linux-hardening - Re: [PATCH v1] selftest mm/mseal: fix test_seal_mremap_move_dontunmap

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Message-ID: <CABi2SkVX7nFwPDAQaYWn2Y33OnJRs8NJQv0oW-QJUcSYB8a6tQ@mail.gmail.com>
Date: Wed, 7 Aug 2024 14:34:36 -0700
From: Jeff Xu <jeffxu@...omium.org>
To: Pedro Falcato <pedro.falcato@...il.com>
Cc: Jeff Xu <jeffxu@...gle.com>, akpm@...ux-foundation.org, willy@...radead.org, 
	torvalds@...ux-foundation.org, Liam.Howlett@...cle.com, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-mm@...ck.org, dave.hansen@...el.com, linux-hardening@...r.kernel.org, 
	lorenzo.stoakes@...cle.com, mpe@...erman.id.au, oliver.sang@...el.com, 
	vbabka@...e.cz
Subject: Re: [PATCH v1] selftest mm/mseal: fix test_seal_mremap_move_dontunmap_anyaddr

On Wed, Aug 7, 2024 at 2:20 PM Pedro Falcato <pedro.falcato@...il.com> wrote:
>
> On Wed, Aug 7, 2024 at 7:03 PM Jeff Xu <jeffxu@...gle.com> wrote:
> > Do you have any suggestions here ? I can think of two options to choose from:
> >
> > 1> use 0xd0000000
> > 2> allocate a memory then free it, reuse the ptr.
>
> Personally I'd prefer 2, if you really want to keep the test. It's
> also a strategy used elsewhere (e.g mremap_dontunmap.c).
>
V2 is sent with 2.
Thanks for reporting this.

-Jeff