jmb/hardened_malloc
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make class_region_size configurable

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This commit is contained in:
Daniel Micay 2018-12-05 09:23:05 -05:00
parent 8b0450555f
commit 830a7d338d
4 changed files with 9 additions and 4 deletions
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3
Android.bp
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@ -23,8 +23,9 @@ common_cflags = [
"-DGUARD_SIZE_DIVISOR=2",
"-DREGION_QUARANTINE_RANDOM_SIZE=128",
"-DREGION_QUARANTINE_QUEUE_SIZE=1024",
"-DREGION_QUARANTINE_SKIP_THRESHOLD=33554432",
"-DREGION_QUARANTINE_SKIP_THRESHOLD=33554432", // 32MiB
"-DFREE_SLABS_QUARANTINE_RANDOM_SIZE=32",
"-DCONFIG_CLASS_REGION_SIZE=1073741824", // 1GiB
]
cc_defaults {

6
Makefile
View file

@ -12,8 +12,9 @@ CONFIG_GUARD_SLABS_INTERVAL := 1
CONFIG_GUARD_SIZE_DIVISOR := 2
CONFIG_REGION_QUARANTINE_RANDOM_SIZE := 128
CONFIG_REGION_QUARANTINE_QUEUE_SIZE := 1024
CONFIG_REGION_QUARANTINE_SKIP_THRESHOLD := 33554432
CONFIG_REGION_QUARANTINE_SKIP_THRESHOLD := 33554432 # 32MiB
CONFIG_FREE_SLABS_QUARANTINE_RANDOM_SIZE := 32
CONFIG_CLASS_REGION_SIZE := 137438953472 # 128GiB
define safe_flag
$(shell $(CC) -E $1 - </dev/null >/dev/null 2>&1 && echo $1)
@ -77,7 +78,8 @@ CPPFLAGS += \
-DREGION_QUARANTINE_RANDOM_SIZE=$(CONFIG_REGION_QUARANTINE_RANDOM_SIZE) \
-DREGION_QUARANTINE_QUEUE_SIZE=$(CONFIG_REGION_QUARANTINE_QUEUE_SIZE) \
-DREGION_QUARANTINE_SKIP_THRESHOLD=$(CONFIG_REGION_QUARANTINE_SKIP_THRESHOLD) \
-DFREE_SLABS_QUARANTINE_RANDOM_SIZE=$(CONFIG_FREE_SLABS_QUARANTINE_RANDOM_SIZE)
-DFREE_SLABS_QUARANTINE_RANDOM_SIZE=$(CONFIG_FREE_SLABS_QUARANTINE_RANDOM_SIZE) \
-DCONFIG_CLASS_REGION_SIZE=$(CONFIG_CLASS_REGION_SIZE)
libhardened_malloc.so: $(OBJECTS)
$(CC) $(CFLAGS) $(LDFLAGS) -shared $^ $(LDLIBS) -o $@

2
README.md
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@ -159,6 +159,8 @@ for the chosen values are not written yet, so use them at your own peril:
the size threshold where large allocations will not be quarantined
* `CONFIG_FREE_SLABS_QUARANTINE_RANDOM_SIZE`: `32` (default) to control the
number of slots in the random array used to randomize free slab reuse
* `CONFIG_CLASS_REGION_SIZE`: `34359738368` (default) to control the size of
the size class regions
There will be more control over enabled features in the future along with
control over fairly arbitrarily chosen values like the size of empty slab

2
h_malloc.c
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@ -210,7 +210,7 @@ struct __attribute__((aligned(CACHELINE_SIZE))) size_class {
size_t metadata_count_unguarded;
};
#define CLASS_REGION_SIZE (128ULL * 1024 * 1024 * 1024)
#define CLASS_REGION_SIZE (size_t)CONFIG_CLASS_REGION_SIZE
#define REAL_CLASS_REGION_SIZE (CLASS_REGION_SIZE * 2)
static const size_t slab_region_size = REAL_CLASS_REGION_SIZE * N_SIZE_CLASSES;
static_assert(PAGE_SIZE == 4096, "bitmap handling will need adjustment for other page sizes");