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bpo-34170: Rework _PyCoreConfig_Read() to avoid side effect (GH-8353)

Browse source 
Rework _PyCoreConfig_Read() function which *reads* core configuration
to not *modify* the path configuration.

A new _PyCoreConfig_SetPathConfig() function now recreates the path
configuration from the core configuration. This function is now
called very late in _Py_InitializeCore(), just before calling
initimport().

Changes:

* Add _PyCoreConfig.dll_path
* Py_SetPath() now fails with a fatal python error on memory
   allocation failure.
* Rename _PyPathConfig_Calculate() to _PyPathConfig_Calculate_impl()
* Replace _PyPathConfig_Init() with _PyPathConfig_Calculate(): the
  function now requires a _PyPathConfig
* Add _PyPathConfig_SetGlobal() to set the _Py_path_config global
  variable.
* Add _PyCoreConfig_InitPathConfig(): compute the path configuration
* Add _PyCoreConfig_SetPathConfig(): set path configuration from core
  configuration
* Rename wstrlist_append() to _Py_wstrlist_append()
* _Py_wstrlist_append() now handles integer overflow.
This commit is contained in:
Victor Stinner 2018-07-21 02:06:16 +02:00 committed by GitHub
parent 94487d4570
commit b1147e43da
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
8 changed files with 358 additions and 146 deletions
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10
Include/internal/pystate.h
View file

@ -37,7 +37,7 @@ struct _gilstate_runtime_state {
#define _PyGILState_check_enabled _PyRuntime.gilstate.check_enabled
typedef struct {
typedef struct _PyPathConfig {
/* Full path to the Python program */
wchar_t *program_full_path;
wchar_t *prefix;
@ -59,11 +59,15 @@ typedef struct {
PyAPI_DATA(_PyPathConfig) _Py_path_config;
PyAPI_FUNC(_PyInitError) _PyPathConfig_Calculate(
PyAPI_FUNC(_PyInitError) _PyPathConfig_Calculate_impl(
_PyPathConfig *config,
const _PyCoreConfig *core_config);
PyAPI_FUNC(void) _PyPathConfig_Clear(_PyPathConfig *config);
PyAPI_FUNC(void) _PyPathConfig_ClearGlobal(void);
PyAPI_FUNC(_PyInitError) _Py_wstrlist_append(
int *len,
wchar_t ***list,
const wchar_t *str);
/* interpreter state */

9
Include/pylifecycle.h
View file

@ -59,6 +59,9 @@ PyAPI_FUNC(void) _PyCoreConfig_Clear(_PyCoreConfig *);
PyAPI_FUNC(int) _PyCoreConfig_Copy(
_PyCoreConfig *config,
const _PyCoreConfig *config2);
PyAPI_FUNC(_PyInitError) _PyCoreConfig_InitPathConfig(_PyCoreConfig *config);
PyAPI_FUNC(_PyInitError) _PyCoreConfig_SetPathConfig(
const _PyCoreConfig *config);
PyAPI_FUNC(_PyInitError) _PyMainInterpreterConfig_Read(
_PyMainInterpreterConfig *config,
@ -116,7 +119,11 @@ PyAPI_FUNC(wchar_t *) Py_GetPrefix(void);
PyAPI_FUNC(wchar_t *) Py_GetExecPrefix(void);
PyAPI_FUNC(wchar_t *) Py_GetPath(void);
#ifdef Py_BUILD_CORE
PyAPI_FUNC(_PyInitError) _PyPathConfig_Init(const _PyCoreConfig *core_config);
struct _PyPathConfig;
typedef struct _PyPathConfig _PyPathConfig;
PyAPI_FUNC(_PyInitError) _PyPathConfig_SetGlobal(
const _PyPathConfig *config);
PyAPI_FUNC(PyObject*) _PyPathConfig_ComputeArgv0(int argc, wchar_t **argv);
PyAPI_FUNC(int) _Py_FindEnvConfigValue(
FILE *env_file,

3
Include/pystate.h
View file

@ -71,6 +71,9 @@ typedef struct {
wchar_t *base_prefix; /* sys.base_prefix */
wchar_t *exec_prefix; /* sys.exec_prefix */
wchar_t *base_exec_prefix; /* sys.base_exec_prefix */
#ifdef MS_WINDOWS
wchar_t *dll_path; /* Windows DLL path */
#endif
/* Private fields */
int _disable_importlib; /* Needed by freeze_importlib */

2
Modules/getpath.c
View file

@ -946,7 +946,7 @@ calculate_path_impl(const _PyCoreConfig *core_config,
_PyInitError
_PyPathConfig_Calculate(_PyPathConfig *config, const _PyCoreConfig *core_config)
_PyPathConfig_Calculate_impl(_PyPathConfig *config, const _PyCoreConfig *core_config)
{
PyCalculatePath calculate;
memset(&calculate, 0, sizeof(calculate));

139
Modules/main.c
View file

@ -650,7 +650,7 @@ pymain_free_raw(_PyMain *pymain)
configuration options set before Py_Initialize() which should
remain valid after Py_Finalize(), since
Py_Initialize()-Py_Finalize() can be called multiple times. */
_PyPathConfig_Clear(&_Py_path_config);
_PyPathConfig_ClearGlobal();
pymain_clear_config(pymain);
@ -701,9 +701,13 @@ pymain_run_main_from_importer(_PyMain *pymain)
}
static _PyInitError
wstrlist_append(int *len, wchar_t ***list, const wchar_t *str)
_PyInitError
_Py_wstrlist_append(int *len, wchar_t ***list, const wchar_t *str)
{
if (*len == INT_MAX) {
/* len+1 would overflow */
return _Py_INIT_NO_MEMORY();
}
wchar_t *str2 = _PyMem_RawWcsdup(str);
if (str2 == NULL) {
return _Py_INIT_NO_MEMORY();
@ -725,7 +729,7 @@ wstrlist_append(int *len, wchar_t ***list, const wchar_t *str)
static int
pymain_wstrlist_append(_PyMain *pymain, int *len, wchar_t ***list, const wchar_t *str)
{
_PyInitError err = wstrlist_append(len, list, str);
_PyInitError err = _Py_wstrlist_append(len, list, str);
if (_Py_INIT_FAILED(err)) {
pymain->err = err;
return -1;
@ -972,9 +976,9 @@ static _PyInitError
config_add_warnings_optlist(_PyCoreConfig *config, int len, wchar_t **options)
{
for (int i = 0; i < len; i++) {
_PyInitError err = wstrlist_append(&config->nwarnoption,
&config->warnoptions,
options[i]);
_PyInitError err = _Py_wstrlist_append(&config->nwarnoption,
&config->warnoptions,
options[i]);
if (_Py_INIT_FAILED(err)) {
return err;
}
@ -1006,9 +1010,9 @@ config_init_warnoptions(_PyCoreConfig *config, _Py_CommandLineDetails *cmdline)
*/
if (config->dev_mode) {
err = wstrlist_append(&config->nwarnoption,
&config->warnoptions,
L"default");
err = _Py_wstrlist_append(&config->nwarnoption,
&config->warnoptions,
L"default");
if (_Py_INIT_FAILED(err)) {
return err;
}
@ -1040,9 +1044,9 @@ config_init_warnoptions(_PyCoreConfig *config, _Py_CommandLineDetails *cmdline)
else {
filter = L"default::BytesWarning";
}
err = wstrlist_append(&config->nwarnoption,
&config->warnoptions,
filter);
err = _Py_wstrlist_append(&config->nwarnoption,
&config->warnoptions,
filter);
if (_Py_INIT_FAILED(err)) {
return err;
}
@ -1077,9 +1081,9 @@ cmdline_init_env_warnoptions(_Py_CommandLineDetails *cmdline)
warning != NULL;
warning = WCSTOK(NULL, L",", &context))
{
_PyInitError err = wstrlist_append(&cmdline->nenv_warnoption,
&cmdline->env_warnoptions,
warning);
_PyInitError err = _Py_wstrlist_append(&cmdline->nenv_warnoption,
&cmdline->env_warnoptions,
warning);
if (_Py_INIT_FAILED(err)) {
PyMem_RawFree(env);
return err;
@ -2099,101 +2103,6 @@ config_init_locale(_PyCoreConfig *config)
}
static _PyInitError
config_init_module_search_paths(_PyCoreConfig *config)
{
assert(config->module_search_paths == NULL);
assert(config->nmodule_search_path < 0);
config->nmodule_search_path = 0;
const wchar_t *sys_path = Py_GetPath();
const wchar_t delim = DELIM;
const wchar_t *p = sys_path;
while (1) {
p = wcschr(sys_path, delim);
if (p == NULL) {
p = sys_path + wcslen(sys_path); /* End of string */
}
size_t path_len = (p - sys_path);
wchar_t *path = PyMem_RawMalloc((path_len + 1) * sizeof(wchar_t));
if (path == NULL) {
return _Py_INIT_NO_MEMORY();
}
memcpy(path, sys_path, path_len * sizeof(wchar_t));
path[path_len] = L'\0';
_PyInitError err = wstrlist_append(&config->nmodule_search_path,
&config->module_search_paths,
path);
PyMem_RawFree(path);
if (_Py_INIT_FAILED(err)) {
return err;
}
if (*p == '\0') {
break;
}
sys_path = p + 1;
}
return _Py_INIT_OK();
}
static _PyInitError
config_init_path_config(_PyCoreConfig *config)
{
_PyInitError err = _PyPathConfig_Init(config);
if (_Py_INIT_FAILED(err)) {
return err;
}
if (config->nmodule_search_path < 0) {
err = config_init_module_search_paths(config);
if (_Py_INIT_FAILED(err)) {
return err;
}
}
if (config->executable == NULL) {
config->executable = _PyMem_RawWcsdup(Py_GetProgramFullPath());
if (config->executable == NULL) {
return _Py_INIT_NO_MEMORY();
}
}
if (config->prefix == NULL) {
config->prefix = _PyMem_RawWcsdup(Py_GetPrefix());
if (config->prefix == NULL) {
return _Py_INIT_NO_MEMORY();
}
}
if (config->exec_prefix == NULL) {
config->exec_prefix = _PyMem_RawWcsdup(Py_GetExecPrefix());
if (config->exec_prefix == NULL) {
return _Py_INIT_NO_MEMORY();
}
}
if (config->base_prefix == NULL) {
config->base_prefix = _PyMem_RawWcsdup(config->prefix);
if (config->base_prefix == NULL) {
return _Py_INIT_NO_MEMORY();
}
}
if (config->base_exec_prefix == NULL) {
config->base_exec_prefix = _PyMem_RawWcsdup(config->exec_prefix);
if (config->base_exec_prefix == NULL) {
return _Py_INIT_NO_MEMORY();
}
}
return _Py_INIT_OK();
}
/* Read configuration settings from standard locations
*
* This function doesn't make any changes to the interpreter state - it
@ -2252,7 +2161,7 @@ _PyCoreConfig_Read(_PyCoreConfig *config)
}
if (!config->_disable_importlib) {
err = config_init_path_config(config);
err = _PyCoreConfig_InitPathConfig(config);
if (_Py_INIT_FAILED(err)) {
return err;
}
@ -2294,6 +2203,9 @@ _PyCoreConfig_Clear(_PyCoreConfig *config)
CLEAR(config->prefix);
CLEAR(config->base_prefix);
CLEAR(config->exec_prefix);
#ifdef MS_WINDOWS
CLEAR(config->dll_path);
#endif
CLEAR(config->base_exec_prefix);
#undef CLEAR
#undef CLEAR_WSTRLIST
@ -2356,6 +2268,9 @@ _PyCoreConfig_Copy(_PyCoreConfig *config, const _PyCoreConfig *config2)
COPY_STR_ATTR(prefix);
COPY_STR_ATTR(base_prefix);
COPY_STR_ATTR(exec_prefix);
#ifdef MS_WINDOWS
COPY_STR_ATTR(dll_path);
#endif
COPY_STR_ATTR(base_exec_prefix);
#undef COPY_ATTR

2
PC/getpathp.c
View file

@ -1000,7 +1000,7 @@ calculate_free(PyCalculatePath *calculate)
_PyInitError
_PyPathConfig_Calculate(_PyPathConfig *config, const _PyCoreConfig *core_config)
_PyPathConfig_Calculate_impl(_PyPathConfig *config, const _PyCoreConfig *core_config)
{
PyCalculatePath calculate;
memset(&calculate, 0, sizeof(calculate));

332
Python/pathconfig.c
View file

@ -13,7 +13,23 @@ extern "C" {
_PyPathConfig _Py_path_config = _PyPathConfig_INIT;
void
static int
copy_wstr(wchar_t **dst, const wchar_t *src)
{
if (src != NULL) {
*dst = _PyMem_RawWcsdup(src);
if (*dst == NULL) {
return -1;
}
}
else {
*dst = NULL;
}
return 0;
}
static void
_PyPathConfig_Clear(_PyPathConfig *config)
{
/* _PyMem_SetDefaultAllocator() is needed to get a known memory allocator,
@ -44,16 +60,11 @@ _PyPathConfig_Clear(_PyPathConfig *config)
}
/* Initialize paths for Py_GetPath(), Py_GetPrefix(), Py_GetExecPrefix()
and Py_GetProgramFullPath() */
_PyInitError
_PyPathConfig_Init(const _PyCoreConfig *core_config)
/* Calculate the path configuration: initialize path_config from core_config */
static _PyInitError
_PyPathConfig_Calculate(_PyPathConfig *path_config,
const _PyCoreConfig *core_config)
{
if (_Py_path_config.module_search_path) {
/* Already initialized */
return _Py_INIT_OK();
}
_PyInitError err;
_PyPathConfig new_config = _PyPathConfig_INIT;
@ -62,31 +73,67 @@ _PyPathConfig_Init(const _PyCoreConfig *core_config)
/* Calculate program_full_path, prefix, exec_prefix (Unix)
or dll_path (Windows), and module_search_path */
err = _PyPathConfig_Calculate(&new_config, core_config);
err = _PyPathConfig_Calculate_impl(&new_config, core_config);
if (_Py_INIT_FAILED(err)) {
_PyPathConfig_Clear(&new_config);
goto done;
goto err;
}
/* Copy home and program_name from core_config */
if (core_config->home != NULL) {
new_config.home = _PyMem_RawWcsdup(core_config->home);
if (new_config.home == NULL) {
err = _Py_INIT_NO_MEMORY();
goto done;
}
if (copy_wstr(&new_config.home, core_config->home) < 0) {
err = _Py_INIT_NO_MEMORY();
goto err;
}
else {
new_config.home = NULL;
if (copy_wstr(&new_config.program_name, core_config->program_name) < 0) {
err = _Py_INIT_NO_MEMORY();
goto err;
}
new_config.program_name = _PyMem_RawWcsdup(core_config->program_name);
if (new_config.program_name == NULL) {
err = _Py_INIT_NO_MEMORY();
goto done;
}
_PyPathConfig_Clear(path_config);
*path_config = new_config;
err = _Py_INIT_OK();
goto done;
err:
_PyPathConfig_Clear(&new_config);
done:
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
return err;
}
_PyInitError
_PyPathConfig_SetGlobal(const _PyPathConfig *config)
{
_PyInitError err;
_PyPathConfig new_config = _PyPathConfig_INIT;
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
#define COPY_ATTR(ATTR) \
do { \
if (copy_wstr(&new_config.ATTR, config->ATTR) < 0) { \
_PyPathConfig_Clear(&new_config); \
err = _Py_INIT_NO_MEMORY(); \
goto done; \
} \
} while (0)
COPY_ATTR(program_full_path);
COPY_ATTR(prefix);
#ifdef MS_WINDOWS
COPY_ATTR(dll_path);
#else
COPY_ATTR(exec_prefix);
#endif
COPY_ATTR(module_search_path);
COPY_ATTR(program_name);
COPY_ATTR(home);
_PyPathConfig_Clear(&_Py_path_config);
/* Steal new_config strings; don't clear new_config */
_Py_path_config = new_config;
err = _Py_INIT_OK();
@ -97,15 +144,228 @@ _PyPathConfig_Init(const _PyCoreConfig *core_config)
}
void
_PyPathConfig_ClearGlobal(void)
{
_PyPathConfig_Clear(&_Py_path_config);
}
static wchar_t*
wstrlist_join(wchar_t sep, int count, wchar_t **list)
{
size_t len = 1; /* NUL terminator */
for (int i=0; i < count; i++) {
if (i != 0) {
len++;
}
len += wcslen(list[i]);
}
wchar_t *text = PyMem_RawMalloc(len * sizeof(wchar_t));
if (text == NULL) {
return NULL;
}
wchar_t *str = text;
for (int i=0; i < count; i++) {
wchar_t *path = list[i];
if (i != 0) {
*str++ = SEP;
}
len = wcslen(path);
memcpy(str, path, len * sizeof(wchar_t));
str += len;
}
*str = L'\0';
return text;
}
/* Set the global path configuration from core_config. */
_PyInitError
_PyCoreConfig_SetPathConfig(const _PyCoreConfig *core_config)
{
PyMemAllocatorEx old_alloc;
_PyMem_SetDefaultAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
_PyInitError err;
_PyPathConfig path_config = _PyPathConfig_INIT;
path_config.module_search_path = wstrlist_join(DELIM,
core_config->nmodule_search_path,
core_config->module_search_paths);
if (path_config.module_search_path == NULL) {
goto no_memory;
}
if (copy_wstr(&path_config.program_full_path, core_config->executable) < 0) {
goto no_memory;
}
if (copy_wstr(&path_config.prefix, core_config->prefix) < 0) {
goto no_memory;
}
#ifdef MS_WINDOWS
if (copy_wstr(&path_config.dll_path, core_config->dll_path) < 0) {
goto no_memory;
}
#else
if (copy_wstr(&path_config.exec_prefix, core_config->exec_prefix) < 0) {
goto no_memory;
}
#endif
if (copy_wstr(&path_config.program_name, core_config->program_name) < 0) {
goto no_memory;
}
if (copy_wstr(&path_config.home, core_config->home) < 0) {
goto no_memory;
}
err = _PyPathConfig_SetGlobal(&path_config);
if (_Py_INIT_FAILED(err)) {
goto done;
}
err = _Py_INIT_OK();
goto done;
no_memory:
err = _Py_INIT_NO_MEMORY();
done:
_PyPathConfig_Clear(&path_config);
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
return err;
}
static _PyInitError
core_config_init_module_search_paths(_PyCoreConfig *config,
_PyPathConfig *path_config)
{
assert(config->module_search_paths == NULL);
assert(config->nmodule_search_path < 0);
config->nmodule_search_path = 0;
const wchar_t *sys_path = path_config->module_search_path;
const wchar_t delim = DELIM;
const wchar_t *p = sys_path;
while (1) {
p = wcschr(sys_path, delim);
if (p == NULL) {
p = sys_path + wcslen(sys_path); /* End of string */
}
size_t path_len = (p - sys_path);
wchar_t *path = PyMem_RawMalloc((path_len + 1) * sizeof(wchar_t));
if (path == NULL) {
return _Py_INIT_NO_MEMORY();
}
memcpy(path, sys_path, path_len * sizeof(wchar_t));
path[path_len] = L'\0';
_PyInitError err = _Py_wstrlist_append(&config->nmodule_search_path,
&config->module_search_paths,
path);
PyMem_RawFree(path);
if (_Py_INIT_FAILED(err)) {
return err;
}
if (*p == '\0') {
break;
}
sys_path = p + 1;
}
return _Py_INIT_OK();
}
_PyInitError
_PyCoreConfig_InitPathConfig(_PyCoreConfig *config)
{
_PyPathConfig path_config = _PyPathConfig_INIT;
_PyInitError err;
err = _PyPathConfig_Calculate(&path_config, config);
if (_Py_INIT_FAILED(err)) {
goto error;
}
if (config->nmodule_search_path < 0) {
err = core_config_init_module_search_paths(config, &path_config);
if (_Py_INIT_FAILED(err)) {
goto error;
}
}
if (config->executable == NULL) {
if (copy_wstr(&config->executable,
path_config.program_full_path) < 0) {
goto no_memory;
}
}
if (config->prefix == NULL) {
if (copy_wstr(&config->prefix, path_config.prefix) < 0) {
goto no_memory;
}
}
if (config->exec_prefix == NULL) {
#ifdef MS_WINDOWS
wchar_t *exec_prefix = path_config.prefix;
#else
wchar_t *exec_prefix = path_config.exec_prefix;
#endif
if (copy_wstr(&config->exec_prefix, exec_prefix) < 0) {
goto no_memory;
}
}
#ifdef MS_WINDOWS
if (config->dll_path == NULL) {
if (copy_wstr(&config->dll_path, path_config.dll_path) < 0) {
goto no_memory;
}
}
#endif
if (config->base_prefix == NULL) {
if (copy_wstr(&config->base_prefix, config->prefix) < 0) {
goto no_memory;
}
}
if (config->base_exec_prefix == NULL) {
if (copy_wstr(&config->base_exec_prefix, config->exec_prefix) < 0) {
goto no_memory;
}
}
_PyPathConfig_Clear(&path_config);
return _Py_INIT_OK();
no_memory:
err = _Py_INIT_NO_MEMORY();
error:
_PyPathConfig_Clear(&path_config);
return err;
}
static void
pathconfig_global_init(void)
{
if (_Py_path_config.module_search_path) {
if (_Py_path_config.module_search_path != NULL) {
/* Already initialized */
return;
}
_PyInitError err;
_PyPathConfig path_config = _PyPathConfig_INIT;
_PyCoreConfig config = _PyCoreConfig_INIT;
err = _PyCoreConfig_Read(&config);
@ -113,15 +373,22 @@ pathconfig_global_init(void)
goto error;
}
err = _PyPathConfig_Init(&config);
err = _PyPathConfig_Calculate(&path_config, &config);
if (_Py_INIT_FAILED(err)) {
goto error;
}
err = _PyPathConfig_SetGlobal(&path_config);
if (_Py_INIT_FAILED(err)) {
goto error;
}
_PyPathConfig_Clear(&path_config);
_PyCoreConfig_Clear(&config);
return;
error:
_PyPathConfig_Clear(&path_config);
_PyCoreConfig_Clear(&config);
_Py_FatalInitError(err);
}
@ -142,13 +409,18 @@ Py_SetPath(const wchar_t *path)
_PyPathConfig new_config;
new_config.program_full_path = _PyMem_RawWcsdup(Py_GetProgramName());
int alloc_error = (new_config.program_full_path == NULL);
new_config.prefix = _PyMem_RawWcsdup(L"");
alloc_error |= (new_config.prefix == NULL);
#ifdef MS_WINDOWS
new_config.dll_path = _PyMem_RawWcsdup(L"");
alloc_error |= (new_config.dll_path == NULL);
#else
new_config.exec_prefix = _PyMem_RawWcsdup(L"");
alloc_error |= (new_config.exec_prefix == NULL);
#endif
new_config.module_search_path = _PyMem_RawWcsdup(path);
alloc_error |= (new_config.module_search_path == NULL);
/* steal the home and program_name values (to leave them unchanged) */
new_config.home = _Py_path_config.home;
@ -160,6 +432,10 @@ Py_SetPath(const wchar_t *path)
_Py_path_config = new_config;
PyMem_SetAllocator(PYMEM_DOMAIN_RAW, &old_alloc);
if (alloc_error) {
Py_FatalError("Py_SetPath() failed: out of memory");
}
}

7
Python/pylifecycle.c
View file

@ -759,6 +759,13 @@ _Py_InitializeCore(const _PyCoreConfig *core_config)
if (!_PyContext_Init())
return _Py_INIT_ERR("can't init context");
if (!core_config->_disable_importlib) {
err = _PyCoreConfig_SetPathConfig(core_config);
if (_Py_INIT_FAILED(err)) {
return err;
}
}
/* This call sets up builtin and frozen import support */
if (!interp->core_config._disable_importlib) {
err = initimport(interp, sysmod);