diff options
Diffstat (limited to 'Python/pythonrun.c')
| -rw-r--r-- | Python/pythonrun.c | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/Python/pythonrun.c b/Python/pythonrun.c index 90cb2de..dd41a3a 100644 --- a/Python/pythonrun.c +++ b/Python/pythonrun.c @@ -259,6 +259,21 @@ PyRun_InteractiveOneFlags(FILE *fp, const char *filename_str, PyCompilerFlags *f } +/* Issue #29537: handle issue27286 bytecode incompatibility + * See Lib/importlib/_bootstrap_external.py for general discussion + */ +extern PY_UINT32_T _Py_BACKCOMPAT_HALF_MAGIC; +static int +_check_half_magic(unsigned int read_value, unsigned int halfmagic) { + return (read_value == halfmagic || read_value == _Py_BACKCOMPAT_HALF_MAGIC); +} + +extern PY_UINT32_T _Py_BACKCOMPAT_MAGIC_NUMBER; +static int +_check_magic(long read_value, long magic) { + return (read_value == magic || read_value == _Py_BACKCOMPAT_MAGIC_NUMBER); +} + /* Check whether a file maybe a pyc file: Look at the extension, the file type, and, if we may close it, at the first few bytes. */ @@ -290,7 +305,7 @@ maybe_pyc_file(FILE *fp, const char* filename, const char* ext, int closeit) int ispyc = 0; if (ftell(fp) == 0) { if (fread(buf, 1, 2, fp) == 2 && - ((unsigned int)buf[1]<<8 | buf[0]) == halfmagic) + _check_half_magic(((unsigned int)buf[1]<<8 | buf[0]), halfmagic)) ispyc = 1; rewind(fp); } @@ -988,7 +1003,7 @@ run_pyc_file(FILE *fp, const char *filename, PyObject *globals, long PyImport_GetMagicNumber(void); magic = PyMarshal_ReadLongFromFile(fp); - if (magic != PyImport_GetMagicNumber()) { + if (!_check_magic(magic, PyImport_GetMagicNumber())) { if (!PyErr_Occurred()) PyErr_SetString(PyExc_RuntimeError, "Bad magic number in .pyc file"); |