From: Kiryl Shutsemau <kas@kernel.org>
To: Lorenzo Stoakes <ljs@kernel.org>
Cc: 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>,
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>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will@kernel.org>, Dev Jain <dev.jain@arm.com>,
Ryan Roberts <ryan.roberts@arm.com>,
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 v2 4/4] arm64: remove redundant concurrent ptdump UAF mitigation
Date: Mon, 13 Jul 2026 18:21:46 +0100 [thread overview]
Message-ID: <alUeafMBZtSp8XTd@thinkstation> (raw)
In-Reply-To: <20260712-series-vmap-race-fix-v2-4-ad134cc3a12a@kernel.org>
On Sun, Jul 12, 2026 at 11:42:27AM +0100, 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>
--
Kiryl Shutsemau / Kirill A. Shutemov
next prev parent reply other threads:[~2026-07-13 17:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-12 10:42 [PATCH mm-hotfixes v2 0/4] mm: fix UAF caused by race between ptdump and vmap pgtable freeing Lorenzo Stoakes
2026-07-12 10:42 ` [PATCH mm-hotfixes v2 1/4] mm/vmalloc: acquire init_mm lock on huge vmap to avoid ptdump UAF Lorenzo Stoakes
2026-07-12 13:17 ` Dev Jain
2026-07-13 16:42 ` Kiryl Shutsemau
2026-07-12 10:42 ` [PATCH mm-hotfixes v2 2/4] x86/mm/pat: acquire mmap lock on page table free " Lorenzo Stoakes
2026-07-12 16:53 ` Borislav Petkov
2026-07-12 10:42 ` [PATCH mm-hotfixes v2 3/4] mm/ptdump: always stabilise against page table freeing using init_mm Lorenzo Stoakes
2026-07-13 17:19 ` Kiryl Shutsemau
2026-07-12 10:42 ` [PATCH mm-hotfixes v2 4/4] arm64: remove redundant concurrent ptdump UAF mitigation Lorenzo Stoakes
2026-07-13 11:40 ` Will Deacon
2026-07-13 17:21 ` Kiryl Shutsemau [this message]
[not found] ` <alTn7NguEW_4bodu@thinkstation>
2026-07-13 15:54 ` [PATCH mm-hotfixes v2 0/4] mm: fix UAF caused by race between ptdump and vmap pgtable freeing Lorenzo Stoakes (ARM)
2026-07-13 16:32 ` Kiryl Shutsemau
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