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Date: Tue, 14 Jul 2026 12:11:02 -0700
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
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 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
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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.