On Thu, 22 Nov 2007 19:17:14 +0100
Jan Kara <[email protected]> wrote:
> Hi,
>
> I guess subject says it all - why is FIBMAP ioctl restricted only to
> root (CAP_SYS_RAWIO)? Corresponding ioctl for XFS is allowed without
> any special capabilities so we are inconsistent here too...
> Would anyone mind if the check is removed?
probably principle of least privilege; the location on physical media
for a file is clearly something internal to the OS, and non-trusted
users normally don't have any business knowing that.
I can't think of any immediate exploitable thing with it, but I'm sure
attackers would find a way to use it to increase their privilege once
they can do something like "write 512 bytes to a disk address of my
choice".. (but then again it's game over mostly already)
>
> Honza
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