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  1. Qt
  2. QTBUG-104261

tst_qstringconverter::roundtrip() ASAN error stack-use-after-scope

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    • Linux/X11
    • 2a1122f465 (qt/qtbase/dev) 2a1122f465 (qt/tqtc-qtbase/dev) 34a130a2da (qt/qtbase/6.4) 34a130a2da (qt/tqtc-qtbase/6.4)

      NOTE: It is a custom optimised debug build using clang-13. In particular I use configure -debug but also add CMAKE_CXX_FLAGS=-Og -DNDEBUG.

      $ tests/auto/corelib/text/qstringconverter/tst_qstringconverter roundtrip

      ********* Start testing of tst_QStringConverter *********
Config: Using QtTest library 6.5.0, Qt 6.5.0 (x86_64-little_endian-lp64 shared (dynamic) debug build; by Ubuntu Clang 13.0.1), ubuntu 20.04
QINFO  : tst_QStringConverter::initTestCase() System locale is UTF-8
PASS   : tst_QStringConverter::initTestCase()
PASS   : tst_QStringConverter::roundtrip(UTF-8:empty)
PASS   : tst_QStringConverter::roundtrip(UTF-8:null-character)
PASS   : tst_QStringConverter::roundtrip(UTF-8:ascii-text)
PASS   : tst_QStringConverter::roundtrip(UTF-8:ascii-with-carriage-return)
PASS   : tst_QStringConverter::roundtrip(UTF-8:ascii-with-control)
PASS   : tst_QStringConverter::roundtrip(UTF-8:nbsp)
PASS   : tst_QStringConverter::roundtrip(UTF-8:latin1-text)
PASS   : tst_QStringConverter::roundtrip(UTF-8:euro)
PASS   : tst_QStringConverter::roundtrip(UTF-8:character+bom)
PASS   : tst_QStringConverter::roundtrip(UTF-8:last-bmp)
PASS   : tst_QStringConverter::roundtrip(UTF-8:character+last-bmp)
PASS   : tst_QStringConverter::roundtrip(UTF-8:replacement)
PASS   : tst_QStringConverter::roundtrip(UTF-8:supplementary-plane)
PASS   : tst_QStringConverter::roundtrip(UTF-8:mahjong)
PASS   : tst_QStringConverter::roundtrip(UTF-8:emojis)
PASS   : tst_QStringConverter::roundtrip(UTF-8:last-valid)
PASS   : tst_QStringConverter::roundtrip(UTF-8:mixed-bmp-only)
PASS   : tst_QStringConverter::roundtrip(UTF-8:mixed-full)
PASS   : tst_QStringConverter::roundtrip(UTF-8:xml)
=================================================================

      ==1793072==ERROR: AddressSanitizer: stack-use-after-scope on address 0x7ffd886744b0 at pc 0x7f7b22cd3e83 bp 0x7ffd88673560 sp 0x7ffd88673558
READ of size 2 at 0x7ffd886744b0 thread T0
    #0 0x7f7b22cd3e82 in QUtf8::convertFromUnicode(char*, QStringView, QStringConverterBase::State*) /home/cc-runs/src/qt/qt5/qtbase/src/corelib/text/qstringconverter.cpp:543:27
    #1 0x515940 in QStringEncoder::encodeAsByteArray(QStringView) /home/sanitizer-runs/sanitizer_runs/build/qtbase-asan/include/QtCore/../../../../../../cc-runs/src/qt/qt5/qtbase/src/corelib/text/qstringconverter.h:84:15
    #2 0x4d6a8c in QStringEncoder::DecodedData<QStringView>::operator QByteArray() const /home/sanitizer-runs/sanitizer_runs/build/qtbase-asan/include/QtCore/../../../../../../cc-runs/src/qt/qt5/qtbase/src/corelib/text/qstringconverter.h:50:55
    #3 0x4d6a8c in tst_QStringConverter::roundtrip() /home/cc-runs/src/qt/qt5/qtbase/tests/auto/corelib/text/qstringconverter/tst_qstringconverter.cpp:370:26
    #4 0x51147d in tst_QStringConverter::qt_static_metacall(QObject*, QMetaObject::Call, int, void**) /home/sanitizer-runs/sanitizer_runs/build/qtbase-asan/tests/auto/corelib/text/qstringconverter/tst_qstringconverter_autogen/include/tst_qstringconverter.moc:175:21
    #5 0x7f7b229de11e in QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const /home/cc-runs/src/qt/qt5/qtbase/src/corelib/kernel/qmetaobject.cpp:2357:13
    #6 0x7f7b235bad37 in QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const /home/sanitizer-runs/sanitizer_runs/build/qtbase-asan/include/QtCore/../../../../../../cc-runs/src/qt/qt5/qtbase/src/corelib/kernel/qmetaobject.h:90:16
    #7 0x7f7b235bad37 in QTest::TestMethods::invokeTestOnData(int) const /home/cc-runs/src/qt/qt5/qtbase/src/testlib/qtestcase.cpp:1120:45
    #8 0x7f7b235bcd1f in QTest::TestMethods::invokeTest(int, QLatin1String, QTest::WatchDog*) const /home/cc-runs/src/qt/qt5/qtbase/src/testlib/qtestcase.cpp:1379:17
    #9 0x7f7b235c03c4 in QTest::TestMethods::invokeTests(QObject*) const /home/cc-runs/src/qt/qt5/qtbase/src/testlib/qtestcase.cpp:1718:33
    #10 0x7f7b235c2633 in QTest::qRun() /home/cc-runs/src/qt/qt5/qtbase/src/testlib/qtestcase.cpp:2283:14
    #11 0x7f7b235c0df4 in QTest::qExec(QObject*, int, char**) /home/cc-runs/src/qt/qt5/qtbase/src/testlib/qtestcase.cpp:2183:15
    #12 0x51121d in main /home/cc-runs/src/qt/qt5/qtbase/tests/auto/corelib/text/qstringconverter/tst_qstringconverter.cpp:2123:1
    #13 0x7f7b2212b082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
    #14 0x41e82d in _start (/home/sanitizer-runs/sanitizer_runs/build/qtbase-asan/tests/auto/corelib/text/qstringconverter/tst_qstringconverter+0x41e82d)

      Address 0x7ffd886744b0 is located in stack of thread T0 at offset 976 in frame
    #0 0x7f7b229dd27f in QMetaMethod::invoke(QObject*, Qt::ConnectionType, QGenericReturnArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument, QGenericArgument) const /home/cc-runs/src/qt/qt5/qtbase/src/corelib/kernel/qmetaobject.cpp:2274

  This frame has 21 object(s):
    [32, 48) 'val0.byval'
    [64, 80) 'val1.byval'
    [96, 112) 'val2.byval'
    [128, 144) 'val3.byval'
    [160, 176) 'val4.byval'
    [192, 208) 'val5.byval'
    [224, 240) 'val6.byval'
    [256, 272) 'val7.byval'
    [288, 304) 'val8.byval'
    [320, 336) 'val9.byval'
    [352, 376) 'normalized' (line 2285)
    [416, 424) 'ref.tmp' (line 2289)
    [448, 536) 'typeNames' (line 2296)
    [576, 664) 'param' (line 2337)
    [704, 736) 'ref.tmp133' (line 2364)
    [768, 772) 'argIndex' (line 2373)
    [784, 800) 'argv' (line 2378)
    [816, 848) 'ref.tmp182' (line 2382)
    [880, 888) 'ref.tmp200' (line 2388)
    [912, 944) 'ref.tmp237' (line 2397)
    [976, 984) 'semaphore' (line 2402)        <== Memory access at offset 976 is inside this variable
HINT: this may be a false positive if your program uses some custom stack unwind mechanism, swapcontext or vfork
      (longjmp and C++ exceptions *are* supported)
SUMMARY: AddressSanitizer: stack-use-after-scope /home/cc-runs/src/qt/qt5/qtbase/src/corelib/text/qstringconverter.cpp:543:27 in QUtf8::convertFromUnicode(char*, QStringView, QStringConverterBase::State*)
Shadow bytes around the buggy address:
  0x1000310c6840: 00 00 f2 f2 00 00 f2 f2 f8 f8 f8 f2 f2 f2 f2 f2
  0x1000310c6850: f8 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 f2
  0x1000310c6860: f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 00 00 f2
  0x1000310c6870: f2 f2 f2 f2 f8 f8 f8 f8 f2 f2 f2 f2 f8 f2 f8 f8
  0x1000310c6880: f2 f2 f8 f8 f8 f8 f2 f2 f2 f2 f8 f2 f2 f2 f8 f8
=>0x1000310c6890: f8 f8 f2 f2 f2 f2[f8]f3 f3 f3 f3 f3 00 00 00 00
  0x1000310c68a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x1000310c68b0: 00 00 00 00 00 00 00 00 00 00 00 00 f1 f1 f1 f1
  0x1000310c68c0: f8 f8 f2 f2 f8 f8 f2 f2 f8 f8 f2 f2 f8 f8 f2 f2
  0x1000310c68d0: f8 f8 f2 f2 f8 f8 f2 f2 f8 f8 f2 f2 f8 f8 f2 f2
  0x1000310c68e0: f8 f8 f2 f2 f8 f8 f2 f2 00 00 f2 f2 00 00 f2 f2
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
==1793072==ABORTING

        For Gerrit Dashboard: QTBUG-104261
        # Subject Branch Project Status CR V
        416277,2 QStringConverter: fix use-after-free in the stack in the test dev qt/qtbase Status: MERGED +2 0
        416635,2 QStringConverter: fix use-after-free in the stack in the test 6.4 qt/qtbase Status: MERGED +2 0
        416636,1 QStringConverter: fix use-after-free in the stack in the test 6.3 qt/qtbase Status: ABANDONED 0 0

            thiago Thiago Macieira
            jimis Dimitrios Apostolou
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              Created:
              Updated:
              Resolved:

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