emo/hardened_malloc
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add configuration for self-init

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This needs to be disabled for compatibility with the exploit protection
compatibility mode on GrapheneOS. hardened_malloc shouldn't be trying to
initialize itself when exploit protection compatibility mode is enabled.
This has to be handled in our Bionic integration instead.
This commit is contained in:
Daniel Micay 2022-09-14 03:19:23 -04:00
parent dd427cb3b8
commit 8f38bbdee6
5 changed files with 11 additions and 1 deletions
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1
Android.bp
View File

@ -29,6 +29,7 @@ common_cflags = [
"-DCONFIG_CLASS_REGION_SIZE=34359738368", // 32GiB "-DCONFIG_CLASS_REGION_SIZE=34359738368", // 32GiB
"-DN_ARENA=1", "-DN_ARENA=1",
"-DCONFIG_STATS=true", "-DCONFIG_STATS=true",
"-DCONFIG_SELF_INIT=false",
] ]
cc_defaults { cc_defaults {

7
Makefile
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@ -84,6 +84,10 @@ ifeq (,$(filter $(CONFIG_STATS),true false))
$(error CONFIG_STATS must be true or false) $(error CONFIG_STATS must be true or false)
endif endif
ifeq (,$(filter $(CONFIG_SELF_INIT),true false))
$(error CONFIG_SELF_INIT must be true or false)
endif
CPPFLAGS += \ CPPFLAGS += \
-DCONFIG_SEAL_METADATA=$(CONFIG_SEAL_METADATA) \ -DCONFIG_SEAL_METADATA=$(CONFIG_SEAL_METADATA) \
-DZERO_ON_FREE=$(CONFIG_ZERO_ON_FREE) \ -DZERO_ON_FREE=$(CONFIG_ZERO_ON_FREE) \
@ -102,7 +106,8 @@ CPPFLAGS += \
-DFREE_SLABS_QUARANTINE_RANDOM_LENGTH=$(CONFIG_FREE_SLABS_QUARANTINE_RANDOM_LENGTH) \ -DFREE_SLABS_QUARANTINE_RANDOM_LENGTH=$(CONFIG_FREE_SLABS_QUARANTINE_RANDOM_LENGTH) \
-DCONFIG_CLASS_REGION_SIZE=$(CONFIG_CLASS_REGION_SIZE) \ -DCONFIG_CLASS_REGION_SIZE=$(CONFIG_CLASS_REGION_SIZE) \
-DN_ARENA=$(CONFIG_N_ARENA) \ -DN_ARENA=$(CONFIG_N_ARENA) \
-DCONFIG_STATS=$(CONFIG_STATS) -DCONFIG_STATS=$(CONFIG_STATS) \
-DCONFIG_SELF_INIT=$(CONFIG_SELF_INIT)
$(OUT)/libhardened_malloc$(SUFFIX).so: $(OBJECTS) | $(OUT) $(OUT)/libhardened_malloc$(SUFFIX).so: $(OBJECTS) | $(OUT)
$(CC) $(CFLAGS) $(LDFLAGS) -shared $^ $(LDLIBS) -o $@ $(CC) $(CFLAGS) $(LDFLAGS) -shared $^ $(LDLIBS) -o $@

1
config/default.mk
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@ -20,3 +20,4 @@ CONFIG_FREE_SLABS_QUARANTINE_RANDOM_LENGTH := 32
CONFIG_CLASS_REGION_SIZE := 34359738368 # 32GiB CONFIG_CLASS_REGION_SIZE := 34359738368 # 32GiB
CONFIG_N_ARENA := 4 CONFIG_N_ARENA := 4
CONFIG_STATS := false CONFIG_STATS := false
CONFIG_SELF_INIT := true

1
config/light.mk
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@ -20,3 +20,4 @@ CONFIG_FREE_SLABS_QUARANTINE_RANDOM_LENGTH := 32
CONFIG_CLASS_REGION_SIZE := 34359738368 # 32GiB CONFIG_CLASS_REGION_SIZE := 34359738368 # 32GiB
CONFIG_N_ARENA := 4 CONFIG_N_ARENA := 4
CONFIG_STATS := false CONFIG_STATS := false
CONFIG_SELF_INIT := true

2
h_malloc.c
View File

@ -1183,11 +1183,13 @@ static inline unsigned init(void) {
return arena; return arena;
} }
#if CONFIG_SELF_INIT
// trigger early initialization to set up pthread_atfork and protect state as soon as possible // trigger early initialization to set up pthread_atfork and protect state as soon as possible
COLD __attribute__((constructor(101))) static void trigger_early_init(void) { COLD __attribute__((constructor(101))) static void trigger_early_init(void) {
// avoid calling init directly to skip it if this isn't the malloc implementation // avoid calling init directly to skip it if this isn't the malloc implementation
h_free(h_malloc(16)); h_free(h_malloc(16));
} }
#endif
// Returns 0 on overflow. // Returns 0 on overflow.
static size_t get_large_size_class(size_t size) { static size_t get_large_size_class(size_t size) {