From: Pedro Fonseca <pfonseca@mpi-sws.org>
To: linux-fsdevel@vger.kernel.org
Cc: viro@zeniv.linux.org.uk, Theodore Ts'o <tytso@mit.edu>
Subject: Re: Data races in generic_fillattr()
Date: Thu, 24 Apr 2014 13:55:24 +0200 [thread overview]
Message-ID: <5358FBAC.5060207@mpi-sws.org> (raw)
In-Reply-To: <534C27E0.9040401@mpi-sws.org>
Anybody had a chance to look at this?
Pedro
On 04/14/2014 08:24 PM, Pedro Fonseca wrote:
> Hi,
>
> I've noticed that the function generic_fillattr() (fs/stat.c) in
> involved in multiple data races. Initially I reported this problem on
> the ext4 mailing list but it seems to be more general to the VFS layer.
>
> Because of limited locking, when the inodes are updated and a stat()
> system call is concurrently executed, several 64-bit fields (e.g.,
> atime, mtime, ctime, blocks) can potentially get incorrect values on
> 32-bit architectures. In addition, it seems that it can also cause
> inconsistencies between the "blocks" field and the "size" field.
>
> I would be glad if you could have a look at this problem and let me
> know if it's going to be fixed.
>
> Thanks,
> Pedro
prev parent reply other threads:[~2014-04-24 11:55 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-14 18:24 Data races in generic_fillattr() Pedro Fonseca
2014-04-24 11:55 ` Pedro Fonseca [this message]
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