Date: Tue, 14 Dec 2010 17:05:02 +0100
From: Oleg Nesterov <oleg@redhat.com>
To: "Suzuki K. Poulose" <suzuki@in.ibm.com>
Cc: linux-kernel@vger.kernel.org,
        Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>,
        Christoph Hellwig <hch@lst.de>, Masami Hiramatsu <mhiramat@redhat.com>,
        Ananth N Mavinakayanahalli <ananth@in.ibm.com>,
        Daisuke HATAYAMA <d.hatayama@jp.fujitsu.com>,
        Andi Kleen <andi@firstfloor.org>, Roland McGrath <roland@redhat.com>,
        Amerigo Wang <amwang@redhat.com>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
        KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
        Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [Patch 12/21] Check if the process is an ELF executable
Message-ID: <20101214160502.GE11400@redhat.com>
References: <20101214152259.67896960@suzukikp> <20101214154344.5c2b4737@suzukikp>
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On 12/14, Suzuki K. Poulose wrote:
>
> + */
> +static int get_elf_class(struct task_struct *task)
> +{
> +	struct elfhdr hdr;
> +	int ret = 0;
> +
> +	ret = kernel_read(task->mm->exe_file, 0, (char*)&hdr, sizeof(hdr));

->exe_file can be NULL.

Oleg.

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