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| author | Sergej Schumilo <sergej@schumilo.de> | 2022-01-21 21:07:28 +0100 |
|---|---|---|
| committer | Sergej Schumilo <sergej@schumilo.de> | 2022-01-21 21:07:28 +0100 |
| commit | 06ee6b1986dc83c65e67d827a4fdecc70942f4d1 (patch) | |
| tree | 7fd36987d35abecefb055c104955b74e345a71cf | |
| parent | 0090b3a3f01cad64a0d27c064d00eb87aa68ffef (diff) | |
| download | afl++-06ee6b1986dc83c65e67d827a4fdecc70942f4d1.tar.gz | |
update Nyx custom harness:
use a coverage bitmap that is smaller than 64k
| -rw-r--r-- | nyx_mode/custom_harness/example.c | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/nyx_mode/custom_harness/example.c b/nyx_mode/custom_harness/example.c index 00b516a2..dd268534 100644 --- a/nyx_mode/custom_harness/example.c +++ b/nyx_mode/custom_harness/example.c @@ -4,7 +4,10 @@ #include <inttypes.h> #include "nyx.h" -#define TRACE_BUFFER_SIZE (1024 * 64) +#define TRACE_BUFFER_SIZE (64) + +#define PAGE_SIZE 0x1000 +#define MMAP_SIZE(x) ((x & ~(PAGE_SIZE-1)) + PAGE_SIZE) int main(int argc, char **argv) { @@ -27,8 +30,8 @@ int main(int argc, char **argv) { /* this is our "bitmap" that is later shared with the fuzzer (you can also * pass the pointer of the bitmap used by compile-time instrumentations in * your target) */ - uint8_t *trace_buffer = mmap(NULL, TRACE_BUFFER_SIZE, PROT_READ | PROT_WRITE, - MAP_SHARED | MAP_ANONYMOUS, -1, 0); + uint8_t *trace_buffer = mmap(NULL, MMAP_SIZE(TRACE_BUFFER_SIZE), PROT_READ | + PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0); memset(trace_buffer, 0, TRACE_BUFFER_SIZE); // makes sure that the bitmap buffer is already // mapped into the guest's memory (alternatively |