linux-ext4 - Re: [PATCH v6 15/17] ext4: add fs-verity read support

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:   Sun, 7 Jul 2019 14:54:18 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Eric Biggers <ebiggers@...nel.org>
Cc:     linux-fscrypt@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-integrity@...r.kernel.org, Jaegeuk Kim <jaegeuk@...nel.org>,
        Victor Hsieh <victorhsieh@...gle.com>,
        Chandan Rajendra <chandan@...ux.vnet.ibm.com>,
        Dave Chinner <david@...morbit.com>,
        Christoph Hellwig <hch@....de>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH v6 15/17] ext4: add fs-verity read support

On Mon, Jul 01, 2019 at 08:32:35AM -0700, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> Make ext4_mpage_readpages() verify data as it is read from fs-verity
> files, using the helper functions from fs/verity/.
> 
> To support both encryption and verity simultaneously, this required
> refactoring the decryption workflow into a generic "post-read
> processing" workflow which can do decryption, verification, or both.
> 
> The case where the ext4 block size is not equal to the PAGE_SIZE is not
> supported yet, since in that case ext4_mpage_readpages() sometimes falls
> back to block_read_full_page(), which does not support fs-verity yet.
> 
> Co-developed-by: Theodore Ts'o <tytso@....edu>
> Signed-off-by: Theodore Ts'o <tytso@....edu>
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Looks good.  Since there's a S-o-B, some might claim that a
Reviewed-by: is not necessary, but to the extent that you modified
this code as well:

Reviewed-by: Theodore Ts'o <tytso@....edu>

							- Ted