Re: [PATCH 1/1] kasan: add memory corruption identification for hardware tag-based mode

[Andrey Konovalov]

On Mon, May 31, 2021 at 11:50 AM Marco Elver <elver@xxxxxxxxxx> wrote:
>
> On Sun, May 30, 2021 at 12:47PM +0800, Kuan-Ying Lee wrote:
> > Add memory corruption identification at bug report for hardware tag-based
> > mode. The report shows whether it is "use-after-free" or "out-of-bound"
> > error instead of "invalid-access" error. This will make it easier for
> > programmers to see the memory corruption problem.
> >
> > We extend the slab to store five old free pointer tag and free backtrace,
> > we can check if the tagged address is in the slab record and make a good
> > guess if the object is more like "use-after-free" or "out-of-bound".
> > therefore every slab memory corruption can be identified whether it's
> > "use-after-free" or "out-of-bound".
> >
> > Signed-off-by: Kuan-Ying Lee <kylee0686026@xxxxxxxxx>
>
> On a whole this makes sense because SW_TAGS mode supports this, too.
>
> My main complaints are the copy-paste of the SW_TAGS code.
>
> Does it make sense to refactor per my suggestions below?
>
> This is also a question to KASAN maintainers (Andrey, any preference?).

All of your comments are valid. Thank you, Marco.