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From: Willy Tarreau <w@1wt.eu>
To: Jeff Layton <jlayton@kernel.org>
Cc: "Rodrigo Campos" <rodrigo@kinvolk.io>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	"Matthew Wilcox" <willy@infradead.org>,
	"Andy Lutomirski" <luto@kernel.org>,
	"Linus Torvalds" <torvalds@linux-foundation.org>,
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Subject: Re: Removing Mandatory Locks
Date: Thu, 19 Aug 2021 22:03:23 +0200	[thread overview]
Message-ID: <20210819200323.GA13017@1wt.eu> (raw)
In-Reply-To: <8ba92aa3e97bfc3df89cd64fffcbc91b640530f1.camel@kernel.org>

On Thu, Aug 19, 2021 at 03:18:15PM -0400, Jeff Layton wrote:
> On Wed, 2021-08-18 at 11:34 +0200, Rodrigo Campos wrote:
> > On Tue, Aug 17, 2021 at 6:49 PM Eric W. Biederman <ebiederm@xmission.com> wrote:
> > > 
> > > Matthew Wilcox <willy@infradead.org> writes:
> > > 
> > > > On Fri, Aug 13, 2021 at 05:49:19PM -0700, Andy Lutomirski wrote:
> > > > > [0] we have mandatory locks, too. Sigh.
> > > > 
> > > > I'd love to remove that.  Perhaps we could try persuading more of the
> > > > distros to disable the CONFIG option first.
> > > 
> > > Yes.  The support is disabled in RHEL8.
> > 
> > If it helps, it seems to be enabled on the just released debian stable:
> >     $ grep CONFIG_MANDATORY_FILE_LOCKING /boot/config-5.10.0-8-amd64
> >     CONFIG_MANDATORY_FILE_LOCKING=y
> > 
> > Also the new 5.13 kernel in experimental has it too:
> >     $ grep CONFIG_MANDATORY_FILE_LOCKING /boot/config-5.13.0-trunk-amd64
> >     CONFIG_MANDATORY_FILE_LOCKING=y
> 
> A pity. It would have been nice if they had turned it off a while ago. I
> guess I should have done more outreach at the time. Sigh...

Would it be acceptable to add a warning when MS_MANDLOCK is passed to
mount() and backport this to stable kernels in order to get reports
of any such use in a reasonably short time ? Anyway it sounds
important to at least warn about deprecation.

Willy

  reply	other threads:[~2021-08-19 20:06 UTC|newest]

Thread overview: 86+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-12  8:43 [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE David Hildenbrand
2021-08-12  8:43 ` [PATCH v1 1/7] binfmt: don't use MAP_DENYWRITE when loading shared libraries via uselib() David Hildenbrand
2021-08-12  8:43 ` [PATCH v1 2/7] kernel/fork: factor out atomcially replacing the current MM exe_file David Hildenbrand
2021-08-12  9:17   ` Christian Brauner
2021-08-12  8:43 ` [PATCH v1 3/7] kernel/fork: always deny write access to " David Hildenbrand
2021-08-12 10:05   ` Christian Brauner
2021-08-12 10:13     ` David Hildenbrand
2021-08-12 12:32       ` Christian Brauner
2021-08-12 12:38         ` David Hildenbrand
2021-08-12 16:51   ` Linus Torvalds
2021-08-12 19:38     ` David Hildenbrand
2021-08-12  8:43 ` [PATCH v1 4/7] binfmt: remove in-tree usage of MAP_DENYWRITE David Hildenbrand
2021-08-12  8:43 ` [PATCH v1 5/7] mm: remove VM_DENYWRITE David Hildenbrand
2021-08-12  8:43 ` [PATCH v1 6/7] mm: ignore MAP_DENYWRITE in ksys_mmap_pgoff() David Hildenbrand
2021-08-12  8:43 ` [PATCH v1 7/7] fs: update documentation of get_write_access() and friends David Hildenbrand
2021-08-12 12:20 ` [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE Florian Weimer
2021-08-12 12:47   ` David Hildenbrand
2021-08-12 16:17   ` Eric W. Biederman
2021-08-12 17:32 ` Eric W. Biederman
2021-08-12 17:35   ` Andy Lutomirski
2021-08-12 17:48     ` Eric W. Biederman
2021-08-12 18:01       ` Andy Lutomirski
2021-08-12 18:10       ` Linus Torvalds
2021-08-12 18:47         ` Eric W. Biederman
2021-08-13  9:05           ` David Laight
2021-08-13 20:17             ` Eric W. Biederman
2021-08-13 20:51               ` Florian Weimer
2021-08-14  0:31               ` Linus Torvalds
2021-08-14  0:49                 ` Andy Lutomirski
2021-08-14  0:54                   ` Linus Torvalds
2021-08-14  0:58                     ` Linus Torvalds
2021-08-14  1:57                       ` Al Viro
2021-08-14  2:02                         ` Al Viro
2021-08-14  9:06                           ` David Hildenbrand
2021-08-14  7:53                         ` Christian Brauner
2021-08-14 19:52                     ` David Laight
2021-08-26 17:48                     ` Andy Lutomirski
2021-08-26 21:47                       ` David Hildenbrand
2021-08-26 22:13                         ` Eric W. Biederman
2021-08-27  8:22                           ` David Laight
2021-08-27 15:58                             ` Eric W. Biederman
2021-09-01  8:28                           ` David Hildenbrand
2021-08-27 10:18                         ` Christian Brauner
2021-08-14  3:04                   ` Matthew Wilcox
2021-08-17 16:48                     ` Removing Mandatory Locks Eric W. Biederman
2021-08-17 16:50                       ` David Hildenbrand
2021-08-18  9:34                       ` Rodrigo Campos
2021-08-19 19:18                         ` Jeff Layton
2021-08-19 20:03                           ` Willy Tarreau [this message]
2021-08-19 18:39                       ` Jeff Layton
2021-08-19 19:15                         ` Linus Torvalds
2021-08-19 19:55                           ` Eric Biggers
2021-08-19 20:18                           ` Jeff Layton
2021-08-19 20:31                             ` Linus Torvalds
2021-08-19 21:43                               ` Jeff Layton
2021-08-19 22:32                                 ` Linus Torvalds
2021-08-20  8:30                                   ` David Laight
2021-08-23  7:55                                     ` Geert Uytterhoeven
2021-08-23  8:14                                       ` David Laight
2021-08-20 13:43                                   ` Steven Rostedt
2021-08-20 16:06                                     ` Linus Torvalds
2021-08-20  2:10                               ` Matthew Wilcox
2021-08-20  6:36                               ` Amir Goldstein
2021-08-20  7:14                                 ` Amir Goldstein
2021-08-20 12:27                                   ` Jeff Layton
2021-08-20 12:38                                     ` Willy Tarreau
2021-08-20 13:03                                       ` Jeff Layton
2021-08-20 13:11                                         ` Willy Tarreau
2021-08-20 16:30                           ` Kees Cook
2021-08-20 19:17                             ` H. Peter Anvin
2021-08-20 21:29                               ` Jeff Layton
2021-08-20 21:29                                 ` Jeff Layton
2021-08-21 12:45                                 ` Jeff Layton
2021-08-21 12:45                                   ` Jeff Layton
2021-08-23 22:15                                   ` J. Bruce Fields
2021-08-20 22:31                               ` Matthew Wilcox
2021-08-18  7:51                     ` [PATCH v1 0/7] Remove in-tree usage of MAP_DENYWRITE Christian Brauner
2021-08-18 15:42                   ` J. Bruce Fields
2021-08-19 13:56                     ` Eric W. Biederman
2021-08-19 14:33                       ` J. Bruce Fields
2021-08-20 12:54                         ` Jeff Layton
2021-08-20  3:44                     ` NeilBrown
2021-08-20  8:25                       ` David Laight
2021-08-12 19:24         ` David Hildenbrand
2021-08-12 18:15       ` Florian Weimer
2021-08-12 18:21         ` Linus Torvalds

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