blacklist UBSAN's unsigned integer overflow

Integer overflow for unsigned types are fully defined in C. They
are not always problematic (but not always OK).  These functions
in this changeset intentionally utilizes that behaviour.
Blacklist from UBSAN checks for better output.

See also: https://travis-ci.org/ruby/ruby/jobs/451624829


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65589 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

random.c

@@ -112,6 +112,9 @@ struct MT {
 #define genrand_initialized(mt) ((mt)->next != 0)
 #define uninit_genrand(mt) ((mt)->next = 0)
 
+NO_SANITIZE("unsigned-integer-overflow", static void init_genrand(struct MT *mt, unsigned int s));
+NO_SANITIZE("unsigned-integer-overflow", static void init_by_array(struct MT *mt, const uint32_t init_key[], int key_length));
+
 /* initializes state[N] with a seed */
 static void
 init_genrand(struct MT *mt, unsigned int s)

siphash.h

@@ -43,6 +43,6 @@ int sip_hash_digest_integer(sip_hash *h, const uint8_t *data, size_t data_len, u
 void sip_hash_free(sip_hash *h);
 void sip_hash_dump(sip_hash *h);
 
-uint64_t sip_hash13(const uint8_t key[16], const uint8_t *data, size_t len);
+NO_SANITIZE("unsigned-integer-overflow", uint64_t sip_hash13(const uint8_t key[16], const uint8_t *data, size_t len));
 
 #endif

st.c

@@ -1766,6 +1766,10 @@ st_values_check(st_table *tab, st_data_t *values, st_index_t size,
 #define C1 BIG_CONSTANT(0x87c37b91,0x114253d5);
 #define C2 BIG_CONSTANT(0x4cf5ad43,0x2745937f);
 #endif
+NO_SANITIZE("unsigned-integer-overflow", static inline st_index_t murmur_step(st_index_t h, st_index_t k));
+NO_SANITIZE("unsigned-integer-overflow", static inline st_index_t murmur_finish(st_index_t h));
+NO_SANITIZE("unsigned-integer-overflow", extern st_index_t st_hash(const void *ptr, size_t len, st_index_t h));
+
 static inline st_index_t
 murmur_step(st_index_t h, st_index_t k)
 {
@@ -2052,7 +2056,7 @@ st_locale_insensitive_strncasecmp(const char *s1, const char *s2, size_t n)
     return 0;
 }
 
-PUREFUNC(static st_index_t strcasehash(st_data_t));
+NO_SANITIZE("unsigned-integer-overflow", PUREFUNC(static st_index_t strcasehash(st_data_t)));
 static st_index_t
 strcasehash(st_data_t arg)
 {