linux-kernel - Re: [systemd-devel] [PATCH 2/2] coredump: Handle programs with spaces in COMM

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Date:	Wed, 1 May 2013 18:42:46 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Colin Walters <walters@...bum.org>
Cc:	Zbigniew Jędrzejewski-Szmek <zbyszek@...waw.pl>,
	systemd-devel@...ts.freedesktop.org,
	Denys Vlasenko <vda.linux@...glemail.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [systemd-devel] [PATCH 2/2] coredump: Handle programs with
	spaces in COMM

On 04/30, Colin Walters wrote:
>
> On Tue, 2013-04-30 at 19:47 +0200, Zbigniew Jędrzejewski-Szmek wrote:
> > On Tue, Apr 30, 2013 at 01:12:19PM -0400, Colin Walters wrote:
> > > This patch makes systemd-coredump handle processes that have
> > > whitespace in their COMM fields.
> > >
> > > fs/coredump.c when given %e (as systemd-coredump uses), will end up
> > > joining the process arguments into a string (along with the other
> > > fields), then will split the entire thing up on whitespace, and use
> > > it as the arguments to the coredump pipe handler.
> > > ---
> > That's a workaround for a bug in the kernel. I think it makes sense, but
> > it'd be nice to fix the kernel too.

I wouldn't say this is bug... at least this is expected.

Sure, it is possible to rewrite format_corename/argv_split interaction,
but this is a bit painful and I am not sure it worth the trouble.

> To do what though?  Add a new coredump format specifier that gives you
> a string-escaped version as one argument?  That'd probably make sense,

Or, perhaps, we can simply change cn_escape() to do s/space/something/
unconditionally (currently it only does s'/'!'). But this is a user-
visible change.

Oleg.

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