On Thu, Mar 30, 2017 at 12:45 PM, Russell King - ARM Linux <[email protected]> wrote: > On Thu, Mar 30, 2017 at 12:38:15PM -0700, Kees Cook wrote: >> Great work! I think this will need some further changes, though, since >> it doesn't look to me like this would pass LKDTM's tests if it was >> built as a module. (This is missing from my ARM attempt too... I >> haven't figured out how to set the domain on the kernel modules...) > > You're not going to be able to do it very easily. The only way I can > think of achieving it would be to split the module area into one > chunk for text, one chunk for write-rare and one chunk for data.
Well, my intention was to just make the entire module area DOMAIN_WR_RARE. It's overly permissive in the sense that non-data changes could be made, but this is already an improvement over either not having this feature at all or x86's version which makes all of RAM writable. -Kees -- Kees Cook Pixel Security
