rsync - Mar 2008 - DO NOT REPLY [Bug 5356] New: SELinux extended attributes incompatibility: Linux kernel 2.6.9 and 2.6.18

https://bugzilla.samba.org/show_bug.cgi?id=5356

           Summary: SELinux extended attributes incompatibility: Linux
                    kernel 2.6.9 and 2.6.18
           Product: rsync
           Version: 3.0.0
          Platform: x64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P3
         Component: core
        AssignedTo: wayned@samba.org
        ReportedBy: nnnnnn+bugzilla-rsync@gmail.com
         QAContact: rsync-qa@samba.org


Description:
======="rsync --xattrs" cannot transfer SELinux extended file
attributes when rsyncing
files between x64 (Intel Xeon) systems running different versions of the Linux
kernel -- e.g. source system running kernel 2.6.9, destination system running
2.6.18


Reproduce by:
========
# rsync --xattrs -zva -e ssh /root/mydir/ remote:/root/mydir
receiving incremental file list
created directory /root/mydir
./
rsync: rsync_xal_set: lsetxattr(".","security.selinux")
failed: Invalid
argument (22)


Comment
=====
It's possible that the "lsetxattr" failure is caused by a
fundamental change in
the file system data structures implementing extended SELinux file attributes
between Linux kernels 2.6.9 and 2.6.18

On the other hand, it might also be possible that the SELinux structures are
actually compatible, and that the above error is just caused by some
unsanitized parameter used in some function call...


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wayned@samba.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX




------- Comment #1 from wayned@samba.org  2008-04-01 21:26 CST -------
Rsync doesn't currently support the weeding out of unwanted xattr names
except
in very limited circumstances:  if it is running as a non-root user (or with
--no-super), then all non user.* names are skipped.  If you're backing up
data,
you can use --fake-super, which stores all non user.* attributes as specially
encoded user.* attributes (using user.rsync.* names).  If you're not backing
up
data, rsync currently only allows you to transfer non-user xattr data between
compatible systems.

No conversion of the xattr values is supported (nor likely ever to be
supported).  I'm not sure how compatible se-linux xattr items are across
systems, but if they are not portible, there is little that rsync can do about
it.  (It can be used to backup the attributes, but not help you make them work
on another system.)

See bug 4573 for the enhancement request to allow xattr names to be filtered.


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matt at mattmccutchen.net changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mstuff at read.org.nz




------- Comment #2 from matt at mattmccutchen.net  2009-11-21 00:50 CST -------
*** Bug 6312 has been marked as a duplicate of this bug. ***


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