Travis memsanitizer negative

.travis.yml

@@ -61,10 +61,24 @@ matrix:
           packages:
             - gcc-multilib
             - libgmp-dev:i386
+    # clang with memory sanitizer
+    - compiler: clang
+      # --disable-openssl-tests because openssl uses uninitialized memory. ASM
+      # and BIGNUM are disabled because clang memory sanitizer does not work
+      # with inline assembly (https://clang.llvm.org/docs/MemorySanitizer.html).
+      # The memory sanitizer is instructed to exit with a different exit code
+      # using MSAN_OPTIONS. This is because the default exit code is 77 - the
+      # same exit code that autotools make check interprets as a test that is
+      # supposed to be skipped.
+      env: EXTRAFLAGS="--disable-openssl-tests CFLAGS=-fsanitize=memory" ASM=no BIGNUM=no EXPERIMENTAL=yes ENDOMORPHISM=yes RECOVERY=yes ECDH=yes MSAN_OPTIONS=exitcode=42
+
 before_install: mkdir -p `dirname $GUAVA_JAR`
 install: if [ ! -f $GUAVA_JAR ]; then wget $GUAVA_URL -O $GUAVA_JAR; fi
 before_script: ./autogen.sh
 script:
  - if [ -n "$HOST" ]; then export USE_HOST="--host=$HOST"; fi
  - if [ "x$HOST" = "xi686-linux-gnu" ]; then export CC="$CC -m32"; fi
  - ./configure --enable-experimental=$EXPERIMENTAL --enable-endomorphism=$ENDOMORPHISM --with-field=$FIELD --with-bignum=$BIGNUM --with-scalar=$SCALAR --enable-ecmult-static-precomputation=$STATICPRECOMPUTATION --with-ecmult-gen-precision=$ECMULTGENPRECISION --enable-module-ecdh=$ECDH --enable-module-recovery=$RECOVERY --enable-jni=$JNI $EXTRAFLAGS $USE_HOST && make -j2 $BUILD
+after_script:
+    - cat ./tests.log
+    - cat ./exhaustive_tests.log

src/tests.c

@@ -5167,8 +5167,16 @@ void run_ecdsa_openssl(void) {
 #endif
 
 int main(int argc, char **argv) {
+    unsigned char dummy1[16];
+    unsigned char dummy2[16];
     unsigned char seed16[16] = {0};
     unsigned char run32[32] = {0};
+
+    /* Disable buffering for stdout to improve reliability of getting
+     * diagnostic information. Happens right at the start of main because
+     * setbuf must be used before any other operation on the stream. */
+    setbuf(stdout, NULL);
+
     /* find iteration count */
     if (argc > 1) {
         count = strtol(argv[1], NULL, 0);
@@ -5211,6 +5219,8 @@ int main(int argc, char **argv) {
     printf("test count = %i\n", count);
     printf("random seed = %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", seed16[0], seed16[1], seed16[2], seed16[3], seed16[4], seed16[5], seed16[6], seed16[7], seed16[8], seed16[9], seed16[10], seed16[11], seed16[12], seed16[13], seed16[14], seed16[15]);
 
+    CHECK(memcmp(dummy1, dummy2, sizeof(dummy2)) == 0);
+
     /* initialize */
     run_context_tests(0);
     run_context_tests(1);