linux-kernel - Re: [PATCH 1/1] x86: Add process memory layout to coredump file

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Message-ID: <m2y5uknqjk.fsf@firstfloor.org>
Date:	Sat, 10 Dec 2011 12:02:39 -0800
From:	Andi Kleen <andi@...stfloor.org>
To:	t cheney <cdmalord@...il.com>
Cc:	linux-kernel@...r.kernel.org, viro@...iv.linux.org.uk,
	linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 1/1] x86: Add process memory layout to coredump file

t cheney <cdmalord@...il.com> writes:

> This patch just add memory layout(same as /proc/pid/maps) to
> coredump file. The layout is appended to corenote segment with
> flag NT_MAPS=7.

Seems like a reasonable idea, but can you please share code with 
the proc implementation? 

It's a bit unusal to have ASCII in a coredump, but I suppose expressing
this in binary would be somewhat ugly.

> +	char *buf = notes->data;
> +	size_t core_limit = notes->datasz;
> +	gate_vma = get_gate_vma(current->mm);
> +

It seems a bit dubious to do this without locking even in a core dump.

> +	for (vma = first_vma(current, gate_vma); vma != NULL;
> +		vma = next_vma(vma, gate_vma)) {
> +		flags = vma->vm_flags;
> +		maps_size += len;
> +		if (file) {
> +			if (maps_size > core_limit)
> +				break;

You have a one-off bug here. Also below.

> +			DUMP_WRITE(buf, len, foffset);
> +		}


-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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