Increase number of edges that can be used.

This allows us to fuzz targets with more edges, i.e. Chrome.

Author: carl-smith

Sources/libcoverage/include/libcoverage.h

@@ -33,7 +33,10 @@ struct edge_counts {
     uint32_t * edge_hit_count;
 };
 
-#define SHM_SIZE 0x100000
+// Size of the shared memory region. Defines an upper limit on the number of
+// coverage edges that can be tracked. When bumping this number, please also
+// update Target/coverage.c.
+#define SHM_SIZE 0x200000
 #define MAX_EDGES ((SHM_SIZE - 4) * 8)
 
 // Structure of the shared memory region.

Targets/coverage.c

@@ -10,7 +10,7 @@
 #define REPRL_DRFD 102
 #define REPRL_DWFD 103
 
-#define SHM_SIZE 0x100000
+#define SHM_SIZE 0x200000
 #define MAX_EDGES ((SHM_SIZE - 4) * 8)
 
 #define CHECK(cond) if (!(cond)) { fprintf(stderr, "\"" #cond "\" failed\n"); _exit(-1); }