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sandbox: Add support for Address Sanitizer

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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.

The config is not yet enabled for any targets by default.

Signed-off-by: Andrew Scull <ascull@google.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Andrew Scull 2022-05-30 10:00:05 +00:00 committed by Tom Rini
parent 99e2fbcb69
commit 1e578ed20c
2 changed files with 19 additions and 2 deletions
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7
Kconfig
View file

@ -154,6 +154,13 @@ 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)

14
arch/sandbox/config.mk
View file

@ -15,8 +15,16 @@ 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) \
$(KBUILD_LDFLAGS:%=-Wl,%)$(LTO_FINAL_LDFLAGS) \
$(KBUILD_LDFLAGS:%=-Wl,%) \
$(SANITIZERS) \
$(LTO_FINAL_LDFLAGS) \
-Wl,--whole-archive \
$(u-boot-main) \
$(u-boot-keep-syms-lto) \
@ -24,7 +32,9 @@ 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 \
$(KBUILD_LDFLAGS:%=-Wl,%) $(LTO_FINAL_LDFLAGS) \
$(KBUILD_LDFLAGS:%=-Wl,%) \
$(SANITIZERS) \
$(LTO_FINAL_LDFLAGS) \
$(patsubst $(obj)/%,%,$(u-boot-spl-init)) \
-Wl,--whole-archive \
$(patsubst $(obj)/%,%,$(u-boot-spl-main)) \