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This fixes issue7900 by adding code that deals

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with the fact that getgroups(2) might return
more that MAX_GROUPS on OSX.

See the issue (and python-dev archives) for the
gory details. Summarized: OSX behaves rather oddly
and Apple says this is intentional.
This commit is contained in:
Ronald Oussoren 2010-07-23 15:46:03 +00:00
parent 7180d48781
commit 47076f7897
3 changed files with 101 additions and 8 deletions
Download patch file Download diff file Expand all files Collapse all files

49
Modules/posixmodule.c
View file

@ -3995,17 +3995,49 @@ posix_getgroups(PyObject *self, PyObject *noargs)
#define MAX_GROUPS 64
#endif
gid_t grouplist[MAX_GROUPS];
/* On MacOSX getgroups(2) can return more than MAX_GROUPS results
* This is a helper variable to store the intermediate result when
* that happens.
*
* To keep the code readable the OSX behaviour is unconditional,
* according to the POSIX spec this should be safe on all unix-y
* systems.
*/
gid_t* alt_grouplist = grouplist;
int n;
n = getgroups(MAX_GROUPS, grouplist);
if (n < 0)
posix_error();
else {
result = PyList_New(n);
if (result != NULL) {
if (n < 0) {
if (errno == EINVAL) {
n = getgroups(0, NULL);
if (n == -1) {
return posix_error();
}
if (n == 0) {
/* Avoid malloc(0) */
alt_grouplist = grouplist;
} else {
alt_grouplist = PyMem_Malloc(n * sizeof(gid_t));
if (alt_grouplist == NULL) {
errno = EINVAL;
return posix_error();
}
n = getgroups(n, alt_grouplist);
if (n == -1) {
PyMem_Free(alt_grouplist);
return posix_error();
}
}
} else {
return posix_error();
}
}
result = PyList_New(n);
if (result != NULL) {
int i;
for (i = 0; i < n; ++i) {
PyObject *o = PyLong_FromLong((long)grouplist[i]);
PyObject *o = PyLong_FromLong((long)alt_grouplist[i]);
if (o == NULL) {
Py_DECREF(result);
result = NULL;
@ -4013,7 +4045,10 @@ posix_getgroups(PyObject *self, PyObject *noargs)
}
PyList_SET_ITEM(result, i, o);
}
}
}
if (alt_grouplist != grouplist) {
PyMem_Free(alt_grouplist);
}
return result;