From: Lorenzo Stoakes <ljs@kernel.org>
To: Andrew Morton <akpm@linux-foundation.org>,
Suren Baghdasaryan <surenb@google.com>,
"Liam R. Howlett" <liam@infradead.org>,
Vlastimil Babka <vbabka@kernel.org>,
Shakeel Butt <shakeel.butt@linux.dev>,
David Hildenbrand <david@kernel.org>,
Mike Rapoport <rppt@kernel.org>, Michal Hocko <mhocko@suse.com>,
Uladzislau Rezki <urezki@gmail.com>,
Toshi Kani <toshi.kani@hpe.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>
Cc: David Carlier <devnexen@gmail.com>, Dev Jain <dev.jain@arm.com>,
Ryan Roberts <ryan.roberts@arm.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, stable@vger.kernel.org,
syzbot+fd95a72470f5a44e464c@syzkaller.appspotmail.com
Subject: Re: [PATCH 1/2] mm/vmalloc: acquire init_mm read lock on huge vmap promotion
Date: Fri, 10 Jul 2026 14:24:08 +0100 [thread overview]
Message-ID: <alDyT43CLwtBtsAa@lucifer> (raw)
In-Reply-To: <alDnFGncVvcjsvTg@lucifer>
On Fri, Jul 10, 2026 at 01:57:46PM +0100, Lorenzo Stoakes wrote:
> As per Sashiko, we need to account for x86's slightly bat... interesting
> ptdump of non-init_mm page tables.
Well it turns out arm64 also traverses EFI ranges which is kinda the saner end
of it ;)
Patch incoming in any case. Will send separately as each patch stands alone and
this series is fine as-is.
>
> The fix is to take a nested init_mm lock in ptdump_walk_pgd(), which is
> safe as nothing depends on an init_mm lock prior to acquiring an arbitrary
> mm's lock.
>
> I think this could potentially be sent as an entirely separate patch, as it
> doesn't change what this protects against, nor the x86 CPA patch, both of
> which stand on their own.
>
> Cheers, Lorenzo
Cheers, Lorenzo
next prev parent reply other threads:[~2026-07-10 13:24 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-10 10:49 [PATCH 0/2] mm: fix UAF caused by race between ptdump and vmap pgtable freeing Lorenzo Stoakes
2026-07-10 10:49 ` [PATCH 1/2] mm/vmalloc: acquire init_mm read lock on huge vmap promotion Lorenzo Stoakes
2026-07-10 12:57 ` Lorenzo Stoakes
2026-07-10 13:24 ` Lorenzo Stoakes [this message]
2026-07-10 10:49 ` [PATCH 2/2] Revert "arm64: Enable vmalloc-huge with ptdump" Lorenzo Stoakes
2026-07-10 11:44 ` [PATCH 0/2] mm: fix UAF caused by race between ptdump and vmap pgtable freeing David CARLIER
2026-07-10 11:57 ` Lorenzo Stoakes
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