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bpo-35070: test_getgrouplist may fail on macOS if too many groups (GH-13071)

This commit is contained in:
Jeffrey Kintscher 2019-06-13 00:01:29 -07:00 committed by Ned Deily
parent 905e19a9bf
commit 8725c83ed5
2 changed files with 19 additions and 15 deletions
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2
Misc/NEWS.d/next/Library/2019-05-09-18-50-55.bpo-35070.4vaqNL.rst Normal file
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@ -0,0 +1,2 @@
posix.getgrouplist() now works correctly when the user belongs to
NGROUPS_MAX supplemental groups. Patch by Jeffrey Kintscher.

32
Modules/posixmodule.c
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@ -6722,6 +6722,13 @@ os_getpid_impl(PyObject *module)
}
#endif /* HAVE_GETPID */
#ifdef NGROUPS_MAX
#define MAX_GROUPS NGROUPS_MAX
#else
/* defined to be 16 on Solaris7, so this should be a small number */
#define MAX_GROUPS 64
#endif
#ifdef HAVE_GETGROUPLIST
/* AC 3.5: funny apple logic below */
@ -6734,13 +6741,6 @@ Returns a list of groups to which a user belongs.\n\n\
static PyObject *
posix_getgrouplist(PyObject *self, PyObject *args)
{
#ifdef NGROUPS_MAX
#define MAX_GROUPS NGROUPS_MAX
#else
/* defined to be 16 on Solaris7, so this should be a small number */
#define MAX_GROUPS 64
#endif
const char *user;
int i, ngroups;
PyObject *list;
@ -6749,7 +6749,16 @@ posix_getgrouplist(PyObject *self, PyObject *args)
#else
gid_t *groups, basegid;
#endif
ngroups = MAX_GROUPS;
/*
* NGROUPS_MAX is defined by POSIX.1 as the maximum
* number of supplimental groups a users can belong to.
* We have to increment it by one because
* getgrouplist() returns both the supplemental groups
* and the primary group, i.e. all of the groups the
* user belongs to.
*/
ngroups = 1 + MAX_GROUPS;
#ifdef __APPLE__
if (!PyArg_ParseTuple(args, "si:getgrouplist", &user, &basegid))
@ -6818,13 +6827,6 @@ os_getgroups_impl(PyObject *module)
/*[clinic end generated code: output=42b0c17758561b56 input=d3f109412e6a155c]*/
{
PyObject *result = NULL;
#ifdef NGROUPS_MAX
#define MAX_GROUPS NGROUPS_MAX
#else
/* defined to be 16 on Solaris7, so this should be a small number */
#define MAX_GROUPS 64
#endif
gid_t grouplist[MAX_GROUPS];
/* On MacOSX getgroups(2) can return more than MAX_GROUPS results