Capability check on ioctl(FIBMAP) seems wrong

Derek Fawcus (derek@spider.com)
Mon, 4 Oct 1999 19:26:46 +0100

Hi,
I've got the DVD CSS decryption code working. As part of this one needs
to look up the LBA of a file to get the decryption key. Thus one needs to
use the FIBMAP ioctl. However I've noticed that in 2.2.12 this now has
a capability check (don't know about 2.3.x).

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.

So am I missing something here, or is that capabilty check completly
spurious?

DF

-- 
Derek Fawcus                                                    derek@spider.com
Spider Software Ltd.                                        +44 (0) 131 475 7034


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