[parted-devel] Atari label false positives

[John Paul Adrian Glaubitz]

Hi Phil!

On 05/11/2018 04:18 PM, Phil Susi wrote:
> It seems that the atari label likes to falsely recognize dos labels as
> atari.  Looking at atari_probe, it doesn't seem like this is very hard
> to do.  All that it needs is one word for the size of the disk to be
> less than the physical size of the disk, two bsl words to be zero or
> less than the disk size, the partition start and length words to fit
> within the disk, and 3 bytes to appear to be ascii characters.  Is there
> any way that this can be beefed up at all?

Thanks for digging this up. I wasn't aware of this particular issue before
and I agree, this needs to be addressed. I hope that I didn't cause too
many DOS partitions to be misdetected. Sorry for the inconvenience if I
did. The Atari partition table code has been working great for Debian/m68k so
far though.

> For instance, the name field.. is it really free form ascii or is there
> a specific set of strings that could be limited to?  Also this XGM and
> ICD parts; are they completely optional, so we can't require one of
> those be detected too?

I don't know by heart, but chapter 9 in this Atari filesystem reference
might help us:

> https://people.debian.org/~glaubitz/Atari_HD_File_Sytem_Reference_Guide.pdf

I have also CC'ed the Linux/m68k and Debian/m68k mailing lists in case some of the
guys there knows the answer faster.

Again, sorry for the inconvenience this may have caused. I will look into
how we can improve atari_probe().

Adrian

-- 
  .''`.  John Paul Adrian Glaubitz
: :' :  Debian Developer - glaubitz at debian.org
`. `'   Freie Universitaet Berlin - glaubitz at physik.fu-berlin.de
   `-    GPG: 62FF 8A75 84E0 2956 9546  0006 7426 3B37 F5B5 F913