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update Nyx custom harness:

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use a coverage bitmap that is smaller than 64k
This commit is contained in:
Sergej Schumilo 2022-01-21 21:07:28 +01:00
parent 0090b3a3f0
commit 06ee6b1986
1 changed files with 6 additions and 3 deletions
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9
nyx_mode/custom_harness/example.c
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@ -4,7 +4,10 @@
#include <inttypes.h> #include <inttypes.h>
#include "nyx.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) { 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 /* 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 * pass the pointer of the bitmap used by compile-time instrumentations in
* your target) */ * your target) */
uint8_t *trace_buffer = mmap(NULL, TRACE_BUFFER_SIZE, PROT_READ | PROT_WRITE, uint8_t *trace_buffer = mmap(NULL, MMAP_SIZE(TRACE_BUFFER_SIZE), PROT_READ |
MAP_SHARED | MAP_ANONYMOUS, -1, 0); PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
memset(trace_buffer, 0, memset(trace_buffer, 0,
TRACE_BUFFER_SIZE); // makes sure that the bitmap buffer is already TRACE_BUFFER_SIZE); // makes sure that the bitmap buffer is already
// mapped into the guest's memory (alternatively // mapped into the guest's memory (alternatively