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:   Fri, 17 Dec 2021 16:24:56 +0100
From:   Lukas Czerner <>
To:     Heiner Kallweit <>
Subject: Re: Problem with data=ordered ext4 mount option in linux-next

On Fri, Dec 17, 2021 at 04:11:32PM +0100, Heiner Kallweit wrote:
> On linux-next systemd-remount-fs complains about an invalid mount option
> here, resulting in a r/o root fs. After playing with the mount options
> it turned out that data=ordered causes the problem. linux-next from Dec
> 1st was ok, so it seems to be related to the new mount API patches.
> At a first glance I saw no obvious problem, the following looks good.
> Maybe you have an idea where to look ..
> static const struct constant_table ext4_param_data[] = {
> 	{"journal",	EXT4_MOUNT_JOURNAL_DATA},
> 	{"ordered",	EXT4_MOUNT_ORDERED_DATA},
> 	{"writeback",	EXT4_MOUNT_WRITEBACK_DATA},
> 	{}
> };
> 	fsparam_enum	("data",		Opt_data, ext4_param_data),

Thank you for the report!

The ext4 mount has been reworked to use the new mount api and the work
has been applied to linux-next couple of days ago so I definitelly
assume there is a bug in there that I've missed. I will be looking into

Can you be a little bit more specific about how to reproduce the problem
as well as the error it generates in the logs ? Any other mount options
used simultaneously, non-default file system features, or mount options
stored within the superblock ?

Can you reproduce it outside of the systemd unit, say a script ?


Powered by blists - more mailing lists