linux-kernel - Re: [PATCH v2] mmu_gather: move tlb flush for VM_PFNMAP/VM_MIXEDMAP vmas into free

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Message-ID: <20250124090431.GA3861@noisy.programming.kicks-ass.net>
Date: Fri, 24 Jan 2025 10:04:31 +0100
From: Peter Zijlstra <peterz@...radead.org>
To: Hugh Dickins <hughd@...gle.com>
Cc: Jann Horn <jannh@...gle.com>, Roman Gushchin <roman.gushchin@...ux.dev>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Will Deacon <will@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
	Nick Piggin <npiggin@...il.com>, linux-arch@...r.kernel.org
Subject: Re: [PATCH v2] mmu_gather: move tlb flush for VM_PFNMAP/VM_MIXEDMAP
 vmas into free_pgtables()

On Fri, Jan 24, 2025 at 09:31:39AM +0100, Peter Zijlstra wrote:
> On Thu, Jan 23, 2025 at 08:42:36PM -0800, Hugh Dickins wrote:
> > The changelog of commit b67fbebd4cf9 ("mmu_gather: Force tlb-flush
> > VM_PFNMAP vmas") has not helped me either.  Nor could I locate any
> > discussion (Jann, Linus, Peter, Will?) that led up to it.
> 
> Hmm, that was probably on security -- I should have those mails around
> somewhere, I'll see if I can dig them up.

Hugh, I've bounced you a copy of Jann's original report on the issue.

Subject: unmap_mapping_range() race with munmap() on VM_PFNMAP mappings leads to stale TLB entry