From: "David Hildenbrand (Arm)" <david@kernel.org>
To: Lorenzo Stoakes <ljs@kernel.org>,
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>,
Mike Rapoport <rppt@kernel.org>, Michal Hocko <mhocko@suse.com>,
Uladzislau Rezki <urezki@gmail.com>,
Toshi Kani <toshi.kani@hpe.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Andy Lutomirski <luto@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Kiryl Shutsemau <kas@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Dev Jain <dev.jain@arm.com>,
Ryan Roberts <ryan.roberts@arm.com>
Cc: David Carlier <devnexen@gmail.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
stable@vger.kernel.org
Subject: Re: [PATCH mm-hotfixes v3 4/4] arm64: remove redundant concurrent ptdump UAF mitigation
Date: Thu, 16 Jul 2026 12:00:22 +0200 [thread overview]
Message-ID: <75f22aba-69ed-4979-8589-b38462e8e03a@kernel.org> (raw)
In-Reply-To: <20260714-series-vmap-race-fix-v3-4-b812eccfa0f9@kernel.org>
On 7/14/26 19:24, Lorenzo Stoakes wrote:
> This partially reverts commit fa93b45fd397 ("arm64: Enable vmalloc-huge
> with ptdump"), retaining vmalloc-huge support but eliminating the now
> redundant mitigation against a race between huge vmap page table freeing
> and ptdump, as this issue has now been fixed at core.
>
> We also simultaneously remove the arm64 if-deffery when acquiring the mmap
> read lock upon vmap huge page table promotion as it is no longer required.
>
> Note that this patch relies on the preceding vmalloc patch, and should not
> be backported alone.
>
> Fixes: fa93b45fd397 ("arm64: Enable vmalloc-huge with ptdump")
> Cc: stable@vger.kernel.org
> Reviewed-by: Dev Jain <dev.jain@arm.com>
> Acked-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
> Signed-off-by: Lorenzo Stoakes <ljs@kernel.org>
> Acked-by: Kiryl Shutsemau (Meta) <kas@kernel.org>
> Acked-by: Will Deacon <will@kernel.org>
> ---
Reviewed-by: David Hildenbrand (Arm) <david@kernel.org>
--
Cheers,
David
next prev parent reply other threads:[~2026-07-16 10:00 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-14 17:24 [PATCH mm-hotfixes v3 0/4] mm: fix UAF caused by race between ptdump and vmap pgtable freeing Lorenzo Stoakes
2026-07-14 17:24 ` [PATCH mm-hotfixes v3 1/4] mm/vmalloc: acquire init_mm lock on huge vmap to avoid ptdump UAF Lorenzo Stoakes
2026-07-15 10:34 ` Kiryl Shutsemau
2026-07-15 14:16 ` Lorenzo Stoakes (ARM)
2026-07-15 19:14 ` Andrew Morton
2026-07-16 9:54 ` Lorenzo Stoakes (ARM)
2026-07-16 9:53 ` David Hildenbrand (Arm)
2026-07-16 10:00 ` David Hildenbrand (Arm)
2026-07-14 17:24 ` [PATCH mm-hotfixes v3 2/4] x86/mm/pat: acquire mmap lock on page table free " Lorenzo Stoakes
2026-07-14 17:29 ` Dave Hansen
2026-07-15 8:49 ` Lorenzo Stoakes (ARM)
2026-07-15 15:24 ` Will Deacon
2026-07-15 15:49 ` Mike Rapoport
2026-07-16 10:06 ` Lorenzo Stoakes (ARM)
2026-07-16 11:31 ` Will Deacon
2026-07-16 13:29 ` Lorenzo Stoakes (ARM)
2026-07-16 9:55 ` David Hildenbrand (Arm)
2026-07-14 17:24 ` [PATCH mm-hotfixes v3 3/4] mm/ptdump: always stabilise against page table freeing using init_mm Lorenzo Stoakes
2026-07-15 10:36 ` Kiryl Shutsemau
2026-07-16 9:59 ` David Hildenbrand (Arm)
2026-07-14 17:24 ` [PATCH mm-hotfixes v3 4/4] arm64: remove redundant concurrent ptdump UAF mitigation Lorenzo Stoakes
2026-07-16 10:00 ` David Hildenbrand (Arm) [this message]
2026-07-14 17:31 ` [PATCH mm-hotfixes v3 0/4] mm: fix UAF caused by race between ptdump and vmap pgtable freeing Dave Hansen
2026-07-15 7:28 ` Lorenzo Stoakes (ARM)
2026-07-14 19:11 ` Andrew Morton
2026-07-15 8:31 ` Lorenzo Stoakes (ARM)
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