src/compiler-rt/test/esan/TestCases/workingset-early-fault.c

   1 // Test shadow faults during esan initialization as well as
   2 // faults during dlsym's calloc during interceptor init.
   3 //
   4 // RUN: %clang_esan_wset %s -o %t
   5 // RUN: %run %t 2>&1 | FileCheck %s
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <string.h>
  10
  11 // Our goal is to emulate an instrumented allocator, whose calloc
  12 // invoked from dlsym will trigger shadow faults, to test an
  13 // early shadow fault during esan interceptor init.
  14 // We do this by replacing calloc:
  15 void *calloc(size_t size, size_t n) {
  16   // Unfortunately we can't print anything to make the test
  17   // ensure we got here b/c the sanitizer interceptors can't
  18   // handle that during interceptor init.
  19
  20   // Ensure we trigger a shadow write fault:
  21   int x[16];
  22   x[0] = size;
  23   // Now just emulate calloc.
  24   void *res = malloc(size*n);
  25   memset(res, 0, size*n);
  26   return res;
  27 }
  28
  29 int main(int argc, char **argv) {
  30   printf("all done\n");
  31   return 0;
  32 }
  33 // CHECK: all done