On Thu, Apr 04, 2019 at 01:51:25AM -0400, Alexandre Ghiti wrote: > - fix the case where stack randomization should not be taken into > account. Hmm. This sounds a bit vague. It might be better if something considered a fix is split out to a separate patch with a good description. > +config ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT > + bool > + help > + This allows to use a set of generic functions to determine mmap base > + address by giving priority to top-down scheme only if the process > + is not in legacy mode (compat task, unlimited stack size or > + sysctl_legacy_va_layout). Given that this is an option that is just selected by other Kconfig options the help text won't ever be shown. I'd just move it into a comment bove the definition. > +#ifdef CONFIG_MMU > +#ifdef CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT I don't think we need the #ifdef CONFIG_MMU here, CONFIG_ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT should only be selected if the MMU is enabled to start with. > +#ifdef CONFIG_ARCH_HAS_ELF_RANDOMIZE > +unsigned long arch_mmap_rnd(void) Now that a bunch of architectures use a version in common code the arch_ prefix is a bit mislead. Probably not worth changing here, but some time in the future it could use a new name.
