lists.openwall.net   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  linux-cve-announce  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: Mon, 12 Feb 2024 17:47:40 -0500
From: "Theodore Ts'o" <tytso@....edu>
To: Kent Overstreet <kent.overstreet@...ux.dev>
Cc: brauner@...nel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/7] filesystem visibililty ioctls

On Wed, Feb 07, 2024 at 03:26:55PM -0500, Kent Overstreet wrote:
> You've still got the ext4 version, we're not taking that away. But I
> don't think other filesystems will want to deal with the hassle of
> changing UUIDs at runtime, since that's effectively used for API access
> via sysfs and debugfs.

Thanks. I misunderstood the log.  I didn't realize this was just about
not hoisting the ioctl to the VFS level, and dropping the generic uuid
set.

I'm not convinced that we should be using the UUID for kernel API
access, if for no other reason that not all file systems have UUID's.
Sure, modern file systems have UUID's, and individual file systems
might have to have specific features that don't play well with UUID's
changing while the file system is mounted.  But I'm hoping that we
don't add any new interfaces that rely on using the UUID for API
access at the VFS layer.  After all, ext2 (not just ext3 and ext4) has
supported changing the UUID while the file system has been mounted for
*decades*.

     	       	    	       	    	    - Ted

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ