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Date: Wed, 6 Nov 2024 07:16:00 +0100
From: Greg KH <gregkh@linuxfoundation.org>
To: Yu Kuai <yukuai1@huaweicloud.com>
Cc: stable@vger.kernel.org, harry.wentland@amd.com, sunpeng.li@amd.com,
	Rodrigo.Siqueira@amd.com, alexander.deucher@amd.com,
	christian.koenig@amd.com, Xinhui.Pan@amd.com, airlied@gmail.com,
	daniel@ffwll.ch, viro@zeniv.linux.org.uk, brauner@kernel.org,
	Liam.Howlett@oracle.com, akpm@linux-foundation.org,
	hughd@google.com, willy@infradead.org, sashal@kernel.org,
	srinivasan.shanmugam@amd.com, chiahsuan.chung@amd.com,
	mingo@kernel.org, mgorman@techsingularity.net, yukuai3@huawei.com,
	chengming.zhou@linux.dev, zhangpeng.00@bytedance.com,
	chuck.lever@oracle.com, amd-gfx@lists.freedesktop.org,
	dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, maple-tree@lists.infradead.org,
	linux-mm@kvack.org, yi.zhang@huawei.com, yangerkun@huawei.com
Subject: Re: [PATCH 6.6 00/28] fix CVE-2024-46701
Message-ID: <2024110625-earwig-deport-d050@gregkh>
References: <20241024132009.2267260-1-yukuai1@huaweicloud.com>
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In-Reply-To: <20241024132009.2267260-1-yukuai1@huaweicloud.com>

On Thu, Oct 24, 2024 at 09:19:41PM +0800, Yu Kuai wrote:
> From: Yu Kuai <yukuai3@huawei.com>
> 
> Fix patch is patch 27, relied patches are from:
> 
>  - patches from set [1] to add helpers to maple_tree, the last patch to
> improve fork() performance is not backported;

So things slowed down?

>  - patches from set [2] to change maple_tree, and follow up fixes;
>  - patches from set [3] to convert offset_ctx from xarray to maple_tree;
> 
> Please notice that I'm not an expert in this area, and I'm afraid to
> make manual changes. That's why patch 16 revert the commit that is
> different from mainline and will cause conflict backporting new patches.
> patch 28 pick the original mainline patch again.
> 
> (And this is what we did to fix the CVE in downstream kernels).
> 
> [1] https://lore.kernel.org/all/20231027033845.90608-1-zhangpeng.00@bytedance.com/
> [2] https://lore.kernel.org/all/20231101171629.3612299-2-Liam.Howlett@oracle.com/T/
> [3] https://lore.kernel.org/all/170820083431.6328.16233178852085891453.stgit@91.116.238.104.host.secureserver.net/

This series looks rough.  I want to have the maintainers of these
files/subsystems to ack this before being able to take them.

thanks,

greg k-h