linux-kernel - Re: CVE-2023-52521: bpf: Annotate bpf_long_memcpy with data

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Date: Tue, 5 Mar 2024 22:22:52 +0000
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Michal Hocko <mhocko@...e.com>
Cc: cve@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: CVE-2023-52521: bpf: Annotate bpf_long_memcpy with data_race

On Tue, Mar 05, 2024 at 05:54:45PM +0100, Michal Hocko wrote:
> On Sat 02-03-24 22:53:05, Greg KH wrote:
> > Description
> > ===========
> > 
> > In the Linux kernel, the following vulnerability has been resolved:
> > 
> > bpf: Annotate bpf_long_memcpy with data_race
> > 
> > syzbot reported a data race splat between two processes trying to
> > update the same BPF map value via syscall on different CPUs:
> > 
> >   BUG: KCSAN: data-race in bpf_percpu_array_update / bpf_percpu_array_update
> 
> I would like to dispute this CVE. It adds data_race annotation which
> doesn't have any impact on the code generation.

Ah, my fault, I thought the "BUG: KCSAN:" line was a real BUG() call,
it's just a syslog dump, good catch.

I'll go revoke this now, thanks for the review!

greg k-h