samples/bpf: Add -fsanitize=bounds to userspace programs

The sanitizer flag, which is supported by both clang and gcc, would make it easier to debug array index out-of-bounds problems in these programs. Make the Makfile smarter to detect ubsan support from the compiler and add the '-fsanitize=bounds' accordingly. Suggested-by: Mimi Zohar <[email protected]> Signed-off-by: Jinghao Jia <[email protected]> Signed-off-by: Jinghao Jia <[email protected]> Signed-off-by: Ruowen Qin <[email protected]> Signed-off-by: Andrii Nakryiko <[email protected]> Tested-by: Jiri Olsa <[email protected]> Acked-by: Jiri Olsa <[email protected]> Link: https://lore.kernel.org/bpf/[email protected]
wafgo · Sep 28, 2023 · 9e09b75 · 9e09b75
1 parent 0e73ef1
commit 9e09b75
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
@@ -169,6 +169,9 @@ endif
 TPROGS_CFLAGS += -Wall -O2
 TPROGS_CFLAGS += -Wmissing-prototypes
 TPROGS_CFLAGS += -Wstrict-prototypes
+TPROGS_CFLAGS += $(call try-run,\
+	printf "int main() { return 0; }" |\
+	$(CC) -Werror -fsanitize=bounds -x c - -o "$$TMP",-fsanitize=bounds,)
 
 TPROGS_CFLAGS += -I$(objtree)/usr/include
 TPROGS_CFLAGS += -I$(srctree)/tools/testing/selftests/bpf/