[PATCH bpf-next 2/6] selftests/bpf: add test_progs-asan flavor with AddressSantizer

[Andrii Nakryiko <andriin@fb.com>]

Add another flavor of test_progs that is compiled and run with
AddressSanitizer and LeakSanitizer. This allows to find potential memory
correction bugs and memory leaks. Due to sometimes not trivial requirements on
the environment, this is (for now) done as a separate flavor, not by default.
Eventually I hope to enable it by default.

To run ./test_progs-asan successfully, you need to have libasan installed in
the system, where version of the package depends on GCC version you have.
E.g., GCC8 needs libasan5, while GCC7 uses libasan4.

For CentOS 7, to build everything successfully one would need to:
  $ sudo yum install devtoolset-8-gcc devtoolset-libasan-devel

For Arch Linux to run selftests, one would need to install gcc-libs package to
get libasan.so.5:
  $ sudo pacman -S gcc-libs

Cc: Julia Kartseva <hex@fb.com>
Signed-off-by: Andrii Nakryiko <andriin@fb.com>
---
 tools/testing/selftests/bpf/.gitignore |  1 +
 tools/testing/selftests/bpf/Makefile   | 16 +++++++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/.gitignore b/tools/testing/selftests/bpf/.gitignore
index c30079c86998..69b545ca51b8 100644
--- a/tools/testing/selftests/bpf/.gitignore
+++ b/tools/testing/selftests/bpf/.gitignore
@@ -36,6 +36,7 @@ test_current_pid_tgid_new_ns
 xdping
 test_cpp
 *.skel.h
+/asan
 /no_alu32
 /bpf_gcc
 /tools
diff --git a/tools/testing/selftests/bpf/Makefile b/tools/testing/selftests/bpf/Makefile
index fd56e31a5b4f..e54d069b27a6 100644
--- a/tools/testing/selftests/bpf/Makefile
+++ b/tools/testing/selftests/bpf/Makefile
@@ -33,7 +33,7 @@ TEST_GEN_PROGS = test_verifier test_tag test_maps test_lru_map test_lpm_map test
 	test_sock test_btf test_sockmap get_cgroup_id_user test_socket_cookie \
 	test_cgroup_storage \
 	test_netcnt test_tcpnotify_user test_sock_fields test_sysctl test_hashmap \
-	test_progs-no_alu32 \
+	test_progs-no_alu32 test_progs-asan \
 	test_current_pid_tgid_new_ns
 
 # Also test bpf-gcc, if present
@@ -344,7 +344,8 @@ $(OUTPUT)/$(TRUNNER_BINARY): $(TRUNNER_TEST_OBJS)			\
 			     $(TRUNNER_EXTRA_OBJS) $$(BPFOBJ)		\
 			     | $(TRUNNER_BINARY)-extras
 	$$(call msg,BINARY,,$$@)
-	$$(CC) $$(CFLAGS) $$(filter %.a %.o,$$^) $$(LDLIBS) -o $$@
+	$$(CC) $$(CFLAGS) $(TRUNNER_SAN_CFLAGS) $$(filter %.a %.o,$$^)	\
+	       $$(LDLIBS) -o $$@
 
 endef
 
@@ -358,11 +359,18 @@ TRUNNER_EXTRA_FILES := $(OUTPUT)/urandom_read				\
 TRUNNER_BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
 TRUNNER_BPF_CFLAGS := $(BPF_CFLAGS) $(CLANG_CFLAGS)
 TRUNNER_BPF_LDFLAGS := -mattr=+alu32
+TRUNNER_SAN_CFLAGS :=
 $(eval $(call DEFINE_TEST_RUNNER,test_progs))
 
+# Define test_progs-asan test runner.
+TRUNNER_BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
+TRUNNER_SAN_CFLAGS := -fsanitize=address
+$(eval $(call DEFINE_TEST_RUNNER,test_progs,asan))
+
 # Define test_progs-no_alu32 test runner.
 TRUNNER_BPF_BUILD_RULE := CLANG_NOALU32_BPF_BUILD_RULE
 TRUNNER_BPF_LDFLAGS :=
+TRUNNER_SAN_CFLAGS :=
 $(eval $(call DEFINE_TEST_RUNNER,test_progs,no_alu32))
 
 # Define test_progs BPF-GCC-flavored test runner.
@@ -370,6 +378,7 @@ ifneq ($(BPF_GCC),)
 TRUNNER_BPF_BUILD_RULE := GCC_BPF_BUILD_RULE
 TRUNNER_BPF_CFLAGS := $(BPF_CFLAGS) $(call get_sys_includes,gcc)
 TRUNNER_BPF_LDFLAGS :=
+TRUNNER_SAN_CFLAGS :=
 $(eval $(call DEFINE_TEST_RUNNER,test_progs,bpf_gcc))
 endif
 
@@ -381,6 +390,7 @@ TRUNNER_EXTRA_FILES :=
 TRUNNER_BPF_BUILD_RULE := $$(error no BPF objects should be built)
 TRUNNER_BPF_CFLAGS :=
 TRUNNER_BPF_LDFLAGS :=
+TRUNNER_SAN_CFLAGS :=
 $(eval $(call DEFINE_TEST_RUNNER,test_maps))
 
 # Define test_verifier test runner.
@@ -406,4 +416,4 @@ $(OUTPUT)/test_cpp: test_cpp.cpp $(OUTPUT)/test_core_extern.skel.h $(BPFOBJ)
 EXTRA_CLEAN := $(TEST_CUSTOM_PROGS) $(SCRATCH_DIR)			\
 	prog_tests/tests.h map_tests/tests.h verifier/tests.h		\
 	feature								\
-	$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32 bpf_gcc)
+	$(addprefix $(OUTPUT)/,*.o *.skel.h asan no_alu32 bpf_gcc)
-- 
2.24.1