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Add minimal-runtime support for integer overflows. 

Adds Make support for -fsanitze-minimal-runtime when using
the integer overflow sanitizers. This makes the crashes due to these
sanitizers less mysterious. This also cleans up the handling of the
integer_overflow flag.

Bug: 64091660
Test: Compiled and checked the generated compiler commands
Test: Checked program that overflows for the abort reason
Test: Checked integer_overflow flag still emits overflow checks

Change-Id: I11012ed0cbbf51935f549a08bd17109b5ce6f330
This commit is contained in:
Ivan Lozano 2018-02-21 13:41:05 -08:00
parent 5c93279fbe
commit 911cb99bc1
1 changed files with 25 additions and 6 deletions
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31
core/config_sanitizers.mk
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@ -217,19 +217,17 @@ ifneq ($(filter integer_overflow,$(my_sanitize)),)
# Respect LOCAL_NOSANITIZE for integer-overflow flags.
ifeq ($(filter signed-integer-overflow, $(strip $(LOCAL_NOSANITIZE))),)
my_cflags += -fsanitize=signed-integer-overflow
my_sanitize += signed-integer-overflow
endif
ifeq ($(filter unsigned-integer-overflow, $(strip $(LOCAL_NOSANITIZE))),)
my_cflags += -fsanitize=unsigned-integer-overflow
my_sanitize += unsigned-integer-overflow
endif
my_cflags += -fsanitize-trap=all
my_cflags += -ftrap-function=abort
my_cflags += $(INTEGER_OVERFLOW_EXTRA_CFLAGS)
# Check for diagnostics mode (on by default).
ifneq ($(filter integer_overflow,$(my_sanitize_diag)),)
my_cflags += -fno-sanitize-trap=signed-integer-overflow,unsigned-integer-overflow
my_shared_libraries := $($(LOCAL_2ND_ARCH_VAR_PREFIX)UBSAN_RUNTIME_LIBRARY) $(my_shared_libraries)
my_sanitize_diag += signed-integer-overflow
my_sanitize_diag += unsigned-integer-overflow
endif
endif
endif
@ -326,6 +324,27 @@ ifneq ($(filter address,$(my_sanitize)),)
endif
endif
# Use minimal diagnostics when integer overflow is enabled
ifndef LOCAL_IS_HOST_MODULE
# Pre-emptively add UBSAN minimal runtime incase a static library dependency requires it
ifeq ($(filter STATIC_LIBRARIES,$(LOCAL_MODULE_CLASS)),)
ifndef LOCAL_SDK_VERSION
my_static_libraries += $($(LOCAL_2ND_ARCH_VAR_PREFIX)UBSAN_MINIMAL_RUNTIME_LIBRARY)
endif
endif
ifneq ($(filter unsigned-integer-overflow signed-integer-overflow integer,$(my_sanitize)),)
ifeq ($(filter unsigned-integer-overflow signed-integer overflow integer,$(my_sanitize_diag)),)
ifeq ($(filter cfi,$(my_sanitize_diag)),)
ifeq ($(filter address,$(my_sanitize)),)
my_cflags += -fsanitize-minimal-runtime
my_cflags += -fno-sanitize-trap=integer
my_cflags += -fno-sanitize-recover=integer
endif
endif
endif
endif
endif
ifneq ($(strip $(LOCAL_SANITIZE_RECOVER)),)
recover_arg := $(subst $(space),$(comma),$(LOCAL_SANITIZE_RECOVER)),
my_cflags += -fsanitize-recover=$(recover_arg)