On Thu, Jan 15, 2015 at 05:15:43PM -0800, Andrew Morton wrote: > On Thu, 15 Jan 2015 00:51:50 +0100 Rasmus Villemoes > <li...@rasmusvillemoes.dk> wrote: > > > > There are still several flags unused in vma.vm_flags btw. > > > > > > I'm not sure that we can repurpose vm_pgoff (or vm_private_data) for > > > this: a badly behaved thread could make its sp point at a random vma > > > then trick the kernel into scribbling on that vma's vm_proff? > > > > Well, we could still check vm_file for being NULL before writing to > > vm_pgoff/vm_stack_tid. > > Yes, I guess that would work. We'd need to check that nobody else > is already playing similar games with vm_pgoff.
Well, we do use ->vm_pgoff in anonymous VMAs. For rmap in particular -- vma_address(). -- Kirill A. Shutemov -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
