On Wed, 2019-09-04 at 10:37 -0400, Qian Cai wrote: > On Wed, 2019-09-04 at 22:16 +0800, Walter Wu wrote: > > On Wed, 2019-09-04 at 15:44 +0200, Andrey Konovalov wrote: > > > On Wed, Sep 4, 2019 at 8:51 AM Walter Wu <walter-zh.wu@xxxxxxxxxxxx> wrote: > > > > +config KASAN_DUMP_PAGE > > > > + bool "Dump the page last stack information" > > > > + depends on KASAN && PAGE_OWNER > > > > + help > > > > + By default, KASAN doesn't record alloc/free stack for page > > > > allocator. > > > > + It is difficult to fix up page use-after-free issue. > > > > + This feature depends on page owner to record the last stack of > > > > page. > > > > + It is very helpful for solving the page use-after-free or out- > > > > of-bound. > > > > > > I'm not sure if we need a separate config for this. Is there any > > > reason to not have this enabled by default? > > > > PAGE_OWNER need some memory usage, it is not allowed to enable by > > default in low RAM device. so I create new feature option and the person > > who wants to use it to enable it. > > Or you can try to look into reducing the memory footprint of PAGE_OWNER to fit > your needs. It does not always need to be that way. Thanks your suggestion. We can try to think what can be slimmed. Thanks. Walter
