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authorpracticalswift <practicalswift@users.noreply.github.com>2017-05-18 21:37:31 +0200
committerpracticalswift <practicalswift@users.noreply.github.com>2017-05-19 07:28:46 +0200
commit693247b82bbccada37f7bc61380ddac799100eb8 (patch)
tree3230dc0129a9ad2ef2a8aa472b1edbf8b737932d /src/test
parent95546c859b71bd73ddd33552ac216086a9adf7c9 (diff)
[test] Speed up fuzzing by ~200x when using afl-fuzz
Enable the `afl-clang-fast++` features deferred forkserver (`__AFL_INIT`) and persistent mode (`__AFL_LOOP(1000)`). Before this patch: ``` $ afl-fuzz -i input -o output -m512 -- src/test/test_bitcoin_fuzzy [*] Validating target binary... [!] WARNING: The target binary is pretty slow! See /usr/local/share/doc/afl/perf_tips.txt. [+] Here are some useful stats: Test case count : 1 favored, 0 variable, 1 total Bitmap range : 1072 to 1072 bits (average: 1072.00 bits) Exec timing : 20.4k to 20.4k us (average: 20.4k us) … exec speed : 57.58/sec (slow!) exec speed : 48.35/sec (slow!) exec speed : 53.78/sec (slow!) ``` After this patch: ``` $ afl-fuzz -i input -o output -m512 -- src/test/test_bitcoin_fuzzy [*] Validating target binary... [+] Persistent mode binary detected. [+] Deferred forkserver binary detected. [+] Here are some useful stats: Test case count : 1 favored, 0 variable, 1 total Bitmap range : 24 to 24 bits (average: 24.00 bits) Exec timing : 114 to 114 us (average: 114 us) … exec speed : 15.9k/sec exec speed : 13.1k/sec exec speed : 15.1k/sec ```
Diffstat (limited to 'src/test')
-rw-r--r--src/test/test_bitcoin_fuzzy.cpp23
1 files changed, 21 insertions, 2 deletions
diff --git a/src/test/test_bitcoin_fuzzy.cpp b/src/test/test_bitcoin_fuzzy.cpp
index c4983f6f5c..e11e46bb02 100644
--- a/src/test/test_bitcoin_fuzzy.cpp
+++ b/src/test/test_bitcoin_fuzzy.cpp
@@ -59,9 +59,8 @@ bool read_stdin(std::vector<char> &data) {
return length==0;
}
-int main(int argc, char **argv)
+int do_fuzz()
{
- ECCVerifyHandle globalVerifyHandle;
std::vector<char> buffer;
if (!read_stdin(buffer)) return 0;
@@ -256,3 +255,23 @@ int main(int argc, char **argv)
return 0;
}
+int main(int argc, char **argv)
+{
+ ECCVerifyHandle globalVerifyHandle;
+#ifdef __AFL_INIT
+ // Enable AFL deferred forkserver mode. Requires compilation using
+ // afl-clang-fast++. See fuzzing.md for details.
+ __AFL_INIT();
+#endif
+
+#ifdef __AFL_LOOP
+ // Enable AFL persistent mode. Requires compilation using afl-clang-fast++.
+ // See fuzzing.md for details.
+ while (__AFL_LOOP(1000)) {
+ do_fuzz();
+ }
+ return 0;
+#else
+ return do_fuzz();
+#endif
+}