linux-kernel - Re: Sealed memfd & no-fault mmap

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Message-ID: <IGhZyUzuyCCNa4ps92NEd37xL_9W5DZnA9lyO9FGO5sxo5U2hxrgcPhQWY_HB0guIjYotTWILfa6VwXOz2SVY7bOf2rz89gpdNdXAxKeshA=@emersion.fr>
Date:   Thu, 03 Jun 2021 20:49:10 +0000
From:   Simon Ser <contact@...rsion.fr>
To:     Ming Lin <mlin@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Hugh Dickins <hughd@...gle.com>, Peter Xu <peterx@...hat.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Herrmann <dh.herrmann@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Greg Kroah-Hartman <greg@...ah.com>,
        "tytso@....edu" <tytso@....edu>
Subject: Re: Sealed memfd & no-fault mmap

On Thursday, June 3rd, 2021 at 10:07 PM, Ming Lin <mlin@...nel.org> 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.