SRU Justification:

Impact: Unionfs cause kernel crash

Fix Description: This fixes a problem with chown'ing a file which has
the suid bit set and has more than one hardlink on a read-only file
system. The stacked nature of the unionfs means that the attribute
changes pass through the lower level attr fs routines with the ATTR_MODE
flag set when it's already been handled before in a stacked operation,
so clear the ATTR_MODE flag. (This is the same fix as in the stacked
ecrypt fs.)

Patch: http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-hardy-
lum.git;a=commit;h=40b5f73849e523d7385d5e6272037eeaddef4ee2

TEST CASE: See https://bugs.edge.launchpad.net/ubuntu/+source/linux-
ubuntu-modules-2.6.24/+bug/224754/comments/4


** Tags added: verification-needed

** Tags removed: ume

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BUG ON crash probably due to unionfs when installing sudo update with dpkg
https://bugs.launchpad.net/bugs/224754
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