linux-kernel - Re: [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm

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Date:	Tue, 25 May 2010 13:24:00 +0100
From:	David Howells <dhowells@...hat.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	dhowells@...hat.com, Roland McGrath <roland@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Frysinger <vapier@...too.org>, linux-sh@...r.kernel.org,
	Paul Mundt <lethal@...ux-sh.org>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 1/1] ptrace: PTRACE_GETFDPIC: fix the unsafe usage of child->mm

Oleg Nesterov <oleg@...hat.com> wrote:

> > Like PEEKTEXT and POKETEXT?
> 
> They use access_process_vm().

Which needs to get the mm:

	int access_process_vm(struct task_struct *tsk, unsigned long addr, void *buf, int len, int write)
	{
		struct vm_area_struct *vma;
		struct mm_struct *mm;

		if (addr + len < addr)
			return 0;

		mm = get_task_mm(tsk);
		if (!mm)
			return 0;

David
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