linux-kernel - Re: CVE-2023-52451: powerpc/pseries/memhp: Fix access beyond end of drmem array

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Message-ID: <nycvar.YFH.7.76.2402291754020.13421@cbobk.fhfr.pm>
Date: Thu, 29 Feb 2024 18:11:40 +0100 (CET)
From: Jiri Kosina <jikos@...nel.org>
To: Sasha Levin <sashal@...nel.org>
cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
    Michal Hocko <mhocko@...e.com>, Kees Cook <keescook@...omium.org>, 
    cve@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: CVE-2023-52451: powerpc/pseries/memhp: Fix access beyond end of
 drmem array

On Thu, 29 Feb 2024, Sasha Levin wrote:

> >> It's pretty trivial to get root on most of the "enterprise" kernels
> >
> >Wow, that's a very strong statement you are making here, and I'd now
> >really like to ask you to back that up with some real data.
> 
> Is something like https://www.suse.com/security/cve/CVE-2023-52447.html
> a good example?

- this fix is on our list/queue to be integrated into one of our kernel 
  branches, and was even beore it just got CVE assigned, as it references 
  a commit in Fixes: that we have present in one of our branches, but 
  hasn't been processed yet, mainly because we don't allow unprivileged 
  BPF

- you pointed to a fix for UAF in BPF, which definitely is a good fix to 
  have, I don't even dispute that CVE is justified in this particular 
  case. What I haven't yet seen though how this connects to in my view 
  rather serious 'trivial to get root' statement

Thanks,

-- 
Jiri Kosina
SUSE Labs