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Howlett" To: Yu Kuai Cc: Chuck Lever III , Greg KH , linux-stable , "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 Vetter , Al Viro , Christian Brauner , Andrew Morton , Hugh Dickins , "Matthew Wilcox (Oracle)" , Sasha Levin , "srinivasan.shanmugam@amd.com" , "chiahsuan.chung@amd.com" , "mingo@kernel.org" , "mgorman@techsingularity.net" , "chengming.zhou@linux.dev" , "zhangpeng.00@bytedance.com" , "amd-gfx@lists.freedesktop.org" , "dri-devel@lists.freedesktop.org" , Linux Kernel Mailing List , Linux FS Devel , "maple-tree@lists.infradead.org" , linux-mm , "yi.zhang@huawei.com" , yangerkun , "yukuai (C)" Subject: Re: [PATCH 6.6 00/28] fix CVE-2024-46701 Message-ID: Mail-Followup-To: "Liam R. Howlett" , Yu Kuai , Chuck Lever III , Greg KH , linux-stable , "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 Vetter , Al Viro , Christian Brauner , Andrew Morton , Hugh Dickins , "Matthew Wilcox (Oracle)" , Sasha Levin , "srinivasan.shanmugam@amd.com" , "chiahsuan.chung@amd.com" , "mingo@kernel.org" , "mgorman@techsingularity.net" , "chengming.zhou@linux.dev" , "zhangpeng.00@bytedance.com" , "amd-gfx@lists.freedesktop.org" , "dri-devel@lists.freedesktop.org" , Linux Kernel Mailing List , Linux FS Devel , "maple-tree@lists.infradead.org" , linux-mm , "yi.zhang@huawei.com" , yangerkun , "yukuai (C)" References: <20241024132009.2267260-1-yukuai1@huaweicloud.com> <2024110625-earwig-deport-d050@gregkh> <7AB98056-93CC-4DE5-AD42-49BA582D3BEF@oracle.com> <8bdd405e-0086-5441-e185-3641446ba49d@huaweicloud.com> Content-Type: text/plain; charset=utf-8 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Kuai [241106 19:57]: > Hi, >=20 > =E5=9C=A8 2024/11/06 23:19, Chuck Lever III =E5=86=99=E9=81=93: > >=20 > >=20 > > > On Nov 6, 2024, at 1:16=E2=80=AFAM, Greg KH wrote: > > >=20 > > > On Thu, Oct 24, 2024 at 09:19:41PM +0800, Yu Kuai wrote: > > > > From: Yu Kuai > > > >=20 > > > > Fix patch is patch 27, relied patches are from: > >=20 > > I assume patch 27 is: > >=20 > > libfs: fix infinite directory reads for offset dir > >=20 > > https://lore.kernel.org/stable/20241024132225.2271667-12-yukuai1@huawei= cloud.com/ > >=20 > > I don't think the Maple tree patches are a hard > > requirement for this fix. And note that libfs did > > not use Maple tree originally because I was told > > at that time that Maple tree was not yet mature. > >=20 > > So, a better approach might be to fit the fix > > onto linux-6.6.y while sticking with xarray. >=20 > The painful part is that using xarray is not acceptable, the offet > is just 32 bit and if it overflows, readdir will read nothing. That's > why maple_tree has to be used. Why does the xarray cause it to overflow vs the maple tree? The maple tree conversion was for performance reasons, as far as I know [1]. Thanks, Liam [1]. https://lore.kernel.org/all/170820083431.6328.16233178852085891453.stg= it@91.116.238.104.host.secureserver.net/ >=20 > Thanks, > Kuai >=20 > >=20 > > This is the first I've heard of this CVE. It > > would help if the patch authors got some > > notification when these are filed. > >=20 > >=20 > > > > - patches from set [1] to add helpers to maple_tree, the last patch= to > > > > improve fork() performance is not backported; > > >=20 > > > So things slowed down? > > >=20 > > > > - patches from set [2] to change maple_tree, and follow up fixes; > > > > - patches from set [3] to convert offset_ctx from xarray to maple_t= ree; > > > >=20 > > > > Please notice that I'm not an expert in this area, and I'm afraid t= o > > > > make manual changes. That's why patch 16 revert the commit that is > > > > different from mainline and will cause conflict backporting new pat= ches. > > > > patch 28 pick the original mainline patch again. > > > >=20 > > > > (And this is what we did to fix the CVE in downstream kernels). > > > >=20 > > > > [1] https://lore.kernel.org/all/20231027033845.90608-1-zhangpeng.00= @bytedance.com/ > > > > [2] https://lore.kernel.org/all/20231101171629.3612299-2-Liam.Howle= tt@oracle.com/T/ > > > > [3] https://lore.kernel.org/all/170820083431.6328.16233178852085891= 453.stgit@91.116.238.104.host.secureserver.net/ > > >=20 > > > This series looks rough. I want to have the maintainers of these > > > files/subsystems to ack this before being able to take them. > > >=20 > > > thanks, > > >=20 > > > greg k-h > >=20 > > -- > > Chuck Lever > >=20 > >=20 >=20