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

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Message-ID: <20250526162940.GB4156@redhat.com>
Date: Mon, 26 May 2025 18:29:41 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: David Hildenbrand <david@...hat.com>
Cc: Pu Lehui <pulehui@...weicloud.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, mhiramat@...nel.org,
	peterz@...radead.org, akpm@...ux-foundation.org,
	Liam.Howlett@...cle.com, vbabka@...e.cz, jannh@...gle.com,
	pfalcato@...e.de, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	pulehui@...wei.com, Andrii Nakryiko <andrii@...nel.org>,
	Jiri Olsa <jolsa@...nel.org>
Subject: Re: [RFC PATCH] mm/mmap: Fix uprobe anon page be overwritten when
 expanding vma during mremap

On 05/25, David Hildenbrand wrote:
>
> On 25.05.25 11:59, Oleg Nesterov wrote:
> >
> >OK. But do you see any reason why uprobe_mmap() should be ever called during
> >mremap() ?
>
> Only when growing a VMA: we might now cover a part with a uprobe, which we
> have take care of.

Ah, indeed, thank you...

But. What if mremap() expands and moves a VMA? it seems to me that in
this case uprobe_mmap() won't be called? I'll try to make the test-case
to check...

Oleg.