linux-kernel - Re: [PATCH 01/12] Revert "mm: pgtable: make ptlock be freed by RCU"

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Message-ID: <eef6abd4-327b-4f7c-8b3f-b2552fa78952@bytedance.com>
Date: Mon, 16 Dec 2024 14:15:35 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Yu Zhao <yuzhao@...gle.com>, peterz@...radead.org, tglx@...utronix.de,
 david@...hat.com, jannh@...gle.com, hughd@...gle.com, willy@...radead.org,
 muchun.song@...ux.dev, vbabka@...nel.org, lorenzo.stoakes@...cle.com,
 rientjes@...gle.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/12] Revert "mm: pgtable: make ptlock be freed by RCU"

Hi Andrew,

On 2024/12/16 14:10, Andrew Morton wrote:
> On Sun, 15 Dec 2024 14:29:38 +0800 Qi Zheng <zhengqi.arch@...edance.com> wrote:
> 
>>>
>>> Acked-by: Yu Zhao <yuzhao@...gle.com>
>>
>> Thanks! Once the review of this patch series is completed, we can simply
>> drop "mm: pgtable: make ptlock be freed by RCU" from mm tree.
> 
> Can we drop it now and does the remainder of the series "synchronously
> scan and reclaim empty user PTE pages v4" remain valid and useful?

The "mm: pgtable: make ptlock be freed by RCU" fixes the UAF issue [1]
reported by syzbot. If it is dropped now and this patch series is not
merged, the UAF issue will reappear.

[1]. 
https://lore.kernel.org/lkml/67548279.050a0220.a30f1.015b.GAE@google.com/

Thanks,
Qi

>