On Sun, Aug 05, 2007 at 09:03:28PM -0500, Dave Boutcher wrote:
>
> When dumping vma information the pagemap_read routine calculates
> the minimum of what the user asks for and the end of the vma.
> Unfortunately the code uses vma->vm_start rather than vma->vm_end
> which can result in the end address being before the start, and
> a nasty never-ending loop in the kernel.
>
> Diffed against 2.6.23-rc1-mm2
>
> Signed-off-by: Dave Boutcher <[EMAIL PROTECTED]>
Thanks, Dave. I've added this fix to my local tree. It's still in a
broken state at the moment, so Andrew, feel free to pick this up.
Acked-by: Matt Mackall <[EMAIL PROTECTED]>
> ---
> fs/proc/task_mmu.c |2 +-
> 1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index b2baeab..b12740c 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -671,7 +671,7 @@ static ssize_t pagemap_read(struct file *file, char
> __user *buf,
> ret = -EIO;
> goto out_mm;
> }
> - vend = min(vma->vm_start - 1, end - 1) + 1;
> + vend = min(vma->vm_end - 1, end - 1) + 1;
> ret = pagemap_fill(&pm, vend);
> if (ret || !pm.count)
> break;
> --
> 1.4.4.2
>
> -
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