[PATCH 0/6] tests/fuzz: Review notes

[Philippe Mathieu-Daudé]

I took some code notes while testing Alex's toy.
Sending them as patches.

Alex, I had theses issues while building following
docs/devel/fuzzing.txt:

    CC      nbd/server.o
  nbd/server.c:1937:1: error: unused function 
'glib_listautoptr_cleanup_NBDExtentArray' [-Werror,-Wunused-function]
  G_DEFINE_AUTOPTR_CLEANUP_FUNC(NBDExtentArray, nbd_extent_array_free);
  ^
  /usr/include/glib-2.0/glib/gmacros.h:462:22: note: expanded from macro 
'G_DEFINE_AUTOPTR_CLEANUP_FUNC'
    static inline void _GLIB_AUTOPTR_LIST_FUNC_NAME(TypeName) (GList **_l) { 
g_list_free_full (*_l, (GDestroyNotify) func); } \
                       ^
  /usr/include/glib-2.0/glib/gmacros.h:443:48: note: expanded from macro 
'_GLIB_AUTOPTR_LIST_FUNC_NAME'
  #define _GLIB_AUTOPTR_LIST_FUNC_NAME(TypeName) 
glib_listautoptr_cleanup_##TypeName
                                                 ^
Solved by using './configure ... --extra-cflags=-Wno-unused-function'

    LINK    i386-softmmu/qemu-fuzz-i386
  
/usr/lib64/clang/9.0.1/lib/linux/libclang_rt.asan-aarch64.a(asan_interceptors_vfork.S.o):
 warning: common of `__interception::real_vfork' overridden by definition
  
/usr/lib64/clang/9.0.1/lib/linux/libclang_rt.asan-aarch64.a(asan_interceptors.cc.o):
 warning: defined here

I simply ignore this warning.

Alex, could you provide few more examples (in particular about
instantiating devices, or useful libfuzzer arguments)?

Also, I suppose you are using a script to generate the bug reports:

  I can reproduce it in qemu 5.0 using:

  cat << EOF | qemu-system ...
  outl 0xcf8 ...
  outl 0xcfc ...
  ...
  EOF

Is this script available in the QEMU repository? I couldn't find it.

Regards,

Phil.

Philippe Mathieu-Daudé (6):
  tests/fuzz/Makefile: Do not link code using unavailable devices
  Makefile: List fuzz targets in 'make help'
  tests/fuzz: Add missing space in test description
  tests/fuzz: Remove unuseful/unused typedefs
  tests/fuzz: Extract pciconfig_fuzz_qos() method
  tests/fuzz: Extract ioport_fuzz_qtest() method

 Makefile                          |  6 +++-
 tests/qtest/fuzz/i440fx_fuzz.c    | 47 ++++++++++++++++++++-----------
 tests/qtest/fuzz/Makefile.include |  6 ++--
 3 files changed, 38 insertions(+), 21 deletions(-)

-- 
2.21.3