linux-kernel - Re: CVE-2024-26904: btrfs: fix data race at btrfs_use_block

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Message-ID: <2024052155-raking-onshore-f6f3@gregkh>
Date: Tue, 21 May 2024 09:05:27 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Filipe Manana <fdmanana@...nel.org>
Cc: cve@...nel.org, linux-kernel@...r.kernel.org,
	linux-cve-announce@...r.kernel.org
Subject: Re: CVE-2024-26904: btrfs: fix data race at btrfs_use_block_rsv()
 when accessing block reserve

On Mon, May 20, 2024 at 05:23:14PM +0100, Filipe Manana wrote:
> On Wed, Apr 17, 2024 at 12:29:19PM +0200, Greg Kroah-Hartman wrote:
> > Description
> > ===========
> > 
> > In the Linux kernel, the following vulnerability has been resolved:
> > 
> > btrfs: fix data race at btrfs_use_block_rsv() when accessing block reserve
> 
> May I ask why is this classified a CVE?
> 
> How can a malicious user exploit this to do something harmful?
> 
> The race was solved to silence KCSAN warnings, as from time to time we have
> someone reporting it, but other than that, it should be harmless.

Oops, you are right, the line "BUG:" triggered our review to tag this as
a CVE.  I'll go reject it now, thanks for the review.

greg k-h