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Add libfuzzer support.

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This commit is contained in:
Nick Mathewson 2016-12-19 15:17:42 -05:00
parent b1567cf500
commit eb414a08a9
5 changed files with 136 additions and 21 deletions
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1
.gitignore vendored
View File

@ -198,6 +198,7 @@ uptime-*.json
# /src/test/fuzz
/src/test/fuzz/fuzz-*
/src/test/fuzz/lf-fuzz-*
# /src/tools/
/src/tools/tor-checkkey

4
Makefile.am
View File

@ -55,6 +55,10 @@ TEST_CPPFLAGS=-DTOR_UNIT_TESTS
TEST_NETWORK_FLAGS=--hs-multi-client 1
endif
if LIBFUZZER_ENABLED
TEST_CFLAGS += -fsanitize-coverage=edge -fsanitize-coverage=trace-cmp
endif
TEST_NETWORK_ALL_LOG_DIR=$(top_builddir)/test_network_log
TEST_NETWORK_ALL_DRIVER_FLAGS=--color-tests yes

6
configure.ac
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@ -49,6 +49,8 @@ AC_ARG_ENABLE(asserts-in-tests,
AS_HELP_STRING(--disable-asserts-in-tests, [disable tor_assert() calls in the unit tests, for branch coverage]))
AC_ARG_ENABLE(system-torrc,
AS_HELP_STRING(--disable-system-torrc, [don't look for a system-wide torrc file]))
AC_ARG_ENABLE(libfuzzer,
AS_HELP_STRING(--libfuzzer, [build extra fuzzers based on 'libfuzzer']))
if test "x$enable_coverage" != "xyes" -a "x$enable_asserts_in_tests" = "xno" ; then
AC_MSG_ERROR([Can't disable assertions outside of coverage build])
@ -57,6 +59,7 @@ fi
AM_CONDITIONAL(UNITTESTS_ENABLED, test "x$enable_unittests" != "xno")
AM_CONDITIONAL(COVERAGE_ENABLED, test "x$enable_coverage" = "xyes")
AM_CONDITIONAL(DISABLE_ASSERTS_IN_UNIT_TESTS, test "x$enable_asserts_in_tests" = "xno")
AM_CONDITIONAL(LIBFUZZER_ENABLED, test "x$enable_libfuzzer" = "xyes")
if test "$enable_static_tor" = "yes"; then
enable_static_libevent="yes";
@ -735,6 +738,7 @@ CFLAGS_FWRAPV=
CFLAGS_ASAN=
CFLAGS_UBSAN=
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([], [
#if !defined(__clang__)
#error
@ -758,7 +762,7 @@ m4_ifdef([AS_VAR_IF],[
AS_VAR_POPDEF([can_compile])
TOR_CHECK_CFLAGS(-Wstack-protector)
TOR_CHECK_CFLAGS(--param ssp-buffer-size=1)
if test "$bwin32" = "false"; then
if test "$bwin32" = "false" && test "$enable_libfuzzer" != "yes"; then
TOR_CHECK_CFLAGS(-fPIE)
TOR_CHECK_LDFLAGS(-pie, "$all_ldflags_for_check", "$all_libs_for_check")
fi

45
src/test/fuzz/fuzzing_common.c
View File

@ -92,14 +92,38 @@ disable_signature_checking(void)
MOCK(ed25519_impl_spot_check, mock_ed25519_impl_spot_check__nocheck);
}
static void
global_init(void)
{
tor_threads_init();
{
struct sipkey sipkey = { 1337, 7331 };
siphash_set_global_key(&sipkey);
}
/* Initialise logging first */
init_logging(1);
configure_backtrace_handler(get_version());
/* set up the options. */
mock_options = tor_malloc(sizeof(or_options_t));
MOCK(get_options, mock_get_options);
/* Make BUG() and nonfatal asserts crash */
tor_set_failed_assertion_callback(abort);
}
#ifdef LLVM_FUZZ
int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size);
int
LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size)
{
static int initialized = 0;
if (!initialized) {
global_init();
if (fuzz_init() < 0)
abort();
initialized = 1;
}
return fuzz_main(Data, Size);
@ -112,23 +136,11 @@ main(int argc, char **argv)
{
size_t size;
tor_threads_init();
{
struct sipkey sipkey = { 1337, 7331 };
siphash_set_global_key(&sipkey);
}
global_init();
/* Disable logging by default to speed up fuzzing. */
int loglevel = LOG_ERR;
/* Initialise logging first */
init_logging(1);
configure_backtrace_handler(get_version());
/* set up the options. */
mock_options = tor_malloc(sizeof(or_options_t));
MOCK(get_options, mock_get_options);
for (int i = 1; i < argc; ++i) {
if (!strcmp(argv[i], "--warn")) {
loglevel = LOG_WARN;
@ -150,9 +162,6 @@ main(int argc, char **argv)
add_stream_log(&s, "", fileno(stdout));
}
/* Make BUG() and nonfatal asserts crash */
tor_set_failed_assertion_callback(abort);
if (fuzz_init() < 0)
abort();
@ -164,8 +173,10 @@ main(int argc, char **argv)
#define MAX_FUZZ_SIZE (128*1024)
char *input = read_file_to_str_until_eof(0, MAX_FUZZ_SIZE, &size);
tor_assert(input);
fuzz_main((const uint8_t*)input, size);
char *raw = tor_memdup(input, size); /* Because input is nul-terminated */
tor_free(input);
fuzz_main((const uint8_t*)raw, size);
tor_free(raw);
if (fuzz_cleanup() < 0)
abort();

101
src/test/fuzz/include.am
View File

@ -23,6 +23,14 @@ FUZZING_LIBS = \
noinst_HEADERS += \
src/test/fuzz/fuzzing.h
src_test_fuzz_fuzz_consensus_SOURCES = \
src/test/fuzz/fuzzing_common.c \
src/test/fuzz/fuzz_consensus.c
src_test_fuzz_fuzz_consensus_CPPFLAGS = $(FUZZING_CPPFLAGS)
src_test_fuzz_fuzz_consensus_CFLAGS = $(FUZZING_CFLAGS)
src_test_fuzz_fuzz_consensus_LDFLAGS = $(FUZZING_LDFLAG)
src_test_fuzz_fuzz_consensus_LDADD = $(FUZZING_LIBS)
src_test_fuzz_fuzz_descriptor_SOURCES = \
src/test/fuzz/fuzzing_common.c \
src/test/fuzz/fuzz_descriptor.c
@ -39,6 +47,22 @@ src_test_fuzz_fuzz_http_CFLAGS = $(FUZZING_CFLAGS)
src_test_fuzz_fuzz_http_LDFLAGS = $(FUZZING_LDFLAG)
src_test_fuzz_fuzz_http_LDADD = $(FUZZING_LIBS)
src_test_fuzz_fuzz_hsdescv2_SOURCES = \
src/test/fuzz/fuzzing_common.c \
src/test/fuzz/fuzz_hsdescv2.c
src_test_fuzz_fuzz_hsdescv2_CPPFLAGS = $(FUZZING_CPPFLAGS)
src_test_fuzz_fuzz_hsdescv2_CFLAGS = $(FUZZING_CFLAGS)
src_test_fuzz_fuzz_hsdescv2_LDFLAGS = $(FUZZING_LDFLAG)
src_test_fuzz_fuzz_hsdescv2_LDADD = $(FUZZING_LIBS)
src_test_fuzz_fuzz_iptsv2_SOURCES = \
src/test/fuzz/fuzzing_common.c \
src/test/fuzz/fuzz_iptsv2.c
src_test_fuzz_fuzz_iptsv2_CPPFLAGS = $(FUZZING_CPPFLAGS)
src_test_fuzz_fuzz_iptsv2_CFLAGS = $(FUZZING_CFLAGS)
src_test_fuzz_fuzz_iptsv2_LDFLAGS = $(FUZZING_LDFLAG)
src_test_fuzz_fuzz_iptsv2_LDADD = $(FUZZING_LIBS)
src_test_fuzz_fuzz_extrainfo_SOURCES = \
src/test/fuzz/fuzzing_common.c \
src/test/fuzz/fuzz_extrainfo.c
@ -56,13 +80,84 @@ src_test_fuzz_fuzz_microdesc_LDFLAGS = $(FUZZING_LDFLAG)
src_test_fuzz_fuzz_microdesc_LDADD = $(FUZZING_LIBS)
FUZZERS = \
src/test/fuzz/fuzz-consensus \
src/test/fuzz/fuzz-descriptor \
src/test/fuzz/fuzz-extrainfo \
src/test/fuzz/fuzz-http \
src/test/fuzz/fuzz-hsdescv2 \
src/test/fuzz/fuzz-iptsv2 \
src/test/fuzz/fuzz-microdesc
noinst_PROGRAMS += $(FUZZERS)
fuzzers: $(FUZZERS)
LIBFUZZER = /home/nickm/build/libfuzz/libFuzzer.a
LIBFUZZER_CPPFLAGS = $(FUZZING_CPPFLAGS) -DLLVM_FUZZ
LIBFUZZER_CFLAGS = $(FUZZING_CFLAGS)
LIBFUZZER_LDFLAG = $(FUZZING_LDFLAG)
LIBFUZZER_LIBS = $(FUZZING_LIBS) $(LIBFUZZER) -lstdc++
if LIBFUZZER_ENABLED
src_test_fuzz_lf_fuzz_consensus_SOURCES = \
$(src_test_fuzz_fuzz_consensus_SOURCES)
src_test_fuzz_lf_fuzz_consensus_CPPFLAGS = $(LIBFUZZER_CPPFLAGS)
src_test_fuzz_lf_fuzz_consensus_CFLAGS = $(LIBFUZZER_CFLAGS)
src_test_fuzz_lf_fuzz_consensus_LDFLAGS = $(LIBFUZZER_LDFLAG)
src_test_fuzz_lf_fuzz_consensus_LDADD = $(LIBFUZZER_LIBS)
src_test_fuzz_lf_fuzz_descriptor_SOURCES = \
$(src_test_fuzz_fuzz_descriptor_SOURCES)
src_test_fuzz_lf_fuzz_descriptor_CPPFLAGS = $(LIBFUZZER_CPPFLAGS)
src_test_fuzz_lf_fuzz_descriptor_CFLAGS = $(LIBFUZZER_CFLAGS)
src_test_fuzz_lf_fuzz_descriptor_LDFLAGS = $(LIBFUZZER_LDFLAG)
src_test_fuzz_lf_fuzz_descriptor_LDADD = $(LIBFUZZER_LIBS)
src_test_fuzz_lf_fuzz_extrainfo_SOURCES = \
$(src_test_fuzz_fuzz_extrainfo_SOURCES)
src_test_fuzz_lf_fuzz_extrainfo_CPPFLAGS = $(LIBFUZZER_CPPFLAGS)
src_test_fuzz_lf_fuzz_extrainfo_CFLAGS = $(LIBFUZZER_CFLAGS)
src_test_fuzz_lf_fuzz_extrainfo_LDFLAGS = $(LIBFUZZER_LDFLAG)
src_test_fuzz_lf_fuzz_extrainfo_LDADD = $(LIBFUZZER_LIBS)
src_test_fuzz_lf_fuzz_http_SOURCES = \
$(src_test_fuzz_fuzz_http_SOURCES)
src_test_fuzz_lf_fuzz_http_CPPFLAGS = $(LIBFUZZER_CPPFLAGS)
src_test_fuzz_lf_fuzz_http_CFLAGS = $(LIBFUZZER_CFLAGS)
src_test_fuzz_lf_fuzz_http_LDFLAGS = $(LIBFUZZER_LDFLAG)
src_test_fuzz_lf_fuzz_http_LDADD = $(LIBFUZZER_LIBS)
src_test_fuzz_lf_fuzz_hsdescv2_SOURCES = \
$(src_test_fuzz_fuzz_hsdescv2_SOURCES)
src_test_fuzz_lf_fuzz_hsdescv2_CPPFLAGS = $(LIBFUZZER_CPPFLAGS)
src_test_fuzz_lf_fuzz_hsdescv2_CFLAGS = $(LIBFUZZER_CFLAGS)
src_test_fuzz_lf_fuzz_hsdescv2_LDFLAGS = $(LIBFUZZER_LDFLAG)
src_test_fuzz_lf_fuzz_hsdescv2_LDADD = $(LIBFUZZER_LIBS)
src_test_fuzz_lf_fuzz_iptsv2_SOURCES = \
$(src_test_fuzz_fuzz_iptsv2_SOURCES)
src_test_fuzz_lf_fuzz_iptsv2_CPPFLAGS = $(LIBFUZZER_CPPFLAGS)
src_test_fuzz_lf_fuzz_iptsv2_CFLAGS = $(LIBFUZZER_CFLAGS)
src_test_fuzz_lf_fuzz_iptsv2_LDFLAGS = $(LIBFUZZER_LDFLAG)
src_test_fuzz_lf_fuzz_iptsv2_LDADD = $(LIBFUZZER_LIBS)
src_test_fuzz_lf_fuzz_microdesc_SOURCES = \
$(src_test_fuzz_fuzz_microdesc_SOURCES)
src_test_fuzz_lf_fuzz_microdesc_CPPFLAGS = $(LIBFUZZER_CPPFLAGS)
src_test_fuzz_lf_fuzz_microdesc_CFLAGS = $(LIBFUZZER_CFLAGS)
src_test_fuzz_lf_fuzz_microdesc_LDFLAGS = $(LIBFUZZER_LDFLAG)
src_test_fuzz_lf_fuzz_microdesc_LDADD = $(LIBFUZZER_LIBS)
LIBFUZZER_FUZZERS = \
src/test/fuzz/lf-fuzz-consensus \
src/test/fuzz/lf-fuzz-descriptor \
src/test/fuzz/lf-fuzz-extrainfo \
src/test/fuzz/lf-fuzz-http \
src/test/fuzz/lf-fuzz-hsdescv2 \
src/test/fuzz/lf-fuzz-iptsv2 \
src/test/fuzz/lf-fuzz-microdesc
else
LIBFUZZER_FUZZERS =
endif
noinst_PROGRAMS += $(FUZZERS) $(LIBFUZZER_FUZZERS)
fuzzers: $(FUZZERS) $(LIBFUZZER_FUZZERS)