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 13:57:40 +0100 [thread overview]
Message-ID: <alDnFGncVvcjsvTg@lucifer> (raw)
In-Reply-To: <20260710-series-vmap-race-fix-v1-1-5b3794c113fe@kernel.org>
As per Sashiko, we need to account for x86's slightly bat... interesting
ptdump of non-init_mm page tables.
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
next prev parent reply other threads:[~2026-07-10 12:58 UTC|newest]
Thread overview: 9+ 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 [this message]
2026-07-10 13:24 ` Lorenzo Stoakes
2026-07-11 10:23 ` Mike Rapoport
2026-07-10 10:49 ` [PATCH 2/2] Revert "arm64: Enable vmalloc-huge with ptdump" Lorenzo Stoakes
2026-07-11 10:15 ` Mike Rapoport
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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