Import upstream CPython branch '3.14'

Summary:
Python `3.14.0rc3+` (`3.14`) was **published** on 2025-09-27 06:12:11+00:00.

# Commit Info

Base: (`3.14.0rc3+`) - `c76fd771b5c19cf978c6cc9cdd403fb38ae14341` (commit date: 2025-09-24 17:11:20+00:00)
Imported: (`3.14.0rc3+`) - `3.14` (commit date: 2025-09-27 06:12:11+00:00)

# Files added

```
Misc/NEWS.d/next/Library/2025-09-25-07-33-43.gh-issue-139312.ygE8AC.rst
Misc/NEWS.d/next/Tools-Demos/2025-09-25-10-31-02.gh-issue-139330.5WWkY0.rst
```

Reviewed By: itamaro

Differential Revision: D83410028

fbshipit-source-id: cc7be260fb59e4883efc526475fef46bd156f154

Author: generatedunixname1734921407115435

Doc/library/ssl.rst

@@ -125,7 +125,8 @@ Context creation
 A convenience function helps create :class:`SSLContext` objects for common
 purposes.
 
-.. function:: create_default_context(purpose=Purpose.SERVER_AUTH, cafile=None, capath=None, cadata=None)
+.. function:: create_default_context(purpose=Purpose.SERVER_AUTH, *,\
+                                     cafile=None, capath=None, cadata=None)
 
    Return a new :class:`SSLContext` object with default settings for
    the given *purpose*.  The settings are chosen by the :mod:`ssl` module,
@@ -314,7 +315,7 @@ Exceptions
 Random generation
 ^^^^^^^^^^^^^^^^^
 
-.. function:: RAND_bytes(num)
+.. function:: RAND_bytes(num, /)
 
    Return *num* cryptographically strong pseudo-random bytes. Raises an
    :class:`SSLError` if the PRNG has not been seeded with enough data or if the
@@ -338,7 +339,7 @@ Random generation
    :func:`ssl.RAND_egd` and :func:`ssl.RAND_add` to increase the randomness of
    the pseudo-random number generator.
 
-.. function:: RAND_add(bytes, entropy)
+.. function:: RAND_add(bytes, entropy, /)
 
    Mix the given *bytes* into the SSL pseudo-random number generator.  The
    parameter *entropy* (a float) is a lower bound on the entropy contained in
@@ -406,12 +407,12 @@ Certificate handling
    .. versionchanged:: 3.10
       The *timeout* parameter was added.
 
-.. function:: DER_cert_to_PEM_cert(DER_cert_bytes)
+.. function:: DER_cert_to_PEM_cert(der_cert_bytes)
 
    Given a certificate as a DER-encoded blob of bytes, returns a PEM-encoded
    string version of the same certificate.
 
-.. function:: PEM_cert_to_DER_cert(PEM_cert_string)
+.. function:: PEM_cert_to_DER_cert(pem_cert_string)
 
    Given a certificate as an ASCII PEM string, returns a DER-encoded sequence of
    bytes for that same certificate.
@@ -1128,10 +1129,10 @@ SSL sockets also have the following additional methods and attributes:
    .. deprecated:: 3.6
       Use :meth:`~SSLSocket.recv` instead of :meth:`~SSLSocket.read`.
 
-.. method:: SSLSocket.write(buf)
+.. method:: SSLSocket.write(data)
 
-   Write *buf* to the SSL socket and return the number of bytes written. The
-   *buf* argument must be an object supporting the buffer interface.
+   Write *data* to the SSL socket and return the number of bytes written. The
+   *data* argument must be an object supporting the buffer interface.
 
    Raise :exc:`SSLWantReadError` or :exc:`SSLWantWriteError` if the socket is
    :ref:`non-blocking <ssl-nonblocking>` and the write would block.
@@ -1141,7 +1142,7 @@ SSL sockets also have the following additional methods and attributes:
 
    .. versionchanged:: 3.5
       The socket timeout is no longer reset each time bytes are received or sent.
-      The socket timeout is now the maximum total duration to write *buf*.
+      The socket timeout is now the maximum total duration to write *data*.
 
    .. deprecated:: 3.6
       Use :meth:`~SSLSocket.send` instead of :meth:`~SSLSocket.write`.
@@ -1158,12 +1159,15 @@ SSL sockets also have the following additional methods and attributes:
    :meth:`~socket.socket.recv` and :meth:`~socket.socket.send` instead of these
    methods.
 
-.. method:: SSLSocket.do_handshake()
+.. method:: SSLSocket.do_handshake(block=False)
 
    Perform the SSL setup handshake.
 
+   If *block* is true and the timeout obtained by :meth:`~socket.socket.gettimeout`
+   is zero, the socket is set in blocking mode until the handshake is performed.
+
    .. versionchanged:: 3.4
-      The handshake method also performs :func:`match_hostname` when the
+      The handshake method also performs :func:`!match_hostname` when the
       :attr:`~SSLContext.check_hostname` attribute of the socket's
       :attr:`~SSLSocket.context` is true.
 
@@ -1173,7 +1177,7 @@ SSL sockets also have the following additional methods and attributes:
 
    .. versionchanged:: 3.7
       Hostname or IP address is matched by OpenSSL during handshake. The
-      function :func:`match_hostname` is no longer used. In case OpenSSL
+      function :func:`!match_hostname` is no longer used. In case OpenSSL
       refuses a hostname or IP address, the handshake is aborted early and
       a TLS alert message is sent to the peer.
 
@@ -1643,7 +1647,7 @@ to speed up repeated connections from the same clients.
    provided as part of the operating system, though, it is likely to be
    configured properly.
 
-.. method:: SSLContext.set_ciphers(ciphers)
+.. method:: SSLContext.set_ciphers(ciphers, /)
 
    Set the available ciphers for sockets created with this context.
    It should be a string in the `OpenSSL cipher list format
@@ -1659,7 +1663,7 @@ to speed up repeated connections from the same clients.
       TLS 1.3 cipher suites cannot be disabled with
       :meth:`~SSLContext.set_ciphers`.
 
-.. method:: SSLContext.set_alpn_protocols(protocols)
+.. method:: SSLContext.set_alpn_protocols(alpn_protocols)
 
    Specify which protocols the socket should advertise during the SSL/TLS
    handshake. It should be a list of ASCII strings, like ``['http/1.1',
@@ -1673,7 +1677,7 @@ to speed up repeated connections from the same clients.
 
    .. versionadded:: 3.5
 
-.. method:: SSLContext.set_npn_protocols(protocols)
+.. method:: SSLContext.set_npn_protocols(npn_protocols)
 
    Specify which protocols the socket should advertise during the SSL/TLS
    handshake. It should be a list of strings, like ``['http/1.1', 'spdy/2']``,
@@ -1740,7 +1744,7 @@ to speed up repeated connections from the same clients.
 
    .. versionadded:: 3.7
 
-.. attribute:: SSLContext.set_servername_callback(server_name_callback)
+.. method:: SSLContext.set_servername_callback(server_name_callback)
 
    This is a legacy API retained for backwards compatibility. When possible,
    you should use :attr:`sni_callback` instead. The given *server_name_callback*
@@ -1754,7 +1758,7 @@ to speed up repeated connections from the same clients.
 
    .. versionadded:: 3.4
 
-.. method:: SSLContext.load_dh_params(dhfile)
+.. method:: SSLContext.load_dh_params(dhfile, /)
 
    Load the key generation parameters for Diffie-Hellman (DH) key exchange.
    Using DH key exchange improves forward secrecy at the expense of
@@ -1767,7 +1771,7 @@ to speed up repeated connections from the same clients.
 
    .. versionadded:: 3.3
 
-.. method:: SSLContext.set_ecdh_curve(curve_name)
+.. method:: SSLContext.set_ecdh_curve(curve_name, /)
 
    Set the curve name for Elliptic Curve-based Diffie-Hellman (ECDH) key
    exchange.  ECDH is significantly faster than regular DH while arguably
@@ -2641,12 +2645,12 @@ purpose.  It wraps an OpenSSL memory BIO (Basic IO) object:
       A boolean indicating whether the memory BIO is current at the end-of-file
       position.
 
-   .. method:: MemoryBIO.read(n=-1)
+   .. method:: MemoryBIO.read(n=-1, /)
 
       Read up to *n* bytes from the memory buffer. If *n* is not specified or
       negative, all bytes are returned.
 
-   .. method:: MemoryBIO.write(buf)
+   .. method:: MemoryBIO.write(buf, /)
 
       Write the bytes from *buf* to the memory BIO. The *buf* argument must be an
       object supporting the buffer protocol.
@@ -2729,7 +2733,7 @@ This common check is automatically performed when
 
 .. versionchanged:: 3.7
    Hostname matchings is now performed by OpenSSL. Python no longer uses
-   :func:`match_hostname`.
+   :func:`!match_hostname`.
 
 In server mode, if you want to authenticate your clients using the SSL layer
 (rather than using a higher-level authentication mechanism), you'll also have

Doc/library/xml.rst

@@ -55,7 +55,7 @@ An attacker can abuse XML features to carry out denial of service attacks,
 access local files, generate network connections to other machines, or
 circumvent firewalls.
 
-Expat versions lower that 2.6.0 may be vulnerable to "billion laughs",
+Expat versions lower than 2.6.0 may be vulnerable to "billion laughs",
 "quadratic blowup" and "large tokens". Python may be vulnerable if it uses such
 older versions of Expat as a system-provided library.
 Check :const:`!pyexpat.EXPAT_VERSION`.

Misc/NEWS.d/next/Library/2025-09-25-07-33-43.gh-issue-139312.ygE8AC.rst

@@ -0,0 +1 @@
+Upgrade bundled libexpat to 2.7.3

Misc/NEWS.d/next/Tools-Demos/2025-09-25-10-31-02.gh-issue-139330.5WWkY0.rst

@@ -0,0 +1,3 @@
+SBOM generation tool didn't cross-check the version and checksum values
+against the ``Modules/expat/refresh.sh`` script, leading to the values
+becoming out-of-date during routine updates.

Misc/sbom.spdx.json

@@ -19,6 +19,7 @@
    Copyright (c) 2023      Hanno Böck <hanno@gentoo.org>
    Copyright (c) 2023      Sony Corporation / Snild Dolkow <snild@sony.com>
    Copyright (c) 2024      Taichi Haradaguchi <20001722@ymail.ne.jp>
+   Copyright (c) 2025      Matthew Fernandez <matthew.fernandez@gmail.com>
    Licensed under the MIT license:
 
    Permission is  hereby granted,  free of charge,  to any  person obtaining
@@ -276,7 +277,7 @@ XML_ParserCreate_MM(const XML_Char *encoding,
 
 /* Prepare a parser object to be reused.  This is particularly
    valuable when memory allocation overhead is disproportionately high,
-   such as when a large number of small documnents need to be parsed.
+   such as when a large number of small documents need to be parsed.
    All handlers are cleared from the parser, except for the
    unknownEncodingHandler. The parser's external state is re-initialized
    except for the values of ns and ns_triplets.
@@ -1081,7 +1082,7 @@ XML_SetReparseDeferralEnabled(XML_Parser parser, XML_Bool enabled);
 */
 #  define XML_MAJOR_VERSION 2
 #  define XML_MINOR_VERSION 7
-#  define XML_MICRO_VERSION 2
+#  define XML_MICRO_VERSION 3
 
 #  ifdef __cplusplus
 }

Modules/expat/expat.h

@@ -108,6 +108,7 @@
 #endif
 
 #include <limits.h> // ULONG_MAX
+#include <stddef.h> // size_t
 
 #if defined(_WIN32)                                                            \
     && (! defined(__USE_MINGW_ANSI_STDIO)                                      \
@@ -153,6 +154,11 @@
 #define EXPAT_ALLOC_TRACKER_ACTIVATION_THRESHOLD_DEFAULT                       \
   67108864 // 64 MiB, 2^26
 
+// NOTE: If function expat_alloc was user facing, EXPAT_MALLOC_ALIGNMENT would
+//       have to take sizeof(long double) into account
+#define EXPAT_MALLOC_ALIGNMENT sizeof(long long) // largest parser (sub)member
+#define EXPAT_MALLOC_PADDING ((EXPAT_MALLOC_ALIGNMENT) - sizeof(size_t))
+
 /* NOTE END */
 
 #include "expat.h" // so we can use type XML_Parser below

Modules/expat/internal.h

@@ -12,9 +12,9 @@ fi
 
 # Update this when updating to a new version after verifying that the changes
 # the update brings in are good. These values are used for verifying the SBOM, too.
-expected_libexpat_tag="R_2_7_2"
-expected_libexpat_version="2.7.2"
-expected_libexpat_sha256="13d42a125897329bfeecab899cb9b5a3ec8c26072994b5cd4c41f28241f5bce7"
+expected_libexpat_tag="R_2_7_3"
+expected_libexpat_version="2.7.3"
+expected_libexpat_sha256="821ac9710d2c073eaf13e1b1895a9c9aa66c1157a99635c639fbff65cdbdd732"
 
 expat_dir="$(realpath "$(dirname -- "${BASH_SOURCE[0]}")")"
 cd ${expat_dir}