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

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Message-ID: <20250116052655.GA23894@lst.de>
Date: Thu, 16 Jan 2025 06:26:55 +0100
From: Christoph Hellwig <hch@....de>
To: Kees Cook <kees@...nel.org>
Cc: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Jeff Xu <jeffxu@...omium.org>, akpm@...ux-foundation.org,
	jannh@...gle.com, torvalds@...ux-foundation.org,
	adhemerval.zanella@...aro.org, oleg@...hat.com,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
	linux-mm@...ck.org, jorgelo@...omium.org, sroettger@...gle.com,
	ojeda@...nel.org, adobriyan@...il.com, anna-maria@...utronix.de,
	mark.rutland@....com, linus.walleij@...aro.org, Jason@...c4.com,
	deller@....de, rdunlap@...radead.org, davem@...emloft.net,
	hch@....de, peterx@...hat.com, hca@...ux.ibm.com,
	f.fainelli@...il.com, gerg@...nel.org, dave.hansen@...ux.intel.com,
	mingo@...nel.org, ardb@...nel.org, Liam.Howlett@...cle.com,
	mhocko@...e.com, 42.hyeyoo@...il.com, peterz@...radead.org,
	ardb@...gle.com, enh@...gle.com, rientjes@...gle.com,
	groeck@...omium.org, mpe@...erman.id.au,
	Vlastimil Babka <vbabka@...e.cz>, Andrei Vagin <avagin@...il.com>,
	Dmitry Safonov <0x7f454c46@...il.com>,
	Mike Rapoport <mike.rapoport@...il.com>,
	Alexander Mikhalitsyn <aleksandr.mikhalitsyn@...onical.com>,
	Benjamin Berg <benjamin@...solutions.net>
Subject: Re: [PATCH v4 1/1] exec: seal system mappings

On Wed, Jan 15, 2025 at 03:52:23PM -0800, Kees Cook wrote:
> > You seem to be saying you're pushing an internal feature on upstream and
> > only care about internal use cases, this is not how upstream works, as
> > Matthew alludes to.
> 
> Internal? No. Chrome OS and Android. Linux runs more Android devices
> than everything else in the world combined -- this is not some random
> experiment.

All of which are tightly controlled by Google and not actually open
to users.  Which doesn't say they don't matter, but they matter a
lot less than fetures widely useful to the open not locked down
userbase of classic Linux.