linux-kernel - Re: [PATCH 0/4] coredump: core dump masking support v3

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Message-ID: <20425.1171638534@redhat.com>
Date:	Fri, 16 Feb 2007 15:08:54 +0000
From:	David Howells <dhowells@...hat.com>
To:	"Kawai, Hidehiro" <hidehiro.kawai.ez@...achi.com>
Cc:	Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>, Robin Holt <holt@....com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <soshima@...hat.com>,
	"Hideo AOKI@...hat" <haoki@...hat.com>
Subject: Re: [PATCH 0/4] coredump: core dump masking support v3 

Kawai, Hidehiro <hidehiro.kawai.ez@...achi.com> wrote:

> To avoid the above situation we can limit the core file size by
> setrlimit(2) or ulimit(1). But this method can lose important data
> such as stack because core dumping is terminated halfway.
> So I suggest keeping shared memory segments from being dumped for
> particular processes.

A better way might be to place the shared memory segments last if that's
possible (I'm not sure ELF supports out-of-order segments).

> Because the shared memory attached to processes is common in them, we don't
> need to dump the shared memory every time.

So there's no guarantee that they'll be dumped at all...  I'm not sure there's
any way around that, however.

David
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