COMMON_MALLOC_FREE(zone);
}
+extern unsigned malloc_num_zones;
+extern malloc_zone_t **malloc_zones;
+
+// We need to make sure that sanitizer_zone is registered as malloc_zones[0]. If
+// libmalloc tries to set up a different zone as malloc_zones[0], it will call
+// mprotect(malloc_zones, ..., PROT_READ). This interceptor will catch that and
+// make sure we are still the first (default) zone.
+INTERCEPTOR(int, mprotect, void *addr, size_t len, int prot) {
+ if (addr == malloc_zones && prot == PROT_READ) {
+ if (malloc_num_zones > 1 && malloc_zones[0] != &sanitizer_zone) {
+ for (unsigned i = 1; i < malloc_num_zones; i++) {
+ if (malloc_zones[i] == &sanitizer_zone) {
+ // Swap malloc_zones[0] and malloc_zones[i].
+ malloc_zones[i] = malloc_zones[0];
+ malloc_zones[0] = &sanitizer_zone;
+ break;
+ }
+ }
+ }
+ }
+ return REAL(mprotect)(addr, len, prot);
+}
+
INTERCEPTOR(malloc_zone_t *, malloc_default_zone, void) {
COMMON_MALLOC_ENTER();
return &sanitizer_zone;