Messages in this thread | | | Date | Sun, 2 Dec 2007 18:43:33 +0200 | From | Matti Aarnio <> | Subject | Re: Relax permissions for reading hard drive serial number? |
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On Thu, Nov 29, 2007 at 10:07:46PM +0100, Bartlomiej Zolnierkiewicz wrote: > > There are people who, for privacy reasons, really don't like that "unique" > > unchangeable serial numbers can be retrieved by untrusted users. > > > > You should probably chmod the file on the users system, if he is fine with > > that, but not change the kernel default. > > Seconded. > > While on it, how's about exporting model/firmware/serial through > sysfs so /proc/ide/hd*/identify don't have to be used?
Nice, except that while my home workstation running 2.6.23 kernel does have 4 SATA disks in it, plus a compact flash memory card on PATA (boot device, while SATA-disks are JBOD in SW RAID), it has _no_ /sys/bus/ide/, nor /proc/ide/ All devices are under /sys/bus/scsi/
Simplest way for me to pick this data is to use "hdparm -I /dev/sdX" command. Which of course must be run as root. All it does is to open named device, and issue one ioctl().
That ioctl() can be embedded into a suid-root helper program, or it can even (in case of Wine) be run separately to write a text file storing these identifier data on some Wine config file, which the "read from physical device X" then does receive.
In my case I don't want to report any of the hard-drive serial numbers, but rather my boot-device - a flash drive. Hard-drives do break at some point in time, a flash drive in read-only mode does last considerably longer.
> [PATCH] ide: add /sys/bus/ide/devices/*/{model,firmware,serial} sysfs entries ...
/Matti Aarnio
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