Message-ID: <43D55DC3.9080900@lawatsch.at>
Date: Mon, 23 Jan 2006 23:50:43 +0100
From: Philip Lawatsch <philip@lawatsch.at>
Organization: WaUG HQ Graz
User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.8) Gecko/20060114 Thunderbird/1.5 Mnenhy/0.7.3.0
MIME-Version: 1.0
To: linux-kernel@vger.kernel.org
Subject: NFSv3 / VFS and group problems
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 889
Lines: 30

Hi,

I've had the joy to debug a production system with a really crappy setup.

They have a user "fred" which belongs to ~5000 groups (say 
group1-group5000).


So far so bad. Even worse, they have a nfs backend  with lots of files 
which are owned by users belonging to these groups.

Ok, now my problem is that "fred" can open a file which is

-rw-rw----  someone group300 foo

but a read on this file will fail with EIO

Since group300 is way beyond the 16 groups nfs supports shouldn't fred 
actually get a EACCES back from the open call?

Problem happens with 2.6.13 (vanilla, not tainted) on both server and 
client.


kind regards Philip
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/