On 8/11/14, Florian Weimer <fweimer@xxxxxxxxxx> wrote: > On 08/08/2014 01:15 PM, William Brana wrote: >> Hello, >> I'm getting warnings like following from valgrind when libXcursor is >> compiled with -O2 -finline-functions and gcc 4.8.3 or 4.7.4, but not >> with -O2. >> Is it miscompiled or false positive? > > Can you run valgrind with debugging information? It might us tell us at > least which allocation is too short. > > It could be a harmless over-read from the libc string functions > (particularly if valgrind has not been set up correctly on your system). > > -- > Florian Weimer / Red Hat Product Security > gcc 4.8, libXcursor 1.1.14 >From Qt application: ==43000== Invalid read of size 4 ==43000== at 0x89019F3: XcursorScanTheme.part.0 (library.c:137) ==43000== by 0x8901E96: XcursorLibraryLoadImages (library.c:315) ==43000== by 0x8901F41: XcursorLibraryLoadCursor (library.c:322) ==43000== by 0x50A2A3F: QCursorData::update() (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x50A31B6: QCursor::handle() const (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x50B1300: qt_x11_enforce_cursor(QWidget*) (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x50B6EC7: QWidgetPrivate::create_sys(unsigned long, bool, bool) (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x505BC97: QWidget::create(unsigned long, bool, bool) (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x509E3E2: setupOwner() (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x509E719: QClipboard::QClipboard(QObject*) (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x4FFFA93: QApplication::clipboard() (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x52ADF24: QTextControl::canPaste() const (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== Address 0xd4d6ed0 is 32 bytes inside a block of size 35 alloc'd ==43000== at 0x4C2984F: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==43000== by 0x8901492: XcursorScanTheme.part.0 (library.c:117) ==43000== by 0x8901E96: XcursorLibraryLoadImages (library.c:315) ==43000== by 0x8901F41: XcursorLibraryLoadCursor (library.c:322) ==43000== by 0x50A2A3F: QCursorData::update() (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x50A31B6: QCursor::handle() const (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x50B1300: qt_x11_enforce_cursor(QWidget*) (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x50B6EC7: QWidgetPrivate::create_sys(unsigned long, bool, bool) (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x505BC97: QWidget::create(unsigned long, bool, bool) (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x509E3E2: setupOwner() (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x509E719: QClipboard::QClipboard(QObject*) (in /usr/lib64/qt4/libQtGui.so.4.8.5) ==43000== by 0x4FFFA93: QApplication::clipboard() (in /usr/lib64/qt4/libQtGui.so.4.8.5) >From gtkperf: ==42827== 6 errors in context 1 of 4: ==42827== Invalid read of size 4 ==42827== at 0x88D29F3: XcursorScanTheme.part.0 (library.c:137) ==42827== by 0x88D2E96: XcursorLibraryLoadImages (library.c:315) ==42827== by 0x88D328B: XcursorTryShapeCursor (xlib.c:105) ==42827== by 0x6CBD56E: XCreateGlyphCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x6CBDB2C: XCreateFontCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x581CD54: gdk_cursor_new_for_display (in /usr/lib64/libgdk-x11-2.0.so.0.2400.24) ==42827== by 0x4F2866E: gtk_entry_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5075629: gtk_spin_button_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5F2144E: g_closure_invoke (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F38310: signal_emit_unlocked_R (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3E931: g_signal_emit_valist (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3EBEA: g_signal_emit (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== Address 0xb8afca0 is 32 bytes inside a block of size 35 alloc'd ==42827== at 0x4C2984F: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==42827== by 0x88D2492: XcursorScanTheme.part.0 (library.c:117) ==42827== by 0x88D2E96: XcursorLibraryLoadImages (library.c:315) ==42827== by 0x88D328B: XcursorTryShapeCursor (xlib.c:105) ==42827== by 0x6CBD56E: XCreateGlyphCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x6CBDB2C: XCreateFontCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x581CD54: gdk_cursor_new_for_display (in /usr/lib64/libgdk-x11-2.0.so.0.2400.24) ==42827== by 0x4F2866E: gtk_entry_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5075629: gtk_spin_button_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5F2144E: g_closure_invoke (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F38310: signal_emit_unlocked_R (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3E931: g_signal_emit_valist (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== ==42827== ==42827== 6 errors in context 2 of 4: ==42827== Invalid read of size 4 ==42827== at 0x88D269F: XcursorScanTheme.part.0 (library.c:137) ==42827== by 0x88D2E96: XcursorLibraryLoadImages (library.c:315) ==42827== by 0x88D328B: XcursorTryShapeCursor (xlib.c:105) ==42827== by 0x6CBD56E: XCreateGlyphCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x6CBDB2C: XCreateFontCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x581CD54: gdk_cursor_new_for_display (in /usr/lib64/libgdk-x11-2.0.so.0.2400.24) ==42827== by 0x4F2866E: gtk_entry_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5075629: gtk_spin_button_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5F2144E: g_closure_invoke (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F38310: signal_emit_unlocked_R (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3E931: g_signal_emit_valist (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3EBEA: g_signal_emit (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== Address 0xb8afca0 is 32 bytes inside a block of size 35 alloc'd ==42827== at 0x4C2984F: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==42827== by 0x88D2492: XcursorScanTheme.part.0 (library.c:117) ==42827== by 0x88D2E96: XcursorLibraryLoadImages (library.c:315) ==42827== by 0x88D328B: XcursorTryShapeCursor (xlib.c:105) ==42827== by 0x6CBD56E: XCreateGlyphCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x6CBDB2C: XCreateFontCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x581CD54: gdk_cursor_new_for_display (in /usr/lib64/libgdk-x11-2.0.so.0.2400.24) ==42827== by 0x4F2866E: gtk_entry_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5075629: gtk_spin_button_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5F2144E: g_closure_invoke (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F38310: signal_emit_unlocked_R (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3E931: g_signal_emit_valist (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== ==42827== ==42827== 6 errors in context 3 of 4: ==42827== Invalid read of size 4 ==42827== at 0x88D29DC: XcursorScanTheme.part.0 (library.c:137) ==42827== by 0x88D2E21: XcursorLibraryLoadImages (library.c:229) ==42827== by 0x88D328B: XcursorTryShapeCursor (xlib.c:105) ==42827== by 0x6CBD56E: XCreateGlyphCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x6CBDB2C: XCreateFontCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x581CD54: gdk_cursor_new_for_display (in /usr/lib64/libgdk-x11-2.0.so.0.2400.24) ==42827== by 0x4F2866E: gtk_entry_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5075629: gtk_spin_button_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5F2144E: g_closure_invoke (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F38310: signal_emit_unlocked_R (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3E931: g_signal_emit_valist (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3EBEA: g_signal_emit (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== Address 0xb8aa4f4 is 20 bytes inside a block of size 23 alloc'd ==42827== at 0x4C2984F: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==42827== by 0x88D2492: XcursorScanTheme.part.0 (library.c:117) ==42827== by 0x88D2E21: XcursorLibraryLoadImages (library.c:229) ==42827== by 0x88D328B: XcursorTryShapeCursor (xlib.c:105) ==42827== by 0x6CBD56E: XCreateGlyphCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x6CBDB2C: XCreateFontCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x581CD54: gdk_cursor_new_for_display (in /usr/lib64/libgdk-x11-2.0.so.0.2400.24) ==42827== by 0x4F2866E: gtk_entry_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5075629: gtk_spin_button_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5F2144E: g_closure_invoke (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F38310: signal_emit_unlocked_R (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3E931: g_signal_emit_valist (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== ==42827== ==42827== 6 errors in context 4 of 4: ==42827== Invalid read of size 4 ==42827== at 0x88D268A: XcursorScanTheme.part.0 (library.c:137) ==42827== by 0x88D2E21: XcursorLibraryLoadImages (library.c:229) ==42827== by 0x88D328B: XcursorTryShapeCursor (xlib.c:105) ==42827== by 0x6CBD56E: XCreateGlyphCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x6CBDB2C: XCreateFontCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x581CD54: gdk_cursor_new_for_display (in /usr/lib64/libgdk-x11-2.0.so.0.2400.24) ==42827== by 0x4F2866E: gtk_entry_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5075629: gtk_spin_button_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5F2144E: g_closure_invoke (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F38310: signal_emit_unlocked_R (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3E931: g_signal_emit_valist (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3EBEA: g_signal_emit (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== Address 0xb8aa4f4 is 20 bytes inside a block of size 23 alloc'd ==42827== at 0x4C2984F: malloc (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==42827== by 0x88D2492: XcursorScanTheme.part.0 (library.c:117) ==42827== by 0x88D2E21: XcursorLibraryLoadImages (library.c:229) ==42827== by 0x88D328B: XcursorTryShapeCursor (xlib.c:105) ==42827== by 0x6CBD56E: XCreateGlyphCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x6CBDB2C: XCreateFontCursor (in /usr/lib64/libX11.so.6.3.0) ==42827== by 0x581CD54: gdk_cursor_new_for_display (in /usr/lib64/libgdk-x11-2.0.so.0.2400.24) ==42827== by 0x4F2866E: gtk_entry_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5075629: gtk_spin_button_realize (in /usr/lib64/libgtk-x11-2.0.so.0.2400.24) ==42827== by 0x5F2144E: g_closure_invoke (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F38310: signal_emit_unlocked_R (in /usr/lib64/libgobject-2.0.so.0.4000.0) ==42827== by 0x5F3E931: g_signal_emit_valist (in /usr/lib64/libgobject-2.0.so.0.4000.0)
