From: Edward Napierala <trasz@freebsd.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Michal Hocko <mhocko@kernel.org>,
linux-api@vger.kernel.org, Khalid Aziz <khalid.aziz@oracle.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Russell King - ARM Linux <linux@armlinux.org.uk>,
Andrea Arcangeli <aarcange@redhat.com>,
linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>,
linux-arch@vger.kernel.org, Florian Weimer <fweimer@redhat.com>,
John Hubbard <jhubbard@nvidia.com>,
Matthew Wilcox <willy@infradead.org>,
Abdul Haleem <abdhalee@linux.vnet.ibm.com>,
Joel Stanley <joel@jms.id.au>, Kees Cook <keescook@chromium.org>,
Michal Hocko <mhocko@suse.com>,
jasone@google.com, davidtgoldblatt@gmail.com
Subject: Re: [PATCH v2 0/2] mm: introduce MAP_FIXED_SAFE
Date: Thu, 14 Dec 2017 12:44:17 +0000 [thread overview]
Message-ID: <CAFLM3-oANXKEU=tuurSJx9rdzfWGfym-0FUEWnfBq8mOaVMzOA@mail.gmail.com> (raw)
In-Reply-To: <20171213163210.6a16ccf8753b74a6982ef5b6@linux-foundation.org>
[-- Attachment #1: Type: text/plain, Size: 827 bytes --]
Regarding the name - how about adopting MAP_EXCL? It was introduced in
FreeBSD,
and seems to do exactly this; quoting mmap(2):
MAP_FIXED Do not permit the system to select a different address
than the one specified. If the specified address
cannot be used, mmap() will fail. If MAP_FIXED is
specified, addr must be a multiple of the page size.
If MAP_EXCL is not specified, a successful MAP_FIXED
request replaces any previous mappings for the
process' pages in the range from addr to addr + len.
In contrast, if MAP_EXCL is specified, the request
will fail if a mapping already exists within the
range.
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next prev parent reply other threads:[~2017-12-14 12:44 UTC|newest]
Thread overview: 114+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-13 9:25 [PATCH v2 0/2] mm: introduce MAP_FIXED_SAFE Michal Hocko
2017-12-13 9:25 ` Michal Hocko
2017-12-13 9:25 ` Michal Hocko
2017-12-13 9:25 ` [PATCH 1/2] " Michal Hocko
2017-12-13 9:25 ` Michal Hocko
2017-12-13 9:25 ` Michal Hocko
2017-12-13 12:50 ` Matthew Wilcox
2017-12-13 12:50 ` Matthew Wilcox
2017-12-13 12:50 ` Matthew Wilcox
2017-12-13 13:01 ` Michal Hocko
2017-12-13 13:01 ` Michal Hocko
2017-12-13 9:25 ` [PATCH 2/2] fs, elf: drop MAP_FIXED usage from elf_map Michal Hocko
2017-12-13 9:25 ` Michal Hocko
2017-12-13 9:25 ` Michal Hocko
2017-12-16 0:49 ` [2/2] " Andrei Vagin
2017-12-18 9:13 ` Michal Hocko
2017-12-18 9:13 ` Michal Hocko
2017-12-18 18:12 ` Andrei Vagin
2017-12-18 18:12 ` Andrei Vagin
2017-12-18 18:49 ` [PATCH] mm: don't use the same value for MAP_FIXED_SAFE and MAP_SYNC Andrei Vagin
2017-12-18 18:49 ` Andrei Vagin
2017-12-18 20:41 ` Michal Hocko
2017-12-18 20:41 ` Michal Hocko
2018-04-18 10:51 ` [PATCH 2/2] fs, elf: drop MAP_FIXED usage from elf_map Tetsuo Handa
2018-04-18 10:51 ` Tetsuo Handa
2018-04-18 11:33 ` Michal Hocko
2018-04-18 11:43 ` Tetsuo Handa
2018-04-18 11:55 ` Michal Hocko
2018-04-18 14:07 ` [PATCH v2] fs, elf: don't complain MAP_FIXED_NOREPLACE unless -EEXIST error Tetsuo Handa
2018-04-19 5:57 ` Michal Hocko
2017-12-13 9:31 ` [PATCH 1/2] mmap.2: document new MAP_FIXED_SAFE flag Michal Hocko
2017-12-13 9:31 ` Michal Hocko
2017-12-13 9:31 ` Michal Hocko
2017-12-13 9:31 ` [PATCH 2/2] mmap.2: MAP_FIXED updated documentation Michal Hocko
2017-12-13 9:31 ` Michal Hocko
2017-12-13 9:31 ` Michal Hocko
2017-12-13 12:55 ` Pavel Machek
2017-12-13 13:03 ` Cyril Hrubis
2017-12-13 13:03 ` Cyril Hrubis
2017-12-13 13:03 ` Cyril Hrubis
2017-12-13 13:04 ` Michal Hocko
2017-12-13 13:04 ` Michal Hocko
2017-12-13 13:09 ` Pavel Machek
2017-12-13 13:16 ` Michal Hocko
2017-12-13 13:16 ` Michal Hocko
2017-12-13 13:21 ` Pavel Machek
2017-12-13 13:21 ` Pavel Machek
2017-12-13 13:35 ` Michal Hocko
2017-12-13 13:35 ` Michal Hocko
2017-12-13 14:40 ` Cyril Hrubis
2017-12-13 14:40 ` Cyril Hrubis
2017-12-13 14:40 ` Cyril Hrubis
2017-12-13 23:19 ` Kees Cook
2017-12-13 23:19 ` Kees Cook
2017-12-14 7:07 ` Michal Hocko
2017-12-14 7:07 ` Michal Hocko
2017-12-14 7:07 ` Michal Hocko
2017-12-18 19:12 ` Michael Kerrisk (man-pages)
2017-12-18 19:12 ` Michael Kerrisk (man-pages)
2017-12-18 20:19 ` Kees Cook
2017-12-18 20:19 ` Kees Cook
2017-12-18 20:33 ` Matthew Wilcox
2017-12-18 20:33 ` Matthew Wilcox
2017-12-21 12:38 ` Michael Ellerman
2017-12-21 12:38 ` Michael Ellerman
2017-12-21 12:38 ` Michael Ellerman
2017-12-21 12:38 ` Michael Ellerman
2017-12-21 14:59 ` known bad patch in -mm tree was " Pavel Machek
2017-12-21 15:08 ` Michal Hocko
2017-12-21 15:08 ` Michal Hocko
2017-12-21 22:24 ` Andrew Morton
2017-12-21 22:24 ` Andrew Morton
2017-12-21 22:24 ` Andrew Morton
2017-12-22 0:06 ` Michael Ellerman
2017-12-22 0:06 ` Michael Ellerman
2017-12-22 0:06 ` Michael Ellerman
2017-12-14 2:52 ` Jann Horn
2017-12-14 2:52 ` Jann Horn
2017-12-14 5:28 ` John Hubbard
2017-12-14 5:28 ` John Hubbard
2017-12-14 5:28 ` John Hubbard
2017-12-14 5:28 ` John Hubbard
2017-12-14 23:06 ` John Hubbard
2017-12-14 23:06 ` John Hubbard
2017-12-14 23:06 ` John Hubbard
2017-12-14 23:10 ` Jann Horn
2017-12-14 23:10 ` Jann Horn
2017-12-14 23:10 ` Jann Horn
2017-12-13 12:25 ` [PATCH v2 0/2] mm: introduce MAP_FIXED_SAFE Matthew Wilcox
2017-12-13 12:25 ` Matthew Wilcox
2017-12-13 12:25 ` Matthew Wilcox
2017-12-13 12:34 ` Michal Hocko
2017-12-13 12:34 ` Michal Hocko
2017-12-13 17:13 ` Kees Cook
2017-12-13 17:13 ` Kees Cook
2017-12-13 17:13 ` Kees Cook
2017-12-15 9:02 ` Michael Ellerman
2017-12-15 9:02 ` Michael Ellerman
2017-12-14 0:32 ` Andrew Morton
2017-12-14 0:32 ` Andrew Morton
2017-12-14 0:32 ` Andrew Morton
2017-12-14 0:32 ` Andrew Morton
2017-12-14 1:35 ` David Goldblatt
2017-12-14 1:42 ` David Goldblatt
2017-12-14 1:42 ` David Goldblatt
2017-12-14 12:44 ` Edward Napierala [this message]
2017-12-14 13:15 ` Michal Hocko
2017-12-14 13:15 ` Michal Hocko
2017-12-14 14:54 ` Edward Napierala
2017-12-14 14:54 ` Edward Napierala
2017-12-19 12:40 ` David Laight
2017-12-19 12:40 ` David Laight
2017-12-19 12:46 ` Michal Hocko
2017-12-19 12:46 ` Michal Hocko
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