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Re: Wrong UIDs reported in /proc/net/tcp

To: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Subject: Re: Wrong UIDs reported in /proc/net/tcp
From: Stephen Hemminger <shemminger@xxxxxxxx>
Date: Thu, 18 Nov 2004 13:27:00 -0800
Cc: "Chad N. Tindel" <chad@xxxxxxxxxx>, netdev@xxxxxxxxxxx, linux-net@xxxxxxxxxxxxxxx
In-reply-to: <20041118210307.GA9557@xxxxxxxxxxxxxxxxxxx>
Organization: Open Source Development Lab
References: <20041109205358.GA64015@xxxxxxxxxxxxxx> <E1CRdBr-0001P2-00@xxxxxxxxxxxxxxxxxxxxxxxx> <20041118190257.GA7084@xxxxxxxxxxxxxx> <20041118210307.GA9557@xxxxxxxxxxxxxxxxxxx>
Sender: netdev-bounce@xxxxxxxxxxx
On Fri, 19 Nov 2004 08:03:07 +1100
Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> wrote:

> On Thu, Nov 18, 2004 at 02:02:57PM -0500, Chad N. Tindel wrote:
> > 
> > OK, so just out of sheer morbid curiousity, I added an ioctl which will
> > accept 4 parameters (the address/port pairs), and will return the user id
> > associated with that socket.  I also changed pidentd to call this ioctl
> > instead of looking at /proc/net/tcp.  This should theoretically get rid
> > of all race conditions.
> 
> Please show us the code of your ioctl.
> 
> Have you tried netlink yet? Does it exhibit the same problem?

It could also be the sockets are shared between processes with uid's or that
the real/effective uid or different or even the uid is that of the original
creator and the file was inherited across exec.

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