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  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:   Mon, 30 Nov 2020 11:42:28 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     Andreas Dilger <adilger@...ger.ca>
Cc:     Theodore Ts'o <tytso@....edu>, linux-fscrypt@...r.kernel.org,
        Ext4 Developers List <linux-ext4@...r.kernel.org>,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Sebastien Buisson <sbuisson@....com>
Subject: Re: backup/restore of fscrypt files

On Mon, Nov 30, 2020 at 10:39:10AM -0800, Eric Biggers wrote:
> (Allowing only direct I/O on files that don't have encryption key unavailable
> may help...)

It may sense to only provide the ciphertext when reads are done using
RWF_ENCODED
(https://lkml.kernel.org/linux-fsdevel/cover.1605723568.git.osandov@fb.com),
rather than making normal reads return ciphertext when the key is unavailable.

Ciphertext reads would always be uncached, which would avoid two conflicting
uses of the same address_space.

- Eric

Powered by blists - more mailing lists