On Tue, Aug 4, 2020 at 3:19 PM Catalin Marinas <catalin.marinas@xxxxxxx> wrote: > > On Tue, Aug 04, 2020 at 02:41:26PM +0200, Andrey Konovalov wrote: > > This patch prepares Software Tag-Based KASAN for stack tagging support. > > > > With stack tagging enabled, KASAN tags stack variable in each function > > in its prologue. In start_kernel() stack variables get tagged before KASAN > > is enabled via setup_arch()->kasan_init(). As the result the tags for > > start_kernel()'s stack variables end up in the temporary shadow memory. > > Later when KASAN gets enabled, switched to normal shadow, and starts > > checking tags, this leads to false-positive reports, as proper tags are > > missing in normal shadow. > > > > Disable KASAN instrumentation for start_kernel(). Also disable it for > > arm64's setup_arch() as a precaution (it doesn't have any stack variables > > right now). > > > > Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx> > > I thought I acked this already. Either way: > > Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx> Sorry, I forgot to include that into v2. Thanks!
