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gh-94938: Fix errror detection of unexpected keyword arguments (GH-94999)

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When keyword argument name is an instance of a str subclass with
overloaded methods __eq__ and __hash__, the former code could not find
the name of an extraneous keyword argument to report an error, and
_PyArg_UnpackKeywords() returned success without setting the
corresponding cell in the linearized arguments array. But since the number
of expected initialized cells is determined as the total number of passed
arguments, this lead to reading NULL as a keyword parameter value, that
caused SystemError or crash or other undesired behavior.
This commit is contained in:
Serhiy Storchaka 2022-07-28 07:40:36 +03:00 • committed by GitHub
parent 0fe645d6fd
commit ebad53a4dc
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 112 additions and 85 deletions
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142
Python/getargs.c
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@ -1502,6 +1502,50 @@ _PyArg_VaParseTupleAndKeywordsFast_SizeT(PyObject *args, PyObject *keywords,
return retval;
}
static void
error_unexpected_keyword_arg(PyObject *kwargs, PyObject *kwnames, PyObject *kwtuple, const char *fname)
{
/* make sure there are no extraneous keyword arguments */
Py_ssize_t j = 0;
while (1) {
PyObject *keyword;
if (kwargs != NULL) {
if (!PyDict_Next(kwargs, &j, &keyword, NULL))
break;
}
else {
if (j >= PyTuple_GET_SIZE(kwnames))
break;
keyword = PyTuple_GET_ITEM(kwnames, j);
j++;
}
if (!PyUnicode_Check(keyword)) {
PyErr_SetString(PyExc_TypeError,
"keywords must be strings");
return;
}
int match = PySequence_Contains(kwtuple, keyword);
if (match <= 0) {
if (!match) {
PyErr_Format(PyExc_TypeError,
"'%S' is an invalid keyword "
"argument for %.200s%s",
keyword,
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()");
}
return;
}
}
/* Something wrong happened. There are extraneous keyword arguments,
* but we don't know what. And we don't bother. */
PyErr_Format(PyExc_TypeError,
"invalid keyword argument for %.200s%s",
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()");
}
int
PyArg_ValidateKeywordArguments(PyObject *kwargs)
{
@ -1790,6 +1834,13 @@ vgetargskeywords(PyObject *args, PyObject *kwargs, const char *format,
return cleanreturn(0, &freelist);
}
}
/* Something wrong happened. There are extraneous keyword arguments,
* but we don't know what. And we don't bother. */
PyErr_Format(PyExc_TypeError,
"invalid keyword argument for %.200s%s",
(fname == NULL) ? "this function" : fname,
(fname == NULL) ? "" : "()");
return cleanreturn(0, &freelist);
}
return cleanreturn(1, &freelist);
@ -2132,7 +2183,6 @@ vgetargskeywordsfast_impl(PyObject *const *args, Py_ssize_t nargs,
assert(IS_END_OF_FORMAT(*format) || (*format == '|') || (*format == '$'));
if (nkwargs > 0) {
Py_ssize_t j;
/* make sure there are no arguments given by name and position */
for (i = pos; i < nargs; i++) {
keyword = PyTuple_GET_ITEM(kwtuple, i - pos);
@ -2156,34 +2206,9 @@ vgetargskeywordsfast_impl(PyObject *const *args, Py_ssize_t nargs,
return cleanreturn(0, &freelist);
}
}
/* make sure there are no extraneous keyword arguments */
j = 0;
while (1) {
int match;
if (kwargs != NULL) {
if (!PyDict_Next(kwargs, &j, &keyword, NULL))
break;
}
else {
if (j >= PyTuple_GET_SIZE(kwnames))
break;
keyword = PyTuple_GET_ITEM(kwnames, j);
j++;
}
match = PySequence_Contains(kwtuple, keyword);
if (match <= 0) {
if (!match) {
PyErr_Format(PyExc_TypeError,
"'%S' is an invalid keyword "
"argument for %.200s%s",
keyword,
(parser->fname == NULL) ? "this function" : parser->fname,
(parser->fname == NULL) ? "" : "()");
}
return cleanreturn(0, &freelist);
}
}
error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname);
return cleanreturn(0, &freelist);
}
return cleanreturn(1, &freelist);
@ -2357,7 +2382,6 @@ _PyArg_UnpackKeywords(PyObject *const *args, Py_ssize_t nargs,
}
if (nkwargs > 0) {
Py_ssize_t j;
/* make sure there are no arguments given by name and position */
for (i = posonly; i < nargs; i++) {
keyword = PyTuple_GET_ITEM(kwtuple, i - posonly);
@ -2381,34 +2405,9 @@ _PyArg_UnpackKeywords(PyObject *const *args, Py_ssize_t nargs,
return NULL;
}
}
/* make sure there are no extraneous keyword arguments */
j = 0;
while (1) {
int match;
if (kwargs != NULL) {
if (!PyDict_Next(kwargs, &j, &keyword, NULL))
break;
}
else {
if (j >= PyTuple_GET_SIZE(kwnames))
break;
keyword = PyTuple_GET_ITEM(kwnames, j);
j++;
}
match = PySequence_Contains(kwtuple, keyword);
if (match <= 0) {
if (!match) {
PyErr_Format(PyExc_TypeError,
"'%S' is an invalid keyword "
"argument for %.200s%s",
keyword,
(parser->fname == NULL) ? "this function" : parser->fname,
(parser->fname == NULL) ? "" : "()");
}
return NULL;
}
}
error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname);
return NULL;
}
return buf;
@ -2537,35 +2536,8 @@ _PyArg_UnpackKeywordsWithVararg(PyObject *const *args, Py_ssize_t nargs,
}
if (nkwargs > 0) {
Py_ssize_t j;
/* make sure there are no extraneous keyword arguments */
j = 0;
while (1) {
int match;
if (kwargs != NULL) {
if (!PyDict_Next(kwargs, &j, &keyword, NULL))
break;
}
else {
if (j >= PyTuple_GET_SIZE(kwnames))
break;
keyword = PyTuple_GET_ITEM(kwnames, j);
j++;
}
match = PySequence_Contains(kwtuple, keyword);
if (match <= 0) {
if (!match) {
PyErr_Format(PyExc_TypeError,
"'%S' is an invalid keyword "
"argument for %.200s%s",
keyword,
(parser->fname == NULL) ? "this function" : parser->fname,
(parser->fname == NULL) ? "" : "()");
}
goto exit;
}
}
error_unexpected_keyword_arg(kwargs, kwnames, kwtuple, parser->fname);
goto exit;
}
return buf;