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From: Andrew Morton <akpm@linux-foundation.org>
To: Lorenzo Stoakes <ljs@kernel.org>
Cc: 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>,
	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>,
	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,
	syzbot+fd95a72470f5a44e464c@syzkaller.appspotmail.com
Subject: Re: [PATCH mm-hotfixes v3 0/4] mm: fix UAF caused by race between ptdump and vmap pgtable freeing
Date: Tue, 14 Jul 2026 12:11:02 -0700	[thread overview]
Message-ID: <20260714121102.9cb28d080556c94d45a6bc3e@linux-foundation.org> (raw)
In-Reply-To: <20260714-series-vmap-race-fix-v3-0-b812eccfa0f9@kernel.org>

On Tue, 14 Jul 2026 18:24:22 +0100 Lorenzo Stoakes <ljs@kernel.org> wrote:

> Kernel page table walkers fall into two broad categories - those ranges
> where no exclusion is required via walk_kernel_page_table_range_lockless()
> and those where exclusion is required via walk_kernel_page_table_range()
> or walk_page_range_debug().
> 
> ...
>
> This series works around this by #ifndef CONFIG_ARM64'ing the mmap read
> lock in vmap logic, then partially reverting commit fa93b45fd397 ("arm64:
> Enable vmalloc-huge with ptdump"), keeping the enablement of huge vmap
> support, and removing the ifdeffery with the partial revert patch.

Thanks, I've updated mm-hotfixes-unstable.

> v3:
> * Rebased on latest master of Linus's tree.
> * Accumulated tags, thanks everybody!
> * Reworded commit messages as per Kiryl and Boris.

I've confirmed that v3 introduced no code alterations.


  parent reply	other threads:[~2026-07-14 19:11 UTC|newest]

Thread overview: 18+ 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
2026-07-14 17:40   ` sashiko-bot
2026-07-15 10:34   ` Kiryl Shutsemau
2026-07-15 14:16     ` Lorenzo Stoakes (ARM)
2026-07-15 19:14       ` Andrew Morton
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
2026-07-14 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
2026-07-14 17:24 ` [PATCH mm-hotfixes v3 4/4] arm64: remove redundant concurrent ptdump UAF mitigation Lorenzo Stoakes
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 [this message]
2026-07-15  8:31   ` Lorenzo Stoakes (ARM)

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