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python3/backport-20104-Fix-leaks-and-errors-in-new-os.posix_spawn.patch
hanxinke 046f4dd6a3 python3: expose posix_spawn in os module
2021-05-25 05:10:34 -04:00

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From 94083ce4d60abd390fbba615de333bdec07edc2c Mon Sep 17 00:00:00 2001
From: Pablo Galindo <Pablogsal@gmail.com>
Date: Mon, 29 Jan 2018 20:34:42 +0000
Subject: [PATCH] bpo-20104: Fix leaks and errors in new os.posix_spawn
(GH-5418)
* Fix memory leaks and error handling in posix spawn
* Improve error handling when destroying the file_actions object
* Py_DECREF the result of PySequence_Fast on error
* Handle uninitialized pid
* Use OSError if file actions fails to initialize
* Move _file_actions to outer scope to avoid undefined behaviour
* Remove HAVE_POSIX_SPAWN define in Modules/posixmodule.c
* Unshadow exception and clean error message
Conflict:NA
Reference:https://github.com/python/cpython/commit/0cd6bca65519109a8a7862d38ba1b8924e432a16
Signed-off-by: hanxinke <hanxinke@huawei.com>
---
Modules/posixmodule.c | 111 +++++++++++++++++++++++++-----------------
1 file changed, 66 insertions(+), 45 deletions(-)
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index fcb22c2..b5636f5 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -176,7 +176,6 @@ corresponding Unix manual entries for more information on calls.");
#else
/* Unix functions that the configure script doesn't check for */
#define HAVE_EXECV 1
-#define HAVE_POSIX_SPAWN 1
#define HAVE_FORK 1
#if defined(__USLC__) && defined(__SCO_VERSION__) /* SCO UDK Compiler */
#define HAVE_FORK1 1
@@ -5161,17 +5160,22 @@ os_posix_spawn_impl(PyObject *module, path_t *path, PyObject *argv,
/*[clinic end generated code: output=d023521f541c709c input=0ec9f1cfdc890be5]*/
{
EXECV_CHAR **argvlist = NULL;
- EXECV_CHAR **envlist;
+ EXECV_CHAR **envlist = NULL;
+ posix_spawn_file_actions_t _file_actions;
+ posix_spawn_file_actions_t *file_actionsp = NULL;
Py_ssize_t argc, envc;
+ PyObject* result = NULL;
+ PyObject* seq = NULL;
+
/* posix_spawn has three arguments: (path, argv, env), where
argv is a list or tuple of strings and env is a dictionary
like posix.environ. */
- if (!PySequence_Check(argv)){
+ if (!PySequence_Check(argv)) {
PyErr_SetString(PyExc_TypeError,
"posix_spawn: argv must be a tuple or list");
- goto fail;
+ goto exit;
}
argc = PySequence_Size(argv);
if (argc < 1) {
@@ -5182,40 +5186,37 @@ os_posix_spawn_impl(PyObject *module, path_t *path, PyObject *argv,
if (!PyMapping_Check(env)) {
PyErr_SetString(PyExc_TypeError,
"posix_spawn: environment must be a mapping object");
- goto fail;
+ goto exit;
}
argvlist = parse_arglist(argv, &argc);
if (argvlist == NULL) {
- goto fail;
+ goto exit;
}
if (!argvlist[0][0]) {
PyErr_SetString(PyExc_ValueError,
"posix_spawn: argv first element cannot be empty");
- goto fail;
+ goto exit;
}
envlist = parse_envlist(env, &envc);
- if (envlist == NULL)
- goto fail;
+ if (envlist == NULL) {
+ goto exit;
+ }
pid_t pid;
- posix_spawn_file_actions_t *file_actionsp = NULL;
- if (file_actions != NULL && file_actions != Py_None){
- posix_spawn_file_actions_t _file_actions;
+ if (file_actions != NULL && file_actions != Py_None) {
if(posix_spawn_file_actions_init(&_file_actions) != 0){
- PyErr_SetString(PyExc_TypeError,
+ PyErr_SetString(PyExc_OSError,
"Error initializing file actions");
- goto fail;
+ goto exit;
}
-
file_actionsp = &_file_actions;
-
- PyObject* seq = PySequence_Fast(file_actions, "file_actions must be a sequence");
- if(seq == NULL){
- goto fail;
+ seq = PySequence_Fast(file_actions, "file_actions must be a sequence");
+ if(seq == NULL) {
+ goto exit;
}
PyObject* file_actions_obj;
PyObject* mode_obj;
@@ -5223,9 +5224,9 @@ os_posix_spawn_impl(PyObject *module, path_t *path, PyObject *argv,
for (int i = 0; i < PySequence_Fast_GET_SIZE(seq); ++i) {
file_actions_obj = PySequence_Fast_GET_ITEM(seq, i);
- if(!PySequence_Check(file_actions_obj) | !PySequence_Size(file_actions_obj)){
+ if(!PySequence_Check(file_actions_obj) | !PySequence_Size(file_actions_obj)) {
PyErr_SetString(PyExc_TypeError,"Each file_action element must be a non empty sequence");
- goto fail;
+ goto exit;
}
@@ -5237,83 +5238,103 @@ os_posix_spawn_impl(PyObject *module, path_t *path, PyObject *argv,
switch(mode) {
case POSIX_SPAWN_OPEN:
- if(PySequence_Size(file_actions_obj) != 5){
+ if(PySequence_Size(file_actions_obj) != 5) {
PyErr_SetString(PyExc_TypeError,"A open file_action object must have 5 elements");
- goto fail;
+ goto exit;
}
long open_fd = PyLong_AsLong(PySequence_GetItem(file_actions_obj, 1));
if(PyErr_Occurred()) {
- goto fail;
+ goto exit;
}
const char* open_path = PyUnicode_AsUTF8(PySequence_GetItem(file_actions_obj, 2));
- if(open_path == NULL){
- goto fail;
+ if(open_path == NULL) {
+ goto exit;
}
long open_oflag = PyLong_AsLong(PySequence_GetItem(file_actions_obj, 3));
if(PyErr_Occurred()) {
- goto fail;
+ goto exit;
}
long open_mode = PyLong_AsLong(PySequence_GetItem(file_actions_obj, 4));
if(PyErr_Occurred()) {
- goto fail;
+ goto exit;
+ }
+ if(posix_spawn_file_actions_addopen(file_actionsp, open_fd, open_path, open_oflag, open_mode)) {
+ PyErr_SetString(PyExc_OSError,"Failed to add open file action");
+ goto exit;
}
- posix_spawn_file_actions_addopen(file_actionsp, open_fd, open_path, open_oflag, open_mode);
+
break;
case POSIX_SPAWN_CLOSE:
if(PySequence_Size(file_actions_obj) != 2){
PyErr_SetString(PyExc_TypeError,"A close file_action object must have 2 elements");
- goto fail;
+ goto exit;
}
long close_fd = PyLong_AsLong(PySequence_GetItem(file_actions_obj, 1));
if(PyErr_Occurred()) {
- goto fail;
+ goto exit;
+ }
+ if(posix_spawn_file_actions_addclose(file_actionsp, close_fd)) {
+ PyErr_SetString(PyExc_OSError,"Failed to add close file action");
+ goto exit;
}
- posix_spawn_file_actions_addclose(file_actionsp, close_fd);
break;
case POSIX_SPAWN_DUP2:
if(PySequence_Size(file_actions_obj) != 3){
PyErr_SetString(PyExc_TypeError,"A dup2 file_action object must have 3 elements");
- goto fail;
+ goto exit;
}
long fd1 = PyLong_AsLong(PySequence_GetItem(file_actions_obj, 1));
if(PyErr_Occurred()) {
- goto fail;
+ goto exit;
}
long fd2 = PyLong_AsLong(PySequence_GetItem(file_actions_obj, 2));
if(PyErr_Occurred()) {
- goto fail;
+ goto exit;
+ }
+ if(posix_spawn_file_actions_adddup2(file_actionsp, fd1, fd2)) {
+ PyErr_SetString(PyExc_OSError,"Failed to add dup2 file action");
+ goto exit;
}
- posix_spawn_file_actions_adddup2(file_actionsp, fd1, fd2);
break;
default:
PyErr_SetString(PyExc_TypeError,"Unknown file_actions identifier");
- goto fail;
+ goto exit;
}
}
- Py_DECREF(seq);
-}
+ }
_Py_BEGIN_SUPPRESS_IPH
- posix_spawn(&pid, path->narrow, file_actionsp, NULL, argvlist, envlist);
- return PyLong_FromPid(pid);
+ int err_code = posix_spawn(&pid, path->narrow, file_actionsp, NULL, argvlist, envlist);
_Py_END_SUPPRESS_IPH
+ if(err_code) {
+ PyErr_SetString(PyExc_OSError,"posix_spawn call failed");
+ goto exit;
+ }
+ result = PyLong_FromPid(pid);
- path_error(path);
+exit:
- free_string_array(envlist, envc);
+ Py_XDECREF(seq);
-fail:
+ if(file_actionsp) {
+ posix_spawn_file_actions_destroy(file_actionsp);
+ }
+
+ if (envlist) {
+ free_string_array(envlist, envc);
+ }
if (argvlist) {
free_string_array(argvlist, argc);
}
- return NULL;
+
+ return result;
}
--
2.23.0
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