linux-kernel - Re: [PATCH] munmap sealed memory cause memory to split (bug)

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Message-ID: <06a5922f-ba94-4387-901b-c4f1fb154950@lucifer.local>
Date: Thu, 17 Oct 2024 20:16:06 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Pedro Falcato <pedro.falcato@...il.com>
Cc: Jeff Xu <jeffxu@...omium.org>, akpm@...ux-foundation.org,
        keescook@...omium.org, torvalds@...ux-foundation.org,
        usama.anjum@...labora.com, corbet@....net, Liam.Howlett@...cle.com,
        jeffxu@...gle.com, jorgelo@...omium.org, groeck@...omium.org,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-mm@...ck.org, jannh@...gle.com, sroettger@...gle.com,
        linux-hardening@...r.kernel.org, willy@...radead.org,
        gregkh@...uxfoundation.org, deraadt@...nbsd.org, surenb@...gle.com,
        merimus@...gle.com, rdunlap@...radead.org
Subject: Re: [PATCH] munmap sealed memory cause memory to split (bug)

On Thu, Oct 17, 2024 at 08:14:11PM +0100, Pedro Falcato wrote:
> On Thu, Oct 17, 2024 at 09:20:20AM -0700, Jeff Xu wrote:
> > On Thu, Oct 17, 2024 at 1:18 AM Lorenzo Stoakes
> > <lorenzo.stoakes@...cle.com> wrote:
> > >
> > > NACK. Greg's bot got to it but...
> > >
> > > As per Greg's bot, no signed-off-by line.
> > >
> > Sorry for confusion, I wasn't meant to send this as a PATCH, but
> > reporting the issue.
> > The diff was just sent as reference to repro the bug, and I forgot to
> > remove PATCH from the title. I apologize for the confusion.
> >
>
> Can you explain what the issue is? I don't get it.
>
> --
> Pedro

I'll let Jeff explain from his perspective, but 99% the issue is as
described in [0], i.e. not a bug.

[0]:https://lore.kernel.org/linux-mm/e359abef-316f-4fca-8d1d-84b69c8bc060@lucifer.local/