lkml.org 
[lkml]   [2019]   [Aug]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: UDF filesystem image with Write-Once UDF Access Type
On Fri 26-07-19 12:44:34, Steve Magnani wrote:
> Hi,
>
> On 7/12/19 5:02 AM, Pali Rohár wrote:
> > In my opinion without support for additional layer, kernel should treat
> > UDF Write-Once Access Type as read-only mount for userspace. And not
> > classic read/write mount.
> >
> > ...
> >
> > It seems that udf.ko does not support updating VAT table, so probably it
> > should treat also filesystem with VAT as read-only too.
> >
>
> I thinkb085fbe2ef7fa7489903c45271ae7b7a52b0f9ab <https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/fs/udf?h=v5.1&id=b085fbe2ef7fa7489903c45271ae7b7a52b0f9ab>, deployed in 4.20,
> does both of the things you want.
>
> One case I ran across today that Windows handles, but Linux doesn't,
> is write-protection via flags in the DomainIdentifier fields of the
> Logical Volume Descriptor and File Set Descriptor. Linux allows
> RW mount when those are marked protected, but Windows forces RO mount.

Yeah, you're right. We are currently completely ignoring the
DomainIdentifier field and at least for read-write mounts we should make
sure it is valid. So that's something that needs fixing.

Honza
--
Jan Kara <jack@suse.com>
SUSE Labs, CR

\
 
 \ /
  Last update: 2019-08-01 09:45    [W:0.067 / U:0.116 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site