1 files changed, 47 insertions, 0 deletions
diff --git a/test/msan/fgets_fputs.cc b/test/msan/fgets_fputs.cc
new file mode 100644
index 000000000000..1e96943980d6
--- /dev/null
+++ b/test/msan/fgets_fputs.cc
@@ -0,0 +1,47 @@
+// RUN: %clangxx_msan -g %s -o %t
+// RUN: %run %t
+// RUN: not %run %t 2 2>&1 | FileCheck %s --check-prefix=CHECK-FPUTS
+// RUN: not %run %t 3 3 2>&1 | FileCheck %s --check-prefix=CHECK-PUTS
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int test_fgets() {
+  FILE *fp = fopen("/dev/zero", "r");
+  char c;
+
+  if (!fgets(&c, 1, fp))
+    return 1;
+
+  if (c == '1') // No error
+    return 2;
+
+  fclose(fp);
+  return 0;
+}
+
+int test_fputs() {
+  FILE *fp = fopen("/dev/null", "w");
+  char buf[2];
+  fputs(buf, fp); // BOOM
+  return fclose(fp);
+}
+
+void test_puts() {
+  char buf[2];
+  puts(buf); // BOOM
+}
+
+int main(int argc, char *argv[]) {
+  if (argc == 1)
+    test_fgets();
+  else if (argc == 2)
+    test_fputs();
+  else
+    test_puts();
+  return 0;
+}
+
+// CHECK-FPUTS: Uninitialized bytes in __interceptor_fputs at offset 0 inside
+// CHECK-PUTS: Uninitialized bytes in __interceptor_puts at offset 0 inside