linux-kernel - Re: [RFC PATCH v2 1/2] mm/mremap: Fix uprobe anon page be overwritten when expanding vma during mremap

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Message-ID: <fcb3b061-ca4b-44d7-a9fc-ecd0713c3fda@huaweicloud.com>
Date: Wed, 28 May 2025 00:32:57 +0800
From: Pu Lehui <pulehui@...weicloud.com>
To: Oleg Nesterov <oleg@...hat.com>
Cc: mhiramat@...nel.org, peterz@...radead.org, akpm@...ux-foundation.org,
 Liam.Howlett@...cle.com, lorenzo.stoakes@...cle.com, vbabka@...e.cz,
 jannh@...gle.com, pfalcato@...e.de, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, pulehui@...wei.com
Subject: Re: [RFC PATCH v2 1/2] mm/mremap: Fix uprobe anon page be overwritten
 when expanding vma during mremap


On 2025/5/27 22:23, Oleg Nesterov wrote:
> Well, I leave this to you / Lorenzo / David, but...
> 
> On 05/27, Pu Lehui wrote:
>>
>> Fixes: 78a320542e6c ("uprobes: Change valid_vma() to demand VM_MAYEXEC rather than VM_EXEC")
> 
> I don't think that commit could cause this problem.

Hi Oleg,

Me too! I was test that before and after commit 78a320542e6c, so call it 
the `directly related commit`. In fact, I think the issue was introduced 
in the original commit 2b1444983508 ("uprobes, mm, x86: Add the ability 
to install and remove uprobes breakpoints") # v3.5-rc1.

> 
> Oleg.