On 11/22/2017 07:44 AM, Andy Lutomirski wrote: > The cpu_entry_area will contain stacks. Make sure that KASAN has > appropriate shadow mappings for them. > > Cc: Andrey Ryabinin <aryabi...@virtuozzo.com> > Cc: Alexander Potapenko <gli...@google.com> > Cc: Dmitry Vyukov <dvyu...@google.com> > Cc: kasan-...@googlegroups.com > Signed-off-by: Andy Lutomirski <l...@kernel.org> > --- > arch/x86/mm/kasan_init_64.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c > index 99dfed6dfef8..43d376687315 100644 > --- a/arch/x86/mm/kasan_init_64.c > +++ b/arch/x86/mm/kasan_init_64.c > @@ -330,7 +330,14 @@ void __init kasan_init(void) > early_pfn_to_nid(__pa(_stext))); > > kasan_populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_END), > - (void *)KASAN_SHADOW_END); > + kasan_mem_to_shadow((void > *)(__fix_to_virt(FIX_CPU_ENTRY_AREA_BOTTOM)))); > + > + kasan_populate_shadow((unsigned long)kasan_mem_to_shadow((void > *)(__fix_to_virt(FIX_CPU_ENTRY_AREA_BOTTOM))), > + (unsigned long)kasan_mem_to_shadow((void > *)(__fix_to_virt(FIX_CPU_ENTRY_AREA_TOP) + PAGE_SIZE)),
What's '+ PAGE_SIZE' for? > + 0); > + > + kasan_populate_zero_shadow(kasan_mem_to_shadow((void > *)(__fix_to_virt(FIX_CPU_ENTRY_AREA_TOP) + PAGE_SIZE)), > + (void *)KASAN_SHADOW_END); > > load_cr3(init_top_pgt); > __flush_tlb_all(); >
