ci: run the tests under ASan/UBsan on GHActions

It was tested in https://github.com/SELinuxProject/selinux/pull/321 and
https://github.com/SELinuxProject/selinux/pull/320. In the process
it discovered a few issues all of which were fixed in
b98d3c4c53
ea539017fb
fe01a91a79
f95dbf2c74

Now that all the issues are gone it should be safe to turn it on
to make it easier to automatically catch bugs like that almost as soon as
they end up in the repository.

Signed-off-by: Evgeny Vereshchagin <evvers@ya.ru>

.github/workflows/run_tests.yml

@@ -29,6 +29,9 @@ jobs:
             python-ruby-version: {python: 3.9, ruby: 2.7, other: linker-bfd}
           - compiler: clang
             python-ruby-version: {python: 3.9, ruby: 2.7, other: linker-gold}
+        include:
+          - compiler: gcc
+            python-ruby-version: {python: 3.9, ruby: 2.7, other: sanitizers}
 
     steps:
     - uses: actions/checkout@v2
@@ -88,6 +91,11 @@ jobs:
         elif [ "${{ matrix.python-ruby-version.other }}" = "test-debug" ] ; then
             # Test hat debug build works fine
             EXPLICIT_MAKE_VARS="DEBUG=1"
+        elif [ "${{ matrix.python-ruby-version.other }}" = "sanitizers" ] ; then
+            sanitizers='-fsanitize=address,undefined'
+            EXPLICIT_MAKE_VARS="CFLAGS='-g -I$DESTDIR/usr/include $sanitizers' LDFLAGS='-L$DESTDIR/usr/lib $sanitizers' LDLIBS= CPPFLAGS= OPT_SUBDIRS="
+            echo "ASAN_OPTIONS=strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1" >> $GITHUB_ENV
+            echo "UBSAN_OPTIONS=print_stacktrace=1:print_summary=1:halt_on_error=1" >> $GITHUB_ENV
         else
             EXPLICIT_MAKE_VARS=
         fi
@@ -139,18 +147,18 @@ jobs:
     - name: Run tests
       run: |
         echo "::group::make install"
-        make -j$(nproc) install $EXPLICIT_MAKE_VARS -k
+        eval make -j$(nproc) install $EXPLICIT_MAKE_VARS -k
         echo "::endgroup::"
         echo "::group::make install-pywrap"
-        make -j$(nproc) install-pywrap $EXPLICIT_MAKE_VARS -k
+        eval make -j$(nproc) install-pywrap $EXPLICIT_MAKE_VARS -k
         echo "::endgroup::"
         echo "::group::make install-rubywrap"
-        make -j$(nproc) install-rubywrap $EXPLICIT_MAKE_VARS -k
+        eval make -j$(nproc) install-rubywrap $EXPLICIT_MAKE_VARS -k
         echo "::endgroup::"
 
         # Now that everything is installed, run "make all" to build everything which may have not been built
         echo "::group::make all"
-        make -j$(nproc) all $EXPLICIT_MAKE_VARS -k
+        eval make -j$(nproc) all $EXPLICIT_MAKE_VARS -k
         echo "::endgroup::"
 
         # Set up environment variables for the tests and show variables (to help debugging issues)
@@ -164,9 +172,10 @@ jobs:
 
         # Run tests
         echo "::group::make test"
-        make test $EXPLICIT_MAKE_VARS
+        eval make test $EXPLICIT_MAKE_VARS
         echo "::endgroup::"
 
+        if [ "${{ matrix.python-ruby-version.other }}" != "sanitizers" ] ; then
             # Test Python and Ruby wrappers
             echo "::group::Test Python and Ruby wrappers"
             $PYTHON -c 'import selinux;import selinux.audit2why;import semanage;print(selinux.is_selinux_enabled())'
@@ -177,6 +186,7 @@ jobs:
             echo "::group::scripts/run-flake8"
             ./scripts/run-flake8
             echo "::endgroup::"
+        fi
 
         echo "::group::Test .gitignore and make clean distclean"
         # Remove every installed files
@@ -184,6 +194,6 @@ jobs:
         # Test that "git status" looks clean, or print a clear error message
         git status --short | sed -n 's/^??/error: missing .gitignore entry for/p' | (! grep '^')
         # Clean up everything and show which file needs to be added to "make clean"
-        make clean distclean $EXPLICIT_MAKE_VARS
+        eval make clean distclean $EXPLICIT_MAKE_VARS
         git ls-files --ignored --others --exclude-standard | sed 's/^/error: "make clean distclean" did not remove /' | (! grep '^')
         echo "::endgroup::"

libsepol/tests/Makefile

@@ -1,3 +1,4 @@
+ENV ?= env
 M4 ?= m4
 MKDIR ?= mkdir
 EXE ?= libsepol-tests
@@ -45,9 +46,14 @@ clean:
 	rm -f $(policies)
 	rm -f policies/test-downgrade/policy.hi policies/test-downgrade/policy.lo
 
-
+# mkdir is run in a clean environment created by env -i to avoid failing under ASan with:
+#
+#   ASan runtime does not come first in initial library list;
+#   you should either link runtime to your application or manually preload it with LD_PRELOAD
+#
+# when the source code is built with ASan
 test: $(EXE) $(policies)
-	$(MKDIR) -p policies/test-downgrade
+	$(ENV) -i $(MKDIR) -p policies/test-downgrade
 	../../checkpolicy/checkpolicy -M policies/test-cond/refpolicy-base.conf -o policies/test-downgrade/policy.hi	
 	./$(EXE)