ERROR: AddressSanitizer: heap-use-after-free on address
0x626000045a40 at pc 0x000000735155 bp 0x7fffffffbed0 sp 0x7fffffffbec8
READ of size 8 at 0x626000045a40 thread T0
#0 0x735154 in ascii_decode
/home/elmanto/ddg/other_targets/cpython/Objects/unicodeobject.c:5091:28
#1 0x735154 in unicode_decode_utf8
/home/elmanto/ddg/other_targets/cpython/Objects/unicodeobject.c:5158:10
#2 0xc98381 in syntaxerror
/home/elmanto/ddg/other_targets/cpython/Parser/tokenizer.c:1087:15
#3 0xc8d616 in tok_get
/home/elmanto/ddg/other_targets/cpython/Parser/tokenizer.c
#4 0xc8696b in PyTokenizer_Get
/home/elmanto/ddg/other_targets/cpython/Parser/tokenizer.c:1884:18
#5 0xead74c in _PyPegen_check_tokenizer_errors
/home/elmanto/ddg/other_targets/cpython/Parser/pegen.c:1260:17
#6 0xead74c in _PyPegen_run_parser
/home/elmanto/ddg/other_targets/cpython/Parser/pegen.c:1292:17
#7 0xeaebca in _PyPegen_run_parser_from_file_pointer
/home/elmanto/ddg/other_targets/cpython/Parser/pegen.c:1377:14
#8 0xc83a91 in _PyParser_ASTFromFile
/home/elmanto/ddg/other_targets/cpython/Parser/peg_api.c:26:12
#9 0xa0abf1 in pyrun_file
/home/elmanto/ddg/other_targets/cpython/Python/pythonrun.c:1197:11
#10 0xa0abf1 in _PyRun_SimpleFileObject
/home/elmanto/ddg/other_targets/cpython/Python/pythonrun.c:455:13
#11 0xa09b19 in _PyRun_AnyFileObject
/home/elmanto/ddg/other_targets/cpython/Python/pythonrun.c:89:15
#12 0x4dfe94 in pymain_run_file_obj
/home/elmanto/ddg/other_targets/cpython/Modules/main.c:353:15
#13 0x4dfe94 in pymain_run_file
/home/elmanto/ddg/other_targets/cpython/Modules/main.c:372:15
#14 0x4dfe94 in pymain_run_python
/home/elmanto/ddg/other_targets/cpython/Modules/main.c:587:21
#15 0x4dfe94 in Py_RunMain
/home/elmanto/ddg/other_targets/cpython/Modules/main.c:666:5
#16 0x4e154c in pymain_main
/home/elmanto/ddg/other_targets/cpython/Modules/main.c:696:12
#17 0x4e1874 in Py_BytesMain
/home/elmanto/ddg/other_targets/cpython/Modules/main.c:720:12
#18 0x7ffff7a2e0b2 in __libc_start_main
/build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16
#19 0x43501d in _start
(/home/elmanto/ddg/other_targets/cpython/python+0x43501d)
0x626000045a40 is located 2368 bytes inside of 10560-byte region
[0x626000045100,0x626000047a40)
freed by thread T0 here:
#0 0x4ada79 in realloc
(/home/elmanto/ddg/other_targets/cpython/python+0x4ada79)
#1 0x638e61 in PyMem_RawRealloc
/home/elmanto/ddg/other_targets/cpython/Objects/obmalloc.c:602:12
#2 0x638e61 in _PyObject_Realloc
/home/elmanto/ddg/other_targets/cpython/Objects/obmalloc.c:2339:12
previously allocated by thread T0 here:
#0 0x4ada79 in realloc
(/home/elmanto/ddg/other_targets/cpython/python+0x4ada79)
#1 0x638e61 in PyMem_RawRealloc
/home/elmanto/ddg/other_targets/cpython/Objects/obmalloc.c:602:12
#2 0x638e61 in _PyObject_Realloc
/home/elmanto/ddg/other_targets/cpython/Objects/obmalloc.c:2339:12
SUMMARY: AddressSanitizer: heap-use-after-free
/home/elmanto/ddg/other_targets/cpython/Objects/unicodeobject.c:5091:28 in
ascii_decode
Shadow bytes around the buggy address:
0x0c4c80000af0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c4c80000b00: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c4c80000b10: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c4c80000b20: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c4c80000b30: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
=>0x0c4c80000b40: fd fd fd fd fd fd fd fd[fd]fd fd fd fd fd fd fd
0x0c4c80000b50: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c4c80000b60: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c4c80000b70: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c4c80000b80: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
0x0c4c80000b90: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
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
Shadow gap: cc
==1082579==ABORTING
----------
components: C API
files: crashes.tgz
messages: 395637
nosy: elmanto
priority: normal
severity: normal
status: open
title: Use-After-Free
type: security
versions: Python 3.11
Added file: https://bugs.python.org/file50105/crashes.tgz
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Python tracker <[email protected]>
<https://bugs.python.org/issue44396>
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