1 files changed, 33 insertions, 0 deletions
diff --git a/lib/msan/lit_tests/ioctl_custom.cc b/lib/msan/lit_tests/ioctl_custom.cc
new file mode 100644
index 0000000000000..94ed528c70b91
--- /dev/null
+++ b/lib/msan/lit_tests/ioctl_custom.cc
@@ -0,0 +1,33 @@
+// RUN: %clangxx_msan -m64 -O0 -g %s -o %t && %t
+// RUN: %clangxx_msan -m64 -O3 -g %s -o %t && %t
+
+// RUN: %clangxx_msan -DPOSITIVE -m64 -O0 -g %s -o %t && not %t 2>&1 | FileCheck %s
+// RUN: %clangxx_msan -DPOSITIVE -m64 -O3 -g %s -o %t && not %t 2>&1 | FileCheck %s
+
+#include <assert.h>
+#include <stdlib.h>
+#include <net/if.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+int main(int argc, char **argv) {
+  int fd = socket(AF_INET, SOCK_STREAM, 0);
+
+  struct ifreq ifreqs[20];
+  struct ifconf ifc;
+  ifc.ifc_ifcu.ifcu_req = ifreqs;
+#ifndef POSITIVE
+  ifc.ifc_len = sizeof(ifreqs);
+#endif
+  int res = ioctl(fd, SIOCGIFCONF, (void *)&ifc);
+  // CHECK: UMR in ioctl{{.*}} at offset 0
+  // CHECK: WARNING: MemorySanitizer: use-of-uninitialized-value
+  // CHECK: #{{.*}} in main {{.*}}ioctl_custom.cc:[[@LINE-3]]
+  assert(res == 0);
+  for (int i = 0; i < ifc.ifc_len / sizeof(*ifc.ifc_ifcu.ifcu_req); ++i)
+    printf("%d  %zu  %s\n", i, strlen(ifreqs[i].ifr_name), ifreqs[i].ifr_name);
+  return 0;
+}