[Linux-cluster] GFS breaking POSIX exhibited by Samba?

[Benjamin Marzinski]

On Thu, Sep 22, 2005 at 10:32:37AM +0200, Axel Thimm wrote:
> Hi,
> 
> I've been stuggling with a strange bug in Samba which required me to
> have some of the tdb files with permissions 0666 to allow Samba to
> work.
> 
> The Samba metadata (locking and connection tables etc) are placed on
> GFS to allow for easier relocation of the Samba services ("poor man's
> clustered samba").
> 
> The problem is that Samba opens some files as root, then drops
> priviledges and finally accesses these files assuming that the root
> access rights are still in order. This does not work under GFS, but
> under any other local fs.
> 
> The Samba developers claim that this is POSIX compliant and that GFS
> is not following POSIX in this matter.
> 
> Is this true? Does POSIX require the fds to not change access
> priviledges even when setuiding to another user?

Yes, apparently it does.
 
> If so, why doesn't GFS respect this? A bug or a feature? If the former
> I'll go and bugzilla it. If the latter, can there be a fix for the
> RHEL4 branch?

Since GFS is not complying with POSIX, I'd call this a bug. Please, go
bugzilla it.

-Ben

> Thanks!
> -- 
> Axel.Thimm at ATrpms.net



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