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bpo-32381: Fix PyRun_SimpleFileExFlags() encoding (GH-23642) 

Fix encoding name when running a ".pyc" file on Windows:
PyRun_SimpleFileExFlags() now uses the correct encoding to decode the
filename.

* Add pyrun_file() subfunction.
* Add pyrun_simple_file() subfunction.
* PyRun_SimpleFileExFlags() now calls _Py_fopen_obj() rather than
  _Py_fopen().
This commit is contained in:
Victor Stinner 2020-12-08 14:38:08 +01:00 committed by GitHub
parent 233fddfe39
commit b6d98c10ff
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 138 additions and 95 deletions
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3
Misc/NEWS.d/next/Core and Builtins/2020-12-04-17-17-44.bpo-32381.NY5t2S.rst Normal file
View File

@ -0,0 +1,3 @@
Fix encoding name when running a ``.pyc`` file on Windows:
:c:func:`PyRun_SimpleFileExFlags()` now uses the correct encoding to decode
the filename.

230
Python/pythonrun.c
View File

@ -59,9 +59,13 @@ extern "C" {
static void flush_io(void);
static PyObject *run_mod(mod_ty, PyObject *, PyObject *, PyObject *,
PyCompilerFlags *, PyArena *);
static PyObject *run_pyc_file(FILE *, const char *, PyObject *, PyObject *,
static PyObject *run_pyc_file(FILE *, PyObject *, PyObject *,
PyCompilerFlags *);
static int PyRun_InteractiveOneObjectEx(FILE *, PyObject *, PyCompilerFlags *);
static PyObject* pyrun_file(FILE *fp, PyObject *filename, int start,
PyObject *globals, PyObject *locals, int closeit,
PyCompilerFlags *flags);
/* Parse input from a file and execute it */
int
@ -269,82 +273,89 @@ PyRun_InteractiveOneFlags(FILE *fp, const char *filename_str, PyCompilerFlags *f
the file type, and, if we may close it, at the first few bytes. */
static int
maybe_pyc_file(FILE *fp, const char* filename, const char* ext, int closeit)
maybe_pyc_file(FILE *fp, PyObject *filename, int closeit)
{
if (strcmp(ext, ".pyc") == 0)
PyObject *ext = PyUnicode_FromString(".pyc");
if (ext == NULL) {
return -1;
}
Py_ssize_t endswith = PyUnicode_Tailmatch(filename, ext, 0, PY_SSIZE_T_MAX, +1);
Py_DECREF(ext);
if (endswith) {
return 1;
}
/* Only look into the file if we are allowed to close it, since
it then should also be seekable. */
if (closeit) {
/* Read only two bytes of the magic. If the file was opened in
text mode, the bytes 3 and 4 of the magic (\r\n) might not
be read as they are on disk. */
unsigned int halfmagic = PyImport_GetMagicNumber() & 0xFFFF;
unsigned char buf[2];
/* Mess: In case of -x, the stream is NOT at its start now,
and ungetc() was used to push back the first newline,
which makes the current stream position formally undefined,
and a x-platform nightmare.
Unfortunately, we have no direct way to know whether -x
was specified. So we use a terrible hack: if the current
stream position is not 0, we assume -x was specified, and
give up. Bug 132850 on SourceForge spells out the
hopelessness of trying anything else (fseek and ftell
don't work predictably x-platform for text-mode files).
*/
int ispyc = 0;
if (ftell(fp) == 0) {
if (fread(buf, 1, 2, fp) == 2 &&
((unsigned int)buf[1]<<8 | buf[0]) == halfmagic)
ispyc = 1;
rewind(fp);
}
return ispyc;
if (!closeit) {
return 0;
}
return 0;
/* Read only two bytes of the magic. If the file was opened in
text mode, the bytes 3 and 4 of the magic (\r\n) might not
be read as they are on disk. */
unsigned int halfmagic = PyImport_GetMagicNumber() & 0xFFFF;
unsigned char buf[2];
/* Mess: In case of -x, the stream is NOT at its start now,
and ungetc() was used to push back the first newline,
which makes the current stream position formally undefined,
and a x-platform nightmare.
Unfortunately, we have no direct way to know whether -x
was specified. So we use a terrible hack: if the current
stream position is not 0, we assume -x was specified, and
give up. Bug 132850 on SourceForge spells out the
hopelessness of trying anything else (fseek and ftell
don't work predictably x-platform for text-mode files).
*/
int ispyc = 0;
if (ftell(fp) == 0) {
if (fread(buf, 1, 2, fp) == 2 &&
((unsigned int)buf[1]<<8 | buf[0]) == halfmagic)
ispyc = 1;
rewind(fp);
}
return ispyc;
}
static int
set_main_loader(PyObject *d, const char *filename, const char *loader_name)
{
PyObject *filename_obj, *bootstrap, *loader_type = NULL, *loader;
int result = 0;
filename_obj = PyUnicode_DecodeFSDefault(filename);
if (filename_obj == NULL)
return -1;
static int
set_main_loader(PyObject *d, PyObject *filename, const char *loader_name)
{
PyInterpreterState *interp = _PyInterpreterState_GET();
bootstrap = PyObject_GetAttrString(interp->importlib,
"_bootstrap_external");
if (bootstrap != NULL) {
loader_type = PyObject_GetAttrString(bootstrap, loader_name);
Py_DECREF(bootstrap);
}
if (loader_type == NULL) {
Py_DECREF(filename_obj);
PyObject *bootstrap = PyObject_GetAttrString(interp->importlib,
"_bootstrap_external");
if (bootstrap == NULL) {
return -1;
}
loader = PyObject_CallFunction(loader_type, "sN", "__main__", filename_obj);
PyObject *loader_type = PyObject_GetAttrString(bootstrap, loader_name);
Py_DECREF(bootstrap);
if (loader_type == NULL) {
return -1;
}
PyObject *loader = PyObject_CallFunction(loader_type,
"sO", "__main__", filename);
Py_DECREF(loader_type);
if (loader == NULL) {
return -1;
}
if (PyDict_SetItemString(d, "__loader__", loader) < 0) {
result = -1;
Py_DECREF(loader);
return -1;
}
Py_DECREF(loader);
return result;
return 0;
}
int
PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,
PyCompilerFlags *flags)
static int
pyrun_simple_file(FILE *fp, PyObject *filename, int closeit,
PyCompilerFlags *flags)
{
PyObject *m, *d, *v;
const char *ext;
int set_file_name = 0, ret = -1;
size_t len;
m = PyImport_AddModule("__main__");
if (m == NULL)
@ -355,29 +366,29 @@ PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,
if (PyErr_Occurred()) {
goto done;
}
PyObject *f;
f = PyUnicode_DecodeFSDefault(filename);
if (f == NULL)
goto done;
if (PyDict_SetItemString(d, "__file__", f) < 0) {
Py_DECREF(f);
if (PyDict_SetItemString(d, "__file__", filename) < 0) {
goto done;
}
if (PyDict_SetItemString(d, "__cached__", Py_None) < 0) {
Py_DECREF(f);
goto done;
}
set_file_name = 1;
Py_DECREF(f);
}
len = strlen(filename);
ext = filename + len - (len > 4 ? 4 : 0);
if (maybe_pyc_file(fp, filename, ext, closeit)) {
int pyc = maybe_pyc_file(fp, filename, closeit);
if (pyc < 0) {
goto done;
}
if (pyc) {
FILE *pyc_fp;
/* Try to run a pyc file. First, re-open in binary */
if (closeit)
if (closeit) {
fclose(fp);
if ((pyc_fp = _Py_fopen(filename, "rb")) == NULL) {
}
pyc_fp = _Py_fopen_obj(filename, "rb");
if (pyc_fp == NULL) {
fprintf(stderr, "python: Can't reopen .pyc file\n");
goto done;
}
@ -388,17 +399,17 @@ PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,
fclose(pyc_fp);
goto done;
}
v = run_pyc_file(pyc_fp, filename, d, d, flags);
v = run_pyc_file(pyc_fp, d, d, flags);
} else {
/* When running from stdin, leave __main__.__loader__ alone */
if (strcmp(filename, "<stdin>") != 0 &&
if (PyUnicode_CompareWithASCIIString(filename, "<stdin>") != 0 &&
set_main_loader(d, filename, "SourceFileLoader") < 0) {
fprintf(stderr, "python: failed to set __main__.__loader__\n");
ret = -1;
goto done;
}
v = PyRun_FileExFlags(fp, filename, Py_file_input, d, d,
closeit, flags);
v = pyrun_file(fp, filename, Py_file_input, d, d,
closeit, flags);
}
flush_io();
if (v == NULL) {
@ -421,6 +432,21 @@ PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,
return ret;
}
int
PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit,
PyCompilerFlags *flags)
{
PyObject *filename_obj = PyUnicode_DecodeFSDefault(filename);
if (filename_obj == NULL) {
return -1;
}
int res = pyrun_simple_file(fp, filename_obj, closeit, flags);
Py_DECREF(filename_obj);
return res;
}
int
PyRun_SimpleStringFlags(const char *command, PyCompilerFlags *flags)
{
@ -1039,40 +1065,54 @@ PyRun_StringFlags(const char *str, int start, PyObject *globals,
return ret;
}
PyObject *
PyRun_FileExFlags(FILE *fp, const char *filename_str, int start, PyObject *globals,
PyObject *locals, int closeit, PyCompilerFlags *flags)
static PyObject *
pyrun_file(FILE *fp, PyObject *filename, int start, PyObject *globals,
PyObject *locals, int closeit, PyCompilerFlags *flags)
{
PyObject *ret = NULL;
PyArena *arena = PyArena_New();
if (arena == NULL) {
return NULL;
}
mod_ty mod;
PyArena *arena = NULL;
PyObject *filename;
filename = PyUnicode_DecodeFSDefault(filename_str);
if (filename == NULL)
goto exit;
arena = PyArena_New();
if (arena == NULL)
goto exit;
mod = PyParser_ASTFromFileObject(fp, filename, NULL, start, NULL, NULL,
flags, NULL, arena);
if (closeit)
if (closeit) {
fclose(fp);
if (mod == NULL) {
goto exit;
}
ret = run_mod(mod, filename, globals, locals, flags, arena);
exit:
Py_XDECREF(filename);
if (arena != NULL)
PyArena_Free(arena);
PyObject *ret;
if (mod != NULL) {
ret = run_mod(mod, filename, globals, locals, flags, arena);
}
else {
ret = NULL;
}
PyArena_Free(arena);
return ret;
}
PyObject *
PyRun_FileExFlags(FILE *fp, const char *filename, int start, PyObject *globals,
PyObject *locals, int closeit, PyCompilerFlags *flags)
{
PyObject *filename_obj = PyUnicode_DecodeFSDefault(filename);
if (filename_obj == NULL) {
return NULL;
}
PyObject *res = pyrun_file(fp, filename_obj, start, globals,
locals, closeit, flags);
Py_DECREF(filename_obj);
return res;
}
static void
flush_io(void)
{
@ -1155,8 +1195,8 @@ run_mod(mod_ty mod, PyObject *filename, PyObject *globals, PyObject *locals,
}
static PyObject *
run_pyc_file(FILE *fp, const char *filename, PyObject *globals,
PyObject *locals, PyCompilerFlags *flags)
run_pyc_file(FILE *fp, PyObject *globals, PyObject *locals,
PyCompilerFlags *flags)
{
PyThreadState *tstate = _PyThreadState_GET();
PyCodeObject *co;