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

[David Howells]

Oleg Nesterov <oleg@xxxxxxxxxx> 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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