diff --git a/Include/fileutils.h b/Include/fileutils.h
index 2430c266c00..b4a683c176c 100644
--- a/Include/fileutils.h
+++ b/Include/fileutils.h
@@ -121,7 +121,7 @@ PyAPI_FUNC(int) _Py_get_blocking(int fd);
 PyAPI_FUNC(int) _Py_set_blocking(int fd, int blocking);
 #endif   /* !MS_WINDOWS */
 
-#if defined _MSC_VER && _MSC_VER >= 1400
+#if defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900
 /* A routine to check if a file descriptor is valid on Windows.  Returns 0
  * and sets errno to EBADF if it isn't.  This is to avoid Assertions
  * from various functions in the Windows CRT beginning with
diff --git a/Include/pyport.h b/Include/pyport.h
index e4b2cf00c18..82ad7183fbd 100644
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -877,4 +877,24 @@ extern pid_t forkpty(int *, char *, struct termios *, struct winsize *);
 #define PY_LITTLE_ENDIAN 1
 #endif
 
+#ifdef Py_BUILD_CORE 
+/*
+ * Macros to protect CRT calls against instant termination when passed an
+ * invalid parameter (issue23524).
+ */
+#if defined _MSC_VER && _MSC_VER >= 1900
+
+extern _invalid_parameter_handler _Py_silent_invalid_parameter_handler;
+#define _Py_BEGIN_SUPPRESS_IPH { _invalid_parameter_handler _Py_old_handler = \
+    _set_thread_local_invalid_parameter_handler(_Py_silent_invalid_parameter_handler);
+#define _Py_END_SUPPRESS_IPH _set_thread_local_invalid_parameter_handler(_Py_old_handler); }
+
+#else
+
+#define _Py_BEGIN_SUPPRESS_IPH
+#define _Py_END_SUPPRESS_IPH
+
+#endif /* _MSC_VER >= 1900 */
+#endif /* Py_BUILD_CORE */
+
 #endif /* Py_PYPORT_H */
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index bb3e9b9f94a..186319bfdf2 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -107,9 +107,11 @@ internal_close(fileio *self)
         /* fd is accessible and someone else may have closed it */
         if (_PyVerify_fd(fd)) {
             Py_BEGIN_ALLOW_THREADS
+            _Py_BEGIN_SUPPRESS_IPH
             err = close(fd);
             if (err < 0)
                 save_errno = errno;
+            _Py_END_SUPPRESS_IPH
             Py_END_ALLOW_THREADS
         } else {
             save_errno = errno;
@@ -599,11 +601,14 @@ fileio_readall(fileio *self)
     if (!_PyVerify_fd(self->fd))
         return PyErr_SetFromErrno(PyExc_IOError);
 
+    _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
     pos = _lseeki64(self->fd, 0L, SEEK_CUR);
 #else
     pos = lseek(self->fd, 0L, SEEK_CUR);
 #endif
+    _Py_END_SUPPRESS_IPH
+
     if (_Py_fstat_noraise(self->fd, &status) == 0)
         end = status.st_size;
     else
@@ -792,11 +797,13 @@ portable_lseek(int fd, PyObject *posobj, int whence)
 
     if (_PyVerify_fd(fd)) {
         Py_BEGIN_ALLOW_THREADS
+        _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
         res = _lseeki64(fd, pos, whence);
 #else
         res = lseek(fd, pos, whence);
 #endif
+        _Py_END_SUPPRESS_IPH
         Py_END_ALLOW_THREADS
     } else
         res = -1;
@@ -951,7 +958,12 @@ fileio_isatty(fileio *self)
     if (self->fd < 0)
         return err_closed();
     Py_BEGIN_ALLOW_THREADS
-    res = isatty(self->fd);
+    _Py_BEGIN_SUPPRESS_IPH
+    if (_PyVerify_fd(self->fd))
+        res = isatty(self->fd);
+    else
+        res = 0;
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     return PyBool_FromLong(res);
 }
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index e2ed5f9c8d9..c5ba4b7045b 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -1325,11 +1325,13 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
      */
     if (fileno != -1 && fileno != 0) {
         /* Ensure that fileno is within the CRT's valid range */
-        if (_PyVerify_fd(fileno) == 0) {
+        if (!_PyVerify_fd(fileno)) {
             PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
         }
+        _Py_BEGIN_SUPPRESS_IPH
         fh = (HANDLE)_get_osfhandle(fileno);
+        _Py_END_SUPPRESS_IPH
         if (fh==(HANDLE)-1) {
             PyErr_SetFromErrno(PyExc_OSError);
             return NULL;
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 724acc63d11..fcabadd2c89 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -1280,10 +1280,6 @@ fildes_converter(PyObject *o, void *p)
     fd = PyObject_AsFileDescriptor(o);
     if (fd < 0)
         return 0;
-    if (!_PyVerify_fd(fd)) {
-        posix_error();
-        return 0;
-    }
     *pointer = fd;
     return 1;
 }
@@ -1294,9 +1290,14 @@ posix_fildes_fd(int fd, int (*func)(int))
     int res;
     int async_err = 0;
 
+    if (!_PyVerify_fd(fd))
+        return posix_error();
+
     do {
         Py_BEGIN_ALLOW_THREADS
+        _Py_BEGIN_SUPPRESS_IPH
         res = (*func)(fd);
+        _Py_END_SUPPRESS_IPH
         Py_END_ALLOW_THREADS
     } while (res != 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
     if (res != 0)
@@ -4359,6 +4360,7 @@ os_unlink_impl(PyModuleDef *module, path_t *path, int dir_fd)
     int result;
 
     Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
     if (path->wide)
         result = Py_DeleteFileW(path->wide);
@@ -4373,6 +4375,7 @@ os_unlink_impl(PyModuleDef *module, path_t *path, int dir_fd)
 #endif /* HAVE_UNLINKAT */
         result = unlink(path->narrow);
 #endif
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
 
     if (result)
@@ -7692,6 +7695,7 @@ os_open_impl(PyModuleDef *module, path_t *path, int flags, int mode, int dir_fd)
     flags |= O_CLOEXEC;
 #endif
 
+    _Py_BEGIN_SUPPRESS_IPH
     do {
         Py_BEGIN_ALLOW_THREADS
 #ifdef MS_WINDOWS
@@ -7707,6 +7711,7 @@ os_open_impl(PyModuleDef *module, path_t *path, int flags, int mode, int dir_fd)
             fd = open(path->narrow, flags, mode);
         Py_END_ALLOW_THREADS
     } while (fd < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
+    _Py_END_SUPPRESS_IPH
 
     if (fd == -1) {
         if (!async_err)
@@ -7745,7 +7750,9 @@ os_close_impl(PyModuleDef *module, int fd)
      * for more details.
      */
     Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
     res = close(fd);
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     if (res < 0)
         return posix_error();
@@ -7769,9 +7776,11 @@ os_closerange_impl(PyModuleDef *module, int fd_low, int fd_high)
 {
     int i;
     Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
     for (i = fd_low; i < fd_high; i++)
         if (_PyVerify_fd(i))
             close(i);
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     Py_RETURN_NONE;
 }
@@ -7823,7 +7832,9 @@ os_dup2_impl(PyModuleDef *module, int fd, int fd2, int inheritable)
      */
 #ifdef MS_WINDOWS
     Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
     res = dup2(fd, fd2);
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     if (res < 0)
         return posix_error();
@@ -7957,11 +7968,13 @@ os_lseek_impl(PyModuleDef *module, int fd, Py_off_t position, int how)
         return -1;
     }
     Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
     result = _lseeki64(fd, position, how);
 #else
     result = lseek(fd, position, how);
 #endif
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     if (result < 0)
         posix_error();
@@ -8168,7 +8181,9 @@ os_pread_impl(PyModuleDef *module, int fd, int length, Py_off_t offset)
 
     do {
         Py_BEGIN_ALLOW_THREADS
+        _Py_BEGIN_SUPPRESS_IPH
         n = pread(fd, PyBytes_AS_STRING(buffer), length, offset);
+        _Py_END_SUPPRESS_IPH
         Py_END_ALLOW_THREADS
     } while (n < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
 
@@ -8276,6 +8291,7 @@ posix_sendfile(PyObject *self, PyObject *args, PyObject *kwdict)
         }
     }
 
+    _Py_BEGIN_SUPPRESS_IPH
     do {
         Py_BEGIN_ALLOW_THREADS
 #ifdef __APPLE__
@@ -8285,6 +8301,7 @@ posix_sendfile(PyObject *self, PyObject *args, PyObject *kwdict)
 #endif
         Py_END_ALLOW_THREADS
     } while (ret < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
+    _Py_END_SUPPRESS_IPH
 
     if (sf.headers != NULL)
         iov_cleanup(sf.headers, hbuf, sf.hdr_cnt);
@@ -8401,9 +8418,13 @@ static int
 os_isatty_impl(PyModuleDef *module, int fd)
 /*[clinic end generated code: output=acec9d3c29d16d33 input=08ce94aa1eaf7b5e]*/
 {
+    int return_value;
     if (!_PyVerify_fd(fd))
         return 0;
-    return isatty(fd);
+    _Py_BEGIN_SUPPRESS_IPH
+    return_value = isatty(fd);
+    _Py_END_SUPPRESS_IPH
+    return return_value;
 }
 
 
@@ -8598,7 +8619,9 @@ os_pwrite_impl(PyModuleDef *module, int fd, Py_buffer *buffer, Py_off_t offset)
 
     do {
         Py_BEGIN_ALLOW_THREADS
+        _Py_BEGIN_SUPPRESS_IPH
         size = pwrite(fd, buffer->buf, (size_t)buffer->len, offset);
+        _Py_END_SUPPRESS_IPH
         Py_END_ALLOW_THREADS
     } while (size < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
 
@@ -11193,12 +11216,16 @@ static int
 os_get_inheritable_impl(PyModuleDef *module, int fd)
 /*[clinic end generated code: output=36110bb36efaa21e input=89ac008dc9ab6b95]*/
 {
-    if (!_PyVerify_fd(fd)){
+    int return_value;
+    if (!_PyVerify_fd(fd)) {
         posix_error();
         return -1;
     }
 
-    return _Py_get_inheritable(fd);
+    _Py_BEGIN_SUPPRESS_IPH
+    return_value = _Py_get_inheritable(fd);
+    _Py_END_SUPPRESS_IPH
+    return return_value;
 }
 
 
@@ -11215,10 +11242,14 @@ static PyObject *
 os_set_inheritable_impl(PyModuleDef *module, int fd, int inheritable)
 /*[clinic end generated code: output=2ac5c6ce8623f045 input=9ceaead87a1e2402]*/
 {
+    int result;
     if (!_PyVerify_fd(fd))
         return posix_error();
 
-    if (_Py_set_inheritable(fd, inheritable, NULL) < 0)
+    _Py_BEGIN_SUPPRESS_IPH
+    result = _Py_set_inheritable(fd, inheritable, NULL);
+    _Py_END_SUPPRESS_IPH
+    if (result < 0)
         return NULL;
     Py_RETURN_NONE;
 }
@@ -11289,7 +11320,9 @@ posix_get_blocking(PyObject *self, PyObject *args)
     if (!_PyVerify_fd(fd))
         return posix_error();
 
+    _Py_BEGIN_SUPPRESS_IPH
     blocking = _Py_get_blocking(fd);
+    _Py_END_SUPPRESS_IPH
     if (blocking < 0)
         return NULL;
     return PyBool_FromLong(blocking);
@@ -11305,7 +11338,7 @@ PyDoc_STRVAR(set_blocking__doc__,
 static PyObject*
 posix_set_blocking(PyObject *self, PyObject *args)
 {
-    int fd, blocking;
+    int fd, blocking, result;
 
     if (!PyArg_ParseTuple(args, "ii:set_blocking", &fd, &blocking))
         return NULL;
@@ -11313,7 +11346,10 @@ posix_set_blocking(PyObject *self, PyObject *args)
     if (!_PyVerify_fd(fd))
         return posix_error();
 
-    if (_Py_set_blocking(fd, blocking) < 0)
+    _Py_BEGIN_SUPPRESS_IPH
+    result = _Py_set_blocking(fd, blocking);
+    _Py_END_SUPPRESS_IPH
+    if (result < 0)
         return NULL;
     Py_RETURN_NONE;
 }
diff --git a/PC/invalid_parameter_handler.c b/PC/invalid_parameter_handler.c
index 3bc0104f8dd..d634710cbec 100644
--- a/PC/invalid_parameter_handler.c
+++ b/PC/invalid_parameter_handler.c
@@ -15,8 +15,8 @@ static void __cdecl _silent_invalid_parameter_handler(
     unsigned int line,
     uintptr_t pReserved) { }
 
-void *_Py_silent_invalid_parameter_handler =
-    (void*)_silent_invalid_parameter_handler;
+_invalid_parameter_handler _Py_silent_invalid_parameter_handler = _silent_invalid_parameter_handler;
+
 #endif
 
 #endif
diff --git a/PC/msvcrtmodule.c b/PC/msvcrtmodule.c
index 18dec6dbe86..c8345c524ef 100644
--- a/PC/msvcrtmodule.c
+++ b/PC/msvcrtmodule.c
@@ -149,7 +149,9 @@ msvcrt_get_osfhandle(PyObject *self, PyObject *args)
     if (!_PyVerify_fd(fd))
         return PyErr_SetFromErrno(PyExc_IOError);
 
+    _Py_BEGIN_SUPPRESS_IPH
     handle = _get_osfhandle(fd);
+    _Py_END_SUPPRESS_IPH
     if (handle == -1)
         return PyErr_SetFromErrno(PyExc_IOError);
 
diff --git a/Python/fileutils.c b/Python/fileutils.c
index 64368f356f3..bccd32145c6 100644
--- a/Python/fileutils.c
+++ b/Python/fileutils.c
@@ -5,6 +5,7 @@
 #ifdef MS_WINDOWS
 #  include <malloc.h>
 #  include <windows.h>
+extern int winerror_to_errno(int);
 #endif
 
 #ifdef HAVE_LANGINFO_H
@@ -41,9 +42,13 @@ _Py_device_encoding(int fd)
 #if defined(MS_WINDOWS)
     UINT cp;
 #endif
-    if (!_PyVerify_fd(fd) || !isatty(fd)) {
+    int valid;
+    _Py_BEGIN_SUPPRESS_IPH
+    valid = _PyVerify_fd(fd) && isatty(fd);
+    _Py_END_SUPPRESS_IPH
+    if (!valid)
         Py_RETURN_NONE;
-    }
+
 #if defined(MS_WINDOWS)
     if (fd == 0)
         cp = GetConsoleCP();
@@ -610,16 +615,15 @@ _Py_fstat_noraise(int fd, struct _Py_stat_struct *status)
 
     if (!_PyVerify_fd(fd))
         h = INVALID_HANDLE_VALUE;
-    else
+    else {
+        _Py_BEGIN_SUPPRESS_IPH
         h = (HANDLE)_get_osfhandle(fd);
-
-    /* Protocol violation: we explicitly clear errno, instead of
-       setting it to a POSIX error. Callers should use GetLastError. */
-    errno = 0;
+        _Py_END_SUPPRESS_IPH
+    }
 
     if (h == INVALID_HANDLE_VALUE) {
-        /* This is really a C library error (invalid file handle).
-           We set the Win32 error to the closes one matching. */
+        /* errno is already set by _get_osfhandle, but we also set
+           the Win32 error for callers who expect that */
         SetLastError(ERROR_INVALID_HANDLE);
         return -1;
     }
@@ -628,8 +632,10 @@ _Py_fstat_noraise(int fd, struct _Py_stat_struct *status)
     type = GetFileType(h);
     if (type == FILE_TYPE_UNKNOWN) {
         DWORD error = GetLastError();
-        if (error != 0)
+        if (error != 0) {
+            errno = winerror_to_errno(error);
             return -1;
+        }
         /* else: valid but unknown file */
     }
 
@@ -642,6 +648,9 @@ _Py_fstat_noraise(int fd, struct _Py_stat_struct *status)
     }
 
     if (!GetFileInformationByHandle(h, &info)) {
+        /* The Win32 error is already set, but we also set errno for
+           callers who expect it */
+        errno = winerror_to_errno(GetLastError());
         return -1;
     }
 
@@ -735,7 +744,9 @@ get_inheritable(int fd, int raise)
         return -1;
     }
 
+    _Py_BEGIN_SUPPRESS_IPH
     handle = (HANDLE)_get_osfhandle(fd);
+    _Py_END_SUPPRESS_IPH
     if (handle == INVALID_HANDLE_VALUE) {
         if (raise)
             PyErr_SetFromErrno(PyExc_OSError);
@@ -810,7 +821,9 @@ set_inheritable(int fd, int inheritable, int raise, int *atomic_flag_works)
         return -1;
     }
 
+    _Py_BEGIN_SUPPRESS_IPH
     handle = (HANDLE)_get_osfhandle(fd);
+    _Py_END_SUPPRESS_IPH
     if (handle == INVALID_HANDLE_VALUE) {
         if (raise)
             PyErr_SetFromErrno(PyExc_OSError);
@@ -1171,6 +1184,7 @@ _Py_read(int fd, void *buf, size_t count)
     }
 #endif
 
+    _Py_BEGIN_SUPPRESS_IPH
     do {
         Py_BEGIN_ALLOW_THREADS
         errno = 0;
@@ -1185,6 +1199,7 @@ _Py_read(int fd, void *buf, size_t count)
         Py_END_ALLOW_THREADS
     } while (n < 0 && err == EINTR &&
             !(async_err = PyErr_CheckSignals()));
+    _Py_END_SUPPRESS_IPH
 
     if (async_err) {
         /* read() was interrupted by a signal (failed with EINTR)
@@ -1219,6 +1234,7 @@ _Py_write_impl(int fd, const void *buf, size_t count, int gil_held)
         return -1;
     }
 
+    _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
     if (count > 32767 && isatty(fd)) {
         /* Issue #11395: the Windows console returns an error (12: not
@@ -1264,6 +1280,7 @@ _Py_write_impl(int fd, const void *buf, size_t count, int gil_held)
             err = errno;
         } while (n < 0 && err == EINTR);
     }
+    _Py_END_SUPPRESS_IPH
 
     if (async_err) {
         /* write() was interrupted by a signal (failed with EINTR)
@@ -1451,7 +1468,9 @@ _Py_dup(int fd)
     }
 
 #ifdef MS_WINDOWS
+    _Py_BEGIN_SUPPRESS_IPH
     handle = (HANDLE)_get_osfhandle(fd);
+    _Py_END_SUPPRESS_IPH
     if (handle == INVALID_HANDLE_VALUE) {
         PyErr_SetFromErrno(PyExc_OSError);
         return -1;
@@ -1461,7 +1480,9 @@ _Py_dup(int fd)
     ftype = GetFileType(handle);
 
     Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
     fd = dup(fd);
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     if (fd < 0) {
         PyErr_SetFromErrno(PyExc_OSError);
@@ -1471,13 +1492,17 @@ _Py_dup(int fd)
     /* Character files like console cannot be make non-inheritable */
     if (ftype != FILE_TYPE_CHAR) {
         if (_Py_set_inheritable(fd, 0, NULL) < 0) {
+            _Py_BEGIN_SUPPRESS_IPH
             close(fd);
+            _Py_END_SUPPRESS_IPH
             return -1;
         }
     }
 #elif defined(HAVE_FCNTL_H) && defined(F_DUPFD_CLOEXEC)
     Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
     fd = fcntl(fd, F_DUPFD_CLOEXEC, 0);
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     if (fd < 0) {
         PyErr_SetFromErrno(PyExc_OSError);
@@ -1486,7 +1511,9 @@ _Py_dup(int fd)
 
 #else
     Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
     fd = dup(fd);
+    _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     if (fd < 0) {
         PyErr_SetFromErrno(PyExc_OSError);
@@ -1494,7 +1521,9 @@ _Py_dup(int fd)
     }
 
     if (_Py_set_inheritable(fd, 0, NULL) < 0) {
+        _Py_BEGIN_SUPPRESS_IPH
         close(fd);
+        _Py_END_SUPPRESS_IPH
         return -1;
     }
 #endif
@@ -1508,7 +1537,10 @@ _Py_dup(int fd)
 int
 _Py_get_blocking(int fd)
 {
-    int flags = fcntl(fd, F_GETFL, 0);
+    int flags;
+    _Py_BEGIN_SUPPRESS_IPH
+    flags = fcntl(fd, F_GETFL, 0);
+    _Py_END_SUPPRESS_IPH
     if (flags < 0) {
         PyErr_SetFromErrno(PyExc_OSError);
         return -1;
@@ -1533,16 +1565,20 @@ _Py_set_blocking(int fd, int blocking)
 #else
     int flags, res;
 
+    _Py_BEGIN_SUPPRESS_IPH
     flags = fcntl(fd, F_GETFL, 0);
-    if (flags < 0)
-        goto error;
+    if (flags >= 0) {
+        if (blocking)
+            flags = flags & (~O_NONBLOCK);
+        else
+            flags = flags | O_NONBLOCK;
 
-    if (blocking)
-        flags = flags & (~O_NONBLOCK);
-    else
-        flags = flags | O_NONBLOCK;
+        res = fcntl(fd, F_SETFL, flags);
+    } else {
+        res = -1;
+    }
+    _Py_END_SUPPRESS_IPH
 
-    res = fcntl(fd, F_SETFL, flags);
     if (res < 0)
         goto error;
 #endif
@@ -1554,25 +1590,7 @@ error:
 }
 #endif
 
-#ifdef _MSC_VER
-#if _MSC_VER >= 1900
-
-/* This function lets the Windows CRT validate the file handle without
-   terminating the process if it's invalid. */
-int
-_PyVerify_fd(int fd)
-{
-    intptr_t osh;
-    /* Fast check for the only condition we know */
-    if (fd < 0) {
-        _set_errno(EBADF);
-        return 0;
-    }
-    osh = _get_osfhandle(fd);
-    return osh != (intptr_t)-1;
-}
-
-#elif _MSC_VER >= 1400
+#if defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900
 /* Legacy implementation of _PyVerify_fd while transitioning to
  * MSVC 14.0. This should eventually be removed. (issue23524)
  */
@@ -1651,5 +1669,4 @@ _PyVerify_fd(int fd)
     return 0;
 }
 
-#endif /* _MSC_VER >= 1900 || _MSC_VER >= 1400 */
-#endif /* defined _MSC_VER */
+#endif /* defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900 */
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index e5645494e63..56186778f46 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -1068,11 +1068,12 @@ is_valid_fd(int fd)
     int dummy_fd;
     if (fd < 0 || !_PyVerify_fd(fd))
         return 0;
+    _Py_BEGIN_SUPPRESS_IPH
     dummy_fd = dup(fd);
-    if (dummy_fd < 0)
-        return 0;
-    close(dummy_fd);
-    return 1;
+    if (dummy_fd >= 0)
+        close(dummy_fd);
+    _Py_END_SUPPRESS_IPH
+    return dummy_fd >= 0;
 }
 
 /* Initialize sys.stdin, stdout, stderr and builtins.open */
diff --git a/Python/pystate.c b/Python/pystate.c
index 926ef07e211..32a635c789e 100644
--- a/Python/pystate.c
+++ b/Python/pystate.c
@@ -22,12 +22,6 @@ to avoid the expense of doing their own locking).
 #endif
 #endif
 
-#if defined _MSC_VER && _MSC_VER >= 1900
-/* Issue #23524: Temporary fix to disable termination due to invalid parameters */
-PyAPI_DATA(void*) _Py_silent_invalid_parameter_handler;
-#include <stdlib.h>
-#endif
-
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -228,11 +222,6 @@ new_threadstate(PyInterpreterState *interp, int init)
             tstate->next->prev = tstate;
         interp->tstate_head = tstate;
         HEAD_UNLOCK();
-
-#if defined _MSC_VER && _MSC_VER >= 1900
-        /* Issue #23524: Temporary fix to disable termination due to invalid parameters */
-        _set_thread_local_invalid_parameter_handler((_invalid_parameter_handler)_Py_silent_invalid_parameter_handler);
-#endif
     }
 
     return tstate;
diff --git a/Python/traceback.c b/Python/traceback.c
index d69feb95fd8..71ffecd74ab 100644
--- a/Python/traceback.c
+++ b/Python/traceback.c
@@ -717,6 +717,7 @@ _Py_DumpTracebackThreads(int fd, PyInterpreterState *interp,
     /* Dump the traceback of each thread */
     tstate = PyInterpreterState_ThreadHead(interp);
     nthreads = 0;
+    _Py_BEGIN_SUPPRESS_IPH
     do
     {
         if (nthreads != 0)
@@ -730,6 +731,7 @@ _Py_DumpTracebackThreads(int fd, PyInterpreterState *interp,
         tstate = PyThreadState_Next(tstate);
         nthreads++;
     } while (tstate != NULL);
+    _Py_END_SUPPRESS_IPH
 
     return NULL;
 }