linux-kernel - Re: [PATCH 3/4] coredump: ELF-FDPIC: enable to omit anonymous shared memory

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Date:	Wed, 21 Feb 2007 11:33:31 +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 3/4] coredump: ELF-FDPIC: enable to omit anonymous shared memory 

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

> Is coredump_setting_sem a global semaphore?  If so, it prevents concurrent
> core dumping.

No, it doesn't.  Look again:

	int do_coredump(long signr, int exit_code, struct pt_regs * regs)
	{
		<setup vars>

 >>>>		down_read(&coredump_settings_sem);

> Additionally, while some process is dumped, writing to
> coredump_omit_anon_shared of unrelated process will be blocked.

Yes, but that's probably reasonable.  How likely (a) is a process to coredump,
and (b) is a coredump to occur simultaneously with someone altering their
settings?

David
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