Bug with dropping privileges when calling helpers: Is it critical?

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Hello,

It would be pretty helpful, if someone could give me some comments about this one:

<http://git.kernel.org/?p=utils/util-linux-ng/util-linux-ng.git;a=commit;h=ebbeb2c7ac1b00b6083905957837a271e80b187e>

I don't request an exploit, but it would be nice to know if this is a critical one, which has to be patched. As there seems to be no new version of util-linux, maybe there is no need to patch immediately, but maybe I'm wrong. Could someone please answer the following with Yes or No:

- Is it really possible to confuse the code, just because of the wrong order of setgid and setuid?

- If someone manages to keep root privileges at this point, then he would be able to call the helper with root privileges and so, for example, overmount /sbin with any NFS server, he wants, right?

Thank you very much in advance

Yours

Manuel
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