[extras] add build support for Google's UndefinedBehaviorSanitizer

Makefile.am

@@ -70,6 +70,7 @@ EXTRA_DIST = \
     extras/ramdisk/ramdisk-create-osx.sh \
     extras/console-qr/console-qr.sh \
     extras/sanitizer/asan-build.sh \
+    extras/sanitizer/ubsan-build.sh \
     fwknop.spec \
     iphone/main.m \
     iphone/Fwknop.xcodeproj \

configure.ac

@@ -179,7 +179,7 @@ dnl
 want_asan_support=no
 AC_ARG_ENABLE([asan-support],
   [AS_HELP_STRING([--enable-asan-support],
-    [Build fwknop binaries with address sanitizer support @<:@default is to disable@:>@])],
+    [Build fwknop binaries with AddressSanitizer support @<:@default is to disable@:>@])],
   [want_asan_support=$enableval],
   [])
 
@@ -187,6 +187,19 @@ if test "x$want_asan_support" = "xyes"; then
     FKO_CHECK_COMPILER_ARG([-fsanitize=address -fno-omit-frame-pointer])
 fi
 
+dnl Decide whether or not to enable MemorySanitizer support
+dnl
+want_ubsan_support=no
+AC_ARG_ENABLE([ubsan-support],
+  [AS_HELP_STRING([--enable-ubsan-support],
+    [Build fwknop binaries with UndefinedBehaviorSanitizer support @<:@default is to disable@:>@])],
+  [want_ubsan_support=$enableval],
+  [])
+
+if test "x$want_ubsan_support" = "xyes"; then
+    FKO_CHECK_COMPILER_ARG([-fsanitize=undefined])
+fi
+
 dnl Decide whether or not force 32-bit mode
 dnl
 want_32bit_mode=no

extras/sanitizer/asan-build.sh

@@ -1,7 +1,7 @@
 #!/bin/sh -x
 
 #
-# In some cases when enabling Google's Address Sanitizer, errors like the
+# In some cases when enabling Google's AddressSanitizer, errors like the
 # following can be generated. This script provides a workaround.
 #
 # fwknop-spa_comm.o: In function `send_spa_packet_http':

extras/sanitizer/ubsan-build.sh

@@ -0,0 +1,15 @@
+#!/bin/sh -x
+#
+# Enabling Google's UndefinedBehaviorSanitizer
+#
+
+if [ -x ./configure ]; then
+    export ac_cv_func_malloc_0_nonnull=yes
+    export ac_cv_func_realloc_0_nonnull=yes
+    ./autogen.sh
+    ./configure --prefix=/usr --sysconfdir=/etc --localstatedir=/run --enable-ubsan-support $@
+    make clean
+    make
+else
+    echo "[*] Execute from the fwknop top level sources directory"
+fi