From f3ba86973428d7442bf95713890be6185bc40dd0 Mon Sep 17 00:00:00 2001 From: practicalswift Date: Mon, 22 May 2017 13:55:42 +0200 Subject: [PATCH] [tests] Add libFuzzer support. See http://llvm.org/docs/LibFuzzer.html#fuzzer-usage for usage instructions. --- src/test/test_bitcoin_fuzzy.cpp | 50 +++++++++++++++++++++++++-------- 1 file changed, 39 insertions(+), 11 deletions(-) diff --git a/src/test/test_bitcoin_fuzzy.cpp b/src/test/test_bitcoin_fuzzy.cpp index e11e46bb0..1fe9fe903 100644 --- a/src/test/test_bitcoin_fuzzy.cpp +++ b/src/test/test_bitcoin_fuzzy.cpp @@ -48,8 +48,8 @@ enum TEST_ID { TEST_ID_END }; -bool read_stdin(std::vector &data) { - char buffer[1024]; +bool read_stdin(std::vector &data) { + uint8_t buffer[1024]; ssize_t length=0; while((length = read(STDIN_FILENO, buffer, 1024)) > 0) { data.insert(data.end(), buffer, buffer+length); @@ -59,11 +59,7 @@ bool read_stdin(std::vector &data) { return length==0; } -int do_fuzz() -{ - std::vector buffer; - if (!read_stdin(buffer)) return 0; - +int test_one_input(std::vector buffer) { if (buffer.size() < sizeof(uint32_t)) return 0; uint32_t test_id = 0xffffffff; @@ -255,9 +251,32 @@ int do_fuzz() return 0; } +static std::unique_ptr globalVerifyHandle; +void initialize() { + globalVerifyHandle = std::unique_ptr(new ECCVerifyHandle()); +} + +// This function is used by libFuzzer +extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { + test_one_input(std::vector(data, data + size)); + return 0; +} + +// This function is used by libFuzzer +extern "C" int LLVMFuzzerInitialize(int *argc, char ***argv) { + initialize(); + return 0; +} + +// Disabled under WIN32 due to clash with Cygwin's WinMain. +#ifndef WIN32 +// Declare main(...) "weak" to allow for libFuzzer linking. libFuzzer provides +// the main(...) function. +__attribute__((weak)) +#endif int main(int argc, char **argv) { - ECCVerifyHandle globalVerifyHandle; + initialize(); #ifdef __AFL_INIT // Enable AFL deferred forkserver mode. Requires compilation using // afl-clang-fast++. See fuzzing.md for details. @@ -267,11 +286,20 @@ int main(int argc, char **argv) #ifdef __AFL_LOOP // Enable AFL persistent mode. Requires compilation using afl-clang-fast++. // See fuzzing.md for details. + int ret = 0; while (__AFL_LOOP(1000)) { - do_fuzz(); + std::vector buffer; + if (!read_stdin(buffer)) { + continue; + } + ret = test_one_input(buffer); } - return 0; + return ret; #else - return do_fuzz(); + std::vector buffer; + if (!read_stdin(buffer)) { + return 0; + } + return test_one_input(buffer); #endif }