linux-ext4 - Re: [PATCH 6.1 788/885] ext4: Fix possible corruption when moving a directory

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: <ZAePHuuAGo7I1VOc@gmail.com>
Date:   Tue, 7 Mar 2023 19:23:10 +0000
From:   Eric Biggers <ebiggers@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     stable@...r.kernel.org, patches@...ts.linux.dev,
        Jan Kara <jack@...e.cz>, Theodore Tso <tytso@....edu>,
        linux-ext4@...r.kernel.org
Subject: Re: [PATCH 6.1 788/885] ext4: Fix possible corruption when moving a
 directory

On Tue, Mar 07, 2023 at 06:02:02PM +0100, Greg Kroah-Hartman wrote:
> From: Jan Kara <jack@...e.cz>
> 
> commit 0813299c586b175d7edb25f56412c54b812d0379 upstream.
> 
> When we are renaming a directory to a different directory, we need to
> update '..' entry in the moved directory. However nothing prevents moved
> directory from being modified and even converted from the inline format
> to the normal format. When such race happens the rename code gets
> confused and we crash. Fix the problem by locking the moved directory.
> 
> CC: stable@...r.kernel.org
> Fixes: 32f7f22c0b52 ("ext4: let ext4_rename handle inline dir")
> Signed-off-by: Jan Kara <jack@...e.cz>
> Link: https://lore.kernel.org/r/20230126112221.11866-1-jack@suse.cz
> Signed-off-by: Theodore Ts'o <tytso@....edu>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

This commit has a reported regression
(https://lore.kernel.org/linux-ext4/5efbe1b9-ad8b-4a4f-b422-24824d2b775c@kili.mountain),
so probably it should not be backported quite yet.

- Eric