From: Chris Li <chrisl@kernel.org>
To: Yosry Ahmed <yosryahmed@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Nhat Pham <nphamcs@gmail.com>,
Chengming Zhou <zhouchengming@bytedance.com>,
Huang Ying <ying.huang@intel.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 2/2] mm: zswap: remove unnecessary tree cleanups in zswap_swapoff()
Date: Thu, 25 Jan 2024 17:09:43 -0800 [thread overview]
Message-ID: <CAF8kJuN25avTEgNTXdoz7N9eRuNTCdtGLA_kCuKB=_TRYT48cA@mail.gmail.com> (raw)
In-Reply-To: <CAJD7tkYFX98TZGiiBwXRtiJM_zEphzLq-vNXNyrzun8gTRLuGw@mail.gmail.com>
Hi Yosry,
On Thu, Jan 25, 2024 at 2:34 PM Yosry Ahmed <yosryahmed@google.com> wrote:
>
> > > problem is that after the entry is isolated from the zswap LRU, we
> > > need to grab the tree lock to make sure it's still there and get a
> > > ref, and just trying to lock the tree may be a UAF if we race with
> > > swapoff.
> >
> > I feel it is very wrong to have the tree freed while having
> > outstanding entry allocationed from the tree pending.
> > I would want to avoid that situation if possible.
>
> This should be the case with Chengming's solution.
Thanks for confirming. Looking forward to Chenming's patch.
Chris
next prev parent reply other threads:[~2024-01-26 1:09 UTC|newest]
Thread overview: 47+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-01-20 2:40 [PATCH 0/2] mm: zswap: simplify zswap_swapoff() Yosry Ahmed
2024-01-20 2:40 ` [PATCH 1/2] mm: swap: update inuse_pages after all cleanups are done Yosry Ahmed
2024-01-22 13:17 ` Chengming Zhou
2024-01-23 8:59 ` Huang, Ying
2024-01-23 9:40 ` Yosry Ahmed
2024-01-23 9:54 ` Yosry Ahmed
2024-01-24 3:13 ` Huang, Ying
2024-01-24 3:20 ` Yosry Ahmed
2024-01-24 3:27 ` Huang, Ying
2024-01-24 4:15 ` Yosry Ahmed
2024-01-20 2:40 ` [PATCH 2/2] mm: zswap: remove unnecessary tree cleanups in zswap_swapoff() Yosry Ahmed
2024-01-22 13:13 ` Chengming Zhou
2024-01-22 20:19 ` Johannes Weiner
2024-01-22 20:39 ` Yosry Ahmed
2024-01-23 15:38 ` Johannes Weiner
2024-01-23 15:54 ` Yosry Ahmed
2024-01-23 20:12 ` Johannes Weiner
2024-01-23 21:02 ` Yosry Ahmed
2024-01-24 6:57 ` Yosry Ahmed
2024-01-25 5:28 ` Chris Li
2024-01-25 7:59 ` Yosry Ahmed
2024-01-25 18:55 ` Chris Li
2024-01-25 20:57 ` Yosry Ahmed
2024-01-25 22:31 ` Chris Li
2024-01-25 22:33 ` Yosry Ahmed
2024-01-26 1:09 ` Chris Li [this message]
2024-01-24 7:20 ` Chengming Zhou
2024-01-25 5:44 ` Chris Li
2024-01-25 8:01 ` Yosry Ahmed
2024-01-25 19:03 ` Chris Li
2024-01-25 21:01 ` Yosry Ahmed
2024-01-25 7:53 ` Yosry Ahmed
2024-01-25 8:03 ` Yosry Ahmed
2024-01-25 8:30 ` Chengming Zhou
2024-01-25 8:42 ` Yosry Ahmed
2024-01-25 8:52 ` Chengming Zhou
2024-01-25 9:03 ` Yosry Ahmed
2024-01-25 9:22 ` Chengming Zhou
2024-01-25 9:26 ` Yosry Ahmed
2024-01-25 9:38 ` Chengming Zhou
2024-01-26 0:03 ` Chengming Zhou
2024-01-26 0:05 ` Yosry Ahmed
2024-01-26 0:10 ` Chengming Zhou
2024-01-23 20:30 ` Nhat Pham
2024-01-23 21:04 ` Yosry Ahmed
2024-01-22 21:21 ` Nhat Pham
2024-01-22 22:31 ` Chris Li
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