linux-hardening - Re: [PATCH v3 00/11] sysctl: treewide: constify ctl

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Date: Wed, 8 May 2024 10:11:35 -0700
From: Kees Cook <keescook@...omium.org>
To: Jakub Kicinski <kuba@...nel.org>
Cc: Thomas Weißschuh <linux@...ssschuh.net>,
	Luis Chamberlain <mcgrof@...nel.org>,
	Joel Granados <j.granados@...sung.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Dave Chinner <david@...morbit.com>, linux-fsdevel@...r.kernel.org,
	netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-mm@...ck.org,
	linux-security-module@...r.kernel.org, bpf@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-xfs@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
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	coreteam@...filter.org, kexec@...ts.infradead.org,
	linux-hardening@...r.kernel.org, bridge@...ts.linux.dev,
	lvs-devel@...r.kernel.org, linux-rdma@...r.kernel.org,
	rds-devel@....oracle.com, linux-sctp@...r.kernel.org,
	linux-nfs@...r.kernel.org, apparmor@...ts.ubuntu.com
Subject: Re: [PATCH v3 00/11] sysctl: treewide: constify ctl_table argument
 of sysctl handlers

On Wed, Apr 24, 2024 at 08:12:34PM -0700, Jakub Kicinski wrote:
> On Tue, 23 Apr 2024 09:54:35 +0200 Thomas Weißschuh wrote:
> > The series was split from my larger series sysctl-const series [0].
> > It only focusses on the proc_handlers but is an important step to be
> > able to move all static definitions of ctl_table into .rodata.
> 
> Split this per subsystem, please.

I've done a few painful API transitions before, and I don't think the
complexity of these changes needs a per-subsystem constification pass. I
think this series is the right approach, but that patch 11 will need
coordination with Linus. We regularly do system-wide prototype changes
like this right at the end of the merge window before -rc1 comes out.

The requirements are pretty simple: it needs to be a obvious changes
(this certainly is) and as close to 100% mechanical as possible. I think
patch 11 easily qualifies. Linus should be able to run the same Coccinelle
script and get nearly the same results, etc. And all the other changes
need to have landed. This change also has no "silent failure" conditions:
anything mismatched will immediately stand out.

So, have patches 1-10 go via their respective subsystems, and once all
of those are in Linus's tree, send patch 11 as a stand-alone PR.

(From patch 11, it looks like the seccomp read/write function changes
could be split out? I'll do that now...)

-Kees

-- 
Kees Cook