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bpo-22689: Copy the result of getenv() in sys_breakpointhook(). (GH-8194)

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Serhiy Storchaka 2018-07-09 21:46:51 +03:00 committed by GitHub
parent b796e7dcdc
commit f60bf0e168
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1 changed files with 14 additions and 1 deletions
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15
Python/sysmodule.c
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@ -107,7 +107,7 @@ static PyObject *
sys_breakpointhook(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyObject *keywords)
{
assert(!PyErr_Occurred());
const char *envar = Py_GETENV("PYTHONBREAKPOINT");
char *envar = Py_GETENV("PYTHONBREAKPOINT");
if (envar == NULL || strlen(envar) == 0) {
envar = "pdb.set_trace";
@ -116,6 +116,15 @@ sys_breakpointhook(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyOb
/* The breakpoint is explicitly no-op'd. */
Py_RETURN_NONE;
}
/* According to POSIX the string returned by getenv() might be invalidated
* or the string content might be overwritten by a subsequent call to
* getenv(). Since importing a module can performs the getenv() calls,
* we need to save a copy of envar. */
envar = _PyMem_RawStrdup(envar);
if (envar == NULL) {
PyErr_NoMemory();
return NULL;
}
const char *last_dot = strrchr(envar, '.');
const char *attrname = NULL;
PyObject *modulepath = NULL;
@ -131,12 +140,14 @@ sys_breakpointhook(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyOb
attrname = last_dot + 1;
}
if (modulepath == NULL) {
PyMem_RawFree(envar);
return NULL;
}
PyObject *fromlist = Py_BuildValue("(s)", attrname);
if (fromlist == NULL) {
Py_DECREF(modulepath);
PyMem_RawFree(envar);
return NULL;
}
PyObject *module = PyImport_ImportModuleLevelObject(
@ -154,6 +165,7 @@ sys_breakpointhook(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyOb
if (hook == NULL) {
goto error;
}
PyMem_RawFree(envar);
PyObject *retval = _PyObject_FastCallKeywords(hook, args, nargs, keywords);
Py_DECREF(hook);
return retval;
@ -164,6 +176,7 @@ sys_breakpointhook(PyObject *self, PyObject *const *args, Py_ssize_t nargs, PyOb
int status = PyErr_WarnFormat(
PyExc_RuntimeWarning, 0,
"Ignoring unimportable $PYTHONBREAKPOINT: \"%s\"", envar);
PyMem_RawFree(envar);
if (status < 0) {
/* Printing the warning raised an exception. */
return NULL;