diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index c444231..ab9eb8c 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -182,7 +182,7 @@
 {
 #if defined(HAVE_FSTAT) || defined(MS_WINDOWS)
     struct _Py_stat_struct buf;
-    if (!_PyVerify_fd(fd) || (_Py_fstat(fd, &buf) < 0 && errno == EBADF)) {
+    if (_Py_fstat(fd, &buf) < 0 && errno == EBADF) {
         PyObject *exc;
         char *msg = strerror(EBADF);
         exc = PyObject_CallFunction(PyExc_OSError, "(is)",
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index e381bf1..679fc8f 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -1051,99 +1051,16 @@
 }
 
 
-#if defined _MSC_VER && _MSC_VER >= 1400
-/* Microsoft CRT in VS2005 and higher will verify that a filehandle is
- * valid and raise an assertion if it isn't.
- * Normally, an invalid fd is likely to be a C program error and therefore
- * an assertion can be useful, but it does contradict the POSIX standard
- * which for write(2) states:
- *    "Otherwise, -1 shall be returned and errno set to indicate the error."
- *    "[EBADF] The fildes argument is not a valid file descriptor open for
- *     writing."
- * Furthermore, python allows the user to enter any old integer
- * as a fd and should merely raise a python exception on error.
- * The Microsoft CRT doesn't provide an official way to check for the
- * validity of a file descriptor, but we can emulate its internal behaviour
- * by using the exported __pinfo data member and knowledge of the
- * internal structures involved.
- * The structures below must be updated for each version of visual studio
- * according to the file internal.h in the CRT source, until MS comes
- * up with a less hacky way to do this.
- * (all of this is to avoid globally modifying the CRT behaviour using
- * _set_invalid_parameter_handler() and _CrtSetReportMode())
+#if defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900
+/* Legacy implementation of _PyVerify_fd_dup2 while transitioning to
+ * MSVC 14.0. This should eventually be removed. (issue23524)
  */
-/* The actual size of the structure is determined at runtime.
- * Only the first items must be present.
- */
-
-#if _MSC_VER >= 1900
-
-typedef struct {
-    CRITICAL_SECTION lock;
-    intptr_t osfhnd;
-    __int64 startpos;
-    char osfile;
-} my_ioinfo;
-
-#define IOINFO_L2E 6
-#define IOINFO_ARRAYS 128
-
-#else
-
-typedef struct {
-    intptr_t osfhnd;
-    char osfile;
-} my_ioinfo;
-
 #define IOINFO_L2E 5
 #define IOINFO_ARRAYS 64
-
-#endif
-
-extern __declspec(dllimport) char * __pioinfo[];
 #define IOINFO_ARRAY_ELTS   (1 << IOINFO_L2E)
 #define _NHANDLE_           (IOINFO_ARRAYS * IOINFO_ARRAY_ELTS)
-#define FOPEN 0x01
 #define _NO_CONSOLE_FILENO (intptr_t)-2
 
-/* This function emulates what the windows CRT does to validate file handles */
-int
-_PyVerify_fd(int fd)
-{
-    const int i1 = fd >> IOINFO_L2E;
-    const int i2 = fd & ((1 << IOINFO_L2E) - 1);
-
-    static size_t sizeof_ioinfo = 0;
-
-    /* Determine the actual size of the ioinfo structure,
-     * as used by the CRT loaded in memory
-     */
-    if (sizeof_ioinfo == 0 && __pioinfo[0] != NULL) {
-        sizeof_ioinfo = _msize(__pioinfo[0]) / IOINFO_ARRAY_ELTS;
-    }
-    if (sizeof_ioinfo == 0) {
-        /* This should not happen... */
-        goto fail;
-    }
-
-    /* See that it isn't a special CLEAR fileno */
-    if (fd != _NO_CONSOLE_FILENO) {
-        /* Microsoft CRT would check that 0<=fd<_nhandle but we can't do that.  Instead
-         * we check pointer validity and other info
-         */
-        if (0 <= i1 && i1 < IOINFO_ARRAYS && __pioinfo[i1] != NULL) {
-            /* finally, check that the file is open */
-            my_ioinfo* info = (my_ioinfo*)(__pioinfo[i1] + i2 * sizeof_ioinfo);
-            if (info->osfile & FOPEN) {
-                return 1;
-            }
-        }
-    }
-  fail:
-    errno = EBADF;
-    return 0;
-}
-
 /* the special case of checking dup2.  The target fd must be in a sensible range */
 static int
 _PyVerify_fd_dup2(int fd1, int fd2)
@@ -1158,8 +1075,7 @@
         return 0;
 }
 #else
-/* dummy version. _PyVerify_fd() is already defined in fileobject.h */
-#define _PyVerify_fd_dup2(A, B) (1)
+#define _PyVerify_fd_dup2(fd1, fd2) (_PyVerify_fd(fd1) && (fd2) >= 0)
 #endif
 
 #ifdef MS_WINDOWS