From: Alexey Gladkov <legion@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
"Eric W . Biederman" <ebiederm@xmission.com>,
Andrew Morton <akpm@linux-foundation.org>,
Christian Brauner <brauner@kernel.org>,
Iurii Zaikin <yzaikin@google.com>,
Kees Cook <keescook@chromium.org>,
Linux Containers <containers@lists.linux.dev>,
linux-fsdevel <linux-fsdevel@vger.kernel.org>,
Luis Chamberlain <mcgrof@kernel.org>,
Vasily Averin <vvs@virtuozzo.com>
Subject: Re: [RFC PATCH 2/4] sysctl: ipc: Do not use dynamic memory
Date: Wed, 1 Jun 2022 21:05:17 +0200 [thread overview]
Message-ID: <Ype4bRsuT6zBzPrA@example.org> (raw)
In-Reply-To: <CAHk-=wgBeQafNgw6DNUwM4vvw4snb83Tb65m_QH9XSic2JSJaQ@mail.gmail.com>
On Wed, Jun 01, 2022 at 11:34:18AM -0700, Linus Torvalds wrote:
> On Wed, Jun 1, 2022 at 11:25 AM Alexey Gladkov <legion@kernel.org> wrote:
> >
> > I'm not sure how to get rid of ctl_table since net sysctls are heavily
> > dependent on it.
>
> I don't actually think it's worth getting rid of entirely, because
> there's just a lot of simple cases where it "JustWorks(tm)" and having
> just that table entry describe all the semantics is not wrong at all.
>
> The name may suck, but hey, it's not a big deal. Changing it now would
> be more pain than it's worth.
>
> No, I was more thinking that things that already need more
> infrastructure than that simple static ctl_table entry might be better
> off trying to migrate to your new "proper read op" model, and having
> more of that dynamic behavior in the read op.
This was part of my plan. I wanted to step by step try migrating other
sysctls to use open/read/write where it makes sense.
To be honest, it was Eric Biederman who came up with the idea to separate
open, read and write. I am very grateful to him.
> The whole "create dynamic ctl_table entries on the fly" model works,
> but it's kind of ugly.
>
> Anyway, I think all of this is "I think there is more room for cleanup
> in this area", and maybe we'll never have enough motivation to
> actually do that.
>
> Your patches seem to fix the extant issue with the ipc namespace, and
> the truly disgusting parts (although maybe there are other truly
> disgusting things hiding - I didn't go look for them).
I also hope to try and fix the f_cred issue.
--
Rgrds, legion
next prev parent reply other threads:[~2022-06-01 19:30 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-14 18:18 [PATCH v4 0/2] ipc: Store mq and ipc sysctls in the ipc namespace Alexey Gladkov
2022-02-14 18:18 ` [PATCH v4 1/2] ipc: Store mqueue " Alexey Gladkov
2022-02-14 18:18 ` [PATCH v4 2/2] ipc: Store ipc " Alexey Gladkov
2022-03-23 20:24 ` [GIT PULL] ipc: Bind to the ipc namespace at open time Eric W. Biederman
2022-03-24 18:12 ` Linus Torvalds
2022-03-24 21:48 ` Eric W. Biederman
2022-03-24 22:16 ` Linus Torvalds
2022-03-25 12:10 ` Alexey Gladkov
2022-04-22 12:53 ` [PATCH v1 0/4] ipc: Remove extra1 field abuse to pass ipc namespace Alexey Gladkov
2022-04-22 12:53 ` [PATCH v1 1/4] " Alexey Gladkov
2022-05-02 16:07 ` Eric W. Biederman
2022-04-22 12:53 ` [PATCH v1 2/4] ipc: Use proper " Alexey Gladkov
2022-05-02 16:09 ` Eric W. Biederman
2022-05-03 13:39 ` Alexey Gladkov
2022-05-03 13:39 ` [PATCH v2 1/4] ipc: Use the same namespace to modify and validate Alexey Gladkov
2022-05-03 13:39 ` [PATCH v2 2/4] ipc: Remove extra1 field abuse to pass ipc namespace Alexey Gladkov
2022-05-03 13:39 ` [PATCH v2 3/4] ipc: Check permissions for checkpoint_restart sysctls at open time Alexey Gladkov
2022-05-03 13:39 ` [PATCH v2 4/4] ipc: Remove extra braces Alexey Gladkov
2022-04-22 12:53 ` [PATCH v1 3/4] ipc: Check permissions for checkpoint_restart sysctls at open time Alexey Gladkov
2022-04-22 12:53 ` [PATCH v1 4/4] ipc: Remove extra braces Alexey Gladkov
2022-04-22 20:44 ` [PATCH v1 0/4] ipc: Remove extra1 field abuse to pass ipc namespace Linus Torvalds
2022-05-04 3:42 ` Philip Rhoades
2022-06-01 13:20 ` [RFC PATCH 0/4] API extension for handling sysctl Alexey Gladkov
2022-06-01 13:20 ` [RFC PATCH 1/4] sysctl: " Alexey Gladkov
2022-06-01 19:19 ` Matthew Wilcox
2022-06-01 19:23 ` Linus Torvalds
2022-06-01 19:25 ` Matthew Wilcox
2022-06-01 19:31 ` Linus Torvalds
2022-06-01 19:32 ` Alexey Gladkov
2022-06-01 13:20 ` [RFC PATCH 2/4] sysctl: ipc: Do not use dynamic memory Alexey Gladkov
2022-06-01 16:45 ` Linus Torvalds
2022-06-01 18:24 ` Alexey Gladkov
2022-06-01 18:34 ` Linus Torvalds
2022-06-01 19:05 ` Alexey Gladkov [this message]
2022-06-09 18:51 ` Luis Chamberlain
2022-06-01 13:20 ` [RFC PATCH 3/4] sysctl: userns: " Alexey Gladkov
2022-06-01 13:20 ` [RFC PATCH 4/4] sysctl: mqueue: " Alexey Gladkov
2022-06-09 16:45 ` [RFC PATCH 0/4] API extension for handling sysctl Luis Chamberlain
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