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Message-ID: <7a604ae4-063f-48ff-a92f-014d1cf86adc@huawei.com>
Date: Thu, 20 Mar 2025 19:17:47 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: Toke Høiland-Jørgensen <toke@...hat.com>, Yunsheng
Lin <yunshenglin0825@...il.com>, "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>,
Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>, Tariq
Toukan <tariqt@...dia.com>, Andrew Lunn <andrew+netdev@...n.ch>, Eric Dumazet
<edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, Ilias Apalodimas
<ilias.apalodimas@...aro.org>, Simon Horman <horms@...nel.org>, Andrew Morton
<akpm@...ux-foundation.org>, Mina Almasry <almasrymina@...gle.com>, Yonglong
Liu <liuyonglong@...wei.com>, Pavel Begunkov <asml.silence@...il.com>,
Matthew Wilcox <willy@...radead.org>, Robin Murphy <robin.murphy@....com>,
IOMMU <iommu@...ts.linux.dev>, <segoon@...nwall.com>, <solar@...nwall.com>,
<oss-security@...ts.openwall.com>, <kernel-hardening@...ts.openwall.com>
CC: <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
<linux-rdma@...r.kernel.org>, <linux-mm@...ck.org>, Qiuling Ren
<qren@...hat.com>, Yuying Ma <yuma@...hat.com>
Subject: Re: [PATCH net-next 3/3] page_pool: Track DMA-mapped pages and unmap
them when destroying the pool
On 2025/3/19 20:18, Toke Høiland-Jørgensen wrote:
>>
>> All I asked is about moving PP_MAGIC_MASK macro into poison.h if you
>> still want to proceed with reusing the page->pp_magic as the masking and
>> the signature to be masked seems reasonable to be in the same file.
>
> Hmm, my thinking was that this would be a lot of irrelevant stuff to put
> into poison.h, but I suppose we could do so if the mm folks don't object :)
The masking and the signature to be masked is correlated, I am not sure
what you meant by 'irrelevant stuff' here.
As you seemed to have understood most of my concern about reusing
page->pp_magic, I am not going to argue with you about the uncertainty
of security and complexity of different address layout for different
arches again.
But I am still think it is not the way forward with the reusing of
page->pp_magic through doing some homework about the 'POISON_POINTER'.
If you still think my idea is complex and still want to proceed with
reusing the space of page->pp_magic, go ahead and let the maintainers
decide if it is worth the security risk and performance degradation.
>
> -Toke
>
>
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