linux-kernel - Re: read-only partitions: does the policy apply to all metadata ?

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 for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue, 10 Mar 2009 13:22:39 -0400
From:	Valdis.Kletnieks@...edu
To:	porte64@...e.fr
Cc:	linux-kernel@...r.kernel.org
Subject: Re: read-only partitions: does the policy apply to all metadata ?

On Tue, 10 Mar 2009 17:26:44 BST, porte64@...e.fr said:
> When a partition is mounted as read-only, does the kernel
> really prevent ANY byte to be written to it, including
> any metadata ?

It's very hard to come up with a workable way to do a true read-only
mount of a journaled filesystem such as ext3 - what do you do if there's
anything in the journal that needs to be replayed?

Your best bet is to not worry about the filesystem, and look at flagging the
underlying block device as read-only.

Content of type "application/pgp-signature" skipped