1 // RUN: %clangxx_msan -m64 -O0 %s -o %t && %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 } 25
