Our x86_64 implementation it also checks whether frame pointer lies within direct mapping zone (0xffff880000000000-ffffc80000000000), as some frames are not in that zone and doesn't have shadow.
On Tue, Jul 22, 2014 at 2:43 PM, Andrey Ryabinin <a.ryabi...@samsung.com> wrote: > On 07/22/14 14:30, Yury Gribov wrote: >>>> It is required for Kernel AddressSanitizer, as the shadow offset is >>>> not known at the compile time, >>> >>> To get shadow offset this patch uses function __asan_get_shadow_ptr. >>> Wouldn't be more effective just to read variable instead of function call? >> >> Depends on how much logic you want to hide there. If it's just "return >> something" than sure >> but if you need some synchronization or complex calculations, accessing >> global would not be enough. >> > > This function just returns some global variable, and I don't think we will > need something more complex in future. > >> -Y >> >
