From: Kees Cook <keescook@chromium.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Jeff Layton" <jlayton@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"Matthew Wilcox" <willy@infradead.org>,
"Andy Lutomirski" <luto@kernel.org>,
"David Laight" <David.Laight@aculab.com>,
"David Hildenbrand" <david@redhat.com>,
"Linux Kernel Mailing List" <linux-kernel@vger.kernel.org>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Ingo Molnar" <mingo@redhat.com>,
"Borislav Petkov" <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"Al Viro" <viro@zeniv.linux.org.uk>,
"Alexey Dobriyan" <adobriyan@gmail.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
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"Vincenzo Frascino" <vincenzo.frascino@arm.com>,
"Chinwen Chang" <chinwen.chang@mediatek.com>,
"Michel Lespinasse" <walken@google.com>,
"Catalin Marinas" <catalin.marinas@arm.com>,
"Huang Ying" <ying.huang@intel.com>,
"Jann Horn" <jannh@google.com>, "Feng Tang" <feng.tang@intel.com>,
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"Michael Ellerman" <mpe@ellerman.id.au>,
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"Christian Brauner" <christian.brauner@ubuntu.com>,
"Jens Axboe" <axboe@kernel.dk>,
"Gabriel Krisman Bertazi" <krisman@collabora.com>,
"Peter Xu" <peterx@redhat.com>,
"Suren Baghdasaryan" <surenb@google.com>,
"Shakeel Butt" <shakeelb@google.com>,
"Marco Elver" <elver@google.com>,
"Daniel Jordan" <daniel.m.jordan@oracle.com>,
"Nicolas Viennot" <Nicolas.Viennot@twosigma.com>,
"Thomas Cedeno" <thomascedeno@google.com>,
"Collin Fijalkovich" <cfijalkovich@google.com>,
"Michal Hocko" <mhocko@suse.com>,
"Miklos Szeredi" <miklos@szeredi.hu>,
"Chengguang Xu" <cgxu519@mykernel.net>,
"Christian König" <ckoenig.leichtzumerken@gmail.com>,
"linux-unionfs@vger.kernel.org" <linux-unionfs@vger.kernel.org>,
"Linux API" <linux-api@vger.kernel.org>,
"the arch/x86 maintainers" <x86@kernel.org>,
"<linux-fsdevel@vger.kernel.org>" <linux-fsdevel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
"Florian Weimer" <fweimer@redhat.com>,
"Michael Kerrisk" <mtk.manpages@gmail.com>
Subject: Re: Removing Mandatory Locks
Date: Fri, 20 Aug 2021 09:30:31 -0700 [thread overview]
Message-ID: <202108200905.BE8AF7C@keescook> (raw)
In-Reply-To: <CAHk-=wgewmbABDC3_ZNn11C+sm4Uz0L9HZ5Kvx0Joho4vsV4DQ@mail.gmail.com>
On Thu, Aug 19, 2021 at 12:15:08PM -0700, Linus Torvalds wrote:
> On Thu, Aug 19, 2021 at 11:39 AM Jeff Layton <jlayton@kernel.org> wrote:
> >
> > I'm all for ripping it out too. It's an insane interface anyway.
> >
> > I've not heard a single complaint about this being turned off in
> > fedora/rhel or any other distro that has this disabled.
>
> I'd love to remove it, we could absolutely test it. The fact that
> several major distros have it disabled makes me think it's fine.
FWIW, it is now disabled in Ubuntu too:
https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/impish/commit/?h=master-next&id=f3aac5e47789cbeb3177a14d3d2a06575249e14b
> But as always, it would be good to check Android.
It looks like it's enabled (checking the Pixel 4 kernel image), but it's
not specifically mentioned in any of the build configs that are used to
construct the image, so I think this is just catching the "default y". I
expect it'd be fine to turn this off.
I will ask around to see if it's actually used.
--
Kees Cook
next prev parent reply other threads:[~2021-08-20 16:30 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
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 [this message]
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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