Re: Bug in xfs

From: David Jacobson (jakesat_private)
Date: Thu Apr 01 1999 - 00:13:17 PST

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    On Wed, 31 Mar 1999, Roman Drahtmueller wrote:
    
    > [snip]
    > > [lukasz@lt /tmp]$ ls -all /etc/shadow
    > > -r--------   1 root     root          544 Mar 30 00:04 /etc/shadow
    > [snip]
    > > [root@lt /root]# xfs &
    > [snip]
    > > [lukasz@lt /tmp]$ ls -all /etc/shadow
    > > -rwxrwxrwt   1 root     root          544 Mar 30 00:04 /etc/shadow
    > [snip]
    > > Solution, As root before run xfs, make rm -rf /tmp/.font-unix
    >
    > For sure this needs to be fixed. Your "solution" introduces a race
    > condition, though, if the font server is started when users are
    > allowed to log on.
    >
    > A better interim aid is not to run xfs as root in the first place. In
    > fact, why would one want to run things as root if not necessary?
    >
    > Roman.
    > Computer Center University of Freiburg, Germany.
    > "The whole world is about three drinks behind."  (Humphrey Bogart)
    >
    
    I would just like to say that Debian/GNU Linux Potato is not vulnerable to
    this xfs vulnerability.
    



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