1 // RUN: %clang -shared -fPIC -D_DSO -O2 -D_FORTIFY_SOURCE=2 %s -o %t.so
2 // RUN: %clang_asan %s -o %t %t.so
3 // RUN: not %run %t 2>&1 | FileCheck %s
4 // UNSUPPORTED: android
5 #ifdef _DSO
6 #include <stdarg.h>
7 #include <stdio.h>
8 #include <stdlib.h>
9 #include <string.h>
foo(const char * format,...)10 __attribute__((noinline)) char foo(const char *format, ...) {
11   char *write_buffer = (char *)malloc(1);
12   va_list ap;
13   va_start(ap, format);
14   // CHECK: AddressSanitizer: heap-buffer-overflow
15   vsprintf(write_buffer, format, ap);
16   va_end(ap);
17   return write_buffer[0];
18 }
19 #else
20 extern int foo(const char *format, ...);
main()21 int main() { return foo("%s_%s", "one", "two"); }
22 #endif
23