Max groups at 32?

Austin Gonyou
2002-06-04T03:31:50Z

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I'm not sure if this is a Linux capabilities problem, a PAM problem, or
what, but I've noticed that If I add a user to > 32 groups...that user
cannot access anything in a directory owned by a group > the 32nd group.

Has anyone else experienced this?

Here is a sample script to help troubleshoot if you're interested:

#!/bin/bash
x=34;
useradd testuser
while [ ! $x -lt 1 ]
do groupadd group$x
gpasswd -a testuser group$x
x=$(( $x - 1 ))
done

groups
read
printf "press any key..."
groups testuser
printf "press any key..."
read
mkdir /testdir
chown root:group1 /testdir
chmod 770 /testdir
su - testuser -c "ls /testdir"
printf "press any key..."
read
userdel -r testuser

If all has gone properly, and group1 is *not* in the first groups
listing, (not "groups testuser"), then the user will not be able to even
ls /testdir, and you'll get permission denied.

Please advise, if you can.
TIA.

--
Austin Gonyou
Systems Architect, CCNA
Coremetrics, Inc.
Phone: 512-698-7250
email: austin@coremetrics.com

"One ought never to turn one's back on a threatened danger and
try to run away from it. If you do that, you will double the danger.
But if you meet it promptly and without flinching, you will
reduce the danger by half."
Sir Winston Churchill

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