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Re: [libvirt] [PATCH 1/3] storage: refresh volume before deletion



On Wed, Mar 09, 2016 at 12:38:58PM -0500, Cole Robinson wrote:
> file volume deletion, via virFileRemove, has some logic that depends
> on uid/gid owner of the path. This info is cached in the volume XML.
> We need to be sure we are using up to date uid/gid before attempting
> to delete the volume, otherwise we can hit a case like this:
> 
> - test.img created with uid=root
> - VM starts up using test.img, owner changed to uid=qemu
> - test.img pool is refreshed, uid=qemu is cached in the volume XML
> - VM shuts down, volume owner changed to gid=root
> - vol-delete test.img thinks uid=qemu, virFileRemove does setuid(qemu),
>   fails to delete test.img since it is actually uid=root
> 

For local filesystems, root should be able to remove anything.
For root-squashed NFS, the uid:gid will usually be nobody:nobody
the whole time, so this refresh is unlikely to learn something new.

I think the real fix is patch 3/3 that stops doing setuid on NFS.

Jan


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