Re: [PATCH v2] ipc/shm: fix the historical/wrong mm->start_stack check

[Cyrill Gorcunov]

On Mon, Aug 25, 2014 at 09:12:07PM +0200, Oleg Nesterov wrote:
> +		vma = find_vma(current->mm, addr);
> +		if (vma) {
> +			unsigned long end = addr + size;
> +
> +			if (vma->vm_flags & VM_GROWSDOWN)
> +				end += PAGE_SIZE * 5;
> +
> +			if (end < addr || end > vma->vm_start)
> +				goto invalid;

Looks good to me, but I somehow missed in first version of the patch
too the following aspect -- end > vma->vm_start? Maybe end >= vma->vm_end?
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