25 lines · cpp
1// RUN: %clangxx_msan -O0 %s -o %t && %run %t2 3#include <sys/types.h>4#include <sys/socket.h>5#include <netdb.h>6#include <stdlib.h>7 8void poison_stack_ahead() {9 char buf[100000];10 // With -O0 this poisons a large chunk of stack.11}12 13int 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 a20 // stack-allocated buffer, which is very likely to be poisoned. Test that we21 // don't report this as an UMR.22 int res = getaddrinfo("not-in-etc-hosts", NULL, NULL, &ai);23 return 0;24}25