lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Thu, 15 Apr 2021 09:49:21 +0200
From:   Christian Brauner <>
To:     Christoph Hellwig <>
Cc:     Theodore Ts'o <>, Eryu Guan <>,
        Christian Brauner <>,,,
        "Darrick J . Wong" <>,
        David Howells <>,
        Amir Goldstein <>
Subject: Re: [PATCH -RFC] ext4: add feature file to advertise that ext4
 supports idmapped mounts

On Thu, Apr 15, 2021 at 07:54:08AM +0200, Christoph Hellwig wrote:
> On Wed, Apr 14, 2021 at 04:47:10PM -0400, Theodore Ts'o wrote:
> > On Mon, Apr 12, 2021 at 06:41:20PM -0400, Theodore Ts'o wrote:
> > > In the ideal world, if the kernel wasn't compiled with the necessary
> > > CONFIG options enabled, it's desirable of the test can detect that
> > > fact and skip running the test instead failing and forcing the person
> > > running the test to try to figure out whether this is a legitmate file
> > > system bug or a just a test setup bug.
> > 
> > So it would make it easier for me to manage running xfstests on ext4
> > if I had added something like this to ext4 and sent it to Linus before
> > v5.12 is released.  What do folks think?
> Completely stupid.  This is a VFS-level feature and we need to have
> proper VFS-level testing (which we have through creating a mount
> with the option), not fs-specific band aids.

Harsh words. :)
Christoph's right though I think for the xfstests we don't need it and
we're covered with what we have in the version I sent out last Sunday.

However, as a general way of advertising to users that ext4 supports
idmapped mounts I don't necessarily see a problem with that. It doesn't
have implications for other filesystems and ext4 already advertises
other features in a similar way.


Powered by blists - more mailing lists