linux-kernel - Re: [PATCH hotfix 6.12 v2 4/8] mm: resolve faulty mmap

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Message-ID: <0d3237d7-cb70-4979-b262-29ffe7d7a608@sirena.org.uk>
Date: Tue, 29 Oct 2024 12:33:13 +0000
From: Mark Brown <broonie@...nel.org>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Cc: Vlastimil Babka <vbabka@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jann Horn <jannh@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Peter Xu <peterx@...hat.com>,
	linux-arm-kernel@...ts.infradead.org,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Aishwarya TCV <Aishwarya.TCV@....com>
Subject: Re: [PATCH hotfix 6.12 v2 4/8] mm: resolve faulty mmap_region()
 error path behaviour

On Mon, Oct 28, 2024 at 10:14:50PM +0000, Lorenzo Stoakes wrote:

> It doesn't make sense to have shmem explicitly check this one arch-specific
> case, it is arch-specific, so the arch should handle it. We know shmem is a
> case in which we want to permit MTE, so simply check for this directly.
> 
> This also fixes the issue with checking arch_validate_flags() early, which
> would otherwise break mmap_region().

The relevant tests all pass with this on today's pending-fixes.

Tested-by: Mark Brown <broonie@...nel.org>

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