compiler-rt/test/msan/getaddrinfo.cpp

   1 // RUN: %clangxx_msan -O0 %s -o %t && %run %t
   2
   3 #include <sys/types.h>
   4 #include <sys/socket.h>
   5 #include <netdb.h>
   6 #include <stdlib.h>
   7
   8 void poison_stack_ahead() {
   9   char buf[100000];
  10   // With -O0 this poisons a large chunk of stack.
  11 }
  12
  13 int main(void) {
  14   poison_stack_ahead();
  15
  16   struct addrinfo *ai;
  17
  18   // This should trigger loading of libnss_dns and friends.
  19   // Those libraries are typically uninstrumented.They will call strlen() on a
  20   // stack-allocated buffer, which is very likely to be poisoned. Test that we
  21   // don't report this as an UMR.
  22   int res = getaddrinfo("not-in-etc-hosts", NULL, NULL, &ai);
  23   return 0;
  24 }