linux-kernel - Re: [PATCH] binfmt_elf: core dump masking support

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Message-ID: <20070109143912.GC19787@elf.ucw.cz>
Date:	Tue, 9 Jan 2007 15:39:12 +0100
From:	Pavel Machek <pavel@....cz>
To:	"Kawai, Hidehiro" <hidehiro.kawai.ez@...achi.com>
Cc:	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org,
	gregkh@...e.de, james.bottomley@...eleye.com,
	Satoshi OSHIMA <soshima@...hat.com>,
	"Hideo AOKI@...hat" <haoki@...hat.com>,
	sugita <yumiko.sugita.yf@...achi.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [PATCH] binfmt_elf: core dump masking support

Hi!

> > > When a new process is created, the process inherits the coremask
> > > setting from its parent. It is useful to set the coremask before
> > > the program runs. For example:
> > > 
> > >   $ echo 1 > /proc/self/coremask
> > >   $ ./some_program
> >
> > User can already ulimit -c 0 on himself, perhaps we want to use same
> > interface here? ulimit -cmask=(bitmask)?
> 
> Are you saying that 1) it is good to change ulimit (shell programs)
> so that shell programs will read/write /proc/self/coremask when
> the -cmask option is given to ulimit?
> Or, 2) it is good to change ulimit and get/setrlimit so that shell
> programs will invoke get/setrlimit with new parameter?

I'm trying to say 2).

> If the changes are acceptable to bash or other shell community, I think
> the first approach is nice.
> But the second approach is problematic because the bitmask doesn't
> conform to the usage of setrlimit.  You know, setrlimit controls amount
> of resources the system can use by the soft limit and hard limit.
> These limitations don't suit for the bitmask.

Well, you can have it as set of 0-1 "limits"...
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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