On 03/29/17 13:39, Kees Cook wrote: > This removes ARCH_WANTS_DYNAMIC_TASK_STRUCT from x86, leaving only s390 > still defining this config. > > In order to support future structure layout randomization of the > task_struct, none of the structure fields are allowed to have a specific > position or dynamic size. To enable randomization of task_struct on > x86, the FPU state must be moved to its own dynamically sized cache, > and dereferenced from the task_struct. > > This change is nearly identical to what was done in grsecurity to support > structure layout randomization. Hopefully I found all the needed changes. > This passes allyesconfig, and boot tests. Is this really what we want to happen? It seems much more sane to simply make them adjacent; they don't need to be part of the same structure (in practice, there are three objects: thread_info, task_struct, and the FPU state.) -hpa
