[v2] stdlib/tst-secure-getenv: handle >64 groups
Commit Message
This test would fail unnecessarily if the user running it had more than
64 groups since getgroups returns EINVAL if the size provided is less
than the number of supplementary group IDs. Instead dynamically
determine the number of supplementary groups the user has.
---
stdlib/tst-secure-getenv.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)
Comments
* Mike Gerow:
> This test would fail unnecessarily if the user running it had more than
> 64 groups since getgroups returns EINVAL if the size provided is less
> than the number of supplementary group IDs. Instead dynamically
> determine the number of supplementary groups the user has.
Looks good. Do you have commit access? If not, I can add a ChangeLog
entry and push this on your behalf.
Thanks,
Florian
On Tue, Apr 16, 2019 at 02:43:53PM +0200, Florian Weimer wrote:
> Looks good. Do you have commit access? If not, I can add a ChangeLog
> entry and push this on your behalf.
I don't have commit access, so yes I'd really appreciate if you could
push this on my behalf.
Thanks in advance!
* Mike Gerow:
> On Tue, Apr 16, 2019 at 02:43:53PM +0200, Florian Weimer wrote:
>> Looks good. Do you have commit access? If not, I can add a ChangeLog
>> entry and push this on your behalf.
> I don't have commit access, so yes I'd really appreciate if you could
> push this on my behalf.
Fine, pushed.
Florian
@@ -41,8 +41,14 @@ static char MAGIC_ARGUMENT[] = "run-actual-test";
static gid_t
choose_gid (void)
{
- const int count = 64;
- gid_t groups[count];
+ int count = getgroups (0, NULL);
+ if (count < 0)
+ {
+ printf ("getgroups: %m\n");
+ exit (1);
+ }
+ gid_t *groups;
+ groups = xcalloc (count, sizeof (*groups));
int ret = getgroups (count, groups);
if (ret < 0)
{
@@ -50,12 +56,17 @@ choose_gid (void)
exit (1);
}
gid_t current = getgid ();
+ gid_t not_current = 0;
for (int i = 0; i < ret; ++i)
{
if (groups[i] != current)
- return groups[i];
+ {
+ not_current = groups[i];
+ break;
+ }
}
- return 0;
+ free (groups);
+ return not_current;
}