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Suppress UBSAN error in finer guanularity

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Summary:
Now we suppress alignment UBSAN error as a whole. Suppressing 3-way CRC and murmurhash feels a better idea than turning off alignment check as a whole.
Closes https://github.com/facebook/rocksdb/pull/3495

Differential Revision: D6971273

Pulled By: siying

fbshipit-source-id: 080b59fed6df494b9f622ef7cb5d42d39e6a8cdf
This commit is contained in:
Siying Dong 2018-02-13 12:05:36 -08:00 committed by Facebook Github Bot
parent 3c380fdffd
commit 74748611a8
3 changed files with 24 additions and 3 deletions
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6
Makefile
View File

@ -236,9 +236,9 @@ ifdef COMPILE_WITH_UBSAN
# memory to integer. Fixing it may cause performance regression. 3-way crc32
# relies on it too, although it can be rewritten to eliminate with minimal
# performance regression.
EXEC_LDFLAGS += -fsanitize=undefined -fno-sanitize-recover -fno-sanitize=alignment
PLATFORM_CCFLAGS += -fsanitize=undefined -fno-sanitize-recover -fno-sanitize=alignment -DROCKSDB_UBSAN_RUN
PLATFORM_CXXFLAGS += -fsanitize=undefined -fno-sanitize-recover -fno-sanitize=alignment -DROCKSDB_UBSAN_RUN
EXEC_LDFLAGS += -fsanitize=undefined -fno-sanitize-recover=all
PLATFORM_CCFLAGS += -fsanitize=undefined -fno-sanitize-recover=all -DROCKSDB_UBSAN_RUN
PLATFORM_CXXFLAGS += -fsanitize=undefined -fno-sanitize-recover=all -DROCKSDB_UBSAN_RUN
endif
ifdef ROCKSDB_VALGRIND_RUN

14
util/crc32c.cc
View File

@ -605,6 +605,13 @@ const uint64_t clmul_constants[] = {
};
// Compute the crc32c value for buffer smaller than 8
#ifdef ROCKSDB_UBSAN_RUN
#if defined(__clang__)
__attribute__((__no_sanitize__("alignment")))
#elif defined(__GNUC__)
__attribute__((__no_sanitize_undefined__))
#endif
#endif
inline void align_to_8(
size_t len,
uint64_t& crc0, // crc so far, updated on return
@ -649,6 +656,13 @@ inline uint64_t CombineCRC(
}
// Compute CRC-32C using the Intel hardware instruction.
#ifdef ROCKSDB_UBSAN_RUN
#if defined(__clang__)
__attribute__((__no_sanitize__("alignment")))
#elif defined(__GNUC__)
__attribute__((__no_sanitize_undefined__))
#endif
#endif
uint32_t crc32c_3way(uint32_t crc, const char* buf, size_t len) {
const unsigned char* next = (const unsigned char*)buf;
uint64_t count;

7
util/murmurhash.cc
View File

@ -20,6 +20,13 @@
//
// 64-bit hash for 64-bit platforms
#ifdef ROCKSDB_UBSAN_RUN
#if defined(__clang__)
__attribute__((__no_sanitize__("alignment")))
#elif defined(__GNUC__)
__attribute__((__no_sanitize_undefined__))
#endif
#endif
uint64_t MurmurHash64A ( const void * key, int len, unsigned int seed )
{
const uint64_t m = 0xc6a4a7935bd1e995;