SCSI command filtering
SCSI command filtering
Posted Aug 3, 2006 13:38 UTC (Thu) by abatters (✭ supporter ✭, #6932)In reply to: SCSI command filtering by rwmj
Parent article: SCSI command filtering
> Presumably if you can rewrite the firmware, then with a bit of effort you can create some firmware which will use DMA to overwrite arbitrary sections of memory
Not really. SCSI devices are connected through HBAs (i.e. SCSI cards); the HBA has DMA access but the SCSI device itself does not. Rewriting the firmware of the SCSI device wouldn't grant arbirtary access to system memory; you would have to alter the firmware on the HBA or change the HBA driver to do that.
Posted Aug 6, 2006 9:27 UTC (Sun)
by addw (guest, #1771)
[Link]
Would not be easy to do this, but ....
But the modified firmware could return something different on a read than what is on the CD, so when the sysadmin thinks that he is loading some new program he is actually loading something else.SCSI command filtering