AddressSanitizer: SEGV on unknown address 0x7fab556df550

[beginvuln]

BPO	29485
Nosy	@matrixise
Files	cfield_1336: PoC

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2017-02-08.14:46:55.467>
created_at = <Date 2017-02-08.14:42:58.297>
labels = ['type-security', 'interpreter-core']
title = 'AddressSanitizer: SEGV on unknown address 0x7fab556df550'
updated_at = <Date 2017-02-08.14:46:55.444>
user = 'https://bugs.python.org/beginvuln'

bugs.python.org fields:

activity = <Date 2017-02-08.14:46:55.444>
actor = 'matrixise'
assignee = 'none'
closed = True
closed_date = <Date 2017-02-08.14:46:55.467>
closer = 'matrixise'
components = ['Interpreter Core']
creation = <Date 2017-02-08.14:42:58.297>
creator = 'beginvuln'
dependencies = []
files = ['46580']
hgrepos = []
issue_num = 29485
keywords = []
message_count = 2.0
messages = ['287319', '287324']
nosy_count = 2.0
nosy_names = ['matrixise', 'beginvuln']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'security'
url = 'https://bugs.python.org/issue29485'
versions = ['Python 3.6']

[beginvuln]

OS Version : Ubuntu 16.04 LTS
Python download link : https://www.python.org/ftp/python/3.6.0/Python-3.6.0.tar.xz

Python version : 3.6.0

Normal build cmd :
./configure
make

Asan build cmd:
export CC="/usr/bin/clang -fsanitize=address
export CXX="/usr/bin/clang++ -fsanitize=address
./confiugre
make

GDB with exploitable:

To enable execution of this file add
add-auto-load-safe-path /home/test/check/PythonGDB/python-gdb.py
line to your configuration file "/home/test/.gdbinit".
To completely disable this security protection add
set auto-load safe-path /
line to your configuration file "/home/test/.gdbinit".
For more information about this security protection see the
"Auto-loading safe path" section in the GDB manual. E.g., run from the shell:
info "(gdb)Auto-loading safe path"
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
z_get (ptr=0x7ffff5bba5d8, size=8) at /home/test/check/PythonGDB/Modules/_ctypes/cfield.c:1336
1336 if (*(void **)ptr) {
Description: Access violation on source operand
Short description: SourceAv (19/22)
Hash: 3930661c9a0f4c1f31bb4f2341bca47f.d4e21449248c6102834e8b566f6b2ac9
Exploitability Classification: UNKNOWN
Explanation: The target crashed on an access violation at an address matching the source operand of the current instruction. This likely indicates a read access violation.
Other tags: AccessViolation (21/22)

ASAN:

ASAN:DEADLYSIGNAL
=================================================================
==18885==ERROR: AddressSanitizer: SEGV on unknown address 0x7fab556df550 (pc 0x7fab558d0cd1 bp 0x7fab5a4b0b90 sp 0x7ffc9cbcc220 T0)
#0 0x7fab558d0cd0 in z_get /home/test/check/PythonASAN/Modules/_ctypes/cfield.c:1336
#1 0x7fab558d0cd0 in ?? ??:0
#2 0x63ac07 in _PyObject_GenericGetAttrWithDict /home/test/check/PythonASAN/Objects/object.c:1060
#3 0x63ac07 in ?? ??:0
#4 0x7966cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:2815 (discriminator 1)
#5 0x7966cc in ?? ??:0
#6 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#7 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#8 0x7a9847 in ?? ??:0
#9 0x7ab648 in fast_function /home/test/check/PythonASAN/Python/ceval.c:4929 (discriminator 1)
#10 0x7ab648 in ?? ??:0
#11 0x7a76f2 in call_function /home/test/check/PythonASAN/Python/ceval.c:4809
#12 0x7a76f2 in ?? ??:0
#13 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
#14 0x7995cc in ?? ??:0
#15 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#16 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#17 0x7a9847 in ?? ??:0
#18 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
#19 0x7ac2ea in ?? ??:0
#20 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
#21 0x574668 in ?? ??:0
#22 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
#23 0x5749fa in ?? ??:0
#24 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
#25 0x573e9b in ?? ??:0
#26 0x793369 in do_call_core /home/test/check/PythonASAN/Python/ceval.c:5057
#27 0x793369 in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3357
#28 0x793369 in ?? ??:0
#29 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#30 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#31 0x7a9847 in ?? ??:0
#32 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
#33 0x7ac2ea in ?? ??:0
#34 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
#35 0x574668 in ?? ??:0
#36 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
#37 0x5749fa in ?? ??:0
#38 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
#39 0x573e9b in ?? ??:0
#40 0x66efe4 in slot_tp_call /home/test/check/PythonASAN/Objects/typeobject.c:6167
#41 0x66efe4 in ?? ??:0
#42 0x5745f0 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2316
#43 0x5745f0 in ?? ??:0
#44 0x7a7429 in call_function /home/test/check/PythonASAN/Python/ceval.c:4812
#45 0x7a7429 in ?? ??:0
#46 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
#47 0x7995cc in ?? ??:0
#48 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#49 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#50 0x7a9847 in ?? ??:0
#51 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
#52 0x7ac2ea in ?? ??:0
#53 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
#54 0x574668 in ?? ??:0
#55 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
#56 0x5749fa in ?? ??:0
#57 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
#58 0x573e9b in ?? ??:0
#59 0x793369 in do_call_core /home/test/check/PythonASAN/Python/ceval.c:5057
#60 0x793369 in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3357
#61 0x793369 in ?? ??:0
#62 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#63 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#64 0x7a9847 in ?? ??:0
#65 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
#66 0x7ac2ea in ?? ??:0
#67 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
#68 0x574668 in ?? ??:0
#69 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
#70 0x5749fa in ?? ??:0
#71 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
#72 0x573e9b in ?? ??:0
#73 0x66efe4 in slot_tp_call /home/test/check/PythonASAN/Objects/typeobject.c:6167
#74 0x66efe4 in ?? ??:0
#75 0x5745f0 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2316
#76 0x5745f0 in ?? ??:0
#77 0x7a7429 in call_function /home/test/check/PythonASAN/Python/ceval.c:4812
#78 0x7a7429 in ?? ??:0
#79 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
#80 0x7995cc in ?? ??:0
#81 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#82 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#83 0x7a9847 in ?? ??:0
#84 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
#85 0x7ac2ea in ?? ??:0
#86 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
#87 0x574668 in ?? ??:0
#88 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
#89 0x5749fa in ?? ??:0
#90 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
#91 0x573e9b in ?? ??:0
#92 0x793369 in do_call_core /home/test/check/PythonASAN/Python/ceval.c:5057
#93 0x793369 in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3357
#94 0x793369 in ?? ??:0
#95 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#96 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#97 0x7a9847 in ?? ??:0
#98 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
#99 0x7ac2ea in ?? ??:0
#100 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
#101 0x574668 in ?? ??:0
#102 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
#103 0x5749fa in ?? ??:0
#104 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
#105 0x573e9b in ?? ??:0
#106 0x66efe4 in slot_tp_call /home/test/check/PythonASAN/Objects/typeobject.c:6167
#107 0x66efe4 in ?? ??:0
#108 0x5745f0 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2316
#109 0x5745f0 in ?? ??:0
#110 0x7a7429 in call_function /home/test/check/PythonASAN/Python/ceval.c:4812
#111 0x7a7429 in ?? ??:0
#112 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
#113 0x7995cc in ?? ??:0
#114 0x7ab4cb in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#115 0x7ab4cb in _PyFunction_FastCall /home/test/check/PythonASAN/Python/ceval.c:4870
#116 0x7ab4cb in fast_function /home/test/check/PythonASAN/Python/ceval.c:4905
#117 0x7ab4cb in ?? ??:0
#118 0x7a76f2 in call_function /home/test/check/PythonASAN/Python/ceval.c:4809
#119 0x7a76f2 in ?? ??:0
#120 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
#121 0x7995cc in ?? ??:0
#122 0x7ab4cb in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#123 0x7ab4cb in _PyFunction_FastCall /home/test/check/PythonASAN/Python/ceval.c:4870
#124 0x7ab4cb in fast_function /home/test/check/PythonASAN/Python/ceval.c:4905
#125 0x7ab4cb in ?? ??:0
#126 0x7a76f2 in call_function /home/test/check/PythonASAN/Python/ceval.c:4809
#127 0x7a76f2 in ?? ??:0
#128 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
#129 0x7995cc in ?? ??:0
#130 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#131 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#132 0x7a9847 in ?? ??:0
#133 0x7ac2ea in _PyFunction_FastCallDict /home/test/check/PythonASAN/Python/ceval.c:5021
#134 0x7ac2ea in ?? ??:0
#135 0x574668 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2295
#136 0x574668 in ?? ??:0
#137 0x5749fa in _PyObject_Call_Prepend /home/test/check/PythonASAN/Objects/abstract.c:2358
#138 0x5749fa in ?? ??:0
#139 0x573e9b in PyObject_Call /home/test/check/PythonASAN/Objects/abstract.c:2246
#140 0x573e9b in ?? ??:0
#141 0x6713f8 in slot_tp_init /home/test/check/PythonASAN/Objects/typeobject.c:6380
#142 0x6713f8 in ?? ??:0
#143 0x666d8d in type_call /home/test/check/PythonASAN/Objects/typeobject.c:915 (discriminator 1)
#144 0x666d8d in ?? ??:0
#145 0x5745f0 in _PyObject_FastCallDict /home/test/check/PythonASAN/Objects/abstract.c:2316
#146 0x5745f0 in ?? ??:0
#147 0x7a7429 in call_function /home/test/check/PythonASAN/Python/ceval.c:4812
#148 0x7a7429 in ?? ??:0
#149 0x7995cc in _PyEval_EvalFrameDefault /home/test/check/PythonASAN/Python/ceval.c:3275
#150 0x7995cc in ?? ??:0
#151 0x7a9847 in PyEval_EvalFrameEx /home/test/check/PythonASAN/Python/ceval.c:718
#152 0x7a9847 in _PyEval_EvalCodeWithName /home/test/check/PythonASAN/Python/ceval.c:4119
#153 0x7a9847 in ?? ??:0
#154 0x78e0df in PyEval_EvalCodeEx /home/test/check/PythonASAN/Python/ceval.c:4140
#155 0x78e0df in PyEval_EvalCode /home/test/check/PythonASAN/Python/ceval.c:695
#156 0x78e0df in ?? ??:0
#157 0x5142f5 in run_mod /home/test/check/PythonASAN/Python/pythonrun.c:980
#158 0x5142f5 in PyRun_FileExFlags /home/test/check/PythonASAN/Python/pythonrun.c:933
#159 0x5142f5 in ?? ??:0
#160 0x512afa in PyRun_SimpleFileExFlags /home/test/check/PythonASAN/Python/pythonrun.c:396
#161 0x512afa in ?? ??:0
#162 0x53eefd in run_file /home/test/check/PythonASAN/Modules/main.c:320
#163 0x53eefd in Py_Main /home/test/check/PythonASAN/Modules/main.c:780
#164 0x53eefd in ?? ??:0
#165 0x503d16 in main /home/test/check/PythonASAN/./Programs/python.c:69
#166 0x503d16 in ?? ??:0
#167 0x7fab5921b82f in __libc_start_main /build/glibc-GKVZIf/glibc-2.23/csu/../csu/libc-start.c:291
#168 0x7fab5921b82f in ?? ??:0
#169 0x432548 in _start ??:?
#170 0x432548 in ?? ??:0

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV (/home/test/check/PythonASAN/build/lib.linux-x86_64-3.6/_ctypes.cpython-36m-x86_64-linux-gnu.so+0x36cd0)
==18885==ABORTING

[matrixise]

See #bpo-29486