test/msan/wrap_indirect_calls2.cc

   1 // Test __msan_set_indirect_call_wrapper.
   2
   3 // RUN: %clangxx_msan -mllvm -msan-wrap-indirect-calls=__msan_wrap_indirect_call \
   4 // RUN:     -mllvm -msan-wrap-indirect-calls-fast=0 \
   5 // RUN:     -O0 -g -rdynamic -Wl,--defsym=__executable_start=0 %s -o %t && %run %t
   6
   7 // This test disables -msan-wrap-indirect-calls-fast, otherwise indirect calls
   8 // inside the same module are short-circuited and are never seen by the wrapper.
   9
  10 #include <assert.h>
  11 #include <pthread.h>
  12 #include <stdio.h>
  13 #include <stdint.h>
  14
  15 extern "C" void __msan_set_indirect_call_wrapper(uintptr_t);
  16
  17 bool done_f, done_g;
  18
  19 void f(void) {
  20   assert(!done_g);
  21   done_f = true;
  22 }
  23
  24 void g(void) {
  25   assert(done_f);
  26   done_g = true;
  27 }
  28
  29 typedef void (*Fn)(void);
  30 extern "C" Fn my_wrapper(Fn target) {
  31   if (target == f) return g;
  32   return target;
  33 }
  34
  35 int main(void) {
  36   volatile Fn fp;
  37   fp = &f;
  38   fp();
  39   __msan_set_indirect_call_wrapper((uintptr_t)my_wrapper);
  40   fp();
  41   return !(done_f && done_g);
  42 }