config_sanitizers.mk revision 29224114467dbe8232a0ba709820a323b9160574 
1##############################################
2## Perform configuration steps for sanitizers.
3##############################################
4
5my_sanitize := $(strip $(LOCAL_SANITIZE))
6
7# Don't apply sanitizers to NDK code.
8ifdef LOCAL_SDK_VERSION
9  my_sanitize := never
10endif
11
12# Configure SANITIZE_HOST / SANITIZE_TARGET.
13ifeq ($(my_sanitize),)
14  ifdef LOCAL_IS_HOST_MODULE
15    my_sanitize := $(strip $(SANITIZE_HOST))
16  else
17    my_sanitize := $(strip $(SANITIZE_TARGET))
18  endif
19
20  # SANITIZE_HOST=true is a deprecated way to say SANITIZE_HOST=address.
21  ifeq ($(my_sanitize),true)
22    my_sanitize := address
23  endif
24
25  # SANITIZE_HOST is only in effect if the module is already using clang (host
26  # modules that haven't set `LOCAL_CLANG := false` and device modules that
27  # have set `LOCAL_CLANG := true`.
28  ifneq ($(my_clang),true)
29    my_sanitize :=
30  endif
31endif
32
33ifeq ($(my_sanitize),never)
34  my_sanitize :=
35endif
36
37# TSAN is not supported on 32-bit architectures. For non-multilib cases, make
38# its use an error. For multilib cases, don't use it for the 32-bit case.
39ifneq ($(filter thread,$(my_sanitize)),)
40  ifeq ($(my_32_64_bit_suffix),32)
41    ifeq ($(my_module_multilib),both)
42        my_sanitize := $(filter-out thread,$(my_sanitize))
43    else
44        $(error $(LOCAL_PATH): $(LOCAL_MODULE): TSAN cannot be used for 32-bit modules.)
45    endif
46  endif
47endif
48
49# Undefined symbols can occur if a non-sanitized library links
50# sanitized static libraries. That's OK, because the executable
51# always depends on the ASan runtime library, which defines these
52# symbols.
53ifneq ($(strip $(SANITIZE_TARGET)),)
54  ifndef LOCAL_IS_HOST_MODULE
55    ifeq ($(LOCAL_MODULE_CLASS),SHARED_LIBRARIES)
56      ifeq ($(my_sanitize),)
57        my_allow_undefined_symbols := true
58      endif
59    endif
60    # Workaround for a bug in AddressSanitizer that breaks stack unwinding.
61    # https://code.google.com/p/address-sanitizer/issues/detail?id=387
62    # Revert when external/compiler-rt is updated past r236014.
63    LOCAL_PACK_MODULE_RELOCATIONS := false
64  endif
65endif
66
67# Sanitizers can only be used with clang.
68ifneq ($(my_clang),true)
69  ifneq ($(my_sanitize),)
70    $(error $(LOCAL_PATH): $(LOCAL_MODULE): Use of sanitizers requires LOCAL_CLANG := true)
71  endif
72endif
73
74ifneq ($(filter default-ub,$(my_sanitize)),)
75  my_sanitize := $(CLANG_DEFAULT_UB_CHECKS)
76endif
77
78ifneq ($(my_sanitize),)
79  fsanitize_arg := $(subst $(space),$(comma),$(my_sanitize)),
80  my_cflags += -fsanitize=$(fsanitize_arg)
81
82  ifdef LOCAL_IS_HOST_MODULE
83    my_cflags += -fno-sanitize-recover=all
84    my_ldflags += -fsanitize=$(fsanitize_arg)
85    my_ldlibs += -lrt -ldl
86  else
87    my_cflags += -fsanitize-undefined-trap-on-error
88    my_cflags += -ftrap-function=abort
89    my_shared_libraries += libdl
90  endif
91endif
92
93ifneq ($(filter address,$(my_sanitize)),)
94  # Frame pointer based unwinder in ASan requires ARM frame setup.
95  LOCAL_ARM_MODE := arm
96  my_cflags += $(ADDRESS_SANITIZER_CONFIG_EXTRA_CFLAGS)
97  my_ldflags += $(ADDRESS_SANITIZER_CONFIG_EXTRA_LDFLAGS)
98  ifdef LOCAL_IS_HOST_MODULE
99    # -nodefaultlibs (provided with libc++) prevents the driver from linking
100    # libraries needed with -fsanitize=address. http://b/18650275 (WAI)
101    my_ldlibs += -lm -lpthread
102    my_ldflags += -Wl,--no-as-needed
103  else
104    my_cflags += -mllvm -asan-globals=0
105    # ASan runtime library must be the first in the link order.
106    my_shared_libraries := $($(LOCAL_2ND_ARCH_VAR_PREFIX)ADDRESS_SANITIZER_RUNTIME_LIBRARY) \
107                           $(my_shared_libraries) \
108                           $(ADDRESS_SANITIZER_CONFIG_EXTRA_SHARED_LIBRARIES)
109    my_static_libraries += $(ADDRESS_SANITIZER_CONFIG_EXTRA_STATIC_LIBRARIES)
110    my_ldflags += -Wl,-rpath,$($(LOCAL_2ND_ARCH_VAR_PREFIX)ADDRESS_SANITIZER_RPATH)
111    my_linker := $($(LOCAL_2ND_ARCH_VAR_PREFIX)ADDRESS_SANITIZER_LINKER)
112  endif
113endif
114
115ifneq ($(filter undefined,$(my_sanitize)),)
116  ifndef LOCAL_IS_HOST_MODULE
117    $(error ubsan is not yet supported on the target)
118  endif
119endif
120
121ifneq ($(strip $(LOCAL_SANITIZE_RECOVER)),)
122  recover_arg := $(subst $(space),$(comma),$(LOCAL_SANITIZE_RECOVER)),
123  my_cflags += -fsanitize-recover=$(recover_arg)
124endif
125