Re: Sealed memfd & no-fault mmap

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To: Ming Lin <mlin@xxxxxxxxxx>
Subject: Re: Sealed memfd & no-fault mmap
From: Simon Ser <contact@xxxxxxxxxxx>
Date: Thu, 03 Jun 2021 20:49:10 +0000
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Hugh Dickins <hughd@xxxxxxxxxx>, Peter Xu <peterx@xxxxxxxxxx>, "Kirill A. Shutemov" <kirill@xxxxxxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, Dan Williams <dan.j.williams@xxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Will Deacon <will@xxxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, David Herrmann <dh.herrmann@xxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, Greg Kroah-Hartman <greg@xxxxxxxxx>, "tytso@xxxxxxx" <tytso@xxxxxxx>
In-reply-to: <ca7afd0e-4fea-4601-6c06-36e0e3664945@kernel.org>
References: <vs1Us2sm4qmfvLOqNat0-r16GyfmWzqUzQ4KHbXJwEcjhzeoQ4sBTxx7QXDG9B6zk5AeT7FsNb3CSr94LaKy6Novh1fbbw8D_BBxYsbPLms=@emersion.fr> <CAHk-=whSGS=R8PtrfNcDTkCKOengEqygqeWjOZa2b8QkuOueDg@mail.gmail.com> <alpine.LSU.2.11.2105291315330.25425@eggly.anvils> <36fc2485-11f1-5252-904d-f26b63a6cd58@gmail.com> <e7454046-c071-888d-f673-276f9c24d9d3@gmail.com> <CAHk-=whce3vmj+g7jcE0rasoDavJutxno3ZZrvvWYQywWXH31Q@mail.gmail.com> <0464f8dd-d082-b246-83ff-609f0f48de59@gmail.com> <8By7yERxX_qlsLZuOeJihJqeU-pZtFxsS2zrQ1ssN6-NkyIRrv-r81Ux_PTcb8qy7QA1HmkRxTeixT5MaJs7NKk0rqxDC9Nu9DoTRmS0UHw=@emersion.fr> <ca7afd0e-4fea-4601-6c06-36e0e3664945@kernel.org>
Reply-to: Simon Ser <contact@xxxxxxxxxxx>

On Thursday, June 3rd, 2021 at 10:07 PM, Ming Lin <mlin@xxxxxxxxxx> wrote:

> In the new version of the patches, MAP_NOSIGBUS is not restricted to shmem.
> It can be used on ordinary files.

Oh, cool!

FWIW, if I had to choose between "MAP_NOSIGBUS not restricted to shm"
and "MAP_NOSIGBUS not restricted to MAP_PRIVATE", I'd probably choose
the latter. But of course the former is better than nothing at all.

References:
- Sealed memfd & no-fault mmap
  - From: Simon Ser
- Re: Sealed memfd & no-fault mmap
  - From: Linus Torvalds
- Re: Sealed memfd & no-fault mmap
  - From: Hugh Dickins
- Re: Sealed memfd & no-fault mmap
  - From: Ming Lin
- Re: Sealed memfd & no-fault mmap
  - From: Ming Lin
- Re: Sealed memfd & no-fault mmap
  - From: Linus Torvalds
- Re: Sealed memfd & no-fault mmap
  - From: Ming Lin
- Re: Sealed memfd & no-fault mmap
  - From: Simon Ser
- Re: Sealed memfd & no-fault mmap
  - From: Ming Lin

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