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From: Qi Zheng <zhengqi.arch@bytedance.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Yu Zhao <yuzhao@google.com>,
	peterz@infradead.org, tglx@linutronix.de, david@redhat.com,
	jannh@google.com, hughd@google.com, willy@infradead.org,
	muchun.song@linux.dev, vbabka@kernel.org,
	lorenzo.stoakes@oracle.com, rientjes@google.com,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 01/12] Revert "mm: pgtable: make ptlock be freed by RCU"
Date: Mon, 16 Dec 2024 14:15:35 +0800	[thread overview]
Message-ID: <eef6abd4-327b-4f7c-8b3f-b2552fa78952@bytedance.com> (raw)
In-Reply-To: <20241215221015.a567dbf38c9a98d672aecd3e@linux-foundation.org>

Hi Andrew,

On 2024/12/16 14:10, Andrew Morton wrote:
> On Sun, 15 Dec 2024 14:29:38 +0800 Qi Zheng <zhengqi.arch@bytedance.com> wrote:
> 
>>>
>>> Acked-by: Yu Zhao <yuzhao@google.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

> 


  reply	other threads:[~2024-12-16  6:15 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-12-14  9:02 [PATCH 00/12] move pagetable_*_dtor() to __tlb_remove_table() Qi Zheng
2024-12-14  9:02 ` [PATCH 01/12] Revert "mm: pgtable: make ptlock be freed by RCU" Qi Zheng
2024-12-14 18:29   ` Yu Zhao
2024-12-15  6:29     ` Qi Zheng
2024-12-16  6:10       ` Andrew Morton
2024-12-16  6:15         ` Qi Zheng [this message]
2024-12-16  6:35           ` Andrew Morton
2024-12-16  6:39             ` Qi Zheng
2024-12-14  9:02 ` [PATCH 02/12] mm: pgtable: introduce generic p4d_alloc_one() and p4d_free() Qi Zheng
2024-12-18 14:26   ` Klara Modin
2024-12-18 14:42     ` Qi Zheng
2024-12-14  9:02 ` [PATCH 03/12] arm64: pgtable: use mmu gather to free p4d level page table Qi Zheng
2024-12-14  9:02 ` [PATCH 04/12] s390: pgtable: add statistics for PUD and P4D " Qi Zheng
2024-12-14  9:02 ` [PATCH 05/12] mm: pgtable: introduce pagetable_dtor() Qi Zheng
2024-12-14  9:02 ` [PATCH 06/12] arm: pgtable: move pagetable_dtor() to __tlb_remove_table() Qi Zheng
2024-12-14  9:02 ` [PATCH 07/12] arm64: " Qi Zheng
2024-12-14  9:02 ` [PATCH 08/12] riscv: " Qi Zheng
2024-12-14  9:02 ` [PATCH 09/12] x86: " Qi Zheng
2024-12-14  9:02 ` [PATCH 10/12] s390: pgtable: also move pagetable_dtor() of PxD " Qi Zheng
2024-12-14  9:02 ` [PATCH 11/12] mm: pgtable: introduce generic __tlb_remove_table() Qi Zheng
2024-12-16 12:00   ` Peter Zijlstra
2024-12-16 12:03     ` Peter Zijlstra
2024-12-16 12:05       ` Peter Zijlstra
2024-12-16 13:53         ` Qi Zheng
2024-12-16 12:52     ` Qi Zheng
2024-12-16 18:12       ` Peter Zijlstra
2024-12-17  3:42         ` Qi Zheng
2024-12-17  9:02           ` Peter Zijlstra
2024-12-17  9:10             ` Qi Zheng
2024-12-14  9:02 ` [PATCH 12/12] mm: pgtable: move __tlb_remove_table_one() in x86 to generic file Qi Zheng
2024-12-14 18:55 ` [PATCH 00/12] move pagetable_*_dtor() to __tlb_remove_table() Peter Zijlstra
2024-12-15  6:23   ` Qi Zheng

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