I’ve acquired a couple more 2 TB Advanced Format drives: a Seagate Barracuda Green (ST2000DL003) and a Samsung SpinPoint F4 EcoGreen (HD204UI, no data sheet available online). Continue reading “More Advanced Format drives: Samsung SpinPoint F4 EcoGreen and Seagate Barracuda Green”
Tag: tech
OpenBSD IPSec backdoor allegations: update
I’m sure I don’t need to remind anyone what this is about…
The latest news: Theo now says that it is probable that NetSec was indeed contracted to insert backdoor code into OpenBSD, but after a month of review and changelog archeology, there is still no sign that they succeeded or even attempted to push tainted code into the tree.
The audit (which is still ongoing) did uncover one serious bug, but there is no reason to believe that it was planted deliberately. This relates to CBC mode, an encryption protocol in which each block of plaintext is combined with the ciphertext of the previous block before encryption to make it harder to attack ciphertext blocks individually. Continue reading “OpenBSD IPSec backdoor allegations: update”
4k drive update
Just to let you know what the current status is wrt. 4k drives:
It looks like the consensus in the industry (meaning everyone except Western Digital) is to announce dual sector sizes, i.e. 512-byte logical sectors on top of 4096-byte physical sectors.
Ivan Voras has taken the initiative to organize a 4k BoF at BSDCan, although judging from the (private) email exchange on the subject, it’s quite possible that a decision will be made before then. Currently, it looks like we’re moving towards having the low-level driver report a 512-byte sector size and 4096-byte stripe width (and, if necessary, an appropriate offset) to GEOM. This preserves backward compatibility, but announces to GEOM consumers that it is a good idea to do I/O in 4096-byte blocks and align data structures on 4096-byte boundaries. All that remains is then to make sure that those GEOM consumers we care about (particularly ZFS) take advantage of this information.
The situation for WD “Advanced Format” drives is a bit more complex, because they announce 512-byte logical sectors. The only solution I can see is to add a quirk system to the ada driver (and possibly to ata as well, if we still care about it) similar to the ones we have for SCSI and USB devices, and match the model number. I believe /WD\d+[A-Z]+RS/ should match all existing Advanced Format drives with no false positives.
OpenBSD IPSec backdoor allegations: triple $100 bounty
In case you hadn’t heard: Gregory Perry alleges that the FBI paid OpenBSD contributors to insert backdoors into OpenBSD’s IPSec stack, with his (Perry’s) knowledge and collaboration.
If that were true, it would also be a concern for FreeBSD, since some of our IPSec code comes from OpenBSD.
I’m having a hard time swallowing this story, though. In fact, I think it’s preposterous. Rather than go into further detail, I’ll refer you to Jason Dixon’s summary, which links to other opinions, and add only one additional objection: if this were true, there would be no “recently expired NDA”; it would be a matter of national security.
I’ll put my money where my mouth is, and post a triple bounty: Continue reading “OpenBSD IPSec backdoor allegations: triple $100 bounty”
chkdsk considered harmful
This list of sysadmin horror stories reminded me of a story of my own:
A long, long time ago, possibly as much as fifteen years ago, I wrote a boot loader of which I’m still quite proud, even though I’ve long since lost the code. I also wrote an installer for it, naturally. The binary was very small (a few kilobytes), even though it included a command-line interface, a partitioning tool, a screen saver and a game, so instead of installing it in a separate partition, I simply installed it in the space between the MBR and the first partition, which on a DOS system in those days was on the order of 30 kB for completely idiotic reasons.
At some point during the development, inevitably, either due to a bug in the installer or incorrect command-line parameters, I managed to install the loader on top of the FAT on one of my DOS partitions. Continue reading “chkdsk considered harmful”