Yeah, you'll need to change the PTEs for those pages you created by calling get_user_page() by calling an mprotect like function; perhaps something like:
Thanks. I've incorporated your changes (updated patch attached).
> + /* Move stack pages down in memory. */
> + if (stack_shift) {
> + // FIXME: Verify the shift is OK.
> +
What exactly are you wondering about? the call to move_vma looks sane to
me
My concern was that the binfmt handler may have setup other vm areas which overlap the new range. The move_vma() function doesn't do overlap checking. I'm not sure if this is something I need to guard against, or if it falls in the "Don't do that!" category. Ollie
no_MAX_ARG_PAGES.patch
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