Re: bug in generic strncpy_from_user

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On Thu, Feb 28, 2013 at 01:42:16PM +0100, Heiko Carstens wrote:
> On Wed, Feb 27, 2013 at 08:39:20AM -0800, Linus Torvalds wrote:
> > On Wed, Feb 27, 2013 at 3:15 AM, Heiko Carstens
> > <heiko.carstens@xxxxxxxxxx> wrote:
> > >
> > > Tested with 64 bit kernel with 64 bit and 31 bit mode user space as well as
> > > with 31 bit kernel and 31 bit user space. Each with legacy and flexible
> > > mmap layout.
> > > The bug is fixed and everything else still seems to work. Thanks!
> > >
> > > Tested-By: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
> > 
> > Ok, committed.
> > 
> > I'm not marking it for stable, because it doesn't seem to matter all
> > that much, but if there was some application that actually broke and
> > made you notice it that way (as opposed to you just noticing the odd
> > memory map), you might want to inform the stable team about commit
> > 09884964335e.
> 
> It was indeed a bug that caused applications to break.
> So I'd like to see your patch 09884964335e "mm: do not grow the stack
> vma just because of an overrun on preceding vma" in stable (stable team
> added to To: list).

Ok, how far back does the bug go?  Just to 3.8 or earlier?

thanks,

greg k-h
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