Re: Capability check on ioctl(FIBMAP) seems wrong

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 4 Oct 1999 20:58:57 +0100 (BST)

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> I could use a suid helper program here, however I don't see the need
> for this capability check. It does not seem to me that there is any
> valid security purpose served by not letting a user of a file determine
> the block number(s) it resides in.

It is there because all the FIBMAP paths dont do enough sanity checking
to be safely used by anyone. The 2.2.x fix is the sledgehammer fix. Only
Lilo used FIBMAP much so nobody got hurt.

For 2.3.x then yes removing the check and fixing it up is an option

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