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radamsa mutator as havoc cycle replacement with probability 1/24

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This commit is contained in:
Andrea Fioraldi
2019-10-10 19:46:46 +02:00
parent 125a59df91
commit 9de74cce92
7 changed files with 122 additions and 20 deletions
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20
include/afl-fuzz.h
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@ -284,6 +284,8 @@ extern char* power_names[POWER_SCHEDULES_NUM];
extern u8 schedule; /* Power schedule (default: EXPLORE)*/
extern u8 havoc_max_mult;
extern u8 use_radamsa;
extern u8 skip_deterministic, /* Skip deterministic stages? */
force_deterministic, /* Force deterministic stages? */
use_splicing, /* Recombine input files? */
@ -399,6 +401,9 @@ extern u64 stage_finds[32], /* Patterns found per fuzz stage */
extern u32 rand_cnt; /* Random number counter */
#endif
extern u32 rand_seed[2];
extern s64 init_seed;
extern u64 total_cal_us, /* Total calibration time (us) */
total_cal_cycles; /* Total calibration cycles */
@ -642,11 +647,9 @@ static inline u32 UR(u32 limit) {
#else
if (!fixed_seed && unlikely(!rand_cnt--)) {
u32 seed[2];
ck_read(dev_urandom_fd, &seed, sizeof(seed), "/dev/urandom");
srandom(seed[0]);
rand_cnt = (RESEED_RNG / 2) + (seed[1] % RESEED_RNG);
ck_read(dev_urandom_fd, &rand_seed, sizeof(rand_seed), "/dev/urandom");
srandom(rand_seed[0]);
rand_cnt = (RESEED_RNG / 2) + (rand_seed[1] % RESEED_RNG);
}
@ -655,6 +658,13 @@ static inline u32 UR(u32 limit) {
}
static inline u32 get_rand_seed() {
if (fixed_seed) return (u32)init_seed;
return rand_seed[0];
}
/* Find first power of two greater or equal to val (assuming val under
2^63). */