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SubjectRe: [patch] My AMD IDE driver, v2.7
Date
From: "Jeff Garzik" <jgarzik@mandrakesoft.com>

> Your proposal sounds 100% ok to me...
>
> For the details of the userspace interface (for both ATA and SCSI), my
> idea was to use standard read(2) and write(2).
>
> Any number of programs can open /dev/ata/hda/control or
> /dev/scsi/sdc/control. write(2) submits requests, read(2) consumes
> command responses, perhaps buffering a bit so that multiple responses
> are not lost if userspace is slow.
>
> Maybe it's a cheesy way to avoid ioctl(2), maybe not...

Jeff, from a security aspect would it perhaps be better to have the
filter always in place and load rule sets through a rigidly controlled
interface? This gives a control hook for non-Unixoid security model
control over the interface filtering. The filter module would have the
lower level interfaces all opened exclusively so there would be no
paths around the filter. I propose that the rule sets, for each
device's instance of the filter interface, could be changed to include
anything from a null set to forbidding anything past fully controlled
read and write with no raw IO. One specific entity could be allowed
to make the changes and no others. This gives a single interface for
verifying signatures on filter data sets, as well.

{^_^}

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