10000 gh-111178: fix UBSan failures in `Modules/_ssl.c` by picnixz · Pull Request #130719 · python/cpython · GitHub
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gh-111178: fix UBSan failures in Modules/_ssl.c #130719

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Merged
merged 10 commits into from
Mar 17, 2025
Merged

gh-111178: fix UBSan failures in Modules/_ssl.c #130719

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801a41c
fix UBSan failures for `PySSLContext`
picnixz Feb 8, 2025
e1c5020
fix UBSan failures for `PySSLSocket`
picnixz Feb 8, 2025
e101a98
fix UBSan failures for `PySSLMemoryBIO`
picnixz Feb 8, 2025
d734c1e
fix UBSan failures for `PySSLSession`
picnixz Feb 8, 2025
fe9f918
Do not use `_` + capital letter in cast macros as it is also UB.
picnixz Feb 8, 2025
9a88242
Merge remote-tracking branch 'upstream/main' into fix/ubsan/ssl-111178
picnixz Mar 1, 2025
58d5d42
Merge remote-tracking branch 'upstream/main' into fix/ubsan/ssl-111178
picnixz Mar 1, 2025
62cfada
Assume (and then assert, a bit too late) that left is of the right type
encukou Mar 5, 2025
dc0a521
Victor's review (part 1)
picnixz Mar 16, 2025
9a4079c
Update Modules/_ssl.c
picnixz Mar 16, 2025
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fix UBSan failures for PySSLContext
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@picnixz
picnixz committed Feb 8, 2025
commit 801a41c7c927ea310808a0f0bfdfa881f8fa5209
35 changes: 22 additions & 13 deletions Modules/_ssl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -312,6 +312,8 @@ typedef struct {
#endif
} PySSLContext;

#define PySSLContext_CAST(op) ((PySSLContext *)(op))

typedef struct {
int ssl; /* last seen error from SSL */
int c; /* last seen error from libc */
Expand Down Expand Up @@ -3278,17 +3280,19 @@ _ssl__SSLContext_impl(PyTypeObject *type, int proto_version)
}

static int
context_traverse(PySSLContext *self, visitproc visit, void *arg)
context_traverse(PyObject *op, visitproc visit, void *arg)
{
PySSLContext *self = PySSLContext_CAST(op);
Py_VISIT(self->set_sni_cb);
Py_VISIT(self->msg_cb);
Py_VISIT(Py_TYPE(self));
return 0;
}

static int
context_clear(PySSLContext *self)
context_clear(PyObject *op)
{
PySSLContext *self = PySSLContext_CAST(op);
Py_CLEAR(self->set_sni_cb);
Py_CLEAR(self->msg_cb);
Py_CLEAR(self->keylog_filename);
Expand All @@ -3306,15 +3310,16 @@ context_clear(PySSLContext *self)
}

static void
context_dealloc(PySSLContext *self)
context_dealloc(PyObject *op)
{
PySSLContext *self = PySSLContext_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
/* bpo-31095: UnTrack is needed before calling any callbacks */
PyObject_GC_UnTrack(self);
context_clear(self);
(void)context_clear(op);
SSL_CTX_free(self->ctx);
PyMem_FREE(self->alpn_protocols);
Py_TYPE(self)->tp_free(self);
tp->tp_free(self);
Py_DECREF(tp);
}

Expand Down Expand Up @@ -3908,7 +3913,9 @@ _ssl__SSLContext_check_hostname_set_impl(PySSLContext *self, PyObject *value)
}

static PyObject *
get_post_handshake_auth(PySSLContext *self, void *c) {
get_post_handshake_auth(PyObject *op, void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
#if defined(PySSL_HAVE_POST_HS_AUTH)
return PyBool_FromLong(self->post_handshake_auth);
#else
Expand All @@ -3918,7 +3925,9 @@ get_post_handshake_auth(PySSLContext *self, void *c) {

#if defined(PySSL_HAVE_POST_HS_AUTH)
static int
set_post_handshake_auth(PySSLContext *self, PyObject *arg, void *c) {
set_post_handshake_auth(PyObject *op, PyObject *arg, void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
if (arg == NULL) {
PyErr_SetString(PyExc_AttributeError, "cannot delete attribute");
return -1;
Expand Down Expand Up @@ -5197,18 +5206,18 @@ static PyGetSetDef context_getsetlist[] = {
_SSL__SSLCONTEXT__HOST_FLAGS_GETSETDEF
_SSL__SSLCONTEXT_MINIMUM_VERSION_GETSETDEF
_SSL__SSLCONTEXT_MAXIMUM_VERSION_GETSETDEF
{"keylog_filename", (getter) _PySSLContext_get_keylog_filename,
(setter) _PySSLContext_set_keylog_filename, NULL},
{"_msg_callback", (getter) _PySSLContext_get_msg_callback,
(setter) _PySSLContext_set_msg_callback, NULL},
{"keylog_filename", _PySSLContext_get_keylog_filename,
_PySSLContext_set_keylog_filename, NULL},
{"_msg_callback", _PySSLContext_get_msg_callback,
_PySSLContext_set_msg_callback, NULL},
_SSL__SSLCONTEXT_SNI_CALLBACK_GETSETDEF
#if defined(TLS1_3_VERSION) && !defined(OPENSSL_NO_TLS1_3)
_SSL__SSLCONTEXT_NUM_TICKETS_GETSETDEF
#endif
_SSL__SSLCONTEXT_OPTIONS_GETSETDEF
{"post_handshake_auth", (getter) get_post_handshake_auth,
{"post_handshake_auth", get_post_handshake_auth,
#if defined(PySSL_HAVE_POST_HS_AUTH)
(setter) set_post_handshake_auth,
set_post_handshake_auth,
#else
NULL,
#endif
Expand Down
18 changes: 14 additions & 4 deletions Modules/_ssl/debughelpers.c
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,9 @@ _PySSL_msg_callback(int write_p, int version, int content_type,


static PyObject *
_PySSLContext_get_msg_callback(PySSLContext *self, void *c) {
_PySSLContext_get_msg_callback(PyObject *op, void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
if (self->msg_cb != NULL) {
return Py_NewRef(self->msg_cb);
} else {
Expand All @@ -94,7 +96,10 @@ _PySSLContext_get_msg_callback(PySSLContext *self, void *c) {
}

static int
_PySSLContext_set_msg_callback(PySSLContext *self, PyObject *arg, void *c) {
_PySSLContext_set_msg_callback(PyObject *op, PyObject *arg,
void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
Py_CLEAR(self->msg_cb);
if (arg == Py_None) {
SSL_CTX_set_msg_callback(self->ctx, NULL);
Expand Down Expand Up @@ -153,7 +158,9 @@ _PySSL_keylog_callback(const SSL *ssl, const char *line)
}

static PyObject *
_PySSLContext_get_keylog_filename(PySSLContext *self, void *c) {
_PySSLContext_get_keylog_filename(PyObject *op, void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
if (self->keylog_filename != NULL) {
return Py_NewRef(self->keylog_filename);
} else {
Expand All @@ -162,7 +169,10 @@ _PySSLContext_get_keylog_filename(PySSLContext *self, void *c) {
}

static int
_PySSLContext_set_keylog_filename(PySSLContext *self, PyObject *arg, void *c) {
_PySSLContext_set_keylog_filename(PyObject *op, PyObject *arg,
void *Py_UNUSED(closure))
{
PySSLContext *self = PySSLContext_CAST(op);
FILE *fp;
/* Reset variables and callback first */
SSL_CTX_set_keylog_callback(self->ctx, NULL);
Expand Down
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