linux-ext4 - [PATCH 0/3] ext4: Fix data corruption when extending DIO write races with buffered read

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-next>] [day] [month] [year] [list]

Message-Id: <20210412102333.2676-1-jack@suse.cz>
Date:   Mon, 12 Apr 2021 12:23:30 +0200
From:   Jan Kara <jack@...e.cz>
To:     Ted Tso <tytso@....edu>
Cc:     <linux-ext4@...r.kernel.org>, Eric Whitney <enwlinux@...il.com>,
        <linux-fsdevel@...r.kernel.org>,
        "Darrick J . Wong" <djwong@...nel.org>, Jan Kara <jack@...e.cz>
Subject: [PATCH 0/3] ext4: Fix data corruption when extending DIO write races with buffered read

Hello,

This patch series fixes a bug manifesting as occasional generic/418 failure
when direct IO write extending a file races with buffered read. Patch 1
extends iomap DIO code to pass original IO size to ->end_dio handler so that
ext4 can tell whether everything has succeeded and we don't need expensive
DIO cleanup (possible truncate of leftover blocks beyond i_size). Patch 2
fixes the ext4 bug, patch 3 fixes unrelated problem I've found in ext4 DIO
code.

								Honza