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

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Message-ID: <nycvar.YFH.7.76.2402291824020.13421@cbobk.fhfr.pm>
Date: Thu, 29 Feb 2024 18:36:08 +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, Jiri Kosina wrote:

> - 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

To elaborate on this a little bit more -- I completely agree that this fix 
is completely in-line with what Kees is, in my view, quite nicely 
describing at [1]. You pointed to a weakness (for which a fix *is* in our 
queue), sure.

But I see a HUGE leap from "fixes a weakness" to bold, aggressive and in 
my view exaggerating statements a-la "I am able to trivially pwn any 
kernel which is not -stable".

[1] https://lore.kernel.org/all/D06F40E5-0DBC-4FF2-BAF5-2373BDF3815C@kernel.org/

-- 
Jiri Kosina
SUSE Labs