linux-kernel - Re: [PATCH RESEND] Fix race in process_vm_rw

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Date:	Wed, 01 Feb 2012 14:09:51 +0800
From:	Cong Wang <xiyou.wangcong@...il.com>
To:	Christopher Yeoh <cyeoh@....ibm.com>
CC:	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] Fix race in process_vm_rw_core

On 02/01/2012 01:53 PM, Christopher Yeoh wrote:
> +	mm = mm_access(task, PTRACE_MODE_ATTACH);
> +	if (!mm || IS_ERR(mm)) {
> +		if (!mm)
> +			rc = -EINVAL;
> +		else
> +			rc = -EPERM;
>   		goto put_task_struct;

If IS_ERR(mm), you need to return PTR_ERR(mm), rather than -EPERM.

And, is -EINVAL proper for !mm case? For me, -ENOENT is better.
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