| Date | Sat, 25 Nov 2017 22:40:52 +0100 (CET) | From | Thomas Gleixner <> | Subject | Re: [PATCH 28/43] x86/mm/kaiser: Map cpu entry area |
| |
On Fri, 24 Nov 2017, Ingo Molnar wrote: > +void kaiser_add_mapping_cpu_entry(int cpu) > +{ > + kaiser_add_user_map_early(get_cpu_gdt_ro(cpu), PAGE_SIZE, > + __PAGE_KERNEL_RO); > + > + /* includes the entry stack */ > + kaiser_add_user_map_early(&get_cpu_entry_area(cpu)->tss, > + sizeof(get_cpu_entry_area(cpu)->tss), > + __PAGE_KERNEL | _PAGE_GLOBAL); > + > + /* Entry code, so needs to be EXEC */ > + kaiser_add_user_map_early(&get_cpu_entry_area(cpu)->entry_trampoline, > + sizeof(get_cpu_entry_area(cpu)->entry_trampoline), > + __PAGE_KERNEL_EXEC | _PAGE_GLOBAL);
This creates a RWX mapping and wants to be __PAGE_KERNEL_RX!
Whats weird is that I saw dump_walk_pgd_level_checkwx() complain once about that, but on the next boot it failed to detect it for whatever reason. This needs further investigation.
Thanks,
tglx
|