linux-kernel - Re: [PATCH v4 1/1] exec: seal system mappings

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Message-ID: <553df4d7ddadb0580a2c35fcf8d5b8c3aca69449.camel@sipsolutions.net>
Date: Tue, 04 Feb 2025 19:17:28 +0100
From: Johannes Berg <johannes@...solutions.net>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>, Kees Cook
 <kees@...nel.org>, 	jeffxu@...omium.org, akpm@...ux-foundation.org,
 keescook@...omium.org, 	jannh@...gle.com, torvalds@...ux-foundation.org,
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 	groeck@...omium.org, mpe@...erman.id.au, Vlastimil Babka <vbabka@...e.cz>,
  Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Andrei Vagin
 <avagin@...il.com>, Dmitry Safonov <0x7f454c46@...il.com>,  Mike Rapoport
 <mike.rapoport@...il.com>, Alexander Mikhalitsyn
 <aleksandr.mikhalitsyn@...onical.com>
Subject: Re: [PATCH v4 1/1] exec: seal system mappings

On Fri, 2025-01-03 at 15:48 -0500, Liam R. Howlett wrote:
> 
> So we have at least two userspace uses that this will breaks: checkpoint
> restore and now gVisor, but who knows what else?

I believe we previously pointed out it might also break running the
ARCH=um kernel:

https://lore.kernel.org/all/2e5de601da34342d8eb0d8319dcf81ff213c7ef0.camel@sipsolutions.net/

johannes