Add CONFIG_ASAN to build with the Address Sanitizer. This only works with the sandbox so the config is likewise dependent. The resulting executable will have ASAN instrumentation, including the leak detector that can be disabled with the ASAN_OPTIONS environment variable:
ASAN_OPTIONS=detect_leaks=0 ./u-boot
Since u-boot uses its own dlmalloc, dynamic allocations aren't automatically instrumented, but stack variables and globals are.
Instrumentation could be added to dlmalloc to poison and unpoison memory as it is allocated and deallocated, and to introduce redzones between allocations. Alternatively, the sandbox may be able to play games with the system allocator and somehow still keep the required memory abstraction. No effort to address dynamic allocation is made by this patch.
Signed-off-by: Andrew Scull ascull@google.com --- Kconfig | 7 +++++++ arch/sandbox/config.mk | 8 ++++++++ configs/sandbox_defconfig | 1 + 3 files changed, 16 insertions(+)
diff --git a/Kconfig b/Kconfig index 9dd9ec7f6d..ae7e92611d 100644 --- a/Kconfig +++ b/Kconfig @@ -137,6 +137,13 @@ config CC_COVERAGE Enabling this option will pass "--coverage" to gcc to compile and link code instrumented for coverage analysis.
+config ASAN + bool "Enable AddressSanitizer" + depends on SANDBOX + help + Enables AddressSanitizer to discover out-of-bounds accesses, + use-after-free, double-free and memory leaks. + config CC_HAS_ASM_INLINE def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null)
diff --git a/arch/sandbox/config.mk b/arch/sandbox/config.mk index c42de2ff27..d7ce66fb6c 100644 --- a/arch/sandbox/config.mk +++ b/arch/sandbox/config.mk @@ -15,7 +15,14 @@ PLATFORM_LIBS += $(shell $(SDL_CONFIG) --libs) PLATFORM_CPPFLAGS += $(shell $(SDL_CONFIG) --cflags) endif
+SANITIZERS := +ifdef CONFIG_ASAN +SANITIZERS += -fsanitize=address +endif +KBUILD_CFLAGS += $(SANITIZERS) + cmd_u-boot__ = $(CC) -o $@ -Wl,-T u-boot.lds $(u-boot-init) \ + $(SANITIZERS) \ $(LTO_FINAL_LDFLAGS) \ -Wl,--whole-archive \ $(u-boot-main) \ @@ -24,6 +31,7 @@ cmd_u-boot__ = $(CC) -o $@ -Wl,-T u-boot.lds $(u-boot-init) \ $(PLATFORM_LIBS) -Wl,-Map -Wl,u-boot.map
cmd_u-boot-spl = (cd $(obj) && $(CC) -o $(SPL_BIN) -Wl,-T u-boot-spl.lds \ + $(SANITIZERS) \ $(LTO_FINAL_LDFLAGS) \ $(patsubst $(obj)/%,%,$(u-boot-spl-init)) \ -Wl,--whole-archive \ diff --git a/configs/sandbox_defconfig b/configs/sandbox_defconfig index 7ebeb89264..4862af07cd 100644 --- a/configs/sandbox_defconfig +++ b/configs/sandbox_defconfig @@ -1,3 +1,4 @@ +CONFIG_ASAN=y CONFIG_SYS_TEXT_BASE=0 CONFIG_SYS_MALLOC_LEN=0x2000000 CONFIG_NR_DRAM_BANKS=1