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

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Message-ID: <20070220125626.GC27551@lnx-holt.americas.sgi.com>
Date:	Tue, 20 Feb 2007 06:56:26 -0600
From:	Robin Holt <holt@....com>
To:	David Howells <dhowells@...hat.com>
Cc:	"Kawai, Hidehiro" <hidehiro.kawai.ez@...achi.com>,
	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

On Tue, Feb 20, 2007 at 10:58:17AM +0000, David Howells wrote:
> Kawai, Hidehiro <hidehiro.kawai.ez@...achi.com> wrote:
> Actually, I don't think the locking is that hard or that complex.
> 
> 	int do_coredump(long signr, int exit_code, struct pt_regs * regs)
> 	{
> 		<setup vars>
> 
> 		down_read(&coredump_settings_sem);
> 
> 		...
> 
> 	fail:
> 		up_read(&coredump_settings_sem);
> 		return retval;
> 	}
> 
> And:
> 
> 	static ssize_t proc_coredump_omit_anon_shared_write(struct file *file,
> 						    const char __user *buf,
> 						    size_t count,
> 						    loff_t *ppos)
> 	{
> 		<setup vars>
> 
> 		down_write(&coredump_settings_sem);

If the dump has started, do we want to change this to a trylock and skip
changing the value if it is already locked?

Thanks,
Robin
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