linux-kernel - Re: [PATCH] exec: Make do_coredump more robust and safer when using pipes in core

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Date:	Sun, 28 Jun 2009 13:52:35 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Neil Horman <nhorman@...driver.com>, linux-kernel@...r.kernel.org,
	earl_chew@...lent.com, Oleg Nesterov <oleg@...hat.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH] exec: Make do_coredump more robust and safer when using
 pipes in core_pattern

On Sun, 28 Jun 2009 21:31:12 +0200 Andi Kleen <andi@...stfloor.org> wrote:

> > One way would be to add a new sysctl-externs.h and then put all the
> > declarations in there.  That file gets included by sysctl.c and by each
> > file which shares a global with sysctl.c
> 
> Long ago I had a experimental patch to put sysctls into a new ELF section. The 
> you could simply put a DEFINE_SYSCTL(....) into the appropiate source file
> which defined the variable and most of the tables went.
> 
> No externs, no mess, no patch collisions, everything much nicer.
> 
> The only problem was that it didn't support the numerical sysctl
> space, so that would need to be removed first.
> 
> It's deprecated for quite some time now:
> 
>   if (msg_count < 5) {
>                 msg_count++;
>                 printk(KERN_INFO
>                         "warning: process `%s' used the deprecated sysctl "
>                         "system call with ", current->comm);
> 
> Should it finally go now? If yes I could polish up the old patch again.
> 

I suspect that it will be a long time before we can actually remove the
numerical sysctl support, if ever.  In _theory_ we should support it
for ever.  But in practice, we could probably remove it with a minimum
of disruption a few years hence, but it's hard to work this out.

When was the last time we saw a "warning: process `%s' used the
obsolete bdflush system call" warning?  A quick google here says 2004. 
Is that data?  A bit, I guess.

Maybe Eric has thought about this issue?
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